流体机械

2014, v.42;No.510(12) 59-63

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CO_2气体冷却器的性能分析与试验研究
Performance Analysis and Experimental Study for CO_2 Gas Cooler

杨俊兰;苗国伟;姚钼超;
YANG Jun-lan;MIAO Guo-wei;YAO Mu-chao;Tianjin Chengjian University;

摘要(Abstract):

CO2气体冷却器的型式和换热效果对CO2跨临界循环的性能影响较大,有必要对其换热性能进行分析。通过对气体冷却器划分微元,建立了传热过程计算模型,用间接法计算了划分微元与不划分微元时CO2侧冷却换热系数,并与几个所选换热关联式的计算值进行了比较,结果发现划分微元时的值几乎都高于关联式计算值。综合分析选择了较合适的换热关联式,为系统及气体冷却器的模拟优化提供了依据。进而新建了CO2热泵实验台,对新气体冷却器的性能进行了测试和比较。结果表明,新CO2气体冷却器的性能比原换热器有了大幅提高。通过优化达到了改善换热器和系统性能的目的。
Types and heat transfer effects of CO2 gas cooler have greater impact on the performance of the CO2 transcritical cycle.Therefore,it is necessary to analyze its heat transfer performance.By being divided infinitesimal units for gas cooler,a computational model was established for the heat transfer process.And the cooling heat transfer coefficient of CO2 side was calculated by using the indirect method for dividing and non-dividing infinitesimal.The obtained results were compared with the calculated values from the several selected heat transfer correlations.The results showed that the values from the divided infinitesimal were almost higher than those from the correlations.By comprehensive analysis,an appropriate heat transfer correlation was chosen to provide the basis for system and the gas cooler simulation and optimization.Then a new CO2 heat pump test rig is built,and the performance of the new gas cooler was tested and compared.The results showed that the new CO2 gas cooler performance has been greatly improved over the original heat exchanger.The purpose of improving the heat exchanger and the system performance is achieved through optimization.

关键词(KeyWords): 跨临界;CO2气体冷却器;传热系数;关联式
transcritical;CO2 gas cooler;heat transfer coefficient;correlation

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基金项目(Foundation): 天津市科委应用基础及前沿技术研究计划项目(10JCYBJC08300

作者(Author): 杨俊兰;苗国伟;姚钼超;
YANG Jun-lan;MIAO Guo-wei;YAO Mu-chao;Tianjin Chengjian University;

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