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Performance comparison of round tubes finned heat exchangers and macro microchannel heat exchangers in a low capacity heat pump.

Number: pap. 2355

Author(s) : ZOUGHAIB A., MORTADA S., KHAYAT F., et al.

Summary

Micro-channel heat exchangers (MCHE) are used in automobile applications due to their low weight and high compactness. Those MCHE are just gaining interest in stationary application and they have a great potential for low heating capacity heat pumps to be installed in “passive houses” where the heating demand is 3 to 5 times lower than in the current new individual houses built in European countries. In this paper, a low capacity integrated air to air heat pump prototype is used to perform an experimental comparison of both a round finned tube and a MCHE used as an evaporator. The MCHE is a prototype one using flat fins. The comparison is based on a constant face surface criterion and an equivalent cooling capacity for different inlet temperature and air flow rate conditions. R-134a is the refrigerant used in the heat pump. First both evaporators’ performances are compared experimentally and the results show a clear advantage for the MCHE. In a second step, the behavior of the MCHE evaporator is studied under frosting conditions. The frosting kinetics and the defrosting behavior are analyzed. The results show a behavior similar to round tube finned heat exchangers with frosting cycle higher than 45mn and a defrosting using ventilation exhaust air in less than 10mn.

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Pages: 10 p.

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Details

  • Original title: Performance comparison of round tubes finned heat exchangers and macro microchannel heat exchangers in a low capacity heat pump.
  • Record ID : 30013302
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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