氨水吸收/压缩复合循环中间压力计算方法讨论  

Discussion on Computational Method of Intermediate Pressure in Ammonia-water Absorption/compression Refrigeration Cycle

作　　者：鄂文汲[1] 杜垲[1] 李舒宏[1] 鲍帅阳[1] 

机构地区：[1]东南大学能源与环境学院

出　　处：《建筑热能通风空调》2016年第1期5-8,34,共5页Building Energy & Environment

基　　金：国家自然科学基金(No.51176029)

摘　　要：本文对氨水吸收/压缩复合制冷循环进行分析,结合Schulz氨水溶液状态方程,对压缩机处于低压区的复合循环进行热力计算。分析蒸发温度、热源温度、冷却水温度和中间压力对该复合式循环的性能影响,在此基础上得到不同中间压力对应的系统性能系数及各类热负荷,并将最高系统性能系数所对应的中间压力与两级压缩中间压力的计算公式进行比较,给出该复合循环最佳中间压力的取值范围。结果表明,在双级压缩中间压力公式对应的压力值后,增大压力,对系统性能系数的影响较小。因此,双级压缩中间压力计算公式也适用于氨水吸收/压缩制冷循环中间压力的确定。Absorption/compression refrigeration cycle has been analyzed using the Schulz state equation of ammonia-water solution, and theoretical calculations have been done on the combined cycle where the compressor is added in low-pressure area. Through calculations, the influences of evaporation temperature, heat-source temperature,cooling water temperature and the intermediate pressure have on system performance were analyzed, and the system coefficient of performance（COP） and heat load were attained. Comparing the maximum COP with result obtained by intermediate pressure method in two-stage compression refrigeration cycle, the span of optimum intermediate pressure in absorption/compression refrigeration cycle was acquired. Result shows that, raising pressure after the value got by intermediate pressure method in two-stage compression refrigeration cycle has little effect on system COP, so, the intermediate pressure method is also applicable for the decision of optimum intermediate pressure in absorption/compression refrigeration cycle.

关 键 词：吸收压缩 中间压力 系能系数 复合制冷 

分 类 号：TB657[一般工业技术—制冷工程]