Air side performance characterization of wavy Fin-and-tube heat exchangers having elliptic tubes with large waffle heights

Lee, Yee-Ting; Chien, Liang-Han; He, Jiacheng; Wen, Chih-Yung; Yang, An-Shik

doi:10.1016/j.applthermaleng.2022.119220

Cited by 18 publications

(1 citation statement)

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“…The literature [12][13][14][15][16] reveals that the thermal performance of fin-and-tube type HXs relies on geometrical parameters such as tube pitch spacing in addition to operational parameters including fluid properties, e.g., temperatures at the inlet and outlet of the fluid streams, their flowrates, and the overall coefficient of heat transfer. Moreover, previous studies show that for a given fin-and-tube HX, the thermal performance is influenced by the topologies of the two fluid streams.…”

Section: Introductionmentioning

confidence: 99%

Effect of Airflow Non-Uniformities on the Thermal Performance of Water–Air Heat Exchangers—Experimental Study and Analysis

et al. 2022

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The thermal performance of fin-and-tube heat exchangers (HX) is a crucial aspect in a multitude of applications and fields; several design and operational parameters influence this performance. This study focuses on the issue of flow maldistribution and its effect on the HX thermal performance. For this purpose, an experimental setup is designed and implemented to emulate the conditions under which an automotive heat exchanger operates in regard to the non-uniform upstream airflow velocity distribution over the HX surface. The setup allows obtaining various configurations of airflow velocity non-uniformity of some desired mean velocity and standard deviation. The experimental results reveal that a higher degree of non-uniformity (higher standard deviation of the velocity distribution) causes an increased deterioration of the HX thermal performance. For example, at a water flowrate of 200 L/hr and a mean airflow velocity of 2 m/s, increasing the standard deviation from 0 to 2 m/s (i.e., moving from the lowest to highest degrees of non-uniformity) causes a total deterioration of 27% in the performance (3.78 to 2.75 kW, respectively), which can also be observed in the increased level of outlet water temperature (53.8 to 58.2 °C, respectively). The obtained results confirm the numerical results reported in the literature.

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