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首页> 外文期刊>International Journal of Refrigeration >Experimental measurements for condensation of downward flowing R123/R134a in a staggered bundle of horizontal low-finned tubes with four fin geometries
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Experimental measurements for condensation of downward flowing R123/R134a in a staggered bundle of horizontal low-finned tubes with four fin geometries

机译：在具有四个翅片几何形状的水平低翅片交错管束中向下流动的R123 / R134a冷凝的实验测量

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摘要

Experiments were conducted to obtain row-by-row heat and mass transfer data during condensation of downward-flowing zeotropic mixture R123/R134a in a staggered bundle of horizontal low-finned tubes. The vapor temperature and the mass fraction of R134a at the tube bundle inlet were about 50℃ and 14%, respectively. The refrigerant mass velocity ranged from 9 to 34 kg m{sup}(-2) s{sup}(-1), and the condensation temperature difference from 1.9 to 12 K. Four kinds of low-finned tubes with different fin geometry were tested. The highest heat transfer coefficient was obtained with a tube which showed the highest performance for R123. However, the diference among the tubes was much smaller for the mixture than for R123. The heat transfer coefficient and the vapor-phase mass transfer coefficient decreased significantly with decreasing mass velocity. The mass transfer coefficient increased with condensation temperature difference, which was due to the effect of suction associated with condensation. On the basis of the analogy between heat and mass transfer, a dimensionless correlation of the mass transfer coefficient was developed for each tube.
机译：进行实验以获得在水平低翅片管交错排列的向下流动的共沸混合物R123 / R134a冷凝期间的逐行传热和传质数据。管束入口处的蒸汽温度和R134a的质量分数分别约为50℃和14％。制冷剂质量速度范围为9至34 kg m {sup}（-2）s {sup}（-1），冷凝温度差为1.9至12K。四种具有不同翅片几何形状的低翅片管经过测试。用显示R123最高性能的管获得最高的传热系数。但是，混合物中的管之间的差异比R123小得多。传热系数和汽相传质系数随着质量速度的降低而显着降低。传质系数随冷凝温度差而增加，这是由于与冷凝相关的吸力的影响。基于传热和传质之间的类比，为每个管子建立了传质系数的无量纲相关性。

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