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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Effect of sensible heat, condensation in superheated and subcooled region incorporated in unified model for heat rejection in condensers in horizontal round smooth tubes
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Effect of sensible heat, condensation in superheated and subcooled region incorporated in unified model for heat rejection in condensers in horizontal round smooth tubes

机译：统一模型中的显热，过热和过冷区域中的冷凝的影响，用于水平圆形光滑管冷凝器的散热

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摘要

Heat transfer in condensers is typically divided into 3 zones: superheated, two-phase and subcooled. The heat transfer coefficients (HTC) for these zones show discontinuity at qualities of 0 and 1, where two-phase correlations meet single phase flow correlations. The paper presents a model that bridges that discontinuity. It takes into account the condensation in de-superheating zone and subcooled liquid in two-phase zone which results in condensation in subcooled region. Cavallini et al. (2006) and Gnielinski correlations have been used as a baseline correlations in the model to calculate HTC in two-phase and single phase zone respectively. The model has been compared to experimental data in condensation for R1234ze(E), R134a and R32 conducted from superheated to subcooled region and predicts the HTC satisfactorily within an accuracy of 16% for these fluids.
机译：冷凝器中的传热通常分为3个区域：过热，两相和过冷。这些区域的传热系数（HTC）在质量为0和1时显示不连续，其中两相相关满足单相流动相关。本文提出了一种弥合这种不连续性的模型。它考虑了过热区的冷凝和两相区的过冷液体，这导致过冷区的冷凝。 Cavallini等。 （2006年）和Gnielinski相关已被用作模型中的基线相关，分别计算了两相和单相区域的HTC。该模型已与R1234ze（E），R134a和R32在过热至过冷区域的冷凝实验数据进行了比较，并预测HTC在这些流体中的准确度在16％以内。

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