LiBr—H2O喷射—吸收复合热泵装置热力过程分析

吸收热泵是回收低温位热能的有效装置.在吸收热泵的发生器和冷凝器之间增添了一个喷射器.构成了一种新型的喷射-吸收式热泵系统.依据喷射器理论和吸收循环理论,对这种新型喷射-吸收式热泵的热力性能进行了模拟.计算了不同工况下系统的性能系数和喷射器的喷射系数.探讨了喷射系数、冷凝温度、蒸发温度和发生温度等对系统性能系数和(火用)效率的影响规律.模拟结果表明.该新型喷射-吸收式热泵比常规吸收式热泵的性能系数有明显的增大,而系统的复杂性基本没有增加.

Analysis of thermodynamic performance of combined ejection-absorption heat pump with LiBr-H 2O

Absorption heat pump is an effective installation for recovering low temperature heat. A novel ejection-absorption heat pump is proposed by adding an ejector between the generator and condenser in absorption cycle. Based on the theories about ejector and absorption cycle, the thermodynamic performances of this novel ejection-absorption heat pump are simulated in detail. The coefficient of performance(%COP%) and entrainment ratio of ejector under different conditions are calculated. The effects of entrainment ratio, condensation, evaporation and generation temperatures on the %COP% and exergetic efficiency are also analyzed. The results show that compared with a conventional absorption heat pump, the %COP% of the novel heat pump is increased obviously, while system complexity is not increased a little.