Flow Boiling Heat Transfer and Pressure Gradient of R410A in Micro-Channel Flat Tubes at 25℃ and 30℃  

作　　者：Bo Yu Yuye Luo Luyao Guo Long Huang 

机构地区：[1]State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation,Zhuhai,519070,China [2]Guangdong Key Laboratory of Refrigeration Equipment and Energy Conservation Technology,Zhuhai,519070,China [3]Gree Electric Appliances,Inc.,Zhuhai,519070,China [4]School of Intelligent Manufacturing Ecosystem,Xi’an Jiaotong-Liverpool University,Suzhou,215123,China

出　　处：《Frontiers in Heat and Mass Transfer》2025年第2期553-575,共23页热量和质量传递前沿(英文)

基　　金：supported by the National Natural Science Foundation of China(Grant No.52306026);the State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation Open Project(Project No.ACSKL2021KT01);The APC was covered by the Special Innovation Project Fund of the the State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation Open Project(Project No.ACSKL2021KT01).

摘　　要：This study investigates the flow boiling heat transfer coefficient and pressure gradient of refrigerant R410A inmicro-channel flat tubes.Experiments were conducted at saturation temperatures ranging from 25℃ to 30℃,mass fluxes between 198 and 305 kg/m^(2)s,and heat fluxes from 9.77 to 20.18 kW/m^(2),yielding 99 sets of local heat transfer coefficient data.The results show that increasing heat flux and mass flux enhances the heat transfer coefficient,although the rate of enhancement decreases with increasing vapor quality.Conversely,higher saturation temperatures slightly reduce the heat transfer coefficient.Additionally,the experimental findings reveal discrepancies in the accuracy of existing pressure drop and heat transfer coefficient prediction models under the studied conditions.This study recommends using the Kimand Mudawar correlation to predict pressure gradients within the tested range,with aMean Error(ME)of−5.24%observed in this study.For heat transfer coefficients,the Cooper and Kandlikar correlations are recommended,achieving a Mean Absolute Error(MAE)of approximately 22%.This research provides value for performance prediction and parameter selection of micro-channel technology in broader application scenarios within heating,ventilation and air-conditioning fields.

关 键 词：MICRO-CHANNEL flow boiling heat transfer coefficient pressure gradient R410A 

分 类 号：TK124[动力工程及工程热物理—工程热物理]