A novel low-grade heat-driven absorption refrigeration system with LiCl-H2O and LiBr-H2O working pairs
A novel low-grade heat-driven absorption refrigeration system with LiCl-H2O and LiBr-H2O working pairs
复制标题
一种新型低品位热驱动吸收式制冷系统，具有LiCl-H2O和LiBr-H2O工作对
DOI：
10.1016/j.ijrefrig.2015.06.016
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Zhang Xiaosong
中科院分区：
文献类型：
--
作者：
She Xiaohui;Yin Yonggao;Xu Mengfei;Zhang Xiaosong
提出了一种新型的低品位热驱动吸收式制冷系统，高压循环采用较高蒸气压的LiClH2O，低压循环采用较低蒸气压的LiBrH2O。分析了关键参数对系统性能的影响，并考虑了不同的热源利用模式：并行模式(PM-1和PM-2)和串联模式(SM)。并将PM-1、PM-2、SM与传统的双级溴化锂-水吸收系统(TDS)进行了比较。结果表明，在较小的工况范围内，PM-1的COP明显高于TDS，最大COP改善26.7%；而PM-2在较宽的工作范围内表现出明显的优势，最大COP改善35%。此外，在较高的冷凝温度和蒸发温度下，PM-1的COP比SM高得多，而SM的热源出口温度比PM-1低最多12℃。中间压力是影响系统性能的重要因素，PM-1和SM的最佳值分别为2.27和2.5kPa.对于PM-2，在低压循环中，应选择中压以获得较低的循环比。
A novel low grade heat-driven absorption refrigeration system is proposed, where LiCl–H2O with higher vapor pressure is used in the high-pressure cycle and LiBr–H2O with lower vapor pressure is employed in the low-pressure cycle. Effects of key parameters on the system performance are analyzed, and different heat source utilization modes are considered: parallel modes (PM-1 and PM-2) and serial mode (SM). What's more, comparisons among the PM-1, PM-2, SM and the traditional double-stage LiBr–H2O absorption system (TDS) are made. Results show that the PM-1 has much higherCOPthan the TDS under small ranges of working conditions, with the maximumCOPimprovement 26.7%, while the PM-2 shows prominent advantages under wider ranges, with the maximumCOPimprovement 35%. In addition, The PM-1 shows much higherCOPthan the SM under higher condensing temperature and evaporation temperature, while the SM has much lower heat source outlet temperature which is at most 12 °C lower than that of the PM-1. The intermediate pressure is important for the system performance and the optimum value is 2.27 kPa in the PM-1 and 2.5 kPa in the SM. For the PM-2, the intermediate pressure should be chosen to achieve low circulation ratio in the low pressure cycle.