R410A/润滑油混合物在5mm铜管内流动冷凝传热特性与理论预测模型研究  

Study on R410A/Lubricating Oil Mixture′s Flow Condensation Heat Transfer Characteristics in 5 mm Copper Tube and Theoretical Prediction Model

作　　者：姜林林 沈志华 蒋金周[1] JIANG Lin-lin;SHEN Zhi-hua;JIANG Jin-zhou(School of Electric and Information Engineering,Nantong Vocational University,Nantong,China,Post Code:226500)

机构地区：[1]南通职业大学电子信息工程学院,江苏南通226500

出　　处：《热能动力工程》2022年第4期130-136,共7页Journal of Engineering for Thermal Energy and Power

基　　金：江苏省高等学校自然科学研究面上项目(20KJB470019);南通职业大学校重点基金(19BK03)。

摘　　要：针对润滑油冷凝性能影响分析不足以及理论预测模型对小管径冷凝传热系数预测精度低的问题,对R410A/润滑油混合物在5 mm水平强化管内流动冷凝传热特性进行了实验研究,探究了质量流率、干度和润滑油质量分数3个参数对冷凝传热性能的影响。实验工况:质量流率为200,300和400 kg/(m^(2)·s),干度为0.1~0.9,润滑油质量分数为0,1%,3%和5%。实验结果表明:对于混合物,冷凝传热系数随着质量流率的增大而增大,随着干度的增大先增大后减小,润滑油质量分数对冷凝传热特性具有重要影响;基于实验数据和理论分析对理论预测模型进行了修正,修正后的模型在±15%误差带内预测精度比达到94.6%。In view of the insufficient analysis of the influence of lubricating oil on the condensation performance and the low accuracy of the theoretical prediction model on the condensation heat transfer coefficient of small pipe diameter,the experimental study on the flow condensation heat transfer characteristics of R410 A/lubricating oil mixture in a 5 mm horizontally enhanced tube was carried out to investigate the influence of mass flow rate,vapor quality and lubricating oil mass fraction on the condensation heat transfer performance.The conditions of the experiment are as follows:mass flow rates of 200,300 and 400 kg/(m^(2)·s),vapor qualities of 0.1 to 0.9,lubricating oil mass fractions of 0,1%,3%and 5%.The research results show that the condensation heat transfer coefficient increases with the increase of mass flow rate for the mixture,which firstly increases and then decreases with the growth of vapor quality,lubricating oil mass fraction has a key impact on the condensation heat transfer characteristics.On the basis of the experimental data and theoretical analysis,it makes the modification on the theoretical prediction model,in the error band of±15%,the prediction accuracy ratio of the modified model reaches 94.6%.

关 键 词：R410A/润滑油 冷凝传热 理论预测模型 预测精度 

分 类 号：TK172[动力工程及工程热物理—热能工程]