Experimental and theoretical study on a novel double evaporating temperature chiller applied in THICS using R32/R236fa

Research output: Contribution to journalArticlepeer-review


  • Jian Liu
  • Xiaosong Zhang
  • Lin Cong
  • Liang Man
  • Brett Lindeman
  • Tao Lin

External organisations

  • Southeast University
  • University of Wisconsin-Madison


A novel chiller with double evaporating temperatures is proposed in this paper, which can be applied in temperature and humidity independent control system (THICS). A zeotropic mixture R32/R236fa is selected as the refrigerant, and chilled water with two different temperatures is produced. The experimental coefficient of performance (COPexp), theoretical coefficient of performance (COPth), and second law efficiency (η) of the chiller are studied. The performance of the chiller is studied by varying the mass fraction of R32 in the R32/R236fa (W(R32)), chilled water temperature, and the flow rates of the heat transfer media (chilled water and cooling water). The results show that the high temperature chilled water (TH,out) can be at 15-18 °C, and the low temperature chilled water (TL,out) can be at 6-8 °C. When TH,out is 17 °C and TL,out is 7 °C, the maximum COPth and COPexp are 4.73 and 3.97, respectively. Second law efficiency, η, increases to 31% as W(R32) increases from 0.3 to 0.6.


Original languageEnglish
JournalInternational Journal of Refrigeration
Early online date31 Aug 2016
Publication statusE-pub ahead of print - 31 Aug 2016


  • double evaporating temperature, chiller, COP, second law efficiency, zeotropic refrigerant