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Experimental study on heat pump system for hot water heating using CO2 as a refrigerant.

Number: pap. n. 210

Author(s) : KOSUDA O., OGATA T., TANIGUCHI K., et al.

Summary

This paper presents an experimental study on heat pump system for hot water heating using CO2 as a refrigerant. From the viewpoint of the sector emitting CO2, CO2 emissions of residential housing are large. And, heating purposes hold a large ratio on the whole energy consumption of housing. It is remarkable on cold European cold climates. High temperature radiators are used mainly for space heating on cold European climates. High temperature radiators are mainly heated by a fossil fuel-burning boiler emitting a lot of CO2. We noticed the characteristics of CO2 refrigerant, which has a high heat capacity and can produce hightemperature water. With the aim of greatly reducing current CO2 emission levels by converting their fossilfuel- burning boilers to heat pumps that use CO2 as a refrigerant, we began the development of a highefficiency heat pump system for hot water heating using CO2 as a refrigerant. We carried out the following: 1) The development of power recovery technology using an expander, 2) The construction of a high-efficiency injection control system for responding to changes in ambient temperature, 3) The verification of the efficiency improvement and the reliability through field test in a cold European climate. As a result, we carried out a low-temperature intermittent defrost operation over 1,000 hours in a cold European climate, and achieved the performance improvement of 15%, by constructing the power recovery type heat pump system using a compressor combined with expander.

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Pages: 8 p.

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Details

  • Original title: Experimental study on heat pump system for hot water heating using CO2 as a refrigerant.
  • Record ID : 30004435
  • Languages: English
  • Source: 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
  • Publication date: 2012/06/25

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