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Condensation in Horizontal Smooth Tubes: A New Heat Transfer Model for Heat Exchanger Design

机译：水平光滑管中的冷凝：换热器设计的新传热模型

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摘要

This paper proposes a new method to determine the condensation heat transfer coefficient of fluids flowing into horizontal smooth tubes with internal diameters D > 3 mm. The method has been drawn up as simply as possible and is ready to use in heat exchanger modeling and design applications. It is also suitable to work very well with old and new fluids used in the refrigeration, air conditioning, and heat pump industries. Particular attention is given to accuracy: it has been tested over a wide updated experimental database and comes from many different independent researchers with reduced experimental uncertainties. In order to obtain an easy structure, only two equations are employed, related respectively to ΔT-independent and to ΔT-dependent fluid flows. All the parameters that influence the condensation heat transfer have been included. A comparison has been conducted against HCFCs, HFCs, HCs, carbon dioxide, ammonia, and water data. Zeotropic mixtures with two and three components are also considered in the comparison by applying the Bell and Ghaly [1] correction to calculate the relative heat transfer penalization. A model has been developed with the idea of getting high accuracy through an easy structure, and the results show a very satisfactory agreement with experimental data: average deviation e{sub}R = +2%, absolute mean deviation e{sub}(AB) = 14%, and standard deviation σ{sub}N = 19% for the total number of 5478 data points.
机译：本文提出了一种新的方法来确定流入内径D> 3 mm的水平光滑管中的流体的冷凝传热系数。该方法已尽可能简单地拟定，可以在热交换器建模和设计应用中使用。它也适合与制冷，空调和热泵行业中使用的新旧流体很好地配合使用。尤其要注意准确性：它已经在广泛更新的实验数据库中进行了测试，并且来自许多不同的独立研究人员，它们减少了实验不确定性。为了获得简单的结构，仅采用两个方程，分别与独立于ΔT和依赖于ΔT的流体流有关。影响凝结传热的所有参数都已包括在内。已与HCFC，HFC，HC，二氧化碳，氨和水的数据进行了比较。通过应用Bell和Ghaly [1]校正来计算相对传热损失，在比较中还考虑了具有两种和三种成分的共沸混合物。已经开发出一种模型，其想法是通过简单的结构获得高精度，结果表明与实验数据非常令人满意：平均偏差e {sub} R = + 2％，绝对平均偏差e {sub}（AB ）= 14％，而对于5478个数据点的总数，标准差σ{sub} N = 19％。

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