The effect of surface roughness and emissivity on radiator output

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The effect of surface roughness and emissivity on radiator output. / Shati, A. K.A.; Blakey, S. G.; Beck, S. B.M.

In: Energy and Buildings, Vol. 43, No. 2-3, 02.2011, p. 400-406.

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Shati, A. K.A. ; Blakey, S. G. ; Beck, S. B.M. / The effect of surface roughness and emissivity on radiator output. In: Energy and Buildings. 2011 ; Vol. 43, No. 2-3. pp. 400-406.

Bibtex

@article{afb90991130a48249e200144f21a19da,
title = "The effect of surface roughness and emissivity on radiator output",
abstract = "The effect of altering the emissivity and the roughness of a wall behind a radiator on the radiator heat output has been studied experimentally and by using computational fluid dynamics. The results of a 3D RNG k-ε turbulent model agree well with, and have the same trend as, the experimental results. The results indicate that the presence of large scale surface roughness and a high emissivity surface increases both the heat flow rate and the air velocity behind the radiator compared to a smooth shiny surface. The former increases the wall surface emissivity which causes the surface temperature of the wall to increase, effectively creating additional convective heat transfer surface. The surface roughness will increase both the surface area for heat transfer and the turbulent intensity which increase the mass transfer and free convective heat flux through the air gap. The results indicate that the heat transfer can be increased by about 26% through the use of a high emissivity saw-tooth surface compared to a smooth shiny one. This means that using a wall surface with high roughness and emissivity behind the radiator will increase the heat output from the radiator.",
keywords = "Domestic panel radiators, Free convection, Heat transfer, Radiation, Surface emissivity, Surface roughness",
author = "Shati, {A. K.A.} and Blakey, {S. G.} and Beck, {S. B.M.}",
note = "Copyright: Copyright 2011 Elsevier B.V., All rights reserved.",
year = "2011",
month = feb,
doi = "10.1016/j.enbuild.2010.10.002",
language = "English",
volume = "43",
pages = "400--406",
journal = "Energy and Buildings",
issn = "0378-7788",
publisher = "Elsevier",
number = "2-3",

}

RIS

TY - JOUR

T1 - The effect of surface roughness and emissivity on radiator output

AU - Shati, A. K.A.

AU - Blakey, S. G.

AU - Beck, S. B.M.

N1 - Copyright: Copyright 2011 Elsevier B.V., All rights reserved.

PY - 2011/2

Y1 - 2011/2

N2 - The effect of altering the emissivity and the roughness of a wall behind a radiator on the radiator heat output has been studied experimentally and by using computational fluid dynamics. The results of a 3D RNG k-ε turbulent model agree well with, and have the same trend as, the experimental results. The results indicate that the presence of large scale surface roughness and a high emissivity surface increases both the heat flow rate and the air velocity behind the radiator compared to a smooth shiny surface. The former increases the wall surface emissivity which causes the surface temperature of the wall to increase, effectively creating additional convective heat transfer surface. The surface roughness will increase both the surface area for heat transfer and the turbulent intensity which increase the mass transfer and free convective heat flux through the air gap. The results indicate that the heat transfer can be increased by about 26% through the use of a high emissivity saw-tooth surface compared to a smooth shiny one. This means that using a wall surface with high roughness and emissivity behind the radiator will increase the heat output from the radiator.

AB - The effect of altering the emissivity and the roughness of a wall behind a radiator on the radiator heat output has been studied experimentally and by using computational fluid dynamics. The results of a 3D RNG k-ε turbulent model agree well with, and have the same trend as, the experimental results. The results indicate that the presence of large scale surface roughness and a high emissivity surface increases both the heat flow rate and the air velocity behind the radiator compared to a smooth shiny surface. The former increases the wall surface emissivity which causes the surface temperature of the wall to increase, effectively creating additional convective heat transfer surface. The surface roughness will increase both the surface area for heat transfer and the turbulent intensity which increase the mass transfer and free convective heat flux through the air gap. The results indicate that the heat transfer can be increased by about 26% through the use of a high emissivity saw-tooth surface compared to a smooth shiny one. This means that using a wall surface with high roughness and emissivity behind the radiator will increase the heat output from the radiator.

KW - Domestic panel radiators

KW - Free convection

KW - Heat transfer

KW - Radiation

KW - Surface emissivity

KW - Surface roughness

UR - http://www.scopus.com/inward/record.url?scp=78651441222&partnerID=8YFLogxK

U2 - 10.1016/j.enbuild.2010.10.002

DO - 10.1016/j.enbuild.2010.10.002

M3 - Article

AN - SCOPUS:78651441222

VL - 43

SP - 400

EP - 406

JO - Energy and Buildings

JF - Energy and Buildings

SN - 0378-7788

IS - 2-3

ER -