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Retrofit heat pump with high energetic efficiency based on an eco-friendly refrigerant.

Author(s) : IMMEL M., BÜHRING A., HAFNER B., et al.

Summary

The intention of this R&D project is the development of an electrical driven heat pump with the refrigerant CO2 for the retrofit market, which is reaching the demands of existing houses. The main barriers for using heat pumps in old buildings for the retrofit are the high inlet temperatures of 70 up to 90°C. This is too high for the present heat pumps. The designed heating system with heat pump and electric heater permits to cover the heating demand of a house with 20 kW max. capacity at design temperature. The seasonal performance factor (SPF) target is 3.3. Space heating (90%) and tap water heating (10%) will be realised with an economiser cycle and hot gas injection in the compressor. The bivalent point is fixed at -7°C (13 kW). The annual energy consumption of the electrical heater amounts to 5% (calculation result). Also, a prototype of a CO2 compressor with the necessary capacity, high efficiency, high condensing temperatures, a perspective of low production costs and with a long lifespan will be developed during this project.

Details

  • Original title: Retrofit heat pump with high energetic efficiency based on an eco-friendly refrigerant.
  • Record ID : 2009-0845
  • Languages: English
  • Source: 9th IEA Heat Pump Conference 2008: advances and prospects in technology, applications and markets. Conference proceedings [CD-ROM + abstracts].
  • Publication date: 2008/05/20

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