CO2跨临界热泵系统的优化与实验研究  

Optimization and Experimental Study on Transcritical CO_2 Heat Pump System

作　　者：杨俊兰[1,2] 马一太[1] 冯刚[3] 李敏霞[1] 

机构地区：[1]天津大学,天津300072 [2]天津城市建设学院,天津300384 [3]河北沧州大化集团公司,河北沧州061000

出　　处：《流体机械》2009年第1期53-58,共6页Fluid Machinery

基　　金：国家自然科学基金项目(50506019);天津市高等学校科技发展基金项目(20071116)

摘　　要：为了提高CO2跨临界循环的性能,对系统每个部件以及整个系统的优化研究是非常必要的。因此提出了以基于系统的优化目标函数对CO2换热器的结构敏感性进行优化计算,分析了优化目标函数COPm随气体冷却器和蒸发器管径和管长的变化。计算结果表明,CO2跨临界循环系统应选择小管径和长管长。同时对优化后的新系统进行了模拟计算,其COP和制冷量分别比原系统提高了15%和18%。根据优化结果以及原有系统存在的问题,对换热器及相关部件进行了设计加工,进而建立了新的CO2跨临界水水热泵实验系统。结果显示,新系统的COP和制冷量提高了30%左右。总之,实验测试数据验证了模拟计算结果的正确性,所得结果有助于对CO2跨临界水-水热泵系统进行改善。In order to improve the performance of the CO2 transcritical cycle, it is necessary to optimize each components and the whole system. So the majorized object function is brought forward to analyze the structure sensitivity for the CO2 heat exchangers. And the variation trend of the majorized object function COPm with tube diameter and tube length of the gas cooler and evaporator is analyzed. The majorized computation resuhs based on the system show that the small diameter tube and long tube length should be selected in the CO2 transcritical cycle. And the simulation results of the new majorized system indicate that the COP and the cooling capacity are increased on average 15% and 18%, respectively. Based on the optimization results and some existing problems in the primary system, the new heat exchangers and some related components are designed and manufactured in order to achieve rational structure and high efficiency operation, and then the new CO2 transcritical water-to-water heat pump system is set up. The experimental results show that the coefficient of performance and the cooling capacity of the new system are increased on average 30% or so. The optimization results are verified by the experimental results and the optimization object is achieved.

关 键 词：CO2 跨临界循环 优化 实验研究 

分 类 号：TB6[一般工业技术—制冷工程]