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Thermal-fluid performance modelling of a transcritical carbon dioxide heat pump for high temperature applications.

Number: 2162

Author(s) : VAN ELDIK M., VENTER P., BOTHA M.

Summary

The South African industrial sector is mainly dependent on the use of electricity and coal for the generation of process heat. The environmental impact of the existing methods is such that implementing alternative heating solutions are unavoidable. One solution, to reduce electrical consumption, is the implementation of energy efficient air-to-water heat pumps in place of existing technologies for the lower range of process temperature requirements of up to 100°C. Conventional heat pumps, however, have a limitation to generate warm water efficiently above about 65°C. Furthermore, the negative environmental impact of freon based systems encourages the need to consider the implementation of natural refrigerants. Carbon dioxide (R744) has been identified as a working fluid due to the low environmental impact and the capability to deliver higher discharge water temperatures while maintaining a high efficiency. To achieve this the CO2 heat pump cycle needs to be operated transcritical with very high system pressures. Research has focused on the detailed modelling of the individual components, but the next step is to develop a complete heat pump cycle simulation model. This paper discusses the simulation model developed, and preliminary results obtained, when operating in warm South African ambient conditions, while heating water to temperatures required for industrial processes.

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Pages: 10 p.

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  • Original title: Thermal-fluid performance modelling of a transcritical carbon dioxide heat pump for high temperature applications.
  • Record ID : 30030501
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022/07/10

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