State of the art on flow and heat transfer performance of compact fin-and-tube heat exchangers

Adam, Abdalazeem; Oumer, A. N.; Najafi, G.; Ishak, M.; Firdaus, M. A.; Aklilu, Tesfamichael Baheta

doi:10.1007/s10973-019-08971-6

Cited by 29 publications

(11 citation statements)

References 165 publications

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“…However, it is not necessary for this research. Adam et al [20], in a state-of-the-art paper, shows studies of local HTCs and local heat/mass transfers coefficients.…”

Section: Introductionmentioning

confidence: 99%

Thermal Calculations of Four-Row Plate-Fin and Tube Heat Exchanger Taking into Account Different Air-Side Correlations on Individual Rows of Tubes for Low Reynold Numbers

Marcinkowski

Taler

et al. 2021

Energies

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Currently, when designing plate-fin and tube heat exchangers, only the average value of the heat transfer coefficient (HTC) is considered. However, each row of the heat exchanger (HEX) has different hydraulic–thermal characteristics. When the air velocity upstream of the HEX is lower than approximately 3 m/s, the exchanged heat flow rates at the first rows of tubes are higher than the average value for the entire HEX. The heat flow rate transferred in the first rows of tubes can reach up to 65% of the heat output of the entire exchanger. This article presents the method of determination of the individual correlations for the air-side Nusselt numbers on each row of tubes for a four-row finned HEX with continuous flat fins and round tubes in a staggered tube layout. The method was built based on CFD modelling using the numerical model of the designed HEX. Mass average temperatures for each row were simulated for over a dozen different airflow velocities from 0.3 m/s to 2.5 m/s. The correlations for the air-side Nusselt number on individual rows of tubes were determined using the least-squares method with a 95% confidence interval. The obtained correlations for the air-side Nusselt number on individual rows of tubes will enable the selection of the optimum number of tube rows for a given heat output of the HEX. The investment costs of the HEX can be reduced by decreasing the tube row number. Moreover, the operating costs of the HEX can also be lowered, as the air pressure losses on the HEX will be lower, which in turn enables the reduction in the air fan power.

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“…However, it is not necessary for this research. Adam et al [20], in a state-of-the-art paper, shows studies of local HTCs and local heat/mass transfers coefficients.…”

Section: Introductionmentioning

confidence: 99%

Thermal Calculations of Four-Row Plate-Fin and Tube Heat Exchanger Taking into Account Different Air-Side Correlations on Individual Rows of Tubes for Low Reynold Numbers

Marcinkowski

Taler

et al. 2021

Energies

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“…Heat exchangers with flat tubes are expected to have a minimized pressure drop of air-side and the best air-side heat transfer coefficients compared with the classic tube shape (circular) heat exchangers. 2,3 It is expected that the friction factor less than that for classic tubes due a wake region is smaller.…”

Section: Introductionmentioning

confidence: 99%

“…The latest developments in automotive‐welded aluminum industrialization technology have made the cost of the heat exchanger with flat tube construction more affordable. Heat exchangers with flat tubes are expected to have a minimized pressure drop of air‐side and the best air‐side heat transfer coefficients compared with the classic tube shape (circular) heat exchangers 2,3 . It is expected that the friction factor less than that for classic tubes due a wake region is smaller.…”

Section: Introductionmentioning

confidence: 99%

Effect of front air attack angles on heat transfer coefficient of the cross‐flow of four flat tube

et al. 2020

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Heat transfer coefficients are studied experimentally for airflow over a four-flat-tube configuration with different inlet attack angles. The range of Re numbers was from 1668 to 3782. The heat fluxes are 13.2, 38.5, and 99.8 W/m 2. In this paper, 45 samples of a flat tube with inlet airflow angles (30°, 45°, and 90°) are set up to investigate its thermal performance. The design of experimental approach was used to conduct the heat transfer parametric study by designing 45 experiments, analyzing the empirical model, and optimizing heat transfer. The response was modeled using a general factorial design model based on experimental data. From analysis of variance (ANOVA), we obtained significant coefficients by performing the 5% test of level of significance. The results indicated that both the Nu and Re numbers increase for all heat flux cases and these decrease with increasing the air attack. Also shown are that the Colburn j-factor decreases with increase of air velocity. It was found that the ANOVA results are appropriate to the collected experimental data, as the R 2 and R 2-adjusted statistics are found to be 92.61% and 90.97%, respectively, for Nu number. In a similar manner, for Colburn j-factor, the R 2 and R 2adjusted statistic are 96.97% and 96.29%, respectively.

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“…A study on a plate HE has been performed by Sodagar-Abardeh et al [12] to find flow characteristics and optimum geometry of it by using the genetic algorithm. Also, a review on thermal and flow characteristics of compact fin-and-tube HEs has been performed by Adam et al [13].…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Fields inside S-Shaped Baffled-Channel Air-Heat Exchangers

Menni

Lorenzini

Kumar

et al. 2021

Mathematical Problems in Engineering

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A numerical study of an especial heat exchanger (HE) equipped with complicated geometry baffles was performed in this research study. This shell-and-tube HE could be applied in various engineering applications like solar collectors. It can be acknowledged that generating longitudinal vortices in the flow results in enhancing the turbulent convective heat transfer. In order to generate these vortices, S-shaped baffles can be applied. It should be noted that computational analysis of shell-and-tube HEs is considered a challenging task due to these vortices. So, in this study, a commercial CFD software has been used for solving the problem and important equation and numerical approach used in the simulation have been explained. The aerodynamic aspect with respect to stream function, mean, axial, and transverse velocities, dynamic pressure, turbulent dissipation rate, turbulence kinetic energy, turbulent viscosity, and turbulence intensity fields was included in this research. This study reports many physical phenomena, such as the turbulence, instability, flow separation, and the appearance of reverse secondary currents. The average speed changed in different areas, where it is low next to the baffles. Velocity amounts are paramount around the upper channel’s wall, starting from the upper left side of the last baffle to the exit. This increase in velocity can be justified by a reduction in flow area and pressure augmentation.

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State of the art on flow and heat transfer performance of compact fin-and-tube heat exchangers

Cited by 29 publications

References 165 publications

Thermal Calculations of Four-Row Plate-Fin and Tube Heat Exchanger Taking into Account Different Air-Side Correlations on Individual Rows of Tubes for Low Reynold Numbers

Thermal Calculations of Four-Row Plate-Fin and Tube Heat Exchanger Taking into Account Different Air-Side Correlations on Individual Rows of Tubes for Low Reynold Numbers

Effect of front air attack angles on heat transfer coefficient of the cross‐flow of four flat tube

Aerodynamic Fields inside S-Shaped Baffled-Channel Air-Heat Exchangers

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