Air-side Heat Transfer and Pressure Drop Characteristics of Louver-finned Aluminum Heat Exchangers at Different Inclination Angles

Kim, Nae-Hyun; Kim, Doyoung; Choi, Yong-Min; Byun, Ho-Won

doi:10.1299/jtst.4.350

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Heat transfer coefficients in most cases are not significantly affected by inclination. For example, Kim et al [14] experimentally investigated inclining louvered fin heat exchangers in a duct. They investigated inclination angles up to 60° and found heat transfer coefficient did not decline significantly with inclination.…”

Section: Flow Ratementioning

confidence: 99%

Investigation of heat exchanger inclination in forced-draught air-cooled heat exchangers

Kennedy

Spence

Spratt

et al. 2013

Applied Thermal Engineering

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Highlights• Inclination only makes a small difference to thermal performance of ACHE• Increasing plenum depth only is slightly more effective -1% benefit over baseline• The flow tends to move to one side as the heat exchanger is inclined• This side is a good location for a performance limiting heat exchanger Investigation of heat exchanger inclination in forced-draught air-cooled heat exchangersIan J. Kennedy a * ikennedy03@qub.ac.uk +44 (0) 28 9097 AbstractThe purpose of this study is to determine the influence of inclining the heat exchanger relative to the fan in a forced draught air cooled heat exchanger. Since inclination increases plenum depth, the effect of inclination is also compared with increasing plenum depth without inclination. The experimental study shows that inclination improves thermal performance by only 0.5%, when compared with a baseline noninclined case with a shallow plenum. Similarly, increasing plenum depth without inclination has a thermal performance benefit of approximately 1%. The numerical study shows that, as the heat exchanger is inclined, the low velocity core at the centre of the heat exchanger moves to one side.

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Section: Flow Ratementioning

confidence: 99%

Investigation of heat exchanger inclination in forced-draught air-cooled heat exchangers

Kennedy

Spence

Spratt

et al. 2013

Applied Thermal Engineering

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“…Early investigations by Chilton and Genereaux, 1933 [2] examined existing data on pressure drops across tube banks and recalculated the data, proposing correlations for both staggered and inline tube bundles. A common approach to improve the heat transfer of a tube bundle is to increase the heat transfer area by introducing various types of fins, such as plain fins [3], wavy fins [4], louvred fins [5][6][7], and offset fins [8], in addition to the tube bundle. The addition of fins serves to increase the surface area available for heat transfer to enhance overall heat transfer.…”

Section: Introductionmentioning

confidence: 99%

CFD-Based Approach to Propose a Zigzag-Shaped Tube Heat Exchanger without Fins

Rayhan,

Kariya,

Miyara

2023

Thermo

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This study explores the application of zigzag-shaped, finless tubes in enhancing heat transfer performance within heat exchangers. Using three-dimensional numerical simulations, we examined the heat transfer per unit area and the volume of the pressure drop, comparing these findings with a traditional parallel tube heat exchanger. This innovative design strategy involved arranging zigzag-shaped tubes at varying distances, and the thermal transfer and frictional characteristics were tested at different air speeds. This research suggests that the introduction of zigzag heat exchangers, as opposed to traditional fin-and-tube designs, led to a significant improvement in heat transfer. This enhancement is attributed to the swirling flow created around the zigzag tubes, which increased the total heat transfer area. Furthermore, we found that the heat transfer area increased by 14.2%, 32.1%, and 63.9% for tube zigzag angles of 30°, 45°, and 60°, respectively, when compared to a parallel tube heat exchanger. Consequently, the zigzag-shaped tube heat exchanger demonstrated not only superior heat transfer, but also a reduction in frictional pressure loss.

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“…The creation of swirling flow to disturb a boundary layer is one of the techniques for improving heat transfer in tube heat exchangers. Swirling and vortexing flows can be induced by using tube inserts such as; twisted tape (Song et al, 2008;Kim et al, 2009;Thianpong et al, 2012;Nanan and Eiamsa-ard, 2014;Changcharoen et al, 2015;Eiamsa-ard et al, 2013;Eiamsa-ard et al, 2009), woven wire screen matrix (Zhao et al, 2011), helical screw tape (Guo et al, 2010;Sivashanmugam and Suresh, 2007) and conical spring (Karakaya and Durmuş, 2013) and modified tubes including corrugated/twisted tube and helical oval tube (Li et al, 2011, Rainieri andPagliarini, 2002 ;Akhavan-Behabad and Esmailpour, 2014), etc. In general, modified tubes offer lower heat transfer than tube inserts.…”

Section: Introductionmentioning

confidence: 99%

Effect of geometrical parameters on turbulent flow and heat transfer behaviors in triple-start corrugated tubes

Promthaisong

Jedsadaratanachai

Eiamsa-ard

2018

JTST

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Computational results of flow structure, pressure loss and heat transfer characteristics in triple-start corrugated tubes are reported. The influences of the depth ratio (DR = 0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.14 and 0.16) and pitch ratio (PR = 0.5, 0.65, 0.75, 1.0, 1.5 and 2.0) were investigated in turbulent flow regime, Re = 5000 to 20,000. The computational results indicated that the triple-start corrugated tubes generate main swirl flow and helical swirl flow which helps to reduce the thermal boundary layer thickness and enhance the heat transfer rate. The flow and heat transfer become under fully developed periodic condition around x/D = 6.0. The friction factor monotonically increases with the rise of DR values and decrease PR values while maximum heat transfer rate is found at DR = 0.08 and PR = 0.75. Nusselt numbers and friction factors of triple-start corrugated tubes in the investigated range are found to be 0.8 to 2.31 and 1.0 to 17.14 times over those of the straight circular smooth tube, respectively. For the range studied, the triple-start corrugated tube with DR = 0.06 and PR = 0.75 offers the maximum thermal enhancement factor of 1.21 at Re = 5000.

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Air-side Heat Transfer and Pressure Drop Characteristics of Louver-finned Aluminum Heat Exchangers at Different Inclination Angles

Cited by 5 publications

References 13 publications

Investigation of heat exchanger inclination in forced-draught air-cooled heat exchangers

Investigation of heat exchanger inclination in forced-draught air-cooled heat exchangers

CFD-Based Approach to Propose a Zigzag-Shaped Tube Heat Exchanger without Fins

Effect of geometrical parameters on turbulent flow and heat transfer behaviors in triple-start corrugated tubes

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