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Combined industrial cooling and heating with transcritical CO2 heat pumps utilising the work of expansion.

Author(s) : HANSEN T. M., SMITH I. K., STOSIC N.

Summary

This paper describes a study carried out to evaluate the efficiency gains and cost benefits possible from a system when a twin screw machine is used to both compress and expand the working fluid in a single unit. It also shows the values of the critical design parameters required to optimise the system's potential advantages when used in larger combined heating and cooling systems in industrial process and heat generation plants. The results show that recovery of work from the expansion process improves the COP by 15 to 20%. Depending on the operating conditions, transcritical CO2 heat pumps using a compressor expander can produce hot water at 90 °C with a COP of approximately 7, with thermal outputs of up to 1.5 MW. This could be extended with simple control strategies up to outputs of 10 MW.

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Pages: 2004-2

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Details

  • Original title: Combined industrial cooling and heating with transcritical CO2 heat pumps utilising the work of expansion.
  • Record ID : 2005-2241
  • Languages: English
  • Source: Natural Working Fluids 2004: 6th IIR-Gustav Lorentzen Conference
  • Publication date: 2004/08/01

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