Heat transfer analysis of fin-and-tube heat exchangers with flat and louvered fin geometries

Čarija, Zoran; Franković, Bernard; Perčić, Marko; Čavrak, Marko

doi:10.1016/j.ijrefrig.2014.05.026

Cited by 54 publications

(16 citation statements)

References 18 publications

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“…Some researchers have studied the effects of some of the aforementioned parameters on the thermal-hydraulic performance of flat tube HE. Numerous numerical and experimental studies have been done to determine the air-side thermal and flow performances using different types of tubes and fins [10,[18][19][20][21][22]. Nascimento and Garcia [23] reported that flat tube with a shallow square dimple enhanced the heat transfer considerably.…”

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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“…They numerically investigated the effects of friction factor f and Colburn factor j associated with corrugated louvered fins. The air-side fluid flow and heat transfer characteristics of a multi-row fin-and-tube heat exchanger with flat and louvered fins were analyzed by Carija et al for a wide range of operating conditions [19]. They found out that louver length has the greatest influence on heat transfer capacity.…”

Section: Introductionmentioning

confidence: 99%

The effects of fin height, fin-tube contact thickness and louver length on the performance of a compact fin-and-tube heat exchanger

Javaherdeh¹,

Vaisi²,

Moosavi³

2018

IJHT

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In this paper, the effects of fin height, louver length and fin-tube contact thickness on the amount of heat transfer and pressure drop in a compact louvered fin-and-tube heat exchanger were studied experimentally and numerically using the − method. The effects of fintube contact thickness (with the variations of this thickness being more than or less than fin thickness variation) and fin height and also the relationship between Louvre length and fin height were examined. To validate the modeling, first, the numerical model was compared with an experimental prototype, and a good agreement was observed between the experimental and numerical results. The modeling results indicate that the increase in the fin-tube contact thickness, until the contact thickness becomes equal to fin thickness, leads to the improvement of heat exchanger performance; but beyond that, it is ineffective. Also, heat exchanger performance improves with the increase of louver length at a fixed fin height. According to the results, the minimum Louvre length should be 1.0 mm less than the fin height. An analytical equation relating Louvre length to fin height has been obtained, which agrees with model results by up to 98%.

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“…Computational fluid dynamics was validated through comparing the results of numerical simulation and the experimental results. The output of the research reflected minimum average of Nusselt number deviation, and almost complete corresponding pressure drop [21].…”

Section: Introductionmentioning

confidence: 94%

Numerical analysis of the surface and geometry of plate fin heat exchangers for increasing heat transfer rate

Shahdad

Fazelpour

2018

Int J Energy Environ Eng

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This paper investigates the flow field and turbulent flow heat transfer around an array of plain and perforated fin using Fluent software within the range of 20,000-50,000 Reynolds. Regarding the turbulent flow, the k-ε RNG turbulence model was implemented, and SIMPLE algorithm was used for solving the equations of three-dimensional, steady, and incompressible flow. In the simulation process, air was considered as the working fluid with consistent physical properties. The results revealed that perforated fins increase the heat transfer coefficient as well as Nusselt number. The highest heat transfer coefficient and Nusselt number was achieved for perforated fins with two square holes. Moreover, it was concluded that increase of Reynolds number notably increases the heat transfer coefficient and Nusselt number. The total drag force imposed to plain fins was higher than the force imposed to perforated fins. As a result, by changing plain fins into perforated fins, the pressure decreases due to passage of the flow through the pins, and accordingly, the total drag force imposed to the fins decreases. Finally, it was revealed that attaching some pins on the plain fins along the passing flow will decrease the pressure, while notably increase the heat transfer. Furthermore, it can reduce the fins' weight and price.

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Heat transfer analysis of fin-and-tube heat exchangers with flat and louvered fin geometries

Cited by 54 publications

References 18 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

The effects of fin height, fin-tube contact thickness and louver length on the performance of a compact fin-and-tube heat exchanger

Numerical analysis of the surface and geometry of plate fin heat exchangers for increasing heat transfer rate

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