introduction to heat pumps

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  • 1. Heat pump W. Hulshorst Nov. 2008 Business Connecting and Development

2. Agenda

  • Introduction
  • 2) Overview of heatpumps (Europe)
  • 3) Airsource heatpump technology
  • 4) Coeffcient of performance
  • 5) installation of heatpumps
  • 6) case study with RETscreen

Business Connecting and Development 3. What is a heatpump? Business Connecting and Development

  • A device that transfers heat energy
  • Examples: air conditioner; refrigerator

4. Bicycle pump Business Connecting and Development P x V / T = C Heat 5. Airco heat transfer Business Connecting and Development Hot air Cold air 6. Heat transfer Business Connecting and Development

  • Condensor

2. Expansion 3. Evaporator 4. Compressor 7. Heating and cooling mode Business Connecting and Development Air heat pumps are ideal for mild climates 8. Other types of heat pump Business Connecting and Development Ground heat pump In this solutionthe heat pump uses a pipe-loop buried about a metre below ground. 9. Other types of heat pump Business Connecting and Development Water heat pumpsA water heat pump is a variant of the ground heat pump. Theonly difference is that it uses ahose on the lake floor (or other water source) instead of apipe buried below ground. 10. Other types of heat pump Business Connecting and Development Rock heat humps A rock heat pump is anothervariant of ground heat pumps,and a very common one. The system uses the solar energystored in the rock shelf andthe loop is lowered into a100150 metres bore holein the rock . 11. Choice of technology Business Connecting and Development Heating 15 40 kW Lake water Northern + Central Europe Heating + cooling 5 40 kW Ground rock Northern + Central Europe Heating 5 25 kW Ground soil Southern Europe Heating + cooling 3 5 kW Air- Air Dominant region Application Common capacity range Type of heat pump 12. Efficiency Coefficient of performance (COP): COP = Output/Input = 3 to 5Heat pump 3 5 kWh of heat 2 4 kWh of air heat 1 kWh electricity 13. COP

  • Larger temperature difference means less COP
  • Air type is less efficient at low ambient temperatures.

14. Design Business Connecting and Development The design and installation of a heat pump systemmust also address:

  • the duct system must be correctly designed to work with
  • the heat pump equipment and to distribute conditioned
  • air sufficiently throughout the house;
  • the duct system must be properly installed and sealed
  • to ensure its performance.

15. installation Business Connecting and Development In general, correct heat pump installation can be achieved by addressing four critical areas: 1. the indoor air handler, especially the airflow over thefan-coil unit and through the forced air duct system; 2. the refrigerant system, especially the refrigerant charge; 3. the outdoor unit, especially its air supply; and 4. the control system, especially the thermostat that turnsthe equipment on and off. 16. Maintenance (1) Business Connecting and Development

  • In general:
  • Dirty filters, coils and fans reduce airflow through the system
  • The fan should be cleaned
  • Ductwork should be inspected and cleaned

17. Maintenance (2) Business Connecting and Development Heat pump manufacturers recommend that homeownersconsider the following operational and maintenance issues:

  • a heat pump works most efficiently when it maintains a
  • constant room temperature; avoid large temperature
  • changes overnight or during the day;
  • the system will periodically go into defrost mode to remove
  • any ice build up on the outdoor coil in the winter;
  • the outdoor unit should be positioned above the prevailing
  • snow-line, with suitable clearance around the unit
  • maintained all year round;
  • expect the unit to run continuously in periods with low
  • outdoor temperatures, or switch over to the supplementary
  • heating system.

18. Thanks for your attention Walter Hulshorst Econ International B.V.PO box 5035 6802 EA Arnhem The Netherlands T: + 31 (0)61 047 45 77 F: + 31 (0)26 381 64 82 E:walter @ Business Connecting and Development 19. Case Study Business Connecting and Development

  • Residential Heat pump
    • 550 m2
    • Heating load: 18.4 W/m2
    • Cooling load: 28.4 W/m2
  • Base Case
    • Diesel Boiler: 78% seasonal efficiency
    • AirCo: CoP 3