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Ecopac – isobutane heat pump acting as economizer.

Number: 0093

Author(s) : GRANRYD E., PALM B., ÖLEN V., ANDERSSON K., NOWACKI J. E.

Summary

In a conventional heat pump system, the throttling of the warm refrigerant liquid in the expansion valve is one of the main losses. One way to reduce these losses is to sub-cool the fluid before it enters the expansion valve. This project will investigate the possible benefits of using an “economizer”, sometimes called a mechanical subcooler. By means of this the heating capacity can be increased as well as the COP of the system. The intention of the project is to use an economizer unit in the form of a small high temperature heat pump with isobutane, R600a, as refrigerant. This unit, in short here called an Ecopac-unit will thus be used as an economizer for a larger propane, R290, heat pump, but could potentially also be used for other refrigerants in the main system. The hot side of the isobutane heat pump can be used for heating of hot tap water i.e., temperatures in the range of 50-70 °C. The isobutane heat pump will use the liquid refrigerant after the condenser as heat source and will hence sub-cool the refrigerant fluid in the main heat pump. The isobutane heat pump will be working with evaporating temperatures in the range of 15-35°C.
In this paper the potential performance of such a system is simulated and some initial experimental results are given.

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Pages: 9 p.

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Details

  • Original title: Ecopac – isobutane heat pump acting as economizer.
  • Record ID : 30029700
  • Languages: English
  • Subject: Technology
  • Source: 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2022). Proceedings. Trondheim, Norway, June 13-15th 2022.
  • Publication date: 2022/06/13
  • DOI: http://dx.doi.org/10.18462/iir.gl2022.0093
  • Document available for consultation in the library of the IIR headquarters only.

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