Experimental validation for thermal transmittances of window shading systems with perimeter gaps

Experimental validation for thermal transmittances of window shading systems with perimeter gaps

TitleExperimental validation for thermal transmittances of window shading systems with perimeter gaps
Publication TypeJournal Article
Year of Publication2018
AuthorsRobert Hart, Howdy Goudey, D. Charlie Curcija
JournalJournal of Building Performance Simulation
Pagination1 - 13
Date Published02/2018
ISSN1940-1493
Abstract

Virtually all residential and commercial windows in the U.S. have some form of window attachment, but few have been designed for energy savings. ISO 15099 presents a simulation framework to determine thermal performance of window attachments, but the model has not been validated for these products. This paper outlines a review and validation of the ISO 15099 centre-of-glass heat transfer correlations for perimeter gaps (top, bottom, and side) in naturally ventilated cavities through measurement and simulation. The thermal transmittance impact due to dimensional variations of these gaps is measured experimentally, simulated using computational fluid dynamics, and simulated utilizing simplified correlations from ISO 15099. Results show that the ISO 15099 correlations produce a mean error between measured and simulated heat flux of 2.5 +/- 7 percent. These tolerances are similar to those obtained from sealed cavity comparisons and are deemed acceptable within the ISO 15099 framework.

DOI10.1080/19401493.2018.1436192
Short TitleJournal of Building Performance Simulation