Intelligent Control Based Estimation of Heat Transfer Coefficient from Four Flat Tubes with Different Attack Air Angles

Eleiwi, Muhammad Asmail; Tahseen, Tahseen Ahmad; Ghareeb, Ahmed

doi:10.37934/arfmts.72.2.6578

Cited by 3 publications

(4 citation statements)

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“…According to the findings of computer analysis, the aforesaid factors significantly affect how quickly heat is transmitted. Many scholars [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] published their findings on the influence that various factors have on mixed convection heat transfer, natural convection, forced convection, and how it works.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Hydraulic Analysis of Mixed Convection in a Channel-Square Enclosure Assembly with Hemi-Sphere Source at the Bottom

Al-Gaheeshi¹,

Rashid²,

Eleiwi³

et al. 2023

IJHT

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The thermo-hydraulic analysis of laminar mixed convection (forced and natural) through a horizontal channel-enclosure assembly equipped with a heated hollow hemispherical source (constant power of 20 W) in the bottom of the enclosure and different inlet air velocities equivalent to Reynolds number ranged (2.8814, 14.407, 28.814, and 43.221) are obtained numerically with the help of COMSOL Program. The impact of altering the input air velocity on the thermo-hydraulic properties is explored here as part of the research project. Good agreement was found between the derived numerical findings and those already established in the literature. The pressure profile throughout the channel is not altered via the numerically simulated increase on the positive y-axis. Increasing the incoming air velocity increases the natural convection induced via the heated source, which in turn increases the blending of cold and hot air within the enclosure and reduces the temperature gradient across the channel. As a result of the circumstances preventing slippage, the channel area exhibits the characteristic velocity profile of laminar flow, which consists of zero velocity at the channel walls and the maximum velocity in the channel's middle. The area of the recirculating streamlines is expanded by the rise in the velocity of intake air. As the incoming air velocity increases, so does the average Nusselt number.

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Section: Introductionmentioning

confidence: 99%

Thermo-Hydraulic Analysis of Mixed Convection in a Channel-Square Enclosure Assembly with Hemi-Sphere Source at the Bottom

Al-Gaheeshi¹,

Rashid²,

Eleiwi³

et al. 2023

IJHT

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“…Adsorption technology system offers the benefits of employing environmentally friendly refrigerants and directly harnessing industrial waste heat or solar energy. [16][17][18][19] For instance, Aristov et al proposed a series of novel composite selective water sorbents (SWS) with the goal of enhancing the adsorption capability of the adsorber. This was accomplished by enclosing a hygroscopic salt within the unoccupied pores of the adsorber material, such as silica gel.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Chilled and Hot Water Inlet Temperature, and Mass Flow Rate Influence on Energy and Exergy Efficiency in a Prismatic Adsorbent Bed Cooling Systems

Shakir,

Ghareeb,

Güngör

2023

Energy Tech

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Adsorption technologies offer a promising solution for managing high electricity demand in building by leveraging waste heat recovery and renewable energy sources. The prismatic adsorbent bed adsorption water cooling system investigates energy and exergy analyses for cooling application. With hot water temperature of 80 °C, cooling water inlet temperature 30 °C, and chilled water inlet temperature 14 °C, the system achieves an energy efficiency of 45.2% while demonstrating an energy storage density of ≈340 kJ kg−1. As a result, the exergy efficiency reaches 12.2%, and the mass fraction at the end of the adsorption process is a significant value of 0.13kgadsorbate/kgadsorbent. Increasing the water mass flow rate in the evaporator results in a decrease in exergy efficiency, while simultaneously causing an increase in energy efficiency. With an increase in the chilled water inlet temperature of the evaporator and the hot water inlet temperature of the adsorbent bed, there is an increase in the energy storage density, energy efficiency, and exergy destruction due to irreversibility and losses. According to this study, the impact of the chilled water inlet temperature on the energy and exergy performances of the evaporator is more significant compared to the effect of the water mass flow rate.

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“…According to previously published studies in the literature, the influence of the shape of the tube and configuration can have a positive impact on heat transfer. [4][5][6][7][8] Rocha et al 9 expanded on a mathematical model for hybrid configurations of elliptical and circular tube finned conservation of energy and heat transfer coefficients acquired experimentally using the technique of sublimation of naphthalene and part of similarity with the heat and mass transfer. Bahaidarah et al 10 investigated the numerically steady, incompressible, laminar twodimensional (2D) flow over a flat tube array for both staggered as well as in-line arrangements.…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, the design parameters of tube heat exchangers are the external tube heat transfer coefficient and the external flow pressure drop. According to previously published studies in the literature, the influence of the shape of the tube and configuration can have a positive impact on heat transfer 4‐8 . Rocha et al 9 expanded on a mathematical model for hybrid configurations of elliptical and circular tube finned conservation of energy and heat transfer coefficients acquired experimentally using the technique of sublimation of naphthalene and part of similarity with the heat and mass transfer.…”

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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Intelligent Control Based Estimation of Heat Transfer Coefficient from Four Flat Tubes with Different Attack Air Angles

Cited by 3 publications

References 0 publications

Thermo-Hydraulic Analysis of Mixed Convection in a Channel-Square Enclosure Assembly with Hemi-Sphere Source at the Bottom

Thermo-Hydraulic Analysis of Mixed Convection in a Channel-Square Enclosure Assembly with Hemi-Sphere Source at the Bottom

Experimental Investigation of Chilled and Hot Water Inlet Temperature, and Mass Flow Rate Influence on Energy and Exergy Efficiency in a Prismatic Adsorbent Bed Cooling Systems

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

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