benefits of air source heat pumps larry butz gea consulting

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

Questions?

Larry ButzLButz@GEA-Consulting.com(507)-895-6826