R245fa在低肋管管外沸腾换热的试验研究  

Experimental study on boiling heat transfer of R245fa outside low-fin tube

作　　者：杜振兴 李宜豪 孙天宇 杨云航 DU Zhenxing;LI Yihao;SUN Tianyu;YANG Yunhang(Energy Equipment Department,Shanghai Marine Diesel Engine Research Institute,Shanghai 201108,China)

机构地区：[1]中国船舶集团有限公司第七一一研究所能源装备事业部,上海201108

出　　处：《热科学与技术》2024年第1期30-36,共7页Journal of Thermal Science and Technology

摘　　要：针对R245fa工质在大型蒸发器中低肋管的管外沸腾换热性能开展了试验研究。根据蒸发压力分别在0.88、0.78和0.68 MPa时的试验结果,通过威尔逊图解法得到相应的传热关联式,并将结果与文献进行比较。试验结果表明,在热流密度约23 000~32 000 W/m^(2)时,R245fa管外沸腾传热系数可以达到11 000~18 000 W/(m^(2)·K)。在实验条件范围内,管外传热系数随蒸发压力的升高而增大,随热流密度的增大而增大,相对于文献中光管的传热系数预测值的强化倍率约为2.800倍。此外,还给出了低肋管管外沸腾换热的传热关联式,以及Cooper关联式和Gorenflo关联式用于低肋管时所需增加的修正系数。Experimental research was conducted on the external boiling heat transfer performance of low-fin tubes using R245fa in a large-scale evaporator.Based on the experimental results at evaporating pressures of 0.88,0.78 and 0.68 MPa,the corresponding heat transfer correlations were obtained using the Wilson plot method,and the results were compared with those in the literature.The experimental results showed that the external boiling heat transfer coefficient of R245fa could reach 11000~18000 W/(m^(2)·K)at a heat flux density of about 23000~32000 W/m^(2).Within the range of experimental conditions,the external heat transfer coefficient increased with the increase of evaporating pressure and heat flux density,and the enhancement ratio is about 2.800 times compared with the predicted value of the smooth tube heat transfer coefficient in the literature.In addition,the heat transfer correlation for external boiling of low-fin tubes was given under experimental condition,as well as the correction factors required for the Cooper and Gorenflo correlations to be used for low-fin tubes in this form.

关 键 词：管外沸腾 低肋管 R245FA 大型蒸发器 

分 类 号：TK123[动力工程及工程热物理—工程热物理]