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首页> 外文期刊>International Journal of Heat and Mass Transfer >Condensation of vapor in the presence of non-condensable gas in condensers
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Condensation of vapor in the presence of non-condensable gas in condensers

机译：在冷凝器中存在不可冷凝气体的情况下冷凝蒸汽

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This paper presents a set of differential and algebraic equations that model heat and mass transfer in condensers in which a mixture of water vapor and non-condensable gas is cooled. The model has been used to predict the condensation rate, the bulk temperatures of the coolant and the gas-vapor mixture, and the surface temperatures of the condenser wall. The predicted results for counter flow tube condensers are compared with three sets of published experimental data for system in which air is the non-condensable gas. It is found that the predicted condensation rates and coolant bulk temperatures agree very well with all the three sets of experimental data, the predicted wall temperatures agree reasonably well with the experimental results, and the agreement between the predictions and the experimental results on the bulk temperature of the air-vapor mixture is excellent for one set of the experimental data, reasonable for the second set of experimental data, but poor for the third set of experimental data. It is suggested that the poor agreement between the predicted and measured bulk temperatures of the mixture for the third set of experimental data arises from the experimental errors. The results from this study show that when modeling vapor condensation in the presence of a non-condensable gas, a simple model for the mixture channel alone may not be sufficient since neither the temperature nor the heat flux at the wall can be assumed to be constant. The results also show that the wall temperature in the coolant channel can be quite high, and careful modeling of the heat transfer in the coolant channel is needed in order to achieve good agreement between the model predictions and the experimental results.
机译：本文介绍了一组微分方程和代数方程，它们对冷凝器中的热和质量传递进行建模，在冷凝器中，水蒸气和不可冷凝气体的混合物被冷却。该模型已用于预测冷凝率，冷却剂和气体-蒸汽混合物的总体温度以及冷凝器壁的表面温度。将逆流管式冷凝器的预测结果与三组已发布的针对空气为不可冷凝气体的系统的实验数据进行了比较。发现预测的冷凝率和冷却剂总温度与所有三组实验数据都非常吻合，预测的壁温与实验结果基本吻合，并且预测与实验结果在总温度上具有一致性。空气-蒸汽混合物的混合气对于一组实验数据是优异的，对于第二组实验数据是合理的，但是对于第三组实验数据是差的。建议第三组实验数据的混合物预测和实测体温之间的一致性差是由于实验误差引起的。这项研究的结果表明，当在不凝性气体存在下对蒸汽凝结进行建模时，仅凭混合物通道的简单模型可能不够，因为不能假定壁上的温度或热通量都恒定。结果还表明，冷却剂通道中的壁温可能很高，因此需要仔细建模冷却剂通道中的热传递，以使模型预测与实验结果之间达到良好的一致性。

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