太阳能1.x级溴化锂吸收式制冷循环性能分析

Performance of 1.x-lift LiBr absorption refrigeration cycle driven by solar energy

介绍了一种适合于太阳能和其他低温热源利用的新型1.x级溴化锂吸收式制冷循环.通过编制计算机程序模拟计算表明循环热力系数和面积单耗都随循环中间压力升高而增大,且达到一定数值时循环将不能继续;冷却水先进入冷凝器的串联流程优于并联流程;随着热水或冷媒水温度的降低或冷却水温度的升高,溴冷机循环系统的热力系数、面积单耗等经济性指标都变差,但在现有太阳能集热器能提供的热水温度范围内,1.x级循环的性能指标明显高于两级循环.

A 1.x-lift LiBr absorption refrigeration cycle suitable for utilization of solar energy and other low temperature heat sources is presented. Simulating calculation was conducted with a set of computer programs. The results show that the coefficient of performance of the cycle and the unit heat transfer surface area rises with the increase of medium pressure of the cycle, but the circulation will stop when the medium pressure reaches a certain value. The series loop of cooling water with condenser first is superior to parallel loop of cooling water. The cycle indices such as coefficient of performance, unit heat transfer surface area, and unit hot water consumption deteriorate with the decrease of the temperatures of hot water or medium water, or the increase of the temperature of cooling water. However, within the available temperature range of conventional solar energy collectors, the performance indices of 1.x-lift cycle are far better than those of 2-lift cycle.