Numerical study of enhancing vehicle radiator performance using different porous fin configurations and materials

Baou, M.; Afsharpanah, Farhad; Delavar, Mojtaba Aghajani

doi:10.1002/htj.21624

Cited by 13 publications

(9 citation statements)

References 25 publications

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“…Aside from the numerous advantages of ice storage systems, the low charging and discharging speeds act as impediments to the generalization of these systems. Some of the techniques that are probably effective to solve these problems are the conventional heat transfer augmentation methods such as twisted tape insertion on the HTF side, using nano additives, metal foams [ 2 ], special HTF tube types, and fins.…”

Section: Introductionmentioning

confidence: 99%

Compound Heat Transfer Augmentation of a Shell-and-Coil Ice Storage Unit with Metal-Oxide Nano Additives and Connecting Plates

et al. 2022

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Due to the high enthalpy of fusion in water, ice storage systems are known as one of the best cold thermal energy storage systems. The phase change material used in these systems is water, thus it is inexpensive, accessible, and completely eco-friendly. However, despite the numerous advantages of these systems, the phase change process in them is time-consuming and this leads to difficulties in their practical application. To solve this problem, the addition of nanomaterials can be helpful. This study aims to investigate the compound heat transfer enhancement of a cylindrical-shaped unit equipped with double helically coiled coolant tubes using connecting plates and nano additives as heat transfer augmentation methods. Complex three-dimensional numerical simulations are carried out here to assess the best heat exchanger material as well as the impact of various nanoparticle types, including alumina, copper oxide, and titania, and their concentrations in the PCM side of the ice storage unit. The influence of these parameters is discussed on the charging rate and the temperature evolution factor in these systems. The results suggest that using nano additives, as well as the connecting plates, together is a promising way to enhance the solidification rate by up to 29.9%.

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Section: Introductionmentioning

confidence: 99%

Compound Heat Transfer Augmentation of a Shell-and-Coil Ice Storage Unit with Metal-Oxide Nano Additives and Connecting Plates

et al. 2022

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“…13 These devices have various applications in air conditioning systems, power plants, and industries. 14 Shell and coil (SHAC) HXs are one of the HXs that can be used for various applications. 15 The usage of coiled tubes instead of straight tubes leads to the formation of centrifugal force and vortexes within the flow, which can considerably enhance the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

“…HXs are devices that can be utilized to exchange heat from one medium to another one 13 . These devices have various applications in air conditioning systems, power plants, and industries 14 . Shell and coil (SHAC) HXs are one of the HXs that can be used for various applications 15 .…”

Section: Introductionmentioning

confidence: 99%

Accelerating the charging process in a shell and dual coil ice storage unit equipped with connecting plates

Afsharpanah

Pakzad

Ajarostaghi

et al. 2022

Intl J of Energy Research

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Summary Frequent power outage in developing countries has created many problems for the people living in these regions, one of the most important of which is food spoilage due to the rise of refrigerator temperature. Ice storage systems are one of the promising techniques for handling this difficulty. Computational simulations are done here to influence the effects of dimensionless parameters on the charging rate of a shell and dual coil ice storage unit equipped with connecting plates as heat transfer enhancers. The ice storage unit is intended to be used as a backup cooling source for refrigerators in these regions. The studied parameters include the helical pitch length/storage height ratio (α1), the helical coil distance/storage diameter ratio (α2), the helical coil diameter/storage diameter ratio (α3), the connecting plate length/storage height ratio (α4), the connecting plate thickness/tube diameter ratio (α5), the modified Stefan number of the refrigerant flow (Ste*), and refrigerant flow Reynolds number (Re). The results suggest that the geometrical optimization of the proposed ice storage with α1, α2, and α3 parameters can improve the charging process up to 16.69%, 7.25%, and 18.84%, respectively. Also, the presence of full‐length connecting plates can enhance the charging rate by up to 12%. While the influence of the Ste* on the charging rate is considerably high (25.56%), the Re does not exhibit a noticeable effect (0.95%). Moreover, the influence of natural convection on the process was considered, however, it was found that it does not have a considerable effect on the ice formation.

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“…Passive methods are cheaper and simpler to use, that's why using these techniques are more common. Extended surfaces [23][24][25], porous mediums [26][27][28][29], fluid additives [30][31][32][33][34] and swirl flow devices [35][36][37] can be placed in this category.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Non-Uniform Heat Transfer Enhancement in Parabolic Trough Solar Collectors Using Dual Modified Twisted-Tape Inserts

Afsharpanah¹,

Sheshpoli²,

Pakzad³

et al. 2020

Journal of Thermal Engineering

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In this paper, a numerical investigation is presented on heat transfer augmenting by using various kinds of modified multiple twisted tape inserted in solar parabolic trough collectors. The pressurized water is considered as working fluid and Reynolds number varying from 10000 to 20000. The received heat flux on the solar absorber was assumed non-uniform due to hemispheric insolation of sun. The obtained numerical results for the Nusselt number, friction factor and thermal performance are presented for each cases. Various types of twisted tape including single twisted tape, normal, perforated, center-cleared, square, and V-cut dual twisted tape are considered and analyzed. The numerical simulations are performed by a commercial CFD code, ANSYS FLUENT 18.2. The obtained results revealed that at Re=10000 and 20000, the average Nusselt numbers of case with dual v-cut twisted tapes are more than plaine tube by 19.58 and 17.44%, respectively. Moreover, thermal performance of all cases with various twisted tapes is larger than 1 which means that utilizing twisted tape with various configurations leads to more thermal performance than plain tube. The thermal performances of case with dual square-cut twisted tapes (as the best case) for Re=10000 and 20000 are more than plain tube by about 16 and 12% improvement, respectively. Furthermore, for the case with perforated dual twisted tape (as the case with lowest thermal performance), the thermal performances for Re=10000 and 20000 are more than plain tube by about 9.2 and 7% improvement, respectively.

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Numerical study of enhancing vehicle radiator performance using different porous fin configurations and materials

Cited by 13 publications

References 25 publications

Compound Heat Transfer Augmentation of a Shell-and-Coil Ice Storage Unit with Metal-Oxide Nano Additives and Connecting Plates

Compound Heat Transfer Augmentation of a Shell-and-Coil Ice Storage Unit with Metal-Oxide Nano Additives and Connecting Plates

Accelerating the charging process in a shell and dual coil ice storage unit equipped with connecting plates

Numerical Investigation of Non-Uniform Heat Transfer Enhancement in Parabolic Trough Solar Collectors Using Dual Modified Twisted-Tape Inserts

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