• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 25 Issue 4
Aug.  2012
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Article Contents
JIN Dongxu, WANG Ping, KOYAMA Shigeru, TAKATA Nobuo. Effects of Internal Heat Exchanger on Performance of Transcritical CO2 Heat Pump System[J]. Journal of Southwest Jiaotong University, 2012, 25(4): 634-638. doi: 10.3969/j.issn.0258-2724.2012.04.016
Citation: JIN Dongxu, WANG Ping, KOYAMA Shigeru, TAKATA Nobuo. Effects of Internal Heat Exchanger on Performance of Transcritical CO2 Heat Pump System[J]. Journal of Southwest Jiaotong University, 2012, 25(4): 634-638. doi: 10.3969/j.issn.0258-2724.2012.04.016

Effects of Internal Heat Exchanger on Performance of Transcritical CO2 Heat Pump System

doi: 10.3969/j.issn.0258-2724.2012.04.016
  • Received Date: 30 Nov 2010
  • Publish Date: 25 Aug 2012
  • The performance of a transcritical CO2 heat pump system applied for hot water supply was experimentally investigated under various refrigerant charging conditions to clarify the effects of the heat transfer area of an internal heat exchanger (IHX) on the system performance. Experiments were conducted in the condition of constant heating capacity and evaporator outlet superheat by adjusting the compressor frequency and the opening of electronic expansion valve. Experimental results show that, at the optimum refrigerant charge, the compression ratio decreases while the discharge and suction temperatures increase with an increase in the IHX heat transfer area. Adopting an IHX can increase the maximum heating COP (coefficient of performance), and an improvement of about 3.2%- 5.1% is obtained by using an IHX with a dimensionless heat transfer area of 0.2.

     

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