基于大滑移温度非共沸工质双冷源制冷机组的分析

Exergy Analysis of Double Cooling Source Refrigerating Unit Based on Large Temperature Glide Zeotropic Mixture

为了研究冷冻水温度对双冷源制冷机组各部件和整个系统损的影响,本文构建以R32/R236fa(质量比:60%/40%)为循环工质的双冷源冷水机组分析模型,利用双冷源制冷机组实验平台进行多组实验,通过理论分析和实验分析对系统性能进行研究。研究了冷凝温度为32℃、高低温冷冻水分别为18℃/8℃、17℃/6℃等7组时,制冷机组的理论损和实验损的变化情况。结果表明:当高低温冷冻水出水温度分别为17℃和8℃、冷凝温度为32℃时,双冷源制冷机组的总损最小为0.68 k W。此时,损最大的为压缩机,约占总损的52.7%;其次为冷凝器,约占总损的17.4%。

To study the influence of the temperature of chilled water on the exergy loss of the double cooling source refrigerating unit, the model of exergy analysis on the unit that adopts the large temperature glide zeotropic mixture R32/R236fa （60%/40%） as refrigerant is established, and the experimental platform of the double cooling source refrigerating unit was set up for experimental exergy analysis in this paper. The theoretical exergy loss and the experimental exergy loss of the refrigeration unit are studied when the condensation temperature is 32 ℃ and the temperature of chilled water is 18 ℃/8 ℃, 17 ℃/6 ℃, and so on respectively. The results show that the minimum exergy destruction occurs when the inlet water temperature of the condenser is 32 ℃, higher and lower outlet water temperatures of the evap- orator are 8 ℃ and 17 ℃. At the same time, the maximum exergy loss of the unit is compressor, followed by the condenser.