Dry and wet air-side performance of a louver-finned heat exchanger having flat tubes

Kim, Nae Hyun; Kim, Soo Hwan

doi:10.1007/s12206-010-0409-1

Cited by 22 publications

(3 citation statements)

References 13 publications

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“…These drawbacks can be overcome by using either oval or flat tube. Compared to round tube HE, flat tube HE has better air-side heat transfer coefficient and lower pressure drop due to small wake area behind the tubes [15]. Moreover, noise and vibration levels in flat tubes are expected to be lower than that of circular tubes [16,17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Adam¹,

Oumer²,

Alias³

et al. 2022

Int. J. Automot. Mech. Eng.

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The performance of compact fin-and-flat tube heat exchangers (HE) can be affected by many geometrical and processing factors and one of them is tube inclination angle. However, the effect of flat tube inclination angle on the thermal-hydraulic performance of the HE is not fully examined. This paper investigates the effects of flat tube inclination angles on heat transfer and pressure drop characteristics of fined flat tube HE when the tubes are deployed in in-line and staggered arrangements. A symmetric numerical method based on FLUENT software was carried out with six different tube inclination angles (0°, 30°, 60°, 90°, 120°, and 150°) in moderately high Reynolds number. From the results, it was observed that heat transfer coefficient increased with the augmentation of the tube inclination angle from 0 o to 90 o and decreased for 120 o and 150 o . With the increase of tube inclination angle, the average Nusselt number rose by 36.3%. This might be due to the reason that the tube surface area increases with the inclination angle, which also results in the largest increment of the pressure drop by 42.0%. Overall, the 90 o tube inclination angle showed the highest enhancement in heat transfer for both inline and staggered configurations with a maximum enhancement of 41.2% for in-line and 32.2% for staggered arrangements. However, the heat transfer enhancements were accompanied by high-pressure drop penalties of up to 44.2% and 42.6% for in-line and staggered arrangements, respectively. Therefore, inclining the tubes at 90 o is recommended where high heat transfer is required. On the other hand, 0 o tube inclination angle is recommended where pumping power is a crucial issue.

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Section: Introductionmentioning

confidence: 99%

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Adam¹,

Oumer²,

Alias³

et al. 2022

Int. J. Automot. Mech. Eng.

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“…Other experimental investigations (Kim et al, 2001;Zhang et al, 2001;Diani et al, 2016) generally confirmed the findings by Webb (2000a, 2000b). For a louver-finned heat exchanger having flattened round tubes, Kim and Kim (2010) showed that the pressure drop under wet condition was larger than that under dry condition, whereas the heat transfer coefficients were approximately equal. Generally, the condensate drainage in a parallel flow heat exchanger is poor because horizontal flat tubes block the gravitational condensate flow.…”

Section: Introductionmentioning

confidence: 99%

Airside heat transfer and pressure drop of louver-finned parallel flow heat exchanger having a drainage channel

Kim

Cho

2018

JTST

Self Cite

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Conventional louver fins have an inherent problem of condensate drainage. In this study, a newly developed louver fin is introduced. The louver fin has downstream a drainage channel. The dry and the wet surface heat transfer and pressure drop characteristics of the new sample were investigated, and the results were compared with those of the conventional sample. Compared to the conventional sample, superior wet surface heat transfer and pressure drop characteristics were obtained. The j factors of the new sample were 40% larger, and the f factors were 9% smaller. In addition, the wet j and f factors were not much different from the dry ones, which imply that excellent condensate drainage is possible for the new fin. Under dry condition, however, poor heat transfer and pressure drop characteristics were obtained. The j factors of the conventional sample were 81% larger, and the f factors were 14% smaller. Allocation of the fin surface to flat (not enhanced) drainage channel for the new fin may be responsible. Under wet condition, j/f 1/3 of the new sample was 45% larger than that of the conventional sample. Under dry condition, however, j/f 1/3 of the conventional sample was 91% larger.

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“…These disadvantages can be solved by using oval or flat tubes in HE. Apart from that, it is proven that flat-tube HE gives a higher air-side heat transfer coefficient with a low-pressure drop [9]. The shape of the tube and fin, fin pitch, tube pitch, tube arrangement and tube angle are all geometric parameters whereas air velocity and temperature of the tube are the process parameters that influence the heat transfer performance on CHE.…”

Section: Introductionmentioning

confidence: 99%

Flow and Heat Transfer Simulation Analysis of 3D Compact Heat Exchanger

Nair

Oumer

Aziz

et al. 2021

ARFMTS

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Compact heat exchangers (CHEs) are one of the most commonly used heat exchangers in the industry due to their superior advantages over other types of heat exchangers. Various geometric (fin spacing, tube inclination angle, etc) and process (such as flow velocity, temperature, etc) parameters affect the performance of such compact HEs. This research aims to examine the effects of fin spacing, tube inclination angle, and airflow velocity on heat transfer and pressure drop performance of CHE in both inline and staggered configurations. A three-dimensional (3D) numerical method with the aid of Ansys FLUENT software was carried out for the laminar flow condition. Based on the obtained results, the highest average heat transfer coefficient was observed at 120° for both tube arrangements while the lowest average pressure drop penalty is at 30°. Therefore, the recommended inclination angle when high heat transfer is needed is at 120° while if the pumping power is the major problem, 30 °or 150° is recommended. based on the London area goodness factor (j/f), 30° and 150° show the highest value for both configurations. The j/f factor decreases with the increase of Reynolds number for both configurations. In addition, 120° shows the lowest j/f which can be due to the high pressure drop.

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Dry and wet air-side performance of a louver-finned heat exchanger having flat tubes

Cited by 22 publications

References 13 publications

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Investigation of thermal-hydraulic performance in flat tube heat exchangers at various tube inclination angles

Airside heat transfer and pressure drop of louver-finned parallel flow heat exchanger having a drainage channel

Flow and Heat Transfer Simulation Analysis of 3D Compact Heat Exchanger

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