Influence of irradiance and ambient temperature on roof coating temperature and heat flux transferre to interior of building
Abstract
The following article presents an analysis of the influence of the irradiance and ambient temperature on the roof coating temperature. The roof coating temperature depends mainly on the optical properties of the coating material. Those properties are the reflectivity and emissivity. The roof surface temperature determines the heat flux through the roof into the interior of the building. Proper material selection for the coating of the roof can significantly decrease the surface temperature, and as a result, decrease the heat flux into the space just below the roof. During the calculations, the model of the heat exchange derived by the author for the flat roof was used. The paper includes results of heat calculations for two coating materials with different reflectivity coefficients. The calculations were made for the specific weather conditions.
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Author Biography
Zbigniew Zapalowicz received his M.Sc. degree in Mechanical Engineering (specialisation: Power systems and devices) from Mechanical Faculty, Technical University of Szczecin in 1979, PhD from Institute Fluid Flow Machinery, Gdańsk in 1989, DSc from Mechanical Faculty, Koszalin University of Technology in 2007 (with honors). Since 1980 he has been a researcher in the Department of Heat Engineering, Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology, Szczecin (earlier Technical University of Szczecin). He currently works as a professor and head of Thermodynamics Chair. His scientific interests focus on problems concerning multiphase flow (particularly on droplets structures on devices walls), RES (solar energy) and power efficiency of technical processes. He has participated in 10 national research projects, presenting results of his work at international and national conferences, published more than 150 scientific papers in international and national journals, book chapters, as well as conference proceedings. He is also the author of 2 monographs.
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