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本文研究了一种完全由余热驱动的吸收压缩复合式低温制冷系统。该系统由混合工质动力子循环和吸收压缩复合式制冷子循环有机耦合而成,模拟计算结果表明,该系统在制取-55℃冷量时的整体性能系数和效率分别达到了0.357和28.02%,分别比参比系统提高了19%和57.77%。通过分析和循环耦合分析,揭示了该系统的节能机理。另外,还研究了动力子循环工质浓度、透平入口压力和压缩机出口压力对系统热力性能的影响。结果表明,为了保证较高的热力性能,这三个影响因素均存在最佳值,且其中压缩机出口压力最为敏感。经济性分析指出,新系统比投资比参比系统相对减小了12.23%。本研究为分布式供能系统提供了新的余热利用方法。
In this paper, an absorption-compression hybrid cryogenic refrigeration system driven completely by residual heat is studied. The system is made up of organic coupling of mixed working substance sub-cycle and absorption-compression compound refrigeration sub-cycle. The simulation results show that the overall performance coefficient and efficiency of this system are 0.357 and 28.02%, respectively, 19% and 57.77% higher than the reference system. Through analysis and cyclic coupling analysis, the energy saving mechanism of the system is revealed. In addition, the effects of circulating working fluid concentration, turbine inlet pressure and compressor outlet pressure on the thermal performance of the system were also studied. The results show that, in order to ensure high thermal performance, the three factors are the best value, and the compressor outlet pressure is the most sensitive. Economic analysis pointed out that the new system relative investment than the reference system decreased by 12.23%. This study provides a new method of waste heat utilization for distributed energy supply system.