提出一种新型以溴化锂溶液为工质的高温双再生器型吸收式热变换器（HDAHT）循环系统,该系统在高温单级吸收式热变换器循环中再生器和冷凝器之间增加了第二级再生器.HDAHT系统可以将高温废热源的温度进一步提高至有用温位.对HDAHT内各参数对系统性能系数COP的影响进行了模拟计算.计算结果表明,系统性能系数COP随着蒸发温度、低压再生器温度和溴化锂溶液中间浓度的升高而增大,随着吸收温度、高压再生器温度和溴化锂稀溶液浓度的升高而减小.在适合的操作条件下,本循环的系统性能系数COP达到了0.61,是高温单级吸收式热变换器的1.2倍.所得到的这些规律将为高温吸收式热变换器设计系统优化提供必要的理论依据.%A new high temperature double effect lithium bromide solution absorption heat transformer(HDAHT)system is presented,which consists of a second effect generator between the generator and condenser of the high temperature single effect absorption heat transformer system(HSAHT).The HDAHT has the unique capability of raising the temperature of high temperature waste heat sources to more useful levels.The influence of the various operating parameters on the system′s coefficient of performance(COP)for the HDAHT is simulated.It is found that the COP increases when the evaporator temperature,low pressure generator(LPG)temperature and the intermediate concentration of lithium bromide increase and decreases with increments of the absorption temperature,high pressure generator(HPG)temperature and the weak concentration of lithium bromide.In certain operating conditions,the COPof HDAHT system can be 20% more than that of the HSAHT,reaching to 0.61.The obtained results can be helpful to improving the HDAHT system performance and making the design of the system optimum.
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