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Natural refrigerants: an option for heat pumps?

Author(s) : HALOZAN F.

Summary

The technology used for ammonia (R717) is different from the technology used with fluorocarbons. Considering the technology presently used in large scale manufacturing, propane (R290) is an excellent choice, it requires practically no changes in technology. The only disadvantage is flammability. Present regulations are a barrier for using this environmentally benign refrigerant. However, outdoor installation is possible: highly efficient outside-air heat pumps with variable-speed compressors as well as the cascade flow sheet, two units arranged in series with a common condenser/evaporator, are already available, direct-evaporation ground-coupled systems with performance factors of more than 4.4 are already in operation, performance factors of 5 are expected in the near future. The transcritical CO2 (R744) cycle is an interesting solution for applications, where a high temperature lift at the heat sink side is required.

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Pages: 8 p.

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Details

  • Original title: Natural refrigerants: an option for heat pumps?
  • Record ID : 1997-0698
  • Languages: English
  • Source: Refrigeration, Climate Control and Energy Conservation.
  • Publication date: 1996/02/11
  • Document available for consultation in the library of the IIR headquarters only.

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