高/低压区氨水吸收/压缩复合制冷循环性能分析  

Performance Analysis of Ammonia-water Absorption/Compression Combined Refrigeration Cycle with Compressor Set on High/Low Pressure Areas

作　　者：鲍帅阳[1] 杜凯[1] 储云霄[1] 武云龙[1] 鄂文汲[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《制冷技术》2014年第3期42-48,共7页Chinese Journal of Refrigeration Technology

基　　金：国家自然科学基金(51176029)

摘　　要：针对氨水吸收/压缩复合制冷循环的方式不同,结合Schulz氨水溶液状态方程,分别对压缩机处于系统高压区和低压区两种不同的组合方式进行了理论分析计算。分析了蒸发温度、热源温度、冷却水温度和中间压力对两种组合方式下压缩机当量热耗量和热源耗热量的影响,并与单级氨水吸收制冷循环的性能系数做了比较。结果表明,压缩机当量热耗量对循环性能的影响要低于热源耗热量的影响;压缩机处于系统高压区时循环的一次用能量要明显高于压缩机处于系统的低压区;在中间压力给定时,存在一个最佳热源温度,使得氨水吸收/压缩复合制冷循环的性能系数取得最大值;随任一温度参数变化时,压缩机处于高压区时的性能系数总会出现低于单级氨水吸收循环性能系数的临界点;而压缩机处于系统低压区时循环的性能系数要高于高压区循环和单级氨水吸收循环。In view of the different ways in the ammonia-water absorption/compression combined refrigeration （AWA/CCR） cycle, combining the Schulz state equation of the ammonia-water solution, the theoretical analysis and calculations on two combination ways, by adding the compressor in the high-pressure area and in the low-pressure area, are conducted, respectively. The effects of several factors, including the evaporation temperature Te, heat-source temperature Th, the cooling water temperature Tw and intermediate pressure, on the equivalent heat consumption in compression qcw and heat consumption in heat-source q6, are analyzed under the two combined configurations , and compared with the the single-stage ammonia-water absorption cycle on coefficient of performance （COP）.The results show that the effect of the equivalent heat consumption in compression on COP is less than that of the heat consumption in heat-source. Besides, the compressor set in the high-pressure area uses more energy than that in the low-pressure area. Under the given intermediate pressure, there is an optimum heat-source temperature corresponding to the maximum COP of the AWA/CCR cycle. With any temperature parameter changes, it always exits a critical point in which the COP of the combined refrigeration cycle with the compressor set in high-pressure area lower than that of the single-stage ammonia-water absorption cycle. Moreover, the compressor in the low-pressure area is superior to that in the high-pressure area and that in the single-stage ammonia-water absorption cycle with respect to the COP.

关 键 词：氨水吸收式 压缩式制冷 复合制冷循环 性能系数 

分 类 号：TB657[一般工业技术—制冷工程]