| 摘要: |
| 本文对2根不同孔径单管在饱和温度为0 ℃、5 ℃和10 ℃工况下进行水平管内R32蒸发换热的实验研究。采用热阻分离法得到管内制冷剂侧蒸发换热系数，以质量流量、饱和温度为影响因子，对实验结果进行单管热阻分析及综合性能评价。结果表明：管内换热系数及压降均随着质量流量的增加而增加，管径对换热系数影响较大，1#换热系数约为2#的1.1~1.3倍，不同质量流量下温度对换热系数及压降的影响比重不同；随着质量流量的增加，管外水侧热阻占总热阻的比例逐渐增大，管内制冷剂侧热阻占总阻值的比例逐渐减；两根单管单位压降换热系数均随质量流量的增加而减小，在不同质量流量下饱和温度对参数的影响比重不同。 |
| 关键词: 蒸发实验 质量流量 饱和温度 热阻分析 综合性能评价 |
| DOI： |
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| 基金项目:上海市动力工程多相流动与传热重点实验室开放基金（13DZ2260900）项目资助。 |
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| Evaporation Heat Transfer of R32 inside Horizontal Tubes |
| Li Qingpu,Tao Leren,Wang Tong,Wu Shengli,Li Lei,Hu Yongpan |
| (Institute of Refrigeration and Cryogenics, University of Shanghai for Science and Technology) |
| Abstract: |
| This paper studies the evaporation heat transfer of R32 inside two different diameters of horizontal tubes under saturation temperatures of 0 ℃, 5 ℃, and 10 ℃. The evaporation heat transfer coefficient of the refrigerant was obtained by using a heat resistance separating method. Taking mass flux and saturation temperature as the influencing factors, the experiment results include two parts：analysis of single-tube thermal resistance and evaluation of single-tube comprehensive performance. The experimental results indicate that the heat transfer coefficient and pressure drop rise as the mass flow rate increases. The diameter has a great influence on the heat transfer coefficient, and the heat transfer coefficient of No.1 is 1.1~1.3 times as that of No.2. The effect of temperature on the heat transfer coefficient and the pressure drop differs under different mass flow rate. As the mass flow rate increases, the proportion of the external water side-tube resistance to the total thermal resistance increases, while that of the inside gradually decreases. The heat transfer coefficient per pressure drop of two single tubes decreases as the mass flow rate increases. The saturation temperature shows various effects on the parameters at different mass flow rate. |
| Key words: evaporating experiment mass flux saturation temperature thermal resistance analysis evaluation of comprehensive performance |
