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Thermohydraulic and condensing phase-change analysis within the indoor unit of a split-type air-conditioner
Case Studies in Thermal Engineering ( IF 6.8 ) Pub Date : 2020-07-08 , DOI: 10.1016/j.csite.2020.100714
Chung-Chun Tsao , Yang-Cheng Shih , Chun-Hsiung Lin , Ling-Yu Chao , Shih-Cheng Hu

Split-type air conditioners (SACs) are widely used in households and offices. To aid the design of a SAC, this study develops a theoretical thermohydraulic and condensing phase-change model for the two-dimensional indoor unit of a small-sized SAC. It also adopts the Computational Fluid Dynamics (CFD) software-ANSYS FLUENT V19.1 to analyze its internal flow field and heat and mass transfer performance. To simulate the thermal performance of the evaporators, we employed the non-equilibrium thermal model to predict the temperature distribution of the aluminum fins and wet air. The two-phase mixture model was used to simulate the transport phenomena of wet air and liquid water within the SAC. We used Fick’s law and Chilton-Colburn analogy to predict the condensation rate on the surfaces of the round tubes and the compact fins of the evaporators, respectively. We also compared the results of the volume flow rate and the sensible and latent heat capacities of the indoor unit predicted by the CFD method with those measured by the experiments, revealing that both results were in close agreement and that the model developed in this study was accurate.



中文翻译:

分体式空调室内机内的热工和冷凝相变分析

分体式空调(SAC)广泛用于家庭和办公室。为帮助SAC的设计,本研究为小型SAC的二维室内单元开发了理论上的热工和冷凝相变模型。它还采用计算流体动力学(CFD)软件-ANSYS FLUENT V19.1来分析其内部流场以及传热和传质性能。为了模拟蒸发器的热性能,我们采用非平衡热模型来预测铝翅片和湿空气的温度分布。两相混合模型用于模拟SAC中湿空气和液态水的传输现象。我们使用菲克定律和Chilton-Colburn类比法来预测圆管表面和蒸发器紧凑翅片上的冷凝率,分别。我们还将CFD方法预测的室内机的体积流量以及显热和潜热的结果与实验测量的结果进行了比较,发现这两个结果非常吻合,并且本研究开发的模型是准确。

更新日期:2020-07-08
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