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The effects of the orientation of outdoor microchannel heat exchanger on the performance of a transcritical R744 heat pump during frosting and defrosting.

Number: 2149

Author(s) : ZHANG W., HRNJAK P.

Summary

This paper presents the transient performance of a transcritical R744 heat pump (HP) system with a horizontally and vertically oriented outdoor microchannel heat exchanger during continuous frosting and defrosting cycles. The refrigerant migration, heating capacity, efficiency degradation during the frosting process, and the water retention after defrosting are presented and discussed. The frosting and defrosting functions were monitored using three web cameras to understand better the refrigerant and frost distribution on the two-pass outdoor coil. The results show that the vertically oriented outdoor coil improves heat pump performance both in frosting and defrosting due to better distribution of two-phase refrigerant and water drainage.

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Pages: 9 p.

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Details

  • Original title: The effects of the orientation of outdoor microchannel heat exchanger on the performance of a transcritical R744 heat pump during frosting and defrosting.
  • Record ID : 30030490
  • 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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