benefits of air source heat pumps larry butz gea consulting
TRANSCRIPT
Benefits of Air Source Heat PumpsLarry ButzGEA Consulting
What is a Heat Pump?
Provides Cooling or Heating
Outdoor UnitOutdoor Unit
supply fansupply fan
compressorcompressor refrigerant pipingrefrigerant piping
Air Conditioning Clinic TRG-TRC018-ENAir Conditioning Clinic TRG-TRC018-EN© American Standard Inc. 2004
Indoor UnitIndoor Unit
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 MapHeat Pump Performance
Varies with Ambient Temperature
Heat Pumps – Year 1999
•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
•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•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
•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
