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现行 2877(RP-221)
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An Experimental Investigation of Heat Transfer in Forced Convection Condensation of Oil-Refrigerant Mixtures 油-制冷剂混合物强制对流冷凝传热的实验研究
本文对油制冷剂(R-12)混合物在水平管内的强制对流冷凝传热系数进行了实验测量。根据这些测量结果,建立了一个关联式,用于预测各种参数的传热系数。参数范围如下:质量通量为7×1047×105lbm/hr·ft²(3.4×1053.4×106kg/hr·m²),热通量为1100至22000 Btu/hr·ft²(3.5×10³至6.9×104W/m²),蒸汽质量为0.2至0.8,冷凝压力为70至135 psia(绝对压力为0.48至0.93 MPa),油分数为0%、2%和5%。与实验数据的对比表明,82%的数据在±20%范围内。 引用:ASHRAE Transactions,1985年,第91卷,第1部分。伊利诺伊州芝加哥1A
Experimental measurements of heat transfer coefficient have been made for forced-convection condensation of oil-refrigerant (R-12) mixtures inside a horizontal tube. From these measure­ments, a correlation is developed to predict heat transfer coefficient for a wide range of parameters. The range of parameters is as follows: mass flux from 7 × 104to 7 × 105lbm/hr·ft2(3.4 × 105to 3.4 × 106kg/hr·m2), heat flux from 1100 to 22,000 Btu/hr·ft2(3.5 × 103to 6.9 × 104W/m2), vapor qualities from 0.2 to 0.8, condensing pressures from 70 to 135 psia (0.48 to 0.93 MPa absolute), and oil fractions of 0, 2, and 5%. Comparison of the proposed correlation with experimental data shows that 82% of the data are within ±20%.
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