部分互溶的R32-润滑油混合物核态沸腾中分层与换热特性
摘要：在空调器中采用与制冷剂部分互溶的润滑油代替现有完全互溶的润滑油，能避免制冷剂循环量不足的问题，前提是掌握部分互溶的润滑油对沸腾换热的影响。本文针对空调器中广泛使用的制冷剂R32,搭建可视化的沸腾换热特性测试实验台，观测混合物分层现象并测定换热系数。实验结果表明：部分互溶混合物随润滑油质量分数增大先后经历均一混合、分层、均一混合状态；换热系数随时间先不变后减小，减小时刻随热流密度和初始润滑油质量分数增大、初始液相高度减小而提前；平均换热系数随热流密度增大而增大，受初始润滑油质量分数和液相高度的影响可忽略不计；热流密度从5 kW/m2增大至15 kW/m2,平均换热系数增大118.3%。
关键词：R32部分互溶润滑油核态沸腾分层换热特性
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[2] 卢雄标.制冷空调压缩机润滑油添加的新方法[J].暖通空调，2005,35(2):138- 140.
[3] 王宝龙，张朋磊.润滑油对冷水机组性能的影响(3):润滑油对满液式冷水机组性能的定量影响[J].暖通空调，2016,46(E11):4- 7.
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[6] 胡海涛，黄翔超，丁国良，等.小管径强化管内R410A-油混合物流动沸腾阻力特性[J].上海交通大学学报，2010,44(10):1317- 1321.
[7] 胡海涛.R410A-润滑油混合物管内流动沸腾换热和压降特性的研究[D].上海：上海交通大学，2008:42- 48.
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[12] 唐亚林，舒碧芬，杨瑞林.R32家用变频空调器制冷剂充注量优化[J].制冷与空调，2018,18(6):37- 40.
[13] 金梧凤，贾利芝，张燕.空调送风速度和送风角度对可燃性冷媒R32泄漏扩散规律的影响[J].化工学报，2015,66(6):2351- 2358.
[14] JIA L Z,JIN W F,ZHANG Y.Analysis of indoor environment safety with R32 leaking from a running air conditioner[J].Procedia engineering,2015,121:1605- 1612.
[15] HE J J,LIU J P,XU X W.Analysis and experimental study of the heterogeneous nucleation process in the boiling of mixed refrigerants[J].International journal of heat and mass transfer,2017,115:1149- 1160.
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[19] HAHNE E,NOWORYTA A.Calculation of heat transfer coefficients for nucleate boiling in binary mixtures of refrigerant-oil[J].International communications in heat and mass transfer,1984,11(5):417- 427.
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Stratification and heat transfer characteristics of partially miscible R32-lubricating oil mixtures during nucleate boiling
Abstract: Applying partially miscible lubricating oil instead of completely miscible lubricating oil in room air conditioners is a promising way to avoid refrigerant insufficiency. The application of partially miscible lubricating oil to air conditioners requires the clarity of the effect of partially miscible lubricating oil on the nucleate boiling characteristics. In the study, an experiment rig for R32 with a visualization feature is built to test the heat transfer performance of the mixture, including the observation of stratified layers and the measurement of heat transfer coefficients. The test results indicate that, with the increase of oil mass fraction, partially miscible mixtures firstly are homogeneous, then stratify into two layers, finally become homogeneous. The heat transfer coefficients firstly keep steady and then decrease sharply. The moment of decreasing is advanced with the increase of heat flux and initial oil mass fraction, or the decrease of the initial height. The average heat transfer coefficient increases with the increase of the heat flux, and the effects of the initial oil mass fraction and the initial height on the average heat transfer coefficient can be ignored. The average heat transfer coefficient increases by 118.3% as the heat flux increases from 5 kW/m2 to 15 kW/m2.
Keywords: R32; partially miscible; lubricating oil; nucleate boiling; stratification; heat transfer characteristic;
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