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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 type of high temperature double regenerator absorption heat exchanger (HDAHT) circulation system using lithium bromide solution as working fluid was proposed. This system adds the heat transfer coefficient between the regenerator and the condenser in the high temperature single stage absorption heat exchanger cycle, Secondary regenerator.HDAHT system can further increase the temperature of high temperature waste heat source to a useful temperature.The simulation results of the influence of various parameters on the system performance coefficient COP in HDAHT are given.The calculation results show that the COP of the system performance coefficient increases with the evaporation temperature , Low-pressure regenerator temperature and intermediate concentration of lithium bromide solution increases, with the absorption temperature, high-pressure regenerator temperature and concentration of dilute lithium bromide solution decreases in the appropriate operating conditions, the system performance of the cycle The coefficient of COP reached 0.61, which is 1.2 times higher than that of single-stage high-temperature absorption heat exchanger. These rules will provide the necessary theoretical basis for the design optimization of high-temperature absorption heat exchanger.