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首页> 外文期刊>Journal of Heat Transfer >Heat Transfer Coefficients During Condensation of the Zeotropic Refrigerant Mixture HCFC-22/HCFC-142b
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Heat Transfer Coefficients During Condensation of the Zeotropic Refrigerant Mixture HCFC-22/HCFC-142b

机译：共沸混合制冷剂HCFC-22 / HCFC-142b冷凝过程中的传热系数

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摘要

Heat transfer coefficients during condensation of zeotropic refrigerant mixtures were obtained at mass fractions of 90 percent/10 percent, 80 percent/20 percent, 70 percent/30 percent, 60 percent/40 percent, and 50 percent/50 percent for HCFC-22/HCFC-142b and for pure HCFC-22 in a horizontal smooth tube at a high saturation pressure of 2.43 MPa. The measurements were taken in a series of eight 8.11 mm inner diameter smooth tubes with lengths of I 603 mm. At low mass fluxes, from 40 kg/m~2s to 350 kg/m~2s where the flow regime is predominately stratified wavy, the refrigerant mass fraction influenced the heat transfer coefficient by up to a factor of two, decreasing as the mass fraction of HCFC-l42b is increased. At high mass fluxes of 350 kg/m~2s and more, the flow regime was predominately annular and the heat transfer coefficients were not strongly influenced by the refrigerant mass fraction, decreasing only by 7 percent as the refrigerant mass fraction changed from 100 percent HCFC-22 to 50 percent/50 percent HCFC-22/HCFC-142b. The results also indicated that of three methods tested to predict heat transfer coefficients, the flow pattern correlation of Dobson and Chato (1998) gave the best results for pure HCFC-22 and for the mixtures utilizing the Silver-Bell-Ghaly method (1964).
机译：在HCFC-22 /的共沸制冷剂混合物冷凝期间，传热系数的质量分数为90％/ 10％，80％/ 20％，70％/ 30％，60％/ 40％和50％/ 50％。 HCFC-142b和纯HCFC-22在水平饱和管中处于2.43 MPa的高饱和压力下。在一系列八个长度为I 603 mm的内径8.11 mm光滑管中进行测量。在从40 kg / m〜2s到350 kg / m〜2s的低质量通量下，流态主要为波浪状，制冷剂的质量分数对传热系数的影响最大为2，随着质量分数的降低而降低。 HCFC-142b的含量增加。在350 kg / m〜2s或更高的高质量通量下，流动状态主要是环形的，并且传热系数不受制冷剂质量分数的强烈影响，当制冷剂质量分数从100％HCFC变化时，制冷剂质量分数仅降低7％。 -22％至50％/ 50％HCFC-22 / HCFC-142b。结果还表明，在测试三种预测传热系数的方法中，Dobson和Chato（1998）的流型相关性对于纯HCFC-22和利用Silver-Bell-Ghaly方法（1964）的混合物给出了最佳结果。 。

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