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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

NUMERICAL DETERMINATION OF EXTERNAL CONVECTIVE HEAT TRANSFER COEFFICIENTS FOR LOW-RISE BUILDINGS

Nathan Mendes
Thermal Systems Laboratory, Department of Mechanical Engineering, Pontifical Catholic University of Parana, R. Imaculada Conceicao, 1155, Curitiba-PR, 80.215-901, Brazil

M. Emmel
LST - Pontifical Catholic University of Paraná, Curitiba, Brazil

Marc O. Abadie
Catholic University of Parana, Center for Mathematical Sciences and Technology, Department of Mechanical Engineering, Brazil; University of La Rochelle, La Rochelle, 17071, Cedex 9, France

DOI: 10.1615/IHTC13.p23.10
12 pages

Аннотация

Building energy analysis are very sensitive to external convective heat transfer coefficients so that some researchers have conducted sensitivity calculations and proved that depending on the choice of those coefficients, energy demands estimation values can vary from 20 to 40 %. In this context, computational fluid dynamics calculations have been performed to predict convective heat transfer coefficients at the external surfaces of a simple shape low-rise building. Effects of wind velocity and orientation have been analyzed considering different surface-to-air temperature differences. Results show that the convective heat transfer coefficient value strongly depends on the wind velocity, that the wind direction has a notable effect for vertical walls and almost none for roofs and that the surface-to-air temperature difference has a negligible effect for wind velocity higher than 5 m/s.

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Measurement of fluid temperature with an arrangement of three thermocouples