摘要
为研究制冷剂R32在铝制人字纹管、涟漪纹管以及光滑管中冷凝换热和压降特性,本文通过高精度多工质蒸发冷凝实验台在R32质量流速为100~350 kg/(m^(2)·s),饱和温度为308、313、318 K,干度范围为0.2~0.8工况下,进行冷凝实验研究。实验结果表明:人字纹管的传热系数最高,涟漪纹管次之,光滑管最低。涟漪纹管的摩擦压降最高,人字纹管略高于光滑管,表面传热系数和摩擦压降随饱和温度的升高而减小,随质量流速的升高而增大。引入评价因子P EF评价换热管的换热性能:人字纹管的换热性能最好,P EF范围为2.07~2.72,涟漪纹管的P EF范围为0.68~0.90。在换热关联式的基础上进行改进,提出了适用于本次实验的换热关联式,改进后的关联式误差在±20%以内。
Experiments were conducted to study the condensation heat transfer and pressure drop characteristics of refrigerant R32 in aluminum herringbone tubes,ripple tubes,and smooth tubes.The experimental refrigerant mass flow rate is 100-350 kg/(m^(2)·s).The saturation temperature is 308 K,313 K,and 318 K,respectively,while the vapor quality is 0.2-0.8.The experimental results show that the herringbone tube has the highest coefficient of heat transfer,followed by the ripple tube,while the smooth tube is the worst.The friction pressure drop is highest for the ripple tube,and the pressure drop of the herringbone tube is higher than that of the smooth tube.The surface coefficient of heat transfer and friction pressure drop decrease with an increasing saturation temperature and increase with an increasing mass flow rate.The performance evaluation factor,P EF,was introduced to evaluate the heat transfer performance of the heat transfer tube.The herringbone tube has the best heat transfer performance with P EF values ranging from 2.07 to 2.72,while the ripple tube has P EF values ranging from 0.68 to 0.90.A new heat transfer correlation was proposed following the form of classical heat transfer correlations,and the error of the new correlation formula was within±20%.
作者
刘相增
冯威
张敢敢
李蔚
项燕龙
张江辉
马连湘
Liu Xiangzeng;Feng Wei;Zhang Gangan;Li Wei;Xiang Yanlong;Zhang Jianghui;Ma Lianxiang(College of Mechanical and Electrical Engineering,Qingdao University of Science and Technology,Qingdao,266061,China;College of Energy Engineering,Zhejiang University,Hangzhou,310027,China;Ningbo Jintian Copper Tube Co.,Ltd.,Ningbo,315000,China)
出处
《制冷学报》
CAS
CSCD
北大核心
2023年第4期51-59,84,共10页
Journal of Refrigeration
基金
国家自然科学基金(52076187)资助项目。
关键词
冷凝换热
表面传热系数
摩擦压降
换热关联式
condensation heat exchange
surface coefficient of heat transfer
frictional pressure drop
heat transfer correlation
