The Effect of Surface Thermal Radiation on Heat Transfer in a Ventilated Cavity

Navarro, Jorge; Hinojosa, J.F.; Piña-Ortiz, A.; Xamán, J.

doi:10.1115/1.4046530

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…Velusami et al 35 concluded that surface radiation interaction leads to more significant velocity magnitudes and turbulence intensities at the boundary layers, increasing convective heat transfer by 25%. Navarro et al 36 reached that experimental heat transfer coefficients showed a significant effect of thermal radiation. When the walls’ emissivity rose from 0.03 to 0.98, it went up significantly.…”

Section: Resultsmentioning

confidence: 97%

Modelling heat transfer and fluid flow in a ship engine room using CFD analysis to evaluate and improve ventilation

Salmani

Hosseini

Khani

2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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Considering that about 90% of international trade is transported via sea and ship ventilation systems consume between 3.5% and 5.5% of the ship’s rated power, ship energy consumption is of particular interest and modelling and enhancing ventilation systems are vital to reducing and optimising energy consumption. Using Computational Fluid Dynamics (CFD) simulation, modelling heat transfer and airflow patterns helped us improve the ventilation system and temperature distribution, provide thermal comfort for staff and equipment, and increase energy efficiency. We discussed the radiation effect in CFD analysis; it affected wall temperatures significantly and temperature contours to some extent; it raised air temperatures by 3 K and wall temperatures by 14 K in some areas; this issue has not been considered in previous analyses. Considering seven different engine room configurations, we analysed temperature distribution, air terminal streamlines and other parameters to choose the best. We examined four energy-saving plans for the best configuration, and airflow was reduced by 13.8% and fan power by 36% based on the temperature distribution. By improving the engine room ventilation system, average engine room temperature, heat removal efficiency, combustion air temperature, and temperature distribution developed. The analysis of air terminals included assessing their streamlines, determining areas they circulated, and customising their airflow; in addition to vertical and horizontal air terminals at the top or bottom of the engine room, we also examined a separate air terminal for engine combustion air, this tool has been used very little before.

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Section: Resultsmentioning

confidence: 97%

Modelling heat transfer and fluid flow in a ship engine room using CFD analysis to evaluate and improve ventilation

Salmani

Hosseini

Khani

2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…El-Sherbiny et al [5] and Kim et al [6] numerically verified that the wall surface emissivity of a cavity affects its heat transfer dramatically. Based on different numerical methods, references [7][8][9][10][11] indicate that the average Nu increases with increasing surface emissivity in a cavity. References [12][13][14][15] investigated the relationship between the radiation effect and the heat transfer in the cavity based on different numerical models.…”

Section: Introductionmentioning

confidence: 99%

Radiation Effect on Heat Transfer in Narrow Cavities

Zhou

Sun

et al. 2023

Energies

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The thermal comfort and air-conditioning energy consumption of vehicles or trains are dependent on the thermal resistance of its envelopes, which could be enhanced by improving the radiation characteristics of the narrow cavities scattered in their envelopes. However, the study for a feasible method and its effectiveness has been given little attention. This paper introduces a method that involves pasting aluminum foil on the inner wall to change the radiation characteristics of the narrow cavity and analyzed its effects on narrow-cavity heat transfer by experimental and numerical methods. The results indicate that the radiation effect on heat transfer in a narrow cavity made of conventional material is dominant, with a rate larger than 75%, and that pasting aluminum foil is an effective and feasible method of weakening the radiation rate in narrow-cavity heat transfer, decreasing it to less than 10%. This paper will provide a reference to improve the insulation characteristics of vehicle enclosure.

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The Effect of Surface Thermal Radiation on Heat Transfer in a Ventilated Cavity

Cited by 2 publications

References 18 publications

Modelling heat transfer and fluid flow in a ship engine room using CFD analysis to evaluate and improve ventilation

Modelling heat transfer and fluid flow in a ship engine room using CFD analysis to evaluate and improve ventilation

Radiation Effect on Heat Transfer in Narrow Cavities

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