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根据热力学第二定律,对一种新型低温热源喷射式发电制冷复合系统进行了分析,并以R600a作为工质对系统进行了仿真计算.结果表明:在热源入口温度为420 K、热源热水流量为0.2kg/s、热源蒸发温度为370 K的标准工况下,系统净发电量为2.74 kW,系统制冷量为11.99 kW,系统的效率达到25.83%,系统能量利用率为45.34%;系统损失主要发生在蒸汽发生器和喷射器中.在热源蒸发温度提高过程中,系统内部工质流量发生改变,导致系统净发电量和效率小幅下降,制冷量和能量利用率先增后降.当热源蒸发温度为370 K时,系统能量利用率达到最大值.
According to the second law of thermodynamics, a new low-temperature heat-source-jet refrigeration system was analyzed and the system was simulated with R600a as the working fluid.The results show that when the inlet temperature of heat source is 420 K, Under the standard conditions of flow rate of 0.2 kg / s and heat source evaporation temperature of 370 K, the net power generation is 2.74 kW, the system cooling capacity is 11.99 kW, the efficiency of the system reaches 25.83% and the system energy utilization rate is 45.34%. The system losses mainly occur in the steam generator and ejector, and the flow rate of the working fluid in the system changes during the increase of the heat source evaporation temperature, resulting in a slight decrease of the net generating capacity and efficiency of the system, and the cooling capacity and the energy utilization rate increase first and then decrease. When the heat source evaporation temperature is 370 K, the system energy utilization reaches the maximum value.