R404A直接接触凝结制冷循环的性能分析  

Analysis on performance of R404A direct contact condensation refrigeration cycle

作　　者：宁静红[1] 诸凯[1] 刘圣春[1] 

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134

出　　处：《低温工程》2017年第3期38-42,54,共6页Cryogenics

基　　金：国家自然科学基金(51376137)项目资助

摘　　要：提出R404A直接接触凝结换热的制冷循环,分析R404A直接接触凝结制冷循环的热力性能,并与常规双级压缩制冷循环的性能进行对比。得出结论:在一定的冷凝温度、蒸发温度和过冷液体的过冷度下,直接接触凝结制冷循环存在最佳的饱和液体温度,并在此最佳的饱和液体温度下,获得最优的性能和最小的冷凝热负荷,随着过冷液体的过冷度增大和蒸发温度升高,直接接触凝结制冷循环的性能系数增加、冷凝热负荷减少,获得最优性能的最佳饱和液体温度值提高。过冷液体的过冷度为25℃时,直接接触凝结制冷循环的最佳性能系数较双级压缩制冷循环的最佳性能系数提高6.2%。直接接触凝结制冷循环的最小冷凝热负荷较双级压缩制冷循环的最小冷凝热负荷减小1.8%。The direct contact condensation refrigeration cycle of R404A is designed. The thermal per- formances of this R404A direct contact condensation refrigeration cycle are analyzed and compared with that of convention two stage compression refrigeration cycle. It is found that at a certain evaporating temperature, condensation temperature and super cooling degree of supercooled liquid, direct contact condensation refrig- eration cycle has the optimum saturated liquid temperature. At the optimum saturated liquid temperature, the coefficient of performance （COP） of the direct contact condensation refrigeration cycle reaches the maxi- mum and the condenser heat load is the minimum. With the increasing of the super cooling degree of super- cooled liquid and evaporating temperature, the coefficient of performance （COP） of direct contact conden- sation refrigeration cycle increases, the condenser heat load reduces, and the optimum saturated liquid tem- perature（ at that temperature the maximum performance is obtained）rises, when the super cooling degree of supercooled liquid is 25℃ , compared with that of conventional two stage compression refrigeration cycle, the maximum coefficient of performance （COP） of direct contact condensation refrigeration cycle increases by 6.2% , the minimum condenser heat load of direct contact condensation refrigeration cycle reduces by 1.8%.

关 键 词：R404A 直接接触凝结 制冷循环 热力性能 

分 类 号：TB61[一般工业技术—制冷工程] TB663