Experimental validation for thermal transmittances of window shading systems with perimeter gaps
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%. These tolerances are similar to those obtained from sealed cavity comparisons and are deemed acceptable within the ISO 15099 framework.
- Authors:
-
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
- OSTI Identifier:
- 1456998
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Building Performance Simulation
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 6; Journal ID: ISSN 1940-1493
- Publisher:
- Taylor & Francis
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; building energy; windows; window attachments; shading; U-factor; heat transfer
Citation Formats
Hart, Robert, Goudey, Howdy, and Curcija, D. Charlie. Experimental validation for thermal transmittances of window shading systems with perimeter gaps. United States: N. p., 2018.
Web. doi:10.1080/19401493.2018.1436192.
Hart, Robert, Goudey, Howdy, & Curcija, D. Charlie. Experimental validation for thermal transmittances of window shading systems with perimeter gaps. United States. https://doi.org/10.1080/19401493.2018.1436192
Hart, Robert, Goudey, Howdy, and Curcija, D. Charlie. Thu .
"Experimental validation for thermal transmittances of window shading systems with perimeter gaps". United States. https://doi.org/10.1080/19401493.2018.1436192. https://www.osti.gov/servlets/purl/1456998.
@article{osti_1456998,
title = {Experimental validation for thermal transmittances of window shading systems with perimeter gaps},
author = {Hart, Robert and Goudey, Howdy and Curcija, D. Charlie},
abstractNote = {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%. These tolerances are similar to those obtained from sealed cavity comparisons and are deemed acceptable within the ISO 15099 framework.},
doi = {10.1080/19401493.2018.1436192},
journal = {Journal of Building Performance Simulation},
number = 6,
volume = 11,
place = {United States},
year = {2018},
month = {2}
}
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