超临界二氧化碳冷却器中间分流优化设计  

Optimal Design of Intermediate Flow Division in Supercritical Carbon Dioxide Coolers

作　　者：蔡浩飞 梁世强[1,2] 姜玉雁 王涛[1,2] 朱玉铭 CAI Hao-Fei;LIANG Shi-Qiang;JIANG Yu-Yan;WANG Tao;ZHU Yu-Ming(Institute of Engineering Thermophysics,Chinese Acadamy of Sciences,Beijing 100190,China;University of Chinese Acadamy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《工程热物理学报》2021年第6期1499-1506,共8页Journal of Engineering Thermophysics

基　　金：中国科学院洁净能源先导科技专项资助(No.XDA21010201);国家自然科学基金资助项目(No.51876203)。

摘　　要：基于超临界二氧化碳毛细管冷却器的设计,对冷却器内部的夹点问题、温差均匀性及(火积)耗散率进行了分析。提高冷却水流量和降低冷却水入口温度能够有效避免夹点传热恶化。水流量和二氧化碳流量不匹配会造成冷却器内部温差分布不均匀,增大传热不可逆损失。中间分流措施能够在原有换热器的基础上,通过改变局部水流量分布,提高冷却器内部温差分布均匀性,降低换热器(火积)耗散率。The pinch point,the uniformity of temperature difference field(TDF)and the entransy dissipation rate in the cooler are analyzed based on the design of the supercritical carbon dioxide microtube cooler.Increasing the flow rate and lowering the inlet temperature of the cooling water can effectively avoid the heat transfer deterioration at the pinch point.Mismatch between water flow and carbon dioxide flow will cause uneven temperature distribution inside the cooler and increase the irreversible heat transfer loss.Intermediate flow diversion measures can improve the uniformity of the temperature difference distribution in the cooler and reduce the entransy dissipation rate of the heat exchanger by changing the local water flow distribution on the basis of the original design of the heat exchanger.

关 键 词：毛细管换热器 夹点 温差不均匀因子 (火积)耗散率 中间分流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]