变流量二次节流中间完全冷却实验研究  

Experimental study on complete intermediate cooling with variable flow secondary throttle

作　　者：蒋春艳 杨永安 刘永超 罗建成 Jiang Chunyan;Yang Yongan;Liu Yongchao;Luo Jiancheng(Refrigeration Engineering Research Center of Ministry of Education,Tianjin Refrigeration Engineering Technology Center,Tianjin University of Commerce,Tianjin 300134,China)

机构地区：[1]天津商业大学,冷冻冷藏技术教育部工程研究中心,天津市制冷技术工程中心,天津300134

出　　处：《低温与超导》2018年第11期77-81,共5页Cryogenics and Superconductivity

摘　　要：为了探究二次节流中间完全冷却的双级压缩系统在低温工况下的运行特性,在冷凝温度tk为30℃,蒸发温度t0为-40℃^-20℃的工况下,分析二次节流中间完全冷却系统的循环特性。实验结果表明,系统的中间压力和蒸发压力均随着蒸发温度的升高而增大,蒸发温度对系统性能的影响较大,系统COP也随蒸发温度的升高而增大;固定系统工况时,系统的高低压流量比随中间压力的增大而缓慢减少,同时,随着高低压流量比的缓慢减少,系统COP一定范围内呈现出先增大后减小的变化趋势。故对于固定工况条件下的变流量二次节流中间完全冷却制冷系统,存在一个高低压流量比,在该高低压流量比下系统运行的COP达到最优。In order to explore the operating characteristics of the double stage compression system with two throttling inter- mediate cooling at low temperature, the cycle characteristics of the two total cooling systems were analyzed at the condensing tem- perature of tk = 30℃ and the evaporation temperature of to = -40℃-20℃. The experimental results show that the intermediate pressure and the evaporation pressure of the system increase with the increase of the evaporation temperature. The evaporation temperature has a great influence on the system performance, and the system COP also increases with the increase of the evapora- tion temperature. With the slow reduction of the high and low pressure flow ratio, the system COP shows a trend of first increase and then decrease within a certain range. Therefore, there is a high and low pressure flow ratio for the complete cooling in the two throttling system with variable flow rate under the fixed condition, and the system operating at the high and low pressure flow ratio reaches the best COP.

关 键 词：二次节流 双级压缩 中间压力 中间温度 COP 

分 类 号：TB657[一般工业技术—制冷工程]