一种新型混合吸收式制冷循环的性能分析

THE PERFORMANCE OF A NOVEL MIXED ABSORPTION REFRIGERATION CYCLE

该文提出一种新型吸收式循环 ,可以较好利用太阳能实现制冷 ,解决传统吸收式系统在利用太阳能实现制冷时存在的弊端。这种新型混合式吸收式制冷循环在两级吸收式循环的基础上增设了一个附加高压发生器 ,发现影响系统COP值的因素主要是LiBr溶液浓度与低压发生器中的压力。在溶液浓度与压力的允许范围内时 ,新型循环的高压发生器再生出LiBr溶液与低压吸收器的吸收后的溶液混合 ,提高高压吸收器吸收剂浓度从而减小其压力。本文主要分析了混合吸收式制冷循环的各种性能特性 ,得出影响系统热力系数 (COP)可达 0 .5 5 ,驱动热源的可利用温差最高可达 35℃。

A novel refrigeration cycle of solar lithium bromide water absorption has been studied.Which is suited to solar air condition system and can resolve the disadvantages of traditional solar lithium bromide water absorption system.The additional high pressure generator has been used in the cycle.The lithium bromide solution flowing out from the high pressure generator was mixed with solution from low pressure absorber in order to increase lithium bromide solution concentration and decrease the pressure in the high pressure absorber. The performance of the cycle was analyzed and it can draw that the solution concentration and pressure in low pressure absorber are main factors that influence performance of the cycle. In the proper ranges of solution concentration and pressure,the highest COP was 0.55 and the highest available temperature difference of heat resource was 35℃.The advantages of solar air conditioner can be exerted by the cycle.