CO_2跨临界双级压缩带高压膨胀机制冷循环性能研究  

RESEARCH ON THE PERFORMANCES OF CO_2 TRANS-CRITICAL TWO STAGE COMPRESSION REFRIGERATION CYCLE WITH A HIGH PRESSURE EXPANDER

作　　者：谢英柏[1] 孙刚磊[1] 刘春涛[1] 刘迎福[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,保定071003

出　　处：《太阳能学报》2010年第7期829-833,共5页Acta Energiae Solaris Sinica

基　　金：教育部重大项目(306004);中央高校基本科研业务费专项资金(09MG32)

摘　　要：通过建立模型,分析比较了CO_2跨临界双级压缩带节流阀与带高压膨胀机制冷循环的性能。结果表明:双级压缩CO_2跨临界带节流阀与带高压膨胀机制冷循环的最佳中间压力并不是高低压的几何平均值;在一定的气体冷却器出口温度下,双级压缩CO_2跨临界带高压膨胀机制冷循环有一个最佳高压侧排气压力,与带节流阀循环相比,其最大COP可提高10%,但高压侧压力超过最佳值后,高压膨胀机对系统COP的影响逐渐变得不明显;在双级压缩CO_2跨临界带高压膨胀机制冷系统优化设计过程中,中间冷却应采用完全冷却型式。The model of Co2 trans-critical two stage compression refrigeration cycle was presented. The performances of the cycle with a high pressure expander were compared with that of the cycle with throttling valves. Results indicated that the optimal inter-stage pressure in the two-stage compression cycle is not the geometry mean of the low and high pres- sures. At the given outlet temperature of gas cooler, the maximum COP of the cycle with a high pressure expander is about 10% higher than that of the cycle with throttling valves. For the cycle with a high pressure expander, there exits an optimal discharge pressure of the high pressure side, as the discharge pressure exceed the optimal value, the influence of the high pressure expander on the COP is not evident. For the optimization design of the CO2 trans-critical two stage compression refrigeration cycle with a high pressure expander, the complete inter-cooling type should be applied.

关 键 词：CO2跨临界制冷循环 双级压缩 高压膨胀机 性能 

分 类 号：TB61[一般工业技术—制冷工程]