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余热吸收式制冷技术因其良好的节能减排效果以及环境友好性,已成为余热回收利用的重要技术。本文基于流程模拟技术,采用能级分析法对单效Li Br-H2O余热吸收式制冷循环进行分析与改进。结果表明:在基础模拟工况下制冷循环的性能系数COP为0.59,?效率为13.5%。通过将溶液热交换器的效率从0.61提高至0.80,制冷循环的性能系数COP提升至0.71,提高了20.3%,?效率为17.7%,提高了31.1%。将热源温度提高至120℃,性能系数COP提升至0.66,提高了11.9%,系统冷量?输出为61.59k W,?效率为15.4%,提高了14.4%。提高溶液热交换器效率提高了热源转化为冷量的效率,使得系统的源阱匹配更为合理。提高溶液热交换器效率对系统性能的提升优于提高热源温度。
Waste heat absorption refrigeration technology has become an important technology for waste heat recovery because of its good energy-saving and emission reduction effect and environmental friendliness. Based on the process simulation technology, this paper analyzes and improves the single effect Li Br-H2O waste heat absorption refrigeration cycle by energy level analysis. The results show that the coefficient of performance COP of the refrigeration cycle is 0.59 and the efficiency is 13.5% under the basic simulation conditions. By increasing the efficiency of the solution heat exchanger from 0.61 to 0.80, the coefficient of performance COP for the refrigeration cycle increased to 0.71, an increase of 20.3%, an efficiency of 17.7% and an increase of 31.1%. When the heat source temperature is increased to 120 ℃, the coefficient of performance COP increases to 0.66, an increase of 11.9%. The output of the system is 61.59kW, and the efficiency is 15.4%, an increase of 14.4%. Increasing the efficiency of the solution heat exchanger increases the efficiency of converting the heat source to cold, making the system’s source-well matching more reasonable. Increasing the efficiency of the solution heat exchanger improves the system performance better than increasing the heat source temperature.