The effects of frost thickness on the heat transfer of finned tube heat exchanger subject to the combined influence of fan types

Huang, Jeng Min; Hsieh, Wen Chien; Ke, Xin Ji; Wang, Chi-Chuan

doi:10.1016/j.applthermaleng.2007.06.020

Cited by 36 publications

(8 citation statements)

References 21 publications

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“…7 with uncertainty values and this result is consistent with the study performed by Huang [5]. The author has also stated that the defrost period should start when half of the flow area is blocked by frost.…”

supporting

confidence: 80%

“…Author such as Chen et al [1], Aljuwayhel et al [2], Schmidt and Kristensen [3], Da Silva [4], Huang et al [5] and Groll et al [6] investigated frost growth on tube-finned evaporators under variable air flow conditions. While these studies have highlighted the change of heat transfer rate and pressure drop depending on frost formation, some of them have examined the effects of fan types on frost growth.…”

mentioning

confidence: 99%

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Experimental investigation of the effect of air velocity on a unit cooler under frosting condition: a case study

Bayrak

Çağlayan²,

Konukman

2017

Heat Mass Transfer

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supporting

confidence: 80%

mentioning

confidence: 99%

Experimental investigation of the effect of air velocity on a unit cooler under frosting condition: a case study

Bayrak

Çağlayan²,

Konukman

2017

Heat Mass Transfer

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“…The performance of a HE affects the effectiveness of the heat exchange and this makes HE an important issue in studies of energy saving [1]. Since global energy consumption is negatively affecting the environment and causing ozone depletion, an increasingly more intelligent use of the available energy is required.…”

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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“…When on the surface, frost layers increases thermal resistance and air pressure drops across the heat exchanger, thus weakening overall performance [1]. Therefore, studying the effect of the frost layer on heat exchanger performance is important in the design of efficient heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and pressure drop amidst frost layer presence for the full geometry of fin-tube heat exchanger

Kim

Choi

et al. 2010

J Mech Sci Technol

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The present study numerically solves the flow and thermal fields in the full geometry of heat exchanger modeling with frost layer presence on the heat exchanger surface. The effects of air inlet velocity, air inlet temperature, frost layer thickness, fin pitch, fin thickness, and heat exchanger shape on the thermo-hydraulic performance of a fin-tube heat exchanger are investigated. Heat transfer rate rises with increasing air inlet velocity and temperature, and decreasing frost layer thickness and fin pitch. Pressure drop rises with increasing air inlet velocity and frost layer thickness, and decreasing fin pitch. The effect of fin thickness on heat transfer and pressure drop is negligible. Based on the present results, we derived the correlations, which express pressure drop and temperature difference between air inlet and outlet as a function of air inlet velocity and temperature, as well as frost layer thickness.

show abstract

The effects of frost thickness on the heat transfer of finned tube heat exchanger subject to the combined influence of fan types

Cited by 36 publications

References 21 publications

Experimental investigation of the effect of air velocity on a unit cooler under frosting condition: a case study

Experimental investigation of the effect of air velocity on a unit cooler under frosting condition: a case study

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

Heat transfer and pressure drop amidst frost layer presence for the full geometry of fin-tube heat exchanger

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