新型双热源吸收式循环性能分析

PERFORMANCE ANALYSIS OF A NOVEL ABSORPTION CYCLE DRIVEN BY DOUBLE HEAT SOURCES

提出一种新型双热源吸收式制冷循环,高压发生器由动力余热驱动,产生的冷剂蒸汽部分用来驱动低压发生器I产生制冷剂蒸汽,另外一部分用来将低压发生器I和低压发生器II产生的冷剂蒸汽引射至冷凝压力。由太阳能热驱动的低压发生器II的工作压力低于冷凝压力,使系统能利用传统单效吸收式制冷系统无法利用的低温太阳能热。以水-溴化锂作为工质对,模拟结果表明:当动力余热与太阳能负荷之比在3.5以上时,新循环的COP均在0.9以上,较传统单效系统效率约高20%。

A novel absorption refrigeration cycle driven by double heat sources was presented. The part of the vapor from the high pressure generator heated by exhaust heat was used as heat source of the low pressure I. The other part of the refrigerant vapor was used to inject the vapor from the low pressure generator I and low pressure generator II to condensing pressure. The novel cycle could use low temperature solar energy which couldn＇ t be utilized by conventional single effect absorption refrigeration because the working pressure condensing pressure. Water-lithium bromide was used as the working of the low pressure generator I! was lower than fluids. The simulation results show that COP of the novel cycle is over 0.9 and is about 20% higher than that of the conventional single effect cycle when the heat capacity ratio of exhaust heat and solar energy is over 3.5.