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Heat Transfer Research
Fator do impacto: 0.404 FI de cinco anos: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019018679
Forthcoming Article

A computational study focused on revealing the relation between convective and radiative heat transfer from a radiant heated wall

Ozgen Acikgoz
Yildiz Technical University

RESUMO

Asymmetric thermal radiation is a major reason deteriorating thermal comfort in living environments, and is caused by wide windows, cold surfaces arising from uninsulated walls, or ceilings, and walls exposed to solar radiation. This leads different parts of human body to face with surfaces having different temperatures and thus discrete simultaneous radiation gains or losses that bring about discomfort. In the present investigation, to simulate this thermal discomfort condition, realistic thermal boundary conditions, emissivity values, and floor dimensions are selected and applied to an enclosure, afterward characteristics pertaining to a heated wall, such as the proportion of radiative to convective heat transfer coefficient alongside radiative and total heat flux are examined. To achieve this purpose, a computational fluid dynamics approach for convective data, and a theoretical calculation method for the solution of radiation heat transfer within the chamber are utilized. It was revealed that as the distance between heated wall, and the opposite wall -forming a heat sink that generates an asymmetric thermal radiation- increases from 3 m to 4 m, and to 6 m, the radiative heat transfer coefficient decreases and thus, the proportion (hr / hc) range also narrows from 1.10-1.70 to 1.10-1.55 due to dwindling effects of radiation. Furthermore, three novel correlations comprising the effect of asymmetric radiation in the chamber have been derived for the ratio of (hr / hc), radiative heat flux (qr), and total heat flux (qt) of which deviation ranges remain within ±15%, ±10%, and ±15%, respectively.