以溴化锂溶液为工质的吸收式热转换器热力学分析

Thermodynamic analysis for LiBr-H_2O absorption heat transformer

以溴化锂溶液为工质的吸收式热转换器为对象,对不同操作温度下的可逆性能系数、基于焓的性能系数、基于有效能的性能系数和循环比与操作温度之间的关系进行了计算和分析.另外,分析了溶液换热器的换热效率对吸收式热转换器系统性能系数的影响.所得结论对于吸收式热转换器的设计和实际操作具有指导意义.

Absorption heat transformer (AHT) shows a promising potential for recovering waste heat and reusing in the industrial processes at higher temperature. The analyses based on the Second Thermodynamic Law are conducted to study the effects of the operating conditions on the coefficients of the performance (COP) in terms of the reversibility of the cycle, the enthalpies of the working pair and the available energy as well as the circulation ratio for an absorption heat transformer with aqueous lithium bromide solution as working pair. The effect of a solution heat exchanger on the enthalpy COP is also discussed. The conclusions drawn from the results provide more deep insights for the optimum operation and the design of AHT system.