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Demonstration Project:Gas Absorption Heat Pumps for domestic hot water
Presented at the 2019 Hot Water ForumMarch 12, 2019
Presented by - Paoyun Liu
Gas Absorption Heat Pumps
Agenda:
• Why Enbridge is interested in Gas Heat Pumps/Objective of Demonstration
• Demonstration details – Pre & Post
• Results & Business Case (Energy & Environmental)
• Learnings from demonstration
• Future sites
Commercial DHW demonstration
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Gas Absorption Heat Pump
GAHP Commercial DHW Heating Demonstration to:
• Measure Performance and Operating Characteristics
• Reliability in Cold Climate
• Examine Gas Heat Pump Retrofit Process
Objective of GAHP DHW Demonstration
3
GAS ABSORPTION HEAT PUMP
4
Demonstration details
Source: The Atmospheric Fund Gas Absorption Heat Pumps: Technology Assessment And Field Test Findings Report 2018
Pilot Site:
• Senior Social Housing Complex
Toronto, Ontario (TCH)
• 372 Total Units (over two bldg.)
• Hydronic Space Heating during
Winter and DHW year-round
GAS ABSORPTION HEAT PUMP
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Demonstration details
Pre-Retrofit Boiler Plant:
• Combined Space Heating and
DHW system
• Two 4300MBH Watertube Boilers
(54% avg. measured Efficiency)
• 3200 gal. Storage Tank (130°F)
GAS ABSORPTION HEAT PUMP
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Demonstration details
Source: The Atmospheric Fund Gas Absorption Heat Pumps: Technology Assessment And Field Test Findings Report 2018
Post-Retrofit Boiler Plant:
• Two 123MBH GAHP’s (partial DHW)
• Two 878MBH Condensing Boilers(peak DHW & Space Htg.)
• Old Watertube Boiler as Peaker
GAS ABSORPTION HEAT PUMP
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Performance and operation
GAS ABSORPTION HEAT PUMP
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Performance and operation
Source: The Atmospheric Fund Gas Absorption Heat Pumps: Technology Assessment And Field Test Findings Report 2018
Hourly kBTU Output (both GAHP units)
0
250
200
150
100
50
0
125
100
75
50
25
GAS ABSORPTION HEAT PUMP
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Performance and Operation
Source: The Atmospheric Fund Gas Absorption Heat Pumps: Technology Assessment And Field Test Findings Report 2018
2520151050-5-10-15
0.50
0.75
1.00
1.25
1.50Daily GAHP Efficiency vs. Ambient Outdoor Temperature
GAS ABSORPTION HEAT PUMP
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Cost consideration
Source: The Atmospheric Fund Gas Absorption Heat Pumps: Technology Assessment And Field Test Findings Report 2018
0 2 4 6 8 10 12
GAS ABSORPTION HEAT PUMP
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Learnings from demonstration
Source: The Atmospheric Fund Gas Absorption Heat Pumps: Technology Assessment And Field Test Findings Report 2018
Successes Barriers
• Significant performance
improvement
• Reliable cold climate
operation
• Easy maintenance
• High initial capital cost
• Significant designing and
commissioning effort
• Lack of engineers and
contractors with experience
GAS ABSORPTION HEAT PUMP
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Learnings from demonstration
Source: The Atmospheric Fund Gas Absorption Heat Pumps: Technology Assessment And Field Test Findings Report 2018
GAS ABSORPTION HEAT PUMP
• Establish design package and guidelineso Optimize Paybacko Optimize Efficiencyo Optimize Emissions
• Examine integration opportunities with other technologieso Thermal storage, CHP, Instantaneous water heater, etc.
• More demonstration siteso Multi-Family, Restaurants, Gyms
Next Steps
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Gas Absorption Heat Pumps
THANK YOU.
Detailed project report is available on TAF’s website.taf.ca 14
Paoyun Liu(416) 495-5644paoyun.liu@enbridge.com
Gas Absorption Heat PumpsAPPENDIX: SCHEMATIC DIAGRAM
15Source: The Atmospheric Fund Gas Absorption Heat Pumps: Technology Assessment And Field Test Findings Report 2018
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