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Residential CO2 heat pump system for combined space heating and hot water heating.

Author(s) : STENE J.

Type of article: Article, IJR article

Summary

A theoretical and experimental study has been carried out for a residential brine-to-water CO2 heat pump system for combined space heating and hot water heating. A 6.5 kW prototype heat pump unit is constructed and extensively tested in order to document the performance and to study component and system behaviour over a wide range of operating conditions. The CO2 heat pump is equipped with a unique counter-flow tripartite gas cooler for preheating of domestic hot water (DHW), low-temperature space heating and reheating of DHW. The CO2 heat pump is tested in three different modes: space heating only, DHW heating only and simultaneous space heating and DHW heating. The heat pump unit gives off heat to a floor heating system at supply/return temperatures of 33/28, 35/30 or 40/35 °C, and the set-point temperature for the DHW is 60, 70 or 80 °C. Most tests are carried out at an evaporation temperature of -5 °C, and the average city water temperature is 6.5 °C. The experimental results prove that a brine-to-water CO2 heat pump system may achieve the same or higher seasonal performance factor than the most energy efficient state-of-the-art brine-to-water heat pump systems as long as: 1) the heating demand for hot water production constitutes at least 25% of the total annual heating demand of the residence; 2) the return temperature in the space heating system is about 30 °C or lower; 3) the city water temperature is about 10 °C or lower; and 4) the exergy losses in the DHW tank are small.

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Pages: 1259-1265

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Details

  • Original title: Residential CO2 heat pump system for combined space heating and hot water heating.
  • Record ID : 2006-0969
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 8
  • Publication date: 2005/12

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