A new three-dimensional CFD model for efficiency optimisation of fluid-to-air multi-fin heat exchanger

Altwieb, Miftah Omar; Kubiak, Krzysztof; Aliyu, Aliyu M.; Mishra, Rakesh

doi:10.1016/j.tsep.2020.100658

Cited by 13 publications

(7 citation statements)

References 29 publications

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“…The dimensionless parameters used to develop the predictive correlation are, as mentioned earlier, the Reynolds number, Re D and the ratio between total fin surface area to the total heat transfer surface area A f /A t of the heat exchanger which is a design parameter used by Palmer et al [26] that can be used for estimating heat transfer areas needed for a given amount of heat to be transmitted. Other authors have used similar dimensionless groupings to correlate the heat transfer properties of fin and tube heat exchangers [13,17,18]. The newly derived equations are as follows: j = 10…”

Section: Development Of New Empirical Relations For Fanning F and Colburn J-factormentioning

confidence: 99%

“…Figure 7c,d In order to account for geometric variations of the fins (their spacing F p , longitudinal pitch L p and transverse pitch T p ), validated CFD data (previously reported in ref. [18]) was combined with the experimental data obtained in this study to generate new empirical correlations for j and f for the plain fin model using nonlinear least squares regression. The longitudinal pitches considered were 20, 22 and 24 mm; transverse pitches were 23.5, 25 and 26.5 mm; while the fin spacings investigated were 3.7, 4.2 and 4.7 mm at air Reynolds numbers of 6000 to 32,000.…”

Section: Development Of New Empirical Relations For Fanning F and Colburn J-factormentioning

confidence: 99%

“…Altwieb et al [18] assessed the thermal performance of a multi-tube heat exchanger with plain fins and having different geometrical modification using three-dimensional CFD simulations. Three enhancements were analysed.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Enhancement by Perforated and Louvred Fin Heat Exchangers

Altwieb¹,

Mishra

Aliyu

et al. 2022

Energies

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Multi-tube multi-fin heat exchangers are extensively used in various industries. In the current work, detailed experimental investigations were carried out to establish the flow/heat transfer characteristics in three distinct heat exchanger geometries. A novel perforated plain fin design was developed, and its performance was evaluated against standard plain and louvred fins designs. Experimental setups were designed, and the tests were carefully carried out which enabled quantification of the heat transfer and pressure drop characteristics. In the experiments the average velocity of air was varied in the range of 0.7 m/s to 4 m/s corresponding to Reynolds numbers of 600 to 2650. The water side flow rates in the tubes were kept at 0.12, 0.18, 0.24, 0.3, and 0.36 m3/h corresponding to Reynolds numbers between 6000 and 30,000. It was found that the louvred fins produced the highest heat transfer rate due to the availability of higher surface area, but it also produced the highest pressure drops. Conversely, while the new perforated design produced a slightly higher pressure drop than the plain fin design, it gave a higher value of heat transfer rate than the plain fin especially at the lower liquid flow rates. Specifically, the louvred fin gave consistently high pressure drops, up to 3 to 4 times more than the plain and perforated models at 4 m/s air flow, however, the heat transfer enhancement was only about 11% and 13% over the perforated and plain fin models, respectively. The mean heat transfer rate and pressure drops were used to calculate the Colburn and Fanning friction factors. Two novel semiempirical relationships were derived for the heat exchanger’s Fanning and Colburn factors as functions of the non-dimensional fin surface area and the Reynolds number. It was demonstrated that the Colburn and Fanning factors were predicted by the new correlations to within ±15% of the experiments.

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Section: Development Of New Empirical Relations For Fanning F and Colburn J-factormentioning

confidence: 99%

Section: Development Of New Empirical Relations For Fanning F and Colburn J-factormentioning

confidence: 99%

See 1 more Smart Citation

Heat Transfer Enhancement by Perforated and Louvred Fin Heat Exchangers

Altwieb¹,

Mishra

Aliyu

et al. 2022

Energies

Self Cite

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“…For each geometry, the study was completed and general correlations were obtained. As a result, the elliptical shape has come across as the most efficient [17][18][19]. In a study on circuitry, Hussam Jouhara et al, both experimentally and theoretically, examined the effect on performance by having different circuit numbers and number of passes to increase heat transfer.…”

Section: Literature Reviewmentioning

confidence: 99%

Investigation of number and methods of circuits in finned tube heat exchangers

TEMEL¹

2022

Recent Adv Sci Eng

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In recently, the importance of energy saving and, accordingly, optimization studies are increasing day by day. In addition, energy saving, and optimization studies are seriously discussed in heating and cooling applications. Fan coil devices, known as cooling devices, have also been seriously included in the studies in this context. With the developed regulation conditions, this development in both the combi boiler (heating) used, the air conditioner and larger cooling devices are mostly shifting towards water systems. Global warming has brought heating and cooling applications to the fore in aqueous systems due to gases formed because of combustion and other atmospheric polluting factors. In this study, the effect of the number of circuits on the heating process and the circuit methods in fan coil devices designed as 2 pipes in water systems were examined. By including different fin types and pipe diameters, the effect of both fin type and pipe diameter has been directly revealed in the experimental studies. In addition, with this study, the effect of the change in the number of circuits on the total heating capacity, the effect on the outlet air temperature and the change in water side pressure loss are conveyed. All experimental studies were carried out under the same conditions and air and water side conditions specified by Eurovent. Considering three different air flow rates, the relationship between air flow and heating capacity is also revealed. The pump power was compared according to the capacity obtained and the air flow rate, and its effect was correlated in energy saving and optimization studies. All these factors were brought together and the number of circuits, circuit method, fin type, pipe diameter, air velocity and pump power were evaluated together in the heat exchanger design in the heating process.

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“…Many researchers have worked on the analysis of heat exchangers using computational fluid dynamics method [3][4][5][6][7]. Doğan et al, [8] compared the thermal and hydraulic performances of circular and elliptical tube heat exchangers using computational fluid dynamics method.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer analysis of double tube heat exchanger with wavy inner tube

Hasgül

Çakmak

2022

THERM SCI

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In this study, the effect of the design on the heat transfer is numerically investigated by using the "wavy inner tube" in a double-pipe heat exchanger. A wavy inner tube was used in the design to give a turbulent effect to the fluid along the inner tube of a double tube heat exchanger. In numerical study, ANSYS 12.0 Fluent code program was used, and the basic protection equations were solved for steady-state, three-dimensional and turbulent flow conditions. The study was examined at Reynolds numbers ranging from 2700 to 5300. The obtained results were compared with the experimental data performed under the same conditions. As a result of this comparison, after it was seen that the results obtained from the numerical analysis and the experimental results were compatible with each other, the wave number of the inner tube was increased and analyzed with the ANSYS fluent code program. When the data obtained as a result of the analyzes were evaluated, it was seen that the highest heat transfer was obtained from the 16 wave tube heat exchanger, which has the highest number of waves and under counter flow conditions. The increase in heat transfer increased by 270% compared to the straight tube.

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A new three-dimensional CFD model for efficiency optimisation of fluid-to-air multi-fin heat exchanger

Cited by 13 publications

References 29 publications

Heat Transfer Enhancement by Perforated and Louvred Fin Heat Exchangers

Heat Transfer Enhancement by Perforated and Louvred Fin Heat Exchangers

Investigation of number and methods of circuits in finned tube heat exchangers

Heat transfer analysis of double tube heat exchanger with wavy inner tube

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