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Effect of Fin Type on Performance of Compact Heat Exchangers with Mini-channel
Heat Transfer Engineering ( IF 2.3 ) Pub Date : 2020-12-11
Mehmet Mete Ozturk

Abstract

A comparative investigation is carried out to reveal the effect of plate-fin type variation on the performance of compact heat exchangers (CHX) with a mini-channel flat tube. The compact heat exchanger prototypes with plain, louver and offset strip fins with the same frontal area are tested in the same air tunnel under the same experimental conditions to provide a better comparison. Besides the typical performance measures namely Colburn j-factor, friction, and volume goodness factors, some rarely chosen measures are considered as well, such as the core volume goodness factor to evaluate the performance of the prototypes from all aspects. Due to the nature of the mini channel flat tubes, the flow depth is very narrow and one of the targets is to understand the importance of the fin-type on the performance in such a short flow depth. As regards to the outcomes, the CHX with plain fin shows better performance when it is evaluated by the typical approaches which is presented with respect to Reynolds number but when the compactness is considered in performance evaluation, CHX with louver fins achieves higher heat transfer indexes than other fin geometries.



中文翻译:

翅片类型对紧凑型微通道换热器性能的影响

摘要

进行了一项比较研究,以揭示板翅式类型变化对带有微型通道扁平管的紧凑型热交换器(CHX)的性能的影响。在相同的实验条件下,在相同的空气通道中对具有相同前部面积的带有平片,百叶窗片和偏置带状翅片的紧凑型热交换器原型进行了测试,以提供更好的比较。除了典型的绩效指标,即Colburn j-系数,摩擦力和体积良性系数,还考虑了一些很少选择的措施,例如从各个方面评估原型性能的核心体积良性系数。由于微型通道扁平管的特性,流动深度非常狭窄,目标之一就是要了解翅片式在如此短的流动深度下对性能的重要性。关于结果,用普通翅片的CHX通过雷诺数方面的典型方法进行评估时表现出更好的性能,但是当在性能评估中考虑紧凑性时,带有百叶板式翅片的CHX的传热指数高于其他鳍形。

更新日期:2020-12-11
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