CAJ | 학술논문

实验研究了R290、R22在细圆管中的流动凝结换热特性。实验管内径为1.085 mm,R22的质量流率为200~1200 kg/( m2?s),R290的质量流率为200~650 kg/( m2?s),饱和温度分别为40℃与50℃。实验结果表明,高质量流率时R22在较高干度下换热系数随干度增加缓慢或略有下降,低质量流率时,R290在较小干度下出现换热系数下降。两种制冷剂蒸气相比,相同条件下R290的凝结换热系数高于R22的。本文的实验结果还与现有典型关联式的计算结果作了对比,其中,Wang et al.(2002)关联式对R290的实验数据预测偏差在17.5％之内,Kim et al.(2013)关联式对R22的实验数据预测偏差在18.4％之内。
실험연구료R290、R22재세원관중적류동응결환열특성。실험관내경위1.085 mm,R22적질량류솔위200~1200 kg/( m2?s),R290적질량류솔위200~650 kg/( m2?s),포화온도분별위40℃여50℃。실험결과표명,고질량류솔시R22재교고간도하환열계수수간도증가완만혹략유하강,저질량류솔시,R290재교소간도하출현환열계수하강。량충제랭제증기상비,상동조건하R290적응결환열계수고우R22적。본문적실험결과환여현유전형관련식적계산결과작료대비,기중,Wang et al.(2002)관련식대R290적실험수거예측편차재17.5％지내,Kim et al.(2013)관련식대R22적실험수거예측편차재18.4％지내。
The condensation heat transfer characteristics of R290 and R22 were investigated experimentally in a horizontal circular mini-tube with 1. 085 mm diameter. The mass flow rate of R22 is 200-1200 kg/(m2?s), and that of R290 is 200-650 kg/(m2?s). The saturation temperature is 40 ℃ and 50 ℃ respectively during the experiment. The experimental results show that at the higher mass flow rate of R22, the condensation heat transfer coefficient increases slowly or even decreases little with the vapor quality increasing, for the R290 at a less mass flow rate, the heat transfer coefficient will decreases slightly at a low vapor quality. The condensation heat transfer co-efficient of R290 is higher than that of the R22 at the same experimental conditions. The experimental results are also compared with some of the existing correlations, which shows that the Wang et al. (2002) correlation predicts the experimental data of R290 very well ,with an overall mean absolute error of 17. 5%, while Kim et al. (2013) correlation makes the best prediction to the R22’s data, with an overall mean absolute error of 18. 4%.