Transcript Benefits of Air Source Heat Pumps

Benefits of Air Source Heat
Pumps
Larry Butz
GEA Consulting
What is a Heat Pump?
Provides Cooling or Heating
Outdoor Unit
Indoor Unit
supply fan
compressor
© American Standard Inc. 2004
refrigerant piping
Air Conditioning Clinic TRG-TRC018-EN
Heat Pump Growth
Why?
Heat Pump Can Offer Lower Operating
Costs than Fossil Fuels
• Fossil Fuels Efficiency Limit ~100%
• Electric Resistance Heat Efficiency = 100%
• Heat Pumps Efficiency >100%
COP = Heating or Cooling Delivered/Energy Input
Operating Map
Heat Pump Performance Varies
with Ambient Temperature
Heat Pumps – Year 1999
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Low Heating Output
Low Air Discharge Temperatures
Limited Range (Min 25 F)
High Compressor Failure Rate
Poor Efficiencies
No Operating Cost Savings
Heat Pumps – Year 2010
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Low Heating Output
Increased
Low Air Discharge Temperatures
Increased
Limited Range (Min 25 F)
Now -10F
High Compressor Failure Rate
Eliminated
Poor Efficiencies
High Efficiencies
No Operating Cost Savings
Improvements Due to
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Scroll Compressor Replaced Reciprocating
Variable Speed Drives
New Lubricants and Refrigerants
Extensive Testing
Better Computer Models
Use EXV and TXV to replace Cap Tubes
New Heat Transfer Surfaces
Control Algorithms Advanced
Part Load Performance Improvement
System Enhancements (vapor injection, 2 stage)
Market Drivers
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Legislated Energy Efficiency Increases
Large Heat Pump Markets (China)
Cost of Energy
Environmental
Scroll vs. Reciprocating Compressor
Operating Map
Opportunities?
Heat pump has higher efficiency and higher
capacity at higher ambient temperatures
Daytime operation to use excess heating capacity
(at higher COPs) to store heat for night time use
Questions?
Larry Butz
[email protected]
(507)-895-6826