Convective heat transfer in hemispherical cavities with planar inner surfaces

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TypeArticle
Journal titleASHRAE Transactions
Volume117
Issue2
Pages132; # of pages: 32
SubjectTubular daylighting device, skylight, hygIRC-C model, natural convection, hemispherical cavity, domed cavity
AbstractDomed cavities are found in many applications in buildings, particularly in conventional skylights and tubular daylighting devices. Heat transfer through domed cavities is thus an important factor in evaluating the energy performance rating of such skylight systems, and in calculating the heating and cooling loads of buildings. Although there have been many studies on the convective heat transfer in related geometries, there is very limited information on natural convective heat transfer in domed cavities with planar inner surfaces. In this paper, a numerical study is conducted on natural laminar convective heat transfer in horizontal domed cavities with planar inner surfaces. The bounding surfaces are subject to uniform temperature conditions. The numerical model is based on the finite element method. The model predictions are successfully compared with published data in literature for concentric spheres and hemispherical cavities. The results show that for different boundary temperature conditions, the airflow in the cavities is mono-cellular and reaches steady state conditions for both cold and hot weather conditions. The numerical results are used to develop practical correlations for the Nusselt number.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NoteThis paper is based on findings resulting from ASHRAE Research Project RP-1415
Peer reviewedYes
NRC number42679
21337
NPARC number20374637
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Record identifierd9a1d96a-bc08-4772-994a-948a4df92f22
Record created2012-07-23
Record modified2016-05-09
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