Presentation on theme: "Civil, Environmental, and Architectural Engineering The University of Kansas 1 “Radiant Barrier Technology – A Must in Green Architecture” Mario A. Medina,"— Presentation transcript:
Civil, Environmental, and Architectural Engineering The University of Kansas 1 “Radiant Barrier Technology – A Must in Green Architecture” Mario A. Medina, Ph.D., P.E.
2 Introduction “ ” “Preventing the sun's radiation from entering through the roof can make a significant contribution to comfort and reduction in cooling bills/needs.” From: Sustainable Building Sourcebook Chapter: Energy
3 Definition A radiant barrier consists of a layer of metallic foil, with low emittance, that significantly reduces the transfer of heat energy radiated from “hotter” surfaces to “colder” surfaces (e.g., the deck of an attic to the attic floor). Among the benefits of installing radiant barriers are energy savings, $ savings, and comfort. (Source: Florida Solar Energy Center)
7 Radiant Barriers How they work: –Radiant barriers reduce radiated heat transfer rate by the combination of the low emittance/high reflectance properties of the foil.
8 Radiant Barriers Modes of Heat Transfer (Source: Btubusters)
9 Radiant Barriers Heat transfer schematic Radiant Barrier
10 Radiant Barriers In the present study, the performance of radiant barriers was assessed via: –Experiments Side by side monitoring of pre- and post-retrofit data. –Modeling Mathematical representation of thermal sciences that describe the processes that take place. Implemented using computer programming (e.g., FORTRAN). –Model/Experiment Validation