Experimental and theoretical study on a novel double evaporating temperature chiller applied in THICS using R32/R236fa. (March 2017)

• Record Type: Journal Article
• Authors: Liu, Jian; She, Xiaohui; Zhang, Xiaosong; Cong, Lin; Man, Liang; Lindeman, Brett; Lin, Tao
• Is Part Of: International journal of refrigeration. Volume 75(2017)
• Page Start: 343
• Page End: 351
• Publication Date: 2017-03
• Subjects: Double evaporating temperature -- Zeotropic refrigerant -- Second law efficiency -- COP -- Chiller; Double température d'évaporation -- Frigorigène zéotropique -- Efficacité selon le second principe -- COP -- Refroidisseur; Refrigeration and refrigerating machinery -- Periodicals; 621.56
• DOI: 10.1016/j.ijrefrig.2016.08.015
• Languages: English
• ISSNs: 0140-7007

Abstract

Highlights: A novel double temperature chiller with zeotropic refrigerant is proposed. This chiller can produce chilled water with two different temperatures for THICS. Effect of refrigerant mass fraction on COP and second law efficiency is studied. Effect of water flow rate and temperature on chiller performance is studied. Abstract: 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.