DETERMINATION OF CONVECTIVE, RADIATIVE, AND TOTAL HEAT TRANSFER CHARACTERISTICS OVER A RADIANT HEATED CEILING: A COMPUTATIONAL APPROACH


Açıkgöz Ö.

JOURNAL OF THERMAL ENGINEERING, cilt.5, ss.372-384, 2019 (ESCI İndekslerine Giren Dergi)

  • Cilt numarası: 5 Konu: 5
  • Basım Tarihi: 2019
  • Doi Numarası: 10.18186/thermal.623191
  • Dergi Adı: JOURNAL OF THERMAL ENGINEERING
  • Sayfa Sayısı: ss.372-384

Özet

In the present study, a computational investigation is carried out within a model room of which dimensions has also been given in international standards for experimental approaches. In accordance with the experimental standards, the analyses are realized at the room dimensions of (L x H x W= 4 x 3 x 4 m), and at the thermal boundary conditions of (T-c = 35 - 50 degrees C), (T-w = 15 - 24 degrees C), (T-f = 15 - 24 degrees C). As a result of iterations conducted using a computational fluid dynamics package program code, each corresponding to a case study, convective, radiative, and total heat fluxes from radiant heated ceiling are obtained, and afterward using relevant reference temperature proposed in the literature, heat transfer coefficients pertaining to convection, radiation, and total heat transfer have been found. In conclusion, average heat flux values of 95.83 Wm(-2) and 17.49 Wm(-2) are gained through the examined radiant heated ceiling, by means of radiation and convection, respectively. This denotes that roughly 85% of total heat transfer from the ceiling arises through radiation that is very compatible with the relevant literature. Finally, spanning the entire different case studies, average convective, radiative, and total heat transfer coefficients of 1.1 Wm(-)(2)K(-1), 5.4 Wm(-2)K(-1), 7.6 Wm K--2(-1) are acquired.