Emeryville Civic Center
HVAC Retrofit Options Analysis
April 10, 2024
Prepared by
Adam Williams, PE, Senior Engineer
David Heinzerling, PE, Principal
Taylor Engineers
1080 Marina Village Parkway, Suite 501
Alameda, CA 94501
(510) 749 – 9135
[email protected]
[email protected]
Attachment A
Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
1 Executive Summary
Taylor Engineers has completed a concept design for HVAC upgrades at Emeryville Civic Center and has prepared this report to document our findings.
HVAC equipment and control systems at Emeryville Civic Center have reached the end of their useful life, so replacement is recommended. Operational costs, thermal comfort, operations, and maintenance will be improved by completing an HVAC retrofit.
Three HVAC options were considered as part of this concept design. • Option 1: Like-for-like replacement with a high-efficiency natural gas boiler • Option 2: All-electric heat pump with like-kind heating capacity • Option 3: All-electric heat pump that is “right sized” per Taylor Engineer’s load calculations. Option 3 is evaluated with two sub options (option 3A and option 3B).
Rough order of Magnitude (ROM) HVAC first costs for HVAC upgrade options have been prepared and summarized in paragraph 6, and annual operation costs for HVAC upgrade options have been prepared and summarized in paragraph 7.
Any of the above retrofit options will maintain improved comfort and significantly reduce greenhouse gas emissions at this site. The all-electric options will have the lowest annual greenhouse gas emissions, though they come at a first cost and operational cost premium.
Regardless of the option chosen, we recommend that the equipment be right-sized based on our load calculations and not simply matched to the existing capacities. Oversized equipment will cycle more frequently, which leads to decreased efficiency, decreased control (comfort), and increased wear on the equipment.
Key text is highlighted in yellow and key charts are outlined in yellow. 2 Introduction
The City is interested in retrofitting the HVAC equipment and controls system at the Civic Center building. The current HVAC system design is a VAV AC packaged unit serving VAV hot water reheat terminal boxes, with hot water supplied by a non-condensing natural gas boiler. The boiler and packaged unit are at the end of their lives and require replacement.
Additionally, the City is interested in pursuing a potential conversion to an all-electric building for multiple reasons:
• Reduce greenhouse gas emissions in order to meet state-mandated carbon reduction goals.
• Provide building system resiliency in the event of gas outages or future price increases. • Become closer to net-zero site energy by expanding the existing site photovoltaic system.
Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
• Become a shelter site in the event of natural disasters during the winter (summer cooling is already all-electric)
This report summarizes and expands upon the following linked reports from 2012, 2019, and 2023. Additionally, the following supplemental reports from the current analysis are included as appendices in this report.
• Appendix A: 2024-03-05 - Emeryville HVAC Systems ROM Pricing Narrative • Appendix B: Emeryville HVAC Systems ROM Price report
• Appendix C: 2024-03-05 - Emeryville City Hall - Pre-Design Test and Balance Summary This report aims to develop Rough Order of Magnitude (ROM) pricing for first costs and operational costs to help the City make a decision regarding whether to provide an all-electric HVAC system. Structural and electrical considerations were evaluated in 2023 but were excluded in this report.
3 Existing Systems
The existing HVAC system is served by an existing packaged AC unit that supplies conditioned air to VAV reheat terminal units. Heating hot water is provided by an existing natural gas boiler.
The AC unit and natural gas boiler have reached the end of their recommended useful life, so we recommend replacement. We also recommend replacing the existing control system with a modern HVAC controls and control sequences to provide energy savings and improved facility operations.
Taylor Engineers has refined load calculations prepared in 2023. Based on our calculations, the existing heating and cooling systems appear to be oversized. See below summary of existing capacities (dark bars) compared with our calculation results (light bars) 75 57
0 10
20 30
40 50
60 70
80 Cooling Load (Tons)
Cooling Load Calculation
Comparison
(E) System Load Calculation
830
514
0 100
200
300
400
500
600
700
800
900
Heating Load (kBTU/hr)
Heating Load Calculation
Comparison
(E) System Load Calculation
Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
Cooling load calculations are based on a window solar heat gain coefficient of 0.75 (where 1.0 is clear glass, and 0 is an opaque wall) based on engineering experience. During our CD-level load calculations, we will further research performance data for the existing windows to refine our load calculations. Cooling loads are calculated at the Oakland Design 0.5% summer condition (84°F Dry Bulb / 64°F Coincident Wet Bulb) per Title 24 paragraph 140.4(b)3.
Heating load calculations are based on single-pane glass with a U factor of 1.0, an uninsulated concrete slab floor, and insulated walls and roof per code minimum insulation values at the time of construction. No credits are provided for heat gain from lights, plug loads, and occupants.
Heating loads are calculated at the Oakland median of extremes condition (32°F Dry Bulb) per Title 24 paragraph 140.4(b)3. Taylor Engineers has reviewed existing terminal unit heating capacities and hot water flows through existing pipe. We have determined that flows can generally be increased by ~20% without exceeding our recommended pipe size criteria for acoustically sensitive spaces. For all-electric designs, our ROM cost narrative and concept design is based on increased flows and an upsized secondary pump to prevent the need to replace terminal units or piping.
Taylor Engineers engaged a Test and Balance (TAB) contractor to take readings of existing heating capacities to help resolve discrepancies between our load calculations and reports that heating issues exist with oversized equipment. TAB readings helped validate that heating issues are due to controls issues rather than insufficient capacity. The full TAB report is provided in Appendix C.
4 Base scope retrofit applicable regardless of heating system upgrade.
Our HVAC ROM cost narrative includes the following base scope. See the Appendix A for more information:
• Replace existing Packaged AC Unit
• Controls replacement for VAV boxes and new HVAC equipment • The following add-alternates
o Package unit supply fan array/wall upgrade.
o VAV box hot water pipe trim upgrades
o Add ceiling fans for comfort and destratification.
o Additional supply grilles near the perimeter.
5 Heating retrofit options.
Three heating retrofit options are considered in this report.
5.1 Option 1: Like-for-like replacement
For Option 1, the existing boiler is replaced in-kind, with a high efficiency condensing furnace.
This option will be low-cost and simple but does not provide all-electric heating and may not meet the city’s sustainability and carbon emissions goals.
Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
5.2 Option 2: All-electric 2-pipe heating-only heat pump with like-kind capacity and 160°F hot water supply temperature.
Based on Taylor Engineers review of terminal unit heating capacities and hot water flows, existing heating capacities can be maintained with 160°F hot water supply temperature. We have found an EcoGreen heat pump selection1that can provide 160°F hot water and like-kind heating capacity at 32°F outdoor air conditions, accounting for defrost derates. Air-to-water heat pump options are limited at this temperature resulting in significant additional costs.
Due to the recent refrigerant phaseouts, this equipment is very new/rare, and uses a reciprocating compressor unlike most conventional heat pumps. We haven’t specified or commissioned this unit on any of our jobs, so this equipment is untested by us. This equipment is likely to run into more operational issues than a standard AC unit or heat pump and will likely be more difficult to hire qualified service technicians to work on it. 1 See linked directory of Ecogreen 160°F heat pump selection https://tayloreng.egnyte.com/fl/BvrM0aD8zh
Emeryville Civic Center – HVAC Retrofit Option Study
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5.3 Option 3 – All-electric heat pump sized per Taylor Engineer’s load calculations and 140°F hot water supply temperature.
Option 3 is the same as option 2, except sized per Taylor Engineers load calculations, which allow heat pumps to be selected to provide 140°F hot water supply temperature. 140°F HWST allows for more conventional air-to-water heat pumps to compete and results in a more affordable and efficient all-electric design. Below is product information for the York YMAE, which is the basis of our ROM cost narrative.
The YMAE has variable speed vapor-injected scroll compressors, which improves efficiency and part-load performance compared to most other conventional heat pumps.
Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
As an add-alternate (called option 3B below), the York YMAE can provide simultaneous heating and cooling duty, with a custom AHU (rather than DX AC unit). This design results in some minor efficiency gains, due to the heat recovery and improved AHU controls, and lower equipment costs, since the AC unit compressors are not required. However, option 3B results in additional installation costs, controls complexity, buffer tank, and additional compressor run time (potentially shorter equipment lifespan) given the compressors are running yearround to provide both heating and cooling. 6 ROM first cost results
Western Allied Mechanical has prepared rough order of magnitude costs based on the cost narrative in Appendix A. Western Allied Mechanical’s report is provided in Appendix B. Below are the results:
Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
Base Scope
Option 1
Condensing Boiler $1,335,000
Option 2
160°F HWST Heat Pump $2,189,000
Option 3A
140°F Heat Pump + AC $1,539,000
Option 3B
140°F Heat Recovery Heat
Pump + AHU $1,598,000
Add Alternates
Rooftop Unit Fan Wall
Upgrade $120,000
VAV box HW pipe trim
replacement $30,000
Ceiling Fans for comfort
and destratification $72,000
Extra sidewall grilles for
additional perimeter
airflow
$56,000
Deduct for right-sized
boiler and AC unit ($55,000)
ROM costs are significantly higher than cost estimates gathered in prior feasibility studies. This is in part due to general post-pandemic inflation for most goods and services, but also due to the addition of a controls retrofit scope which was not included in prior cost estimates. 7 Rough order of magnitude (ROM) operational cost results We re-evaluated ROM operational costs based on the following assumptions. • Same load profile used in the 2019 report, which was based on 2017-2018 utility data.
The pandemic has altered the occupancy and overall load profile of the building, so 2017-2018 pre-pandemic load profile is used.
$1,335,000
$2,189,000
$1,539,000 $1,598,000
$1,558,000
$2,467,000
$1,817,000 $1,876,000
-$500,000
$0
$500,000
$1,000,000
$1,500,000
$2,000,000
$2,500,000
$3,000,000
Option 1
Condensing Boiler
Option 2
160°F HWST Heat Pump
Option 3A
140°F Heat Pump + AC
Option 3B
140°F Heat Recovery
Heat Pump + AHU
ROM HVAC Construction Costs ($)
Construction Costs for HVAC Retrofit Options
Base Scope Fan Wall VAV box Trim Ceiling Fans Extra Grilles Credit for right-sizing total Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
• HVAC is 30% of electric consumption based on 2012 California Commercial End Use Survey (see appendix in 2012 report).
• 2024 utility rates shown below2
o Gas Rate = $1.14 / therm
o Winter 2024 Electricity rates as follows
▪ $0.23 / kWH delivery charge plus the following generation charges ▪ $0.17 / kWh winter 2024 off peak rate
▪ $0.20 / kWh winter 2024 peak rate
o Summer 2023 Electricity rates as follows
▪ $0.16 / kWH delivery charge plus the following generation charges ▪ $0.14 / kWh off peak rate
▪ $0.17 / kWh part peak rate
▪ $0.23 / kWh peak rate
Although summer peak rates are typically higher, the recent PG&E rate hikes have resulted in increased winter rates. It is also possible that Emeryville could restructure their PG&E rate to a place with better winter electricity rates to make an all-electric system more cost-effective. PG&E offers different rate structures for electric-buildings. • Equipment efficiency data shown below
o Gas Unit average heating system efficiency as follows ▪ Existing boiler 55%.
3 ▪ New condensing boiler 85%
o Heat Pump annual estimated system efficiency coefficient (kW/kW)4 ▪ EcoGreen heat pump = 2.50
▪ York YMAE = 3.07
o Packaged AC Unit annual estimated Energy Efficiency Ratio (Btu/w) ▪ Existing = 12 Btu/w5
▪ New AC Unit = 17.4 Btu/w
▪ New AHU + Heat Recovery Chiller = 18.1 Btu/w
• HVAC controls energy savings
o We estimate a 50% HVAC energy savings upon replacement of HVAC controls. 2 Results are based on current rates, which are currently fluctuating. Future rates are unknown and may significantly change the cost effectiveness over the life of the HVAC equipment, especially as gas equipment is phased out, which may result in higher gas rates due to reduced supply or customers paying for gas infrastructure maintenance.
3 Although the existing boiler nameplate AFUE is greater than 60%, we are selecting 60% as a realistic efficiency based on experience with oversized non-condensing boilers. 4 Heat Pump COPs are based a weighted average of manufacturer performance data at the following conditions: 100% Load 32°F OAT for 10% of runtime, 100% Load 45°F OAT for 30% of runtime, and 50% Load 65°F OAT for 60% of runtime.
5 Although nameplate efficiency might be greater than 12 BTU/w, we are selecting 12 as a realistic efficiency based on experience.
Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
o See our California Energy Commission Best in Class study showing multiple example buildings where HVAC energy consumption has been reduced by 50- 60% after upgrading terminal units to dual-maximum control with low minimum airflow rates, and incorporation demand based resets of rooftop equipment setpoints. See link to our project brief6, and our BAS Best Practices Guide7 ROM Operational costs are summarized below:
• All retrofit options will reduce operational costs by 15-30% due to new efficient equipment and controls systems.
• All electric options show a ~15% increased operational cost compared to a gas boiler replacement, but still lower operational cost than the existing system. Operational costs may be able to be lowered by changing the City’s utility rate structure to a plan with lower winter electric rates.
6 See https://tayloreng.egnyte.com/dl/fzlRmpRUWI/CEC_Best_in_Class_-_Project_Brief.pdf_ 7 See https://tayloreng.egnyte.com/dl/phXTDfFQb8/2022-06-13_BAS_Best_Practices_Guide_v1.0.pdf_ Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
8 Recommendations
Any of the above retrofit options will maintain improved comfort and significantly reduce greenhouse gas emissions at this site. The all-electric options will have the lowest annual greenhouse gas emissions, though they come at a first cost and operational cost premium.
For the all-electric options, we strongly recommend against option 2 and recommend either 3A or 3B. The determination of which one (3A or 3B) is optimal from a first cost, energy cost, and lifecycle cost is within the noise of this ROM level analysis. The decision mainly comes down to “soft” advantages and disadvantages described in section 5.3, and/or structural implications that are beyond this ROM study’s scope. The choice of 3A vs 3B can be deferred to later stages of design and discussed with all parties to come to the best solution for all stakeholders.
Regardless of the option chosen, we recommend that the equipment be right-sized based on our load calculations and not simply matched to the existing capacities. Oversized equipment will cycle more frequently, which leads to decreased efficiency, decreased control (comfort), and increased wear on the equipment.
$86,000 $86,000 $86,000 $86,000 $86,000
$37,000
$13,000 $13,000 $13,000 $12,000
$26,000 $22,000 $22,000
$24,000
$8,000
$146,000
$106,000
$125,000 $120,000 $119,000
$0
$20,000
$40,000
$60,000
$80,000
$100,000
$120,000
$140,000
$160,000
Existing System Option 1
Condensing Boiler
Option 2
160°F HWST Heat
Pump
Option 3A
140°F Heat Pump +
AC
Option 3B
140°F Heat
Recovery Heat Pump
+ AHU
ROM Energy Cost ($/year)
Annual ROM Energy Costs For Proposed HVAC Upgrades
Non HVAC Electricity Cooling + Ventilation Electricity Heating Electricity Heating Gas Total Energy Cost Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
Appendix A: ROM Pricing Narrative
Emeryville Civic Center – HVAC Concept Design Report
April 4, 2024
Appendix A: ROM Pricing Narrative
City of Emeryville – Civic Center HVAC System Options ROM Pricing Narrative 3/5/2024
230000 - 1
SECTION 230000 - HVAC SYSTEMS
PART 1 GENERAL
1.1 SYSTEM OPTION SUMMARY
A. Existing HVAC Systems, including the packaged rooftop AC unit, heating plant, and control system, are due for replacement.
B. Three heating plant options are being evaluated for first cost as part of this exercise:
1. Like-for-like replacement with a gas boiler.
2. All-electric 2-pipe heating-only heat pump with like-kind capacity and 160°F hot water supply temperature.
3. All-electric 2-pipe heating-only heat pump sized per Taylor Engineer’s load calculations and 140°F hot water supply temperature.
C. This document is intended to provide sufficient information for rough order of magnitude (ROM) HVAC pricing to develop a project budget, not for exact, definitive, pricing.
D. Interior scope will be completed during normal business hours. Rooftop scope will be completed during weekend(s) to minimize disruption to HVAC service during normal hours. A crane can be placed in the parking lot to avoid road closures.
City of Emeryville – Civic Center HVAC System Options ROM Pricing Narrative 3/5/2024
230000 - 2
1.2 BASE SCOPE APPLICABLE TO ALL SYSTEMS
A. Replace the existing package AC unit with the following:
1. 75 tons, 2.5” ESP, 24,000 cfm, 460V
2. Economizer with relief fan (1.25” ESP, 21,000 cfm)
3. Epoxy coated evaporator and condenser coil fins
4. 316 SS low-leak dampers
5. Controls BACnet gateway
6. Outdoor air airflow measurement station
7. 5500-hour ASTM salt-spray coating
8. Base scope is 2 supply fans to provide partial redundancy.
9. Based around Trane (SXHMF7540*66DVLE8C01A0WU0VJ0A*0RW1M8G0).
10. As an Add-Alternate: upgrade to a fan array with 4 or more supply fans.
The existing package unit may be slightly larger than the existing unit. Trane offers an Intellipak Replacement Unit (IRU) selection that is designed to be cantilevered over an existing roof curb to reduce structural costs. Structural evaluation will be required since the replacement unit is ~1300 lbs heavier than the existing unit, but structural upgrades are unlikely. The existing mechanical screen should not require replacement with this Trane selection. See sketch below:
B. Provide the following scope for each of the (30) existing VAV reheat terminal units:
1. Replace the existing VAV box controller with a new controller.
2. Replace the existing hot water valve and valve actuator.
3. Include a new discharge air temperature sensor.
4. Replace the existing Delta thermostat with a new thermostat.
5. As an Add-Alternate: Replace the existing hot water coil trim with new trim per the below diagram.
City of Emeryville – Civic Center HVAC System Options ROM Pricing Narrative 3/5/2024
230000 - 3
C. Add-Alternate: Provide (2) new destratification fans Air Pear 25-EC-Standard with 0- 10V DC control from the building automation system. Provide (6) new ceiling fans Big Ass Fan ES6 84 inch or equal in single-height areas with occupant adjustable wall switch for improved comfort. See linked floor plans with proposed ceiling fan locations.
D. Add-Alternate: Provide 16”x16” supply duct plenums with a manual volume damper and a new 14”x14” sidewall grill directed down and towards the windows on the North and East façade. Typical of 7 supply ducts on ground level and 7 supply ducts on level
2. See linked floor plans with proposed sidewall grille locations.
E. Replace the existing Delta Controls System with new DDC controls (Johnson Controls Facility Explorer, Alerton, or Distech) for the following equipment.
1. (30) existing VAV reheat terminal units with new controllers and new valve actuators
2. (6) existing constant speed rooftop exhaust fans
3. (1) new packaged AC unit.
4. (1) new heating plant, including DP sensors for variable primary flow control Provide new sequences of operation following ASHRAE Guideline 36.
F. Include TAB services to rebalance all affected systems. Terminal unit balancing of variable flow hydronic systems is not required.
1.3 HEATING PLANT OPTIONS
A. Option 1 – Like-for-like replacement with a gas boiler.
1. One high efficiency condensing boiler, 830 MBH output capacity. a. AERCO Benchmark 1000
b. Cleaver-Brooks ClearFire-CE 1000
c. Lochinvar Crest 1000
d. Or equal
City of Emeryville – Civic Center HVAC System Options ROM Pricing Narrative 3/5/2024
230000 - 4
2. One constant speed HW pump, 55 gpm, 45’ head, 460V, 2 HP
3. Reuse existing expansion tank and air separator, but replace existing ancillary devices like the pot feeder and make-up water valve.
4. HW distribution shall be primary-only with a minimum flow bypass.
The option 1 hot water plant will fit in the existing footprint.
B. Option 2 – All-electric 2-pipe heat pump with like-kind capacity and 160°F hot water supply temperature.
1. Ecogreen Heat Pump model ECCLA-HPR150A or equal (no known equal at a competitive price point)
a. 2-pipe, heating only
b. 830 kBTU/hr, 160°F HWST at 32°F outdoor air temperature
2. Provide a 900 gallon HW buffer tank
3. One constant speed primary HW pump, 150 GPM, 10’ head, 460V, 2 HP, either standalone or factory provided.
4. One variable speed secondary HW pump, 75 GPM, 80’ head, 5 HP.
Option 2 will require a new structural platform and a new equipment screen, since the heat pump and pumps will exceed the footprint of the existing plant. See sketch below of proposed layout
C. Option 3 – All-electric 2-pipe heat pump sized per Taylor Engineer’s load calculations and 140°F hot water supply temperature.
1. York YMAE 0070 or equal
a. 2-pipe, heating only
b. 550 kBTU/hr, 140°F HWST at 32°F outdoor air temperature.
City of Emeryville – Civic Center HVAC System Options ROM Pricing Narrative 3/5/2024
230000 - 5
2. Provide a 450 gallon HW buffer tank
3. One variable speed HW pump, 75 GPM, 80’ head, 5 HP.
Option 3 will require a new structural platform and a new equipment screen, since the heat pump and pumps will exceed the footprint of the existing plant. See sketch below of proposed layout.
Add-Alternate: Upgrade the York YMAE to provide both heating and cooling by including the following:
a. York YMAE - 4-pipe, heating and cooling heat recovery b. 70-ton nominal cooling capacity at AHRI conditions.
c. Provide an air-handling unit instead of the base scope AC unit specified in
1.2A.
d. Add one 450 gallon CHW buffer tank.
e. Add one constant speed CHW pump, 85 GPM, 15’ head, 460V, 2 HP, either standalone or factory provided. Capacity control will be handled via water temperature setpoint reset.
f. 2-1/2” chilled water pipe from the heat pump to the AHU as shown below. g. Associated additional sequences of operation/controls
END OF SECTION
Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
Appendix B: Emeryville HVAC Systems ROM Price report
33210 Central Avenue ∙ Union City, CA www.westernallied.com 650-326-0750 ∙ License No. 826782
BUDGET PROPOSAL (rev1)
Date: April 3, 2024
To: Taylor Engineers
Attn: Adam Williams
Project: Emeryville Civic Center - Electrification
Dear Adam:
Western Allied Mechanical is pleased to provide a Budget proposal for the heating, ventilating, and air conditioning work at the Emeryville Civic Center. This proposal is based upon the Emeryville HVAC Systems ROM Pricing Narrative dated 3/5/2024 as prepared by Taylor Engineers.
PRICING BREAKDOWN:
Option 1a: AC Unit, VAV control valves, BMS, TAB, Gas Boiler $1,335,000 • Equipment
• Labor, Materials, Misc.
• Controls
$480,000
$627,000
$228,000
Option 1b: Smaller AC Unit, VAV control valves, BMS, TAB, Smaller Gas Boiler $1,280,000 • Equipment
• Labor, Materials, Misc.
• Controls
$425,000
$627,000
$228,000
Option 2: AC Unit, VAV control valves, BMS, TAB, EcoGreen 2-pipe ASHP $2,189,000 • Equipment
• Labor, Materials, Misc.
• Controls
$1,186,000
$761,000
$242,000
Option 3: AC Unit, VAV control valves, BMS, TAB, York 2-pipe ASHP $1,539,000 • Equipment
• Labor, Materials, Misc.
• Controls
$601,000
$701,000
$237,000
Option 4: AHU, VAV control valves, BMS, TAB, York 4-pipe ASHP $1,598,000 • Equipment
• Labor, Materials, Misc.
• Controls
$426,000
$907,000
$265,000
Alternate 1: AC Unit Fan Wall ADD $120,000
Alternate 2: VAV Box Trim Replacement ADD $30,000
Alternate 3: Air Pear & BAFs ADD $112,000
Alternate 4: Duct Plenums & GRDs ADD $56,000
33210 Central Avenue ∙ Union City, CA www.westernallied.com 650-326-0750 ∙ License No. 826782
OPTION 1a:
Specific Inclusions:
1. New Equipment (Furnished and Installed):
A. (1) 75-ton Trane cooling only rooftop AC Unit
B. (1) 1000MBH Aerco condensing natural gas boiler
C. (1) 55gpm constant speed HHW pump
2. Demolition Services:
A. Existing rooftop package unit
B. Existing boiler
3. Piping Work:
A. Re-pipe HHW piping on roof to create primary only configuration and tie into existing distribution.
B. Replace (30) existing VAV box control valves with new.
4. Sheet Metal and Duct Work:
A. Disconnect and reconnect existing supply and return ductwork from rooftop AC Unit
5. Crane and Rigging Services:
A. Receiving, storing, hauling, and lifting new equipment.
B. Lifting, hauling, and disposal of old equipment.
6. Insulation:
A. All new and disturbed ductwork and HHW piping shall be insulated per Title-24 requirements.
7. Controls:
A. Tie in new controls into new Alerton Server
B. Provide and configure new Alerton Global Controller
C. Develop graphics, provide engineering, coordinate/participate in design/sequence review meetings, and provide start-up.
D. Up to (8) hours of Training included
E. Up to (8) hours of Vx assistance included
F. Up to (8) hours of TAB assistance included
G. DDC Control of the following equipment:
i. (1) Trane Package Unit
a. BACnet Integration
b. AFMS
ii. Central Heating Plant
a. (1) Gas boiler
b. (1) Constant Speed HHW Pump
iii. (30) VAV with Reheat
a. HW Valve
b. Actuator
c. SAT Sensor
33210 Central Avenue ∙ Union City, CA www.westernallied.com 650-326-0750 ∙ License No. 826782
d. Thermostat
iv. (6) Exhaust Fans
a. Start/Stop
b. Status
8. Commissioning Services:
A. Startup of new equipment.
B. Testing, adjusting, and balancing.
C. Labeling of new equipment.
9. Miscellaneous:
A. State taxes.
B. One year warranty on all new equipment, materials, and labor.
C. OT as required for all roof work.
OPTION 1b:
Specific Inclusions:
1. New Equipment (Furnished and Installed):
A. (1) 60-ton Trane cooling only rooftop AC Unit
B. (1) 750MBH Aerco condensing natural gas boiler
C. (1) 55gpm constant speed HHW pump
2. Demolition Services:
A. Existing rooftop package unit
B. Existing boiler
3. Piping Work:
A. Re-pipe HHW piping on roof to create primary only configuration and tie into existing distribution.
B. Replace (30) existing VAV box control valves with new.
4. Sheet Metal and Duct Work:
A. Disconnect and reconnect existing supply and return ductwork from rooftop AC Unit
5. Crane and Rigging Services:
A. Receiving, storing, hauling, and lifting new equipment.
B. Lifting, hauling, and disposal of old equipment.
6. Insulation:
A. All new and disturbed ductwork and HHW piping shall be insulated per Title-24 requirements.
7. Controls:
A. Tie in new controls into new Alerton Server
B. Provide and configure new Alerton Global Controller
33210 Central Avenue ∙ Union City, CA www.westernallied.com 650-326-0750 ∙ License No. 826782
C. Develop graphics, provide engineering, coordinate/participate in design/sequence review meetings, and provide start-up.
D. Up to (8) hours of Training included
E. Up to (8) hours of Vx assistance included
F. Up to (8) hours of TAB assistance included
G. DDC Control of the following equipment:
i. (1) Trane Package Unit
a. BACnet Integration
b. AFMS
ii. Central Heating Plant
a. (1) Gas boiler
b. (1) Constant Speed HHW Pump
iii. (30) VAV with Reheat
a. HW Valve
b. Actuator
c. SAT Sensor
d. Thermostat
iv. (6) Exhaust Fans
a. Start/Stop
b. Status
8. Commissioning Services:
A. Startup of new equipment.
B. Testing, adjusting, and balancing.
C. Labeling of new equipment.
9. Miscellaneous:
A. State taxes.
B. One year warranty on all new equipment, materials, and labor.
C. OT as required for all roof work.
OPTION 2:
Specific Inclusions:
1. New Equipment (Furnished and Installed):
A. (1) 75-ton Trane cooling only rooftop AC Unit
B. (1) EcoGreen ECCLA-HPR150A 2-pipe Air Source Heat Pump C. (2) HHW pumps
i. (1) 150gpm constant speed primary
ii. (1) 75gpm variable speed secondary
D. (1) 5hp VFD for HHW pump
E. (1) 900gallon Storage Tank
2. Demolition Services:
A. Existing rooftop package unit
B. Existing boiler
33210 Central Avenue ∙ Union City, CA www.westernallied.com 650-326-0750 ∙ License No. 826782
3. Piping Work:
A. Re-pipe HHW piping on roof to create primary/secondary configuration and tie into existing distribution.
B. Replace (30) existing VAV box control valves with new.
4. Sheet Metal and Duct Work:
A. Disconnect and reconnect existing supply and return ductwork from rooftop AC Unit
5. Crane and Rigging Services:
A. Receiving, storing, hauling, and lifting new equipment.
B. Lifting, hauling, and disposal of old equipment.
6. Insulation:
A. All new and disturbed ductwork and HHW piping shall be insulated per Title-24 requirements.
7. Controls:
A. Tie in new controls into new Alerton Server
B. Provide and configure new Alerton Global Controller
C. Develop graphics, provide engineering, coordinate/participate in design/sequence review meetings, and provide start-up.
D. Up to (8) hours of Training included
E. Up to (8) hours of Vx assistance included
F. Up to (8) hours of TAB assistance included
G. DDC Control of the following equipment:
i. (1) Trane Package Unit
a. BACnet Integration
b. AFMS
ii. Central Heating Plant
a. (1) Heat Pump Unit
b. (1) Constant Speed HHW Pump
c. (1) Variable Speed HHW Pump
iii. (30) VAV with Reheat
a. HW Valve
b. Actuator
c. SAT Sensor
d. Thermostat
iv. (6) Exhaust Fans
a. Start/Stop
b. Status
8. Commissioning Services:
A. Startup of new equipment.
B. Testing, adjusting, and balancing.
C. Labeling of new equipment.
33210 Central Avenue ∙ Union City, CA www.westernallied.com 650-326-0750 ∙ License No. 826782
9. Miscellaneous:
A. State taxes.
B. One year warranty on all new equipment, materials, and labor.
C. OT as required for all roof work.
OPTION 3:
Specific Inclusions:
1. New Equipment (Furnished and Installed):
A. (1) 75-ton Trane cooling only rooftop AC Unit
B. (1) York YMAE 0070 2-pipe Air Source Heat Pump
C. (1) HHW pump
i. (1) 75gpm variable speed primary
D. (1) 5hp VFD for HHW pump
E. (1) 450gallon Storage Tank
2. Demolition Services:
A. Existing rooftop package unit
B. Existing boiler
3. Piping Work:
A. Re-pipe HHW piping on roof to create primary only configuration and tie into existing distribution.
B. Replace (30) existing VAV box control valves with new.
4. Sheet Metal and Duct Work:
A. Disconnect and reconnect existing supply and return ductwork from rooftop AC Unit
5. Crane and Rigging Services:
A. Receiving, storing, hauling, and lifting new equipment.
B. Lifting, hauling, and disposal of old equipment.
6. Insulation:
A. All new and disturbed ductwork and HHW piping shall be insulated per Title-24 requirements.
7. Controls:
A. Tie in new controls into new Alerton Server
B. Provide and configure new Alerton Global Controller
C. Develop graphics, provide engineering, coordinate/participate in design/sequence review meetings, and provide start-up.
D. Up to (8) hours of Training included
E. Up to (8) hours of Vx assistance included
F. Up to (8) hours of TAB assistance included
G. DDC Control of the following equipment:
i. (1) Trane Package Unit
33210 Central Avenue ∙ Union City, CA www.westernallied.com 650-326-0750 ∙ License No. 826782
a. BACnet Integration
b. AFMS
ii. Central Heating Plant
a. (1) Heat Pump Unit
b. (1) Variable Speed HHW Pump
iii. (30) VAV with Reheat
a. HW Valve
b. Actuator
c. SAT Sensor
d. Thermostat
iv. (6) Exhaust Fans
a. Start/Stop
b. Status
8. Commissioning Services:
A. Startup of new equipment.
B. Testing, adjusting, and balancing.
C. Labeling of new equipment.
9. Miscellaneous:
A. State taxes.
B. One year warranty on all new equipment, materials, and labor.
C. OT as required for all roof work.
OPTION 4:
Specific Inclusions:
1. New Equipment (Furnished and Installed):
A. (1) 75-ton Petra Air Handling Unit
B. (1) York YMAE 70-ton 4-pipe Air Source Heat Pump
C. (1) HHW pump
i. (1) 75gpm variable speed primary
D. (1) CHW pump
i. (1) 85gpm constant speed primary
E. (1) 5hp VFD for HHW pump
F. (2) 450gallon Storage Tanks
2. Demolition Services:
A. Existing rooftop package unit
B. Existing boiler
3. Piping Work:
A. Re-pipe HHW piping on roof to create primary only configuration and tie into existing distribution.
B. New CHW piping on roof to feed AHU
C. Replace (30) existing VAV box control valves with new. 33210 Central Avenue ∙ Union City, CA www.westernallied.com 650-326-0750 ∙ License No. 826782
4. Sheet Metal and Duct Work:
A. Disconnect and reconnect existing supply and return ductwork from rooftop AC Unit
5. Crane and Rigging Services:
A. Receiving, storing, hauling, and lifting new equipment.
B. Lifting, hauling, and disposal of old equipment.
6. Insulation:
A. All new and disturbed ductwork and HHW piping shall be insulated per Title-24 requirements.
7. Controls:
A. Tie in new controls into new Alerton Server
B. Provide and configure new Alerton Global Controller
C. Develop graphics, provide engineering, coordinate/participate in design/sequence review meetings, and provide start-up.
D. Up to (8) hours of Training included
E. Up to (8) hours of Vx assistance included
F. Up to (8) hours of TAB assistance included
G. DDC Control of the following equipment:
i. (1) Trane Package Unit
a. BACnet Integration
b. AFMS
ii. Central Heating/Cooling Plant
a. (1) Heat Recovery 4-pipe Unit
b. (1) Variable Speed HHW Pump
c. (1) Constant Speed CHW Pump
iii. (30) VAV with Reheat
a. HW Valve
b. Actuator
c. SAT Sensor
d. Thermostat
iv. (6) Exhaust Fans
a. Start/Stop
b. Status
8. Commissioning Services:
A. Startup of new equipment.
B. Testing, adjusting, and balancing.
C. Labeling of new equipment.
9. Miscellaneous:
A. State taxes.
B. One year warranty on all new equipment, materials, and labor.
C. OT as required for all roof work.
33210 Central Avenue ∙ Union City, CA www.westernallied.com 650-326-0750 ∙ License No. 826782
ALTERNATE 1 Scope of Work:
• Add pricing to furnish and install rooftop AC unit with Fan Wall type configuration in lieu of standard fan configuration.
ALTERNATE 2 Scope of Work:
• Replace (30) VAV box coil trims, in addition to the included control valve replacement.
ALTERNATE 3 Scope of Work:
• Furnish and install (2) Air Pear Destratification Fans and (6) Big Ass Fan ceiling fans, including DDC controls
ALTERNATE 4 Scope of Work:
• Furnish and install (14) 16”x16” supply duct plenums with manual dampers and 14”x14” sidewall grilles.
Specific Exclusions:
A. All structural upgrade engineering and/or support work as required to accommodate mechanical equipment including all steel or wood air conditioning supports.
B. Survey, repairs, and/or modifications of existing HVAC system other than those specifically included.
C. All work associated with hazardous materials (lead, asbestos, etc.).
D. All electrical upgrade work including power and 120 volt wiring, conduit, disconnect switches, motor starters, interlock wiring of smoke/fire dampers, smoke detectors and smoke detector wiring.
E. All plumbing upgrade work including gas, make-up water, rooftop sanitary connection and condensate piping.
F. Excluded are cash discounts in exchange for quick payment, regardless of pre bid documents, unless specifically agreed to in writing by Western Allied.
G. Furnishing or installing of FLS devices.
Western Allied Mechanical appreciates the opportunity to present this proposal and looks forward to working with you on this project.
Should you have any questions, or if I can be of further assistance, please feel free to call.
Sincerely,
Eddie Patterson, LEED AP
Estimating Manager
33210 Central Avenue ∙ Union City, CA www.westernallied.com 650-326-0750 ∙ License No. 826782
Note: This price is valid for 30 days from date of issuance. Should this proposal expire, a revised proposal can be provided upon request.
Emeryville Civic Center – HVAC Retrofit Option Study
April 10, 2024
Appendix C: Pre-Design Test and Balance Summary
To: Ali Ahmadzadeh
From: Adam Williams
Subject: Emeryville City Hall - Pre-Design Test and Balance Summary Date: March 5 2024
Taylor Engineering has completed pre-deign measurements with a Test and Balance (TAB) contractor to help understand the existing system and current operating conditions as part of our all-electric concept design scope.
Below is an executive summary of key takeaways from the TAB work. An executive summary of findings is provided below:
• Although the existing boiler was set to provide 180°F hot water supply temperature, only 160°F hot water supply temperature is being provided, most likely due to boiler control issues. • We suspect that all terminal units on the second floor have controls issues which significantly reduce their design heating capacity.
• The terminal units operate with high minimum airflow setpoints which increase the likelihood of overcooling if zone heating is disabled or fails.
• At least 1 terminal unit’s heating is disabled due to existing hot water pipe leakage, which contributes to heating complaints in that space.
• The building can typically warm up in 40 minutes when the systems are functioning normally, which indicates that the heating system may be oversized.
• Comfort complaints reported to the chief facility engineer have been caused by failed equipment, rather than insufficient heating capacity.
• We did not measure significant amounts of air temperature stratification, but the supply air temperature coming off of the coils greatly exceeds recommended temperatures to prevent stratification. • The single pane glass makes a measurable temperature difference between perimeter and interior spaces, which may still result in some comfort issues now and after the HVAC upgrades.
Below is a detailed description of the measurement activities and findings, with key points highlighted in yellow.
The preliminary TAB report prepared by RSA is also included. 1) Although the existing boiler was set to provide 180°F hot water supply temperature, only 155°F to 165°F hot water is being supplied to the building. Primary supply temperature was verified with existing temperature gauges, and secondary hot water supply temperature was verified by the TAB contractor using a test port. The discrepancy between the setpoint and output temperature is most likely due to calibration issues with the existing boiler controls. Presumably, ~160°F hot water has been provided to this building all winter without issue. This evidence likely means that 160°F hot water can meet system loads without any piping modifications, which aligns with our load calculations and engineering experience.
Emeryville City Hall - Pre-Design Test and Balance Summary | March 2024 2 2) TAB work was very difficult due to issues with the existing building automation system (BAS). For example, all of the terminal units on level 2 were unable to be monitored or adjusted by the BAS, and the level 2 terminal unit that was measured (TUR30) did not function properly. TUR30’s hot water valve opened, then shut regardless of zone temperature and setpoint adjustment, resulting in ineffective heating. We presume this situation is happening on all level 2 terminal units, and this operation contributes to heating difficulties in this building. The terminal units on level 1 did appear to function properly, but the BAS was not able to control these units or provide much monitoring. Our recommendation is to replace the BAS entirely due to age. 3) The terminal units are operating with single-max airflow setpoints (high minimum airflow), where the airflow never falls below the airflow required to meet the heating load. These airflow setpoints are very inefficient, and not compliant with current code. These setpoints also significantly increase the likelihood of overcooling spaces if the zone heating fails or is disabled such as in item 4) below. New airflow setpoints will be determined as part of the design work and will help reduce the likelihood of heating issues.
Emeryville City Hall - Pre-Design Test and Balance Summary | March 2024 3 4) Two of the terminal units have leaking hot water pipe at the bottom of the heating coil. One does not leak significantly enough to require being disabled. The other terminal units has its hot water valve disabled to prevent water leakage, which disables heating. The lack of heat is exasperated by issue 3) above. As a temporary measure, consider lowering the minimum airflow setpoint to 5) Based on the TAB work that could be completed, we believe the terminal units tend to provide design heating capacity, although some coils may be receiving excessive hot water flow and high leaving air temperatures. The high water flows may be false readings because the existing calibrated balance valves, may be out of calibration due to sediment buildup in the valve. 6) Per discussion with the facility engineer, Kevin Meixner, below are takeaways based on his experience in the last 3-4 months of operation:
a. The HVAC system runs Monday-Friday from 6AM to 6PM, with a goal of maintaining setpoints by 7:30, so a 1.5 hour warmup period. Per accounts form Kevin, the building typically warms up in ~40 minutes on most mild-winter mornings. Warmup can take longer on very cold winter mornings. Typical warmup times on design heating are 2-3 hours on modern systems, and modern systems automatically adjust the warmup duration based on each evening’s outdoor air conditions using a machine-leaning approach.
b. Comfort complaints received by Kevin have always been due to failed equipment, typically the AC unit supply fan, which has tripped due to ground faults at the VFD on multiple occasions and stopped providing air to the space. It is possible that less minor comfort complaints may existing but have not been communicated to Kevin since the building has had comfort problems for several years and occupants may be “given up” on relaying these c. Comfort complaints aren’t focused on a specific location, unless there’s a zone terminal unit failure. Temperature complaints are typically building-wide due to AHU or boiler issues.
Emeryville City Hall - Pre-Design Test and Balance Summary | March 2024 4 d. The boiler was set to 140°F HWST setpoint, and probably supplying even colder water as noted in issue 1), when Kevin joined. The setting was changed to 180°F HWST setpoint and actually provides 160°F hot water per issue 1).
7) Room air stratification was measured around 11:00AM when outdoor air temperature was ~54°F. During that testing, stratification was only ~2°F from the ground on level 1 to the ceiling of level 2. This stratification was less than expected, possibly due to a number of factors a. Outdoor air was more mild at the time of testing
b. Heating on level 2 was reduced/ineffective due to controls issues.
We still recommend considering adding ceiling fans for destratification and comfort reasons. Ceiling fans also provide an extra level of resiliency by reducing warmup times, as well as making spaces more comfortable on hot days or if mechanical cooling is unavailable. 8) Along with that testing, there was an ~2°F temperature differential between perimeter and interior zones at 54°F outdoor air temperature. We estimate at winter design outdoor air conditions (~32°F outdoor air temperature), the temperature differential could be as high as 5°F resulting in comfort complaints for occupants sitting next to the single-pane glass. Comfort issues like this cannot be remedied by simply a like-kind unit replacement. Recommendations could be as follows:
• Re-organize office layouts so circulation areas and/or communal areas are along the windows. • Provide or allow personal comfort enhancements (personal fans or heaters) • Replace or retrofit the existing single-pane glass.
• Add sidewall diffusers to the end of zone round branch ductwork that faces the glazing. This would require rebalancing all diffusers in each zone this solution is applied to. 9) The building also contains operable windows, which increase heating loads if the windows are not shut on cold days. Building operations and/or janitorial services should ensure that windows are closed at the end of each day..
Preliminary Report
EMERYVILLE CITY HALL
PRE-DESIGN SURVEY
DATE: 2/27/2024
TECHNICIAN: MICHAEL SANDEN
TBE: JOEL JOHNSON
1035 Suncast Ln. Ste. 130 El Dorado Hills, CA 95762 Office 916.358.5672
Project Summary
Date: 2/27/2024
Project: Emeryville City Hall Pre-Design Survey
Job Number: TBD
Technician: Mike Sanden
Scope of Work
Pre-design survey the existing HVAC system as requested and directed by client.
Observations & Outcomes
• All systems tested at the direction and witnessed by mechanical engineer of record (Taylor Engineering).
• All HVAC VAV’s are a Delta DDC type with single inlet and reheat coils at terminal units. All systems tested in “AS FOUND” mode with systems in heating mode of operation. VAVs put into heating mode by others.
• 2nd floor VAVs not communicating with the BMS system at time of testing. When RSA attempted to test the 2nd floor VAV the reheat actuator would open and then close again with t-stat set above or below the room zone temperature seen on the t-stat. RSA recommends controls system be inspected and re-established to control VAVs. • RSA found clogged test ports and were informed of multiple leaks in HHW piping requiring zones to be shut off.
• Stratification location #1 on 1st Floor at 6’ = 70.5 degrees, 10.5’ = 70.6 degrees, 16’=
71.3 degrees.
• Stratification location #2 on 2nd Floor at 6’ = 71.2 degrees, 10.5’ = 71.2 degrees, 16’=72.3 degrees.
• Stratification location #3 on 2nd Floor at 6’ = 71.4 degrees, 10.5’ = 71.4 degrees, 16’=
71.8 degrees.
In our efforts to constantly improve in all aspects of our performance, we would appreciate any feedback, positive or negative, regarding your experience with the RSA team.
Please click the link below to be directed to our Quality Assurance Survey. Thank you! RSA Quality Assurance
PRELIMINARY
Remarks
Remarks
Leaving Water Temp
GPM
DNL
DNL
Service HHW
Leaving Water Temp DNA Entering Water Pressure DNA
Area Served Location
Low Fire Safety Relief Valve
GPM
Input MBH
Output MBH DNL
Entering Water Temp DNL
Boiler Data Design Data
Area Served HHW Location Roof
Equipment I.D.
Manufacture
DNL
DNL
Model DNL
DNL
Test Data
Entering Water Temp
High Fire Leaving Water Pressure
Service Leaving Water Temp
GPM
Manufacture
Outside Air Temp D.B.
Leaving Water Temp
High Fire 180 Leaving Water Pressure DNA
GPM DNA MBH Output
Entering Water Pressure
Secondary discharge temperature 160.5 degrees
(1) No test ports installed.
Date
Boiler Data Design Data
Equipment I.D. Input MBH
BOILER TEST SHEET
Date 27-Feb-24
Test Data
DNA
Low Fire 165 Safety Relief Valve 60 psi
Entering Water Temp DNA Outside Air Temp D.B. 50.0
Model Entering Water Temp
Output MBH
BOILER TEST SHEET
MBH Output
(1)
(1)
(1)
(1)
(1)
PRELIMINARY
Design Tested Pressure
27-Feb-24 Pump Identification Secondary Pump System Type HHW 100%
P.D.
FLOW MEASURING STATION CONSTANT VOLUME
Date
Main MPV-025-1 DNL DNL 3.21'
TUR4
AP-100
AP-075L
20"
TUR1
TUR30
AP-075L
100% 135
GPM P.D. GPM In Out
--
1.3 404"
36" 5.2 133" 10 - -
5.8 - -
50% DNL DNL DNA DNA - -
75%
(4) Control actuator opens and closes when t-stat set to extreme temperature. (2) FDI circuit setter. (3) Test ports clogged with debris, unable to determine flow. (1) Taco circuit setter.
Unit Size Setting
Remarks
(1)
(2)
(2)
(2) (4) (3)
PRELIMINARY
Remarks
(1) Test ports clogged with debris, unable to determine flow.
Water MBH
Delta-T
Leaving Water Temp
Entering Water Temp
Coil Pressure Drop Ft.
GPM
Sensible Air MBH
Delta-T
Leaving Air Temp D.B.
Entering Air Temp D.B.
CFM
Location
Design Actual Design Actual Design Actual Design Actual System
Water MBH 78 124 20 28 17
Delta-T 30.0 24.8 30.0 9.6 30.0 87.6
156.6
Leaving Water Temp 150.0 144.5 150.0 159.9 150.0 69.0
Entering Water Temp 180.0 169.3 180.0 169.5 180.0
Coil Pressure Drop Ft. DNL DNT DNL DNT DNT DNT
GPM 5.2 10.0 1.3 5.8 1.1 DNA
12.1 Sensible Air MBH 77 57 19 18 16 7
Delta-T 45.0 38.8 45.0 66.8 43.0
Leaving Air Temp D.B. 100.0 106.0 100.0 128.2 98.0 81.3 Entering Air Temp D.B. 55.0 67.2 55.0 61.4 55.0 69.2
Actual Design Actual
CFM 1,570 1,344 390 248 350 519
Design Actual Design Actual Design
Location 1st Floor 2nd Floor
System TUR1 TUR4 TUR30
HEATING COIL DATA
Date 27-Feb-24
(1)
PRELIMINARY
RA damper looks to be approx 95% open.
OSA damper broken off from the return air damper blades, OSA dampers look to be rusted in place at approx 30%.
Leaving Air Temp D.B.
27-Feb-24
Coil Pressure Drop DNL DNT
Design Actual
OSA @ 57.0 degrees.
Delta-T
Water MBH
Remarks
Leaving Water Temp
Entering Water Temp
Delta-T W.B.
GPM
Coil Pressure Drop
Total Air MBH
#VALUE! #VALUE!
DNL #VALUE!
Design Actual Design Actual
DNT
Design Actual Design Actual Design Actual Design Actual DNL #VALUE!
Leaving Water Temp
Leaving Air Temp D.B. DNL 67.8
Entering Air Temp D.B. DNL 73.5
Delta-T W.B.
Entering Water Temp DNL
Sensible MBH
Total Air MBH
COOLING COIL DATA
Date
Leaving Air Temp W.B. DNL DNT
Location
System AC-1
Roof
Delta-T D.B.
Entering Air Temp W.B. DNL DNT
Water MBH #VALUE! #VALUE!
Location
Delta-T D.B.
CFM
Entering Air Temp D.B.
Design Actual
Sensible MBH
Entering Air Temp W.B.
DNL 5.7
Leaving Air Temp W.B.
DNL DNT
Delta-T DNL #VALUE!
Altitude Sea Level
System
GPM DNL DNT
CFM DNL DNT
TAB FORM
Date 2/27/2024
Name Mike S.
Parameter Unit Design Measured Notes
Boiler Secondary HWST °F 180 160.5
Boiler Secondary HWRT °F 150 140 Surface temp only.
Boiler Secondary HW Flow GPM 55 130
Outdoor Air Temperature °F 57
Return Air Temperature °F 73.5 Mixing Temp=71.9 Degrees AC-1 SAT °F 67.8
AC-1 OA Damper Position % 30%
AC-1 RA Damper Position % 95%
Zone Temperature °F 70 70.2
Zone Temperature Setpoint °F 74
Heating Airflow CFM 1570 1344
Entering Air Temp °F 55 67.2
Leaving Air Temp °F 100 106
Entering Water Temp °F 180 169.3
Leaving Water Temp °F 150 144.5
Water Flow GPM 5.2 10
Calibrated Balance Valve setting 100%
Hw Control Valve Position DNA
Zone Temperature °F 70 70
Zone Temperature Setpoint °F 74
Heating Airflow CFM 390 248
Entering Air Temp °F 55 61.4
Leaving Air Temp °F 100 128.2
Entering Water Temp °F 180 169.5
Leaving Water Temp °F 150 159.9
Water Flow GPM 1.3 5.8
We will consider removing if this is a
signficant add cost for the TAB
contractor to determine.
Background
Emeryville civic center is a 18,000 SQFT existing office building. The existing system is a multiple-zone VAV reheat system with a packaged DX unit and a natural gas boiler.
Load calculations indicate that the existing systems are oversized.
The city wants to replace with an all-electric air-to-water heat pump.
The city is hesitant to adopt an all-electric design or a design with less system capacity than existing, unless they understand why comfort issues exist with the existing system.
The building currently experiences heating and cooling comfort issues.
Boiler
Terminal Unit Measurement
TUR1
TUR4
AC-1
Boiler Testing
AC Unit Measurement
TAB FORM
Calibrated Balance Valve setting 75%
Hw Control Valve Position DNA
Zone Temperature °F 70
Zone Temperature Setpoint °F
Heating Airflow CFM 350 519
Entering Air Temp °F 55 69.2 `
Leaving Air Temp °F 98 81.3
Entering Water Temp °F 180 156.6
Leaving Water Temp °F 150 69
Water Flow GPM 1.1 DNA Test ports clogged, unable to attain flow.
Calibrated Balance Valve setting 50%
Hw Control Valve Position DNA
Zone Temp at °F
6ft above floor °F 70.5
10.5ft above floor °F 70.6
16 ft below ceiling °F 71.3
Zone Temp at °F
2ft above floor °F 71.2
6ft above floor °F 71.2
1 ft below ceiling °F 72.3
Zone Temp at °F
2ft above floor °F 71.4
6ft above floor °F 71.4
1 ft below ceiling °F 71.8
Stratificati
on
Location 1
(Mark on
Stratificati
on
Location 2
(Mark on
Stratificati
on
Location 3
(Mark on
TUR30
Stratification Measurement
3 Stratification
Location 1
Stratification
Location 3
TEST & BALANCE REPORT
THIS IS TO CERTIFY THAT RSANALYSIS, LLC HAS BALANCED THE SYSTEM DESCRIBED HEREIN TO THEIR OPTIMUM PERFORMANCE CAPABILITIES, UNLESS OTHERWISE NOTED IN THE PROJECT SUMMARY. THE TESTING AND
BALANCING HAS BEEN PERFORMED IN ACCORDANCE WITH THE STANDARD REQUIREMENTS AND PROCEDURES OF THE ASSOCIATED AIR BALANCE COUNCIL AND THE RESULTS OF THESE TESTS ARE HEREIN RECORDED.
EMERYVILLE CITY HALL
1333 PARK AVENUE
EMERYVILLE, CALIFORNIA
PRE‐DESIGN SURVEY
PROJECT NUMBER:
DATE:
TECHNICIAN:
TBE:
32099-S
2/27/2024
MIKE SANDEN
JOEL JOHNSON
CLIENT: TAYLOR ENGINEERING
. .
PERFORMANCE GUARANTY
CERTIFICATE
GENERAL NOTES
SYMBOL SHEET
TEST AND BALANCE INSTRUMENTATION
PROJECT SUMMARY
BOILER TEST SHEET
PUMP DATA SHEET
FLOW MEASURING STATION
HEATING COIL DATA
COOLING COIL DATA
SCHEMATIC
4 Table of Contents
6 2
DESCRIPTION
Environmental System Testing and Balancing
C-D
PAGE
F
G
1 E
3 GENERAL INFORMATION
TAB REPORT
5 H
A-B
AABC National
Performance Guaranty Pursuant to the agreement between
AABC Certified Testing & Balancing Agency
and
Client
Associated Air
Balance Council
1518 K Street, N.W.
Washington, D.C. 20005
202-737-0202 • Fax 202-638-4833
[email protected] • www.aabc.com
All systems shall be tested and balanced in accordance with the project plans and specifications and to the optimum performance capabilities of the equipment. Testing and balancing shall be done in accordance with the standards published by the Associated Air Balance Council.
If the Agency listed above fails to comply with the specifications for any reason other than termination of business by the AABC agency or equipment malfunction or inadequacy which prevents proper balancing of the systems, AABC will investigate and, if warranted, will provide supervisory personnel to assist the member Agency to perform work in accordance with AABC Standards. This supervision will be provided at no additional cost to the building owner.
This Guaranty is valid for one year from the date of submission of a test and balance report, provided the Agency is a current member of AABC, and may only be invoked in writing by the building owner, architect, or engineer of record. The Guaranty is limited to the terms and conditions as stated herein.
Project Name
Address
Name of Engineer
Engineering Firm
Email Address
Address
Date
TBE #
By
AABC Certified TBE
RSANALYSIS, LLC
TAYLOR ENGINEERING
EMERYVILLE CITY HALL PRE͈DESIGN SURVEY
1333 PARK AVENUE
EMERYVILLE, CALIFORNIA
N/A
TAYLOR ENGINEERING
N/A
N/A
02/27/2024
24-01-131
Pursuant to the agreement between Integra Testing Services, LLC and/or its subsidiaries (“Integra Testing”) and Client, all systems shall be tested, adjusted, and balanced in accordance with the project plans and specifications and to the optimum performance capabilities of the equipment. Testing and balancing shall be done in accordance with the standards published by the Associated Air Balance Council (AABC) and/or the National Environmental Balancing Bureau (NEBB).
If Integra Testing fails to comply with the specifications or pre-determined scope for any reason other than equipment malfunction or inadequacy which prevents proper balancing of the systems, Integra Testing’s Quality Control Team will investigate and, if warranted, will provide supervisory personnel to assist in the rebalancing of the air or hydronic system(s). The rebalancing of any of the air or hydronic systems will be provided at no additional cost to the building owner.
Reported items documented outside of design tolerances with reason are not included in this warranty. If a complaint issue is due to a mechanical equipment failure, control or maintenance related issue, the return trip may be subject to a service charge which is not covered under this warranty. Third party adjustments made to the system prior to invocation of warranty also voids this warranty.
This Guaranty is valid for one year from the date of submission of a test and balance report and may only be invoked in writing by the building owner, architect, or engineer of record. The Guaranty is limited to the terms and conditions as stated herein. Response to complaints will be provided within 10 business days of initial complaint.
Joel M. Johnson, TBE
RSAnalysis, LLC - South San Francisco
24-01-131
Michael Sanden
RSAnalysis, LLC
167-01-06
GENERAL NOTES
Correction for temperature and altitude have been made on all test results shown in this report.
All corrections for instruments used for testing and balancing are traceable back to the national bureau of standards and are tested in our own labs.
Date 27-Feb-24 RSA Job # 32099
2 1
#
A F.S.R. - Floor Supply Register OPEN - No Terminal Device Installed
SYMBOL SHEET
ACCU - Air Cooled Condensing Unit GP
ADJ P.D. - Adjusted Pitch Diameter GPM - Gallons Per Minute PF - Power Factor AHU - Air Handling Unit FT. HD. - Feet of Head OSA Min. - Outside Air Minimum AC or ACU - Air Conditioning Unit FTU - Fan Terminal Unit OAT - Outside Air Temperature BH PMP - Circulating Pump
B.H.P - Brake Horsepower HC - Heating Coil P.P. - Perforated Plate AMP - Amperage GFH - Gas Fired Heater PHC - Preheat Coil AVG. - Average GFHC - Gas Fired Heating Coil PH - Phase (s) C Heater O.L. - Thermal Overload
Protection For Motors
PSI - Pounds Per Square Inch
C.D. - Ceiling Diffuser P.T. - Pitot Traverse
CFM - Cubic Feet Per Minute HEPA - High Efficiency Particulate Arrestance
R
C.E. - Ceiling Exhaust RA - Return Air
CHWR - Chilled Water Return H.P. - Horsepower RHC - Reheat Coil CHW or CHWS - Chilled Water Supply HPS - High Pressure Steam RPM - Revolutions Per Minute CEF - Ceiling Exhaust Fan H.F. - Hepa Filter RF - Return Air Fan CH - Chiller HOA - Hand/Off/Auto Switch R.G. - Return Grille C.R. - Ceiling Return HRC - Heat Recovery Coil or Heat
Reclaim Coil
S
CT - Cooling Tower SA - Supply Air
CWR - Condenser Water Return HVAC - Heating, Ventilation & Air Conditioning
SAT - Supply Air Temperature
CW or CWS - Condenser Water Supply
S.D. - Supply Diffuser
D.P. - Difference, Net Increase or
Decrease
HX - Heat Exchanger SP "WC" - Static Pressure, Measured in I Inches of Water Column
DIA - Diameter I.D. - Inside Diameter S.W.E - Sidewall Exhaust HWR - Hot Water Return or Heating
Water Return
SEF - Smoke Exhaust Fan
D SF (Air) - Supply Fan
DB - Dry Bulb HWS - Hot Water Supply or Heating
Water Supply
S.F. (Electric) - Service Factor
D.D. - Direct Drive SHC - Steam Heating Coil
E L.D. - Linear Supply Diffuser T
EAT - Entering Air Temperature LPS - Low Pressure Steam TAB - Test, Adjust, & Balance D.N.A. - Data Not Available L S.W.R. - Sidewall Return
D.N.L. - Data Not Listed LAT - Leaving Air Temperature S.W.S. Sidewall Supply EF - Exhaust Fan LWG - Low Wall Griller UH - Unit Heater EMCS - Energy Management Control
System (s)
LWR - Low Wall Return V
LWT - Leaving Water Temperature V - Volts
EDC - Electric Duct Coil L.R.D. - Linear Return Diffuser TSP - Total Static Pressure EDH - Eclectic Duct Heater L.T. - Light Troffer U
FCU - Fan Coil Unit MBH - 1000 Btu's Per Hour VFD - Variable Frequency Drive F.D. - Floor Diffuser N VP - Velocity Pressure
EWT - Entering Water Temperature M VAV - Variable Air Volume F MAU/MUA - Make Up Air Unit VD - Volume Damper
F.E. - Floor Exhaust or Return N.T. - Not Taken WB - Wet Bulb F.L.A. - Full Load Amperage N.V.L - No Valid Location W.G. - Water Gauge FH - Fume Hood N.A. - Not Accessible W
FG - Floor Grille N.I. - Not Installed W - Watts
F.S. - Floor Supply O.D. - Outside Diameter ∆T - Differential (Delta) Temperature FPB - Fan Powered Box N.Z. - Nozzle Misc.
FPM - Feet Per Minute O ∆P - Differential (Delta) Pressure
INSTRUMENT
TEST & BALANCE INSTRUMENTATION
Date 27-Feb-24 RSA Job # 32099 Technician Mike Sanden
THE FOLLOWING INSTRUMENTS WERE USED TO SUCCESSFULLY MEASURE AND SET EACH DEVICE ON THIS PROJECT.
MANUFACTURER MODEL CALIBRATION
DUE DATE
HDM-250 W17039
Evergreen S-PVF-1 2100225C
Shortridge
SERIAL NO.
Air Data Multimeter
Hydronic Manometer
11/2/2025
6/18/2024
1035 Suncast Ln. Ste. 130 El Dorado Hills, CA 95762 Office 916.358.5672
Project Summary
Date: 3/14/2024
Project: Emeryville City Hall Pre-Design Survey
Job Number: 32099
Technician: Mike Sanden
Scope of Work
Pre-design survey the existing HVAC system as requested and directed by client.
Observations & Outcomes
• All systems tested at the direction and witnessed by mechanical engineer of record (Taylor Engineering) & GSH (Kevin Meixner).
• AC-1 fan performance removed from scope while onsite by mechanical engineer. • All HVAC VAV’s are a Delta DDC type with single inlet and reheat coils at terminal units. All systems tested in “AS FOUND” mode with systems in heating mode of operation. VAVs put into heating mode by others.
• 2nd floor VAVs not communicating with the BMS system at time of testing. When RSA attempted to test the 2nd floor VAV the reheat actuator would open and then close again with t-stat set above or below the room zone temperature seen on the t-stat. RSA recommends controls system be inspected and re-established to control VAVs. • RSA found clogged test ports and were informed of multiple leaks in HHW piping requiring zones to be shut off.
• Stratification location #1 on 1st Floor at 6’ = 70.5 degrees, 10.5’ = 70.6 degrees, 16’=
71.3 degrees.
• Stratification location #2 on 2nd Floor at 6’ = 71.2 degrees, 10.5’ = 71.2 degrees, 16’=72.3 degrees.
• Stratification location #3 on 2nd Floor at 6’ = 71.4 degrees, 10.5’ = 71.4 degrees, 16’=
71.8 degrees.
In our efforts to constantly improve in all aspects of our performance, we would appreciate any feedback, positive or negative, regarding your experience with the RSA team.
Please click the link below to be directed to our Quality Assurance Survey. Thank you! RSA Quality Assurance
Remarks
Remarks
Leaving Water Temp
GPM
DNL
DNL
Service HHW
Leaving Water Temp DNA Entering Water Pressure DNA
Area Served Location
Low Fire Safety Relief Valve
GPM
Input MBH
Output MBH DNL
Entering Water Temp DNL
Boiler Data Design Data
Area Served HHW Location Roof
Equipment I.D.
Manufacture
DNL
DNL
Model DNL
DNL
Test Data
Entering Water Temp
High Fire Leaving Water Pressure
Service Leaving Water Temp
GPM
Manufacture
Outside Air Temp D.B.
Leaving Water Temp
High Fire 180 Leaving Water Pressure DNA
GPM DNA MBH Output
Entering Water Pressure
Secondary discharge temperature 160.5 degrees
(1) No test ports installed.
Date
Boiler Data Design Data
Equipment I.D. Input MBH
BOILER TEST SHEET
Date 27-Feb-24
Test Data
DNA
Low Fire 165 Safety Relief Valve 60 psi
Entering Water Temp DNA Outside Air Temp D.B. 50.0
Model Entering Water Temp
Output MBH
BOILER TEST SHEET
MBH Output
(1)
(1)
(1)
(1)
(1)
PAGE 1
VFD Hz -
Volts Volts
Amps Amps
Volts
Amps
Hz
486 480 488
1.5 1.8 1.5
-
Block Off
Remarks Secondary VAV controls not fully operational.
145T
H.P. DNL
Motor Data
Manufacture
RPM 1750
Frame
RPM
Manufacture
Frame
H.P.
Nameplate Actual Nameplate
Discharge
Suction
Delta 0.0
Discharge 31
DNT
Delta - X 2.31 = - FT. HD. X 2.31 = 0.00
Suction
FT. HD.
X 2.31 = - X 2.31 = 0.00
DNT
Discharge Discharge
FT. HD. Delta
Suction
Delta
Suction
Secondary HHW Service
Actual
GPM
0.00 PUMP DATA SHEET
Location
Pump Number P-1
Pump Data Pump Data
Date 3/14/2024
Pump Number
Roof
Manufacture
Size
Impeller
Manufacture Taco
Impeller
Size DNL
DNL
Model / Series DNL Model / Series
Actual
FT. HD. BHP
Design
Test Data Test Data
GPM FT. HD. BHP
Design DNL DNL DNL
Block Off
-0.0 FT. HD.
(1) No data tag installed.
(2) Motor data tag worn.
(3) No test port installed at time of testing.
Volts
Amps
VFD
Remarks
Actual -
Service
29.1 Motor Data
Baldor
460
2.1 (1)
(1)
(3)
(3)
(2)
(1)
PAGE 2
Design Tested Pressure
27-Feb-24 Pump Identification Secondary Pump System Type HHW 100%
P.D.
FLOW MEASURING STATION CONSTANT VOLUME
Date
Main MPV-025-1 DNL DNL 3.21'
TUR4
AP-100
AP-075L
20"
TUR1
TUR30
AP-075L
100% 135
GPM P.D. GPM In Out
--
1.3 404"
36" 5.2 133" 10 - -
5.8 - -
50% DNL DNL DNA DNA - -
75%
(4) Control actuator opens and closes when t-stat set to extreme temperature. (2) FDI circuit setter. (3) Test ports clogged with debris, unable to determine flow. (1) Taco circuit setter.
Unit Size Setting
Remarks
(1)
(2)
(2)
(2) (4) (3)
PAGE 3
Remarks
(1) Test ports clogged with debris, unable to determine flow.
Water MBH
Delta-T
Leaving Water Temp
Entering Water Temp
Coil Pressure Drop Ft.
GPM
Sensible Air MBH
Delta-T
Leaving Air Temp D.B.
Entering Air Temp D.B.
CFM
Location
Design Actual Design Actual Design Actual Design Actual System
Water MBH 78 124 20 28 17
Delta-T 30.0 24.8 30.0 9.6 30.0 87.6
156.6
Leaving Water Temp 150.0 144.5 150.0 159.9 150.0 69.0
Entering Water Temp 180.0 169.3 180.0 169.5 180.0
Coil Pressure Drop Ft. DNL DNT DNL DNT DNT DNT
GPM 5.2 10.0 1.3 5.8 1.1 DNA
12.1 Sensible Air MBH 77 57 19 18 16 7
Delta-T 45.0 38.8 45.0 66.8 43.0
Leaving Air Temp D.B. 100.0 106.0 100.0 128.2 98.0 81.3 Entering Air Temp D.B. 55.0 67.2 55.0 61.4 55.0 69.2
Actual Design Actual
CFM 1,570 1,344 390 248 350 519
Design Actual Design Actual Design
Location 1st Floor 2nd Floor
System TUR1 TUR4 TUR30
HEATING COIL DATA
Date 27-Feb-24
(1)
PAGE 4
RA damper looks to be approx 95% open.
OSA damper broken off from the return air damper blades, OSA dampers look to be rusted in place at approx 30%.
Leaving Air Temp D.B.
27-Feb-24
Coil Pressure Drop - DNT
Design Actual
OSA @ 57.0 degrees.
Delta-T
Water MBH
Remarks
Leaving Water Temp
Entering Water Temp
Delta-T W.B.
GPM
Coil Pressure Drop
Total Air MBH
#VALUE! #VALUE!
#VALUE! #VALUE!
Design Actual Design Actual
DNT
Design Actual Design Actual Design Actual Design Actual #VALUE! #VALUE!
Leaving Water Temp
Leaving Air Temp D.B. - 67.8
Entering Air Temp D.B. - 73.5
Delta-T W.B.
Entering Water Temp -
Sensible MBH
Total Air MBH
COOLING COIL DATA
Date
Leaving Air Temp W.B. - DNT
Location
System AC-1
Roof
Delta-T D.B.
Entering Air Temp W.B. - DNT
Water MBH #VALUE! #VALUE!
Location
Delta-T D.B.
CFM
Entering Air Temp D.B.
Design Actual
Sensible MBH
Entering Air Temp W.B.
#VALUE! 5.7
Leaving Air Temp W.B.
- DNT
Delta-T #VALUE! #VALUE!
Altitude Sea Level
System
GPM - DNT
CFM - DNT
PAGE 5
TUR1
TUR4 EMERYVILLE CITY HALL 1333 PARK AVE., EMERYVILLE, CA PRE-DESIGN SURVEY
ENVIRONMENTAL SYSTEM TEST & BALANCE
M2.2
1035 SUNCAST LN. STE. 130
EL DORADO HILLS, CA., 95762
PH: 888-330-1935
FAX: 916-358-5673 JOB#: DATE: SCALE: NTS PROJECT NAME: DRAWN BY: CHECKED BY: REVISION: R.HURLEY R.HURLEY FIRST FLOOR 03-22-24 32099-S
TO
AC-1
PAGE 6
TUR
30 ENVIRONMENTAL SYSTEM TEST & BALANCE
M2.3
1035 SUNCAST LN. STE. 130
EL DORADO HILLS, CA., 95762
PH: 888-330-1935
FAX: 916-358-5673 JOB#: DATE: 03-22-24 SCALE: NTS PROJECT NAME: REVISION: 32099-S DRAWN BY: CHECKED BY:R.HURLEY R.HURLEY SECOND FLOOR EMERYVILLE CITY HALL 1333 PARK AVE., EMERYVILLE, CA PRE-DESIGN SURVEY TO
AC-1
PAGE 7