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Heat Transfer in the Evaporators of a Double-Evaporator Refrigerating System

机译：双蒸发器制冷系统蒸发器中的热传递

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摘要

This paper presents the heat transfer characteristics of the evaporators in a double-evaporator refrigerating system with an environment-friendly refrigerant, propane (R-290). Based on the Buckingham Pi theorem, dimensionless correlations are developed to predict the heat transfer coefficients of the refrigerant in high- and low-temperature evaporators (h{sub}H and h{sub}L) and the ratio of the cooling capacity of the high-temperature evaporator to the total capacity (α) in the system. The results show that h{sub}H is affected mainly by the condensing pressure, the length of the low-temperature capillary tube, and the logarithmic-mean temperature difference of the high-temperature evaporator, while h{sub}H is affected mainly by the length of the high-temperature capillary tube and the logarithmic-mean temperature difference of the low-temperature evaporator. Note, though, that the condensing pressure and the logarithmic-mean temperature difference of the high-temperature evaporator are the main factors affecting α. Some of the correlations result in good predictions, though the required numbers of variables of these correlations are much more than those presented in this work. A comparison of the experimental measurements of h{sub}H and h{sub}H to the values calculated by the correlations from the literature is made. Some of the correlations result in good predictions, though the required variables of these correlations are much more than those presented in this work.
机译：本文介绍了采用环保制冷剂丙烷（R-290）的双蒸发器制冷系统中蒸发器的传热特性。基于白金汉Pi定理，发展了无量纲相关性，以预测高温和低温蒸发器中制冷剂的传热系数（h {sub} H和h {sub} L）以及制冷剂的冷却能力比。高温蒸发器达到系统中的总容量（α）。结果表明，h {sub} H主要受冷凝压力，低温毛细管的长度和高温蒸发器的对数平均温差的影响，而h {sub} H主要受h {sub} H的影响。由高温毛细管的长度和低温蒸发器的对数平均温差决定。但是请注意，高温蒸发器的冷凝压力和对数平均温差是影响α的主要因素。一些相关性可以带来良好的预测，尽管这些相关性所需的变量数量比本工作中提出的要多得多。将h {sub} H和h {sub} H的实验测量值与通过文献中的相关性计算出的值进行了比较。一些相关性可以带来良好的预测，尽管这些相关性所需的变量比本工作中介绍的要多得多。

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