Internal and external fin heat transfer enhancement technique for latent heat thermal energy storage in triplex tube heat exchangers

Al-Abidi, Abduljalil A.; Mat, Sohif; Sopian, Kamaruzzaman; Sulaiman, Muhammad Azwadi; Mohammad, Abdulrahman Th.

doi:10.1016/j.applthermaleng.2013.01.011

Cited by 436 publications

(107 citation statements)

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“…Various articles investigate the performance enhancement by fin shape and design variation. For instance, Al-Abidi et al [19] studied the design of shell-and-tube LTS using longitudinal fins. Furthermore, the influence of circular fin quantity and diameter have been examined by Erek et al [25] with evenly distributed fins, which is the most common way of fin placement.…”

Section: Introductionmentioning

confidence: 99%

“…In order to extend the range of application and to achieve better storage performances, research activities have been carried out to examine the heat transfer process [4,7,8]; storage types and configurations like a combination of different PCMs within one storage unit [9][10][11][12][13][14][15]; and the integration of highly heat conductive materials into the storage material, examples of which are copper, aluminum, stainless steel or carbon fiber [16][17][18][19][20][21][22]. These materials can be integrated in different forms, such as fins, honeycombs, wool or brush-form.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Shell-and-Tube Type Latent Thermal Energy Storage Performance with Different Arrangements of Circular Fins

2017

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Latent thermal energy storage (LTS) systems are versatile due to their high-energy storage density within a small temperature range. In shell-and-tube type storage systems fins can be used in order to achieve enhanced charging and discharging power. Typically, circular fins are evenly distributed over the length of the heat exchanger pipe. However, it is yet to be proven that this allocation is the most suitable for every kind of system and application. Consequently, within this paper, a simulation model was developed in order to examine the effect of different fin distributions on the performance of shell-and-tube type latent thermal storage units at discharge. The model was set up in MATLAB Simulink R2015b (The MathWorks, Inc., Natick, MA, USA) based on the enthalpy method and validated by a reference model designed in ANSYS Fluent 15.0 (ANSYS, Inc., Canonsburg, PA, USA). The fin density of the heat exchanger pipe was increased towards the pipe outlet. This concentration of fins was implemented linearly, exponentially or suddenly with the total number of fins remaining constant during the variation of fin allocations. Results show that there is an influence of fin allocation on storage performance. However, the average storage performance at total discharge only increased by three percent with the best allocation compared to an equidistant arrangement.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Shell-and-Tube Type Latent Thermal Energy Storage Performance with Different Arrangements of Circular Fins

2017

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“…Among the others, the use of PCMgraphite composites [3][4][5], encapsulation [6], and dispersion of nanoparticles [7][8][9]. However, most of the investigations concerns the use of extended surfaces (fins) to improve the performance of shell-and-tube LHTES units [10][11][12][13][14], since this configuration is closer to real PCM heat exchanger applications.…”

Section: Introductionmentioning

confidence: 99%

Second Law Optimization of a PCM Based Latent Heat Thermal Energy Storage System with Tree Shaped Fins

Sciacovelli¹,

Guelpa²,

Verda³

2014

Int. J. Thermo

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The aim of this paper is to perform a thermodynamic optimization of a Y shaped fin design used to improve thermal performance of a latent heat thermal energy storage (LHTES) unit. The investigation is performed through a CFD model that takes into account the thermal behavior of the system. Temperature and phase fields are obtained to characterize the heat transfer phenomenon and to compute the entropy generation rate within the system. Global entropy generation and energy flux are adopted as objective functions to perform a shape optimization of the Y shaped fins with angles and branches lengths that can vary freely. The optimization results indicate that a higher energy transfer is achieved by a fin configuration with long secondary branches with an orientation angle of 30°. This design allows one to increase PCM solidification rate of about 30%. Furthermore, Y-shaped fins allow to increase the exergy flux released by the PCM, thus Second-law efficiency is not affected although entropy generation increases. This work represents the first detailed thermodynamic optimization of a system involving an unsteady process. This aspect is particularly important since a clear tendency of many energy systems is toward transient operation, thus design optimization methods should evolve accordingly.

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“…On the other hand, techniques that require an external source of energy, as in improving the working the working fluids, using electrical fields, or mechanical mixing, are called ''active techniques'' [1]. Extensive research have been done in the field of improving heat transfer using the passive techniques, these improvements for a tubular heat exchangers mainly include the use of external modifications where the tube or tubes external surface is modified, as done by Abduljalil et al [2] in the use of external fins for the most inner tube in a triplex tubular heat exchanger with phase change material (PCM), they showed that increasing the number of fins results in a reduction in the time required to melt the (PCM) by 69.5% when compared with a slandered triplex exchanger, also the increase in fin length led to a reduction in melt time for the (PCM) as high as 73.9% in the case of 10mm fins compared to a standard triplex exchanger. Also Kumar et al [3] used different fin designs (triangular, rectangular, and parabola) that were added on external surface of the inner tube of a double pipe heat exchanger, their results showed that the use of fins increased the effectiveness of the heat exchanger by 21% for the rectangular fins, and pressure drop where the lowest in the case of parabolic fins.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Heat Transfer Enhancement in a Shell and Tube Heat Exchanger using Helical Coiled Wire Inserts

Weis

Abbas

Ridha

2018

Tikrit j. eng. sci.

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A B S T R A C TAn experimental work on heat transfer enhancement in a shell and tube heat exchanger by insertion of helical coiled wires into the tube bundle was conducted. Four different pitch sizes were used (4.8, 6.4, 8.0, 9.6) mm. The working fluid for both shell and tube sides of the exchanger was water. Flow arrangement used was parallel and laminar for both sides with a Reynolds number for the tube inside ranging (100-920). Variables were taken into account, including; convection heat transfer coefficient, number of heat transfer units, thermal effectiveness, and pressure drop. CFD analysis was done in order to validate the experimental results. The study results showed an increase in heat transfer coefficient on the tube side by 54% due to the use of 9.6 mm pitched inserts. Highest thermal effectiveness obtained was in the case of 9.6 mm pitch inserts. Pressure drop rose up to 260% due to inserts.

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Internal and external fin heat transfer enhancement technique for latent heat thermal energy storage in triplex tube heat exchangers

Cited by 436 publications

References 36 publications

Numerical Analysis of Shell-and-Tube Type Latent Thermal Energy Storage Performance with Different Arrangements of Circular Fins

Numerical Analysis of Shell-and-Tube Type Latent Thermal Energy Storage Performance with Different Arrangements of Circular Fins

Second Law Optimization of a PCM Based Latent Heat Thermal Energy Storage System with Tree Shaped Fins

Experimental and Numerical Study of Heat Transfer Enhancement in a Shell and Tube Heat Exchanger using Helical Coiled Wire Inserts

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