1. Benefits of Air Source Heat Pumps Larry Butz GEA Consulting

2. What is a Heat Pump?

3. Provides Cooling or Heating

4. Outdoor Unit supply fan compressor refrigerant piping Air Conditioning Clinic TRG-TRC018-EN © American Standard Inc. 2004 Indoor Unit

5. Heat Pump Growth

6. Why?

8. 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

9. Operating Map Heat Pump Performance Varies with Ambient Temperature

10. 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

11. 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 EfficienciesHigh Efficiencies No Operating Cost Savings

12. 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)

13. Market Drivers Legislated Energy Efficiency Increases Large Heat Pump Markets (China) Cost of Energy Environmental

14. Scroll vs. Reciprocating Compressor

15. Operating Map

16. 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

17. Questions? Larry Butz LButz@GEA-Consulting.com (507)-895-6826