流体机械

2009, v.37;No.439(01) 53-58

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CO_2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

杨俊兰;马一太;冯刚;李敏霞;
YANG Jun-lan1,2,MA Yi-tai1,FENG Gang3,LI Min-xia1(1.Tianjin University,Tianjin 300072,China;2.Tianjin Institute of Urban Construction,Tianjin 300384,China;3.Hebei Cangzhou Dahua Group Company,Cangzhou 061000,China)

摘要(Abstract):

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 results 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(KeyWords): CO2;跨临界循环;优化;实验研究
carbon dioxide;transcritical cycle;optimization;experimental study

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基金项目(Foundation): 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)

作者(Author): 杨俊兰;马一太;冯刚;李敏霞;
YANG Jun-lan1,2,MA Yi-tai1,FENG Gang3,LI Min-xia1(1.Tianjin University,Tianjin 300072,China;2.Tianjin Institute of Urban Construction,Tianjin 300384,China;3.Hebei Cangzhou Dahua Group Company,Cangzhou 061000,China)

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