TFE/E181,TFE/NMP及NH3/H2O吸收式制冷系统性能研究

摘要

This paper theoretically evaluates the absorption refrigerator with TFE (Trifluoro -ethanol)/ El81 (tetraethylene glycoldimethyl ether), TFE/NMP(N-methyl pyrrolidone) and NH3/H2O as working pairs. Moreover, the COP and flow circulation ratio of three absorption systems were discussed with different temperatures, which were generator temperature, evaporator temperature, condenser temperature and absorber temperature. The results showed that the tendencies of the COP and f were similar under different temperatures. Overall, under the same condition, the COP of TFE/NMP system is the highest in these three cycles, followed by TFE/E181 and NH3/H2O. However, the flow circulation ratio (f) in these three cycles is quite the contrary: NH3/H2O system takes the first place, TFE/E181 second and TFE/NMP is the lowest.%对以TFE(三氟乙醇)/E181(四甘醇二甲醚),TFE/NMP(氮甲基吡咯烷酮)和NH3/H20为工质的吸收式制冷系统进行了评价,并基于系统的性能系数COP和循环倍率f分析了发生温度、蒸发温度、冷凝温度和吸收温度对系统性能的影响.研究结果表明:各项影响因素所造成的COP和f的变化趋势基本上一致.总体来说,在相同工况下,TFE/NMP系统的COP最大,TFE/E 181次之,NH3/H2O最小,而循环倍率f正好相反,NH3/H2O系统最大,TFE/E181次之,TFE/NMP最小.