Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (6): 108-113.

• Power & Electrical Engineering • Previous Articles     Next Articles

Heat Exchange and Fluid of Refrigerant in Heat-Pump Air Conditioner

Liu Jin-ping 1.2  Ye Can-tao3  Wen Nan-zhen4   

  1. 1. School of Electric Power, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, Guangdong, China; 3. Guangzhou Telecom Design Corporation, Limited, Guangzhou 510630, Guangdong, China; 4. Guangzhou Office of Lighting Installation Inspection, Guangzhou 510600, Guangdong, China
  • Received:2007-04-29 Revised:2007-05-30 Online:2008-06-25 Published:2008-06-25
  • Contact: 刘金平（1962-），男，教授，主要从事空调系统和制冷设备优化研究． E-mail:mpjpliu@seut．edu．cn
  • About author:刘金平（1962-），男，教授，主要从事空调系统和制冷设备优化研究．
  • Supported by:

    “十一五”国家科技支撑计划重大项目（2006BAJ03A06）;2007年粤港关键领域重点突破项目（TC07BF09-5）

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Abstract:

The heat exchange performance of the outdoor unit and its effect on the COP of a heat-pump air conditioner with R22 as the refrigerant were tested and practically investigated. The results show that （ 1 ） the phase change of the refrigerant in the outdoor unit is an inconstant temperature process with a slight temperature variation of less than 0. 5℃ ; （2） the refrigerant pressure drop of the outdoor unit in heating condition is 3 - 5 times that in refrigerating condition; and （3） when the heat exchange area of the outdoor unit is larger than that of the indoor unit and when the outdoor unit area decreases by 20%, the heat exchange quantum of the condenser decreases only by 5.75% and the COP of air conditioner decreases by 4. 00% at an outdoor unit area decrease of 20% in refrigerating condition. However, in heating condition, the decreases of the two items respectively change into 3.75% and 2.25 %.

Key words: heat-pump air conditioner, refrigerant, heat exchange performance, pressure drop