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Experimental analysis of the use of a subcooler coupled with the evaporator in a water to water CO2 heat pump for hot water generation.

Number: 0737

Author(s) : GARCIA CASCALES J. R., ILLÁN GÓMEZ F., SANCHEZ VELASCO F. J., DELGADO MARÍN J. P., OTON MARTINEZ R. A.

Summary

The use of dedicated mechanical subcooling and/or internal heat exchanger has been promoted as a measure to improve the performance of transcritical CO2 cycles. This paper evaluates the use of a subcooler to improve the  performance  of  a  transcritical  CO2  heat  pump  for  the  production  of  domestic  hot  water.  This  is  a  refrigerant‐to‐water heat exchanger, which means that the secondary fluid entering this heat exchanger is water  coming  from  the  heat  source  which  is  initially  heated  by  the  refrigerant  in  this  subcooler  prior  to  passing  through  the  evaporator.  Firstly  the  problem  is  contextualised  and  the  installation  used  to  experimentally analyse the effect of this heat exchanger is presented. The different devices that comprise it are briefly enumerated and the test matrix considered to carry on this study is shown. Three different levels of temperature are considered to define these tests for both the hot water circuit which feeds the evaporator and the cold water circuit that feed the gas cooler. Finally the experimental results obtained are presented and some conclusions are drawn. A slight improvement of the performance due in part to the increase of the evaporation temperature is shown. 

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Pages: 6

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Details

  • Original title: Experimental analysis of the use of a subcooler coupled with the evaporator in a water to water CO2 heat pump for hot water generation.
  • Record ID : 30031460
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0737

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