新型太阳能降压吸收式制冷空调系统特性的理论分析  

Theoretical Analysis on Characteristics of a New Type of Absorption Refrigeration Cycle for Solar Air-conditioning

作　　者：万忠民[1] 杜健嵘[1] 舒水明[2] 胡兴华[2] 

机构地区：[1]湖南理工学院,岳阳414006 [2]华中科技大学,武汉430074

出　　处：《制冷学报》2007年第1期49-53,共5页Journal of Refrigeration

摘　　要：在两级溴化锂吸收式制冷的基础上提出了一种新型高效的降压吸收式制冷循环,能够有效利用太阳能实现制冷,解决传统吸收式太阳能空调系统存在的弊端。其特点是在传统的两级吸收式循环的基础上,将高压发生器发生出的LiBr溶液与低压吸收器的吸收后的溶液混合,在发生温度与压力允许的范围内,使高压吸收器的吸收剂浓度较两级吸收式循环高,从而在相同的冷凝条件下减小了其压力。分析了新型空调系统的性能特性,理论计算结果表明影响新型系统整体效率的主要因素是LiBr溶液的浓度及驱动热源的可利用温差。新型吸收式循环热源可利用温差最高可达33.5℃,整体效率比两级吸收式系统有较大提高,最大提高46.4%,其集热面积单耗最大减小47.1%,热源单耗是两级系统的0.21,效果较明显。A novel lower pressure absorption refrigeration cycle for solar air - conditioning was presented. On the basis of the conventional two - stage absorption refrigeration cycle, the lithium bromide solution from the high pressure generator was mixed with solution from low pressure absorber to increase lithium bromide solution concentration and reduce the pressure in the high pressure absorber. The performance of the new cycle for solar air - conditioning was analyzed. The results show that the whole coefficient of performance of the new cycle for air - conditioning was mainly influenced by LiBr solution concentration and available temperature difference of heat resource. The highest available temperature difference of heat resource was 33.2℃. The maximum whole coefficient of performance was 46.4% higher than that of conventional two - stage absorption refrigeration cycle. Moreover, the area of solar collector decreased by 47. 1 % and unit hot water consumption reduced to 21% at the same cooling capacity.

关 键 词：热工学 吸收式制冷 理论分析 太阳能 热源可利用温差 整体效率 

分 类 号：TB616[一般工业技术—制冷工程]