GEOTHERMAL TECHNOLOGIES LEGACY COLLECTION - Bibliographic Citation


Bibliographic Citation



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Full Text: Citation URL: http://www.osti.gov/geothermal/product.biblio.jsp?osti_id=1051278
Title: Key Elements of and Materials Performance Targets for Highly Insulating Window Frames
Creator/Author: Gustavsen, Arild ; Grynning, Steinar ; Arasteh, Dariush ; Jelle, Bjorn Petter ; Goudey, Howdy
Publication Date:2011 Mar 28
OSTI Identifier:OSTI 1051278
Report Number(s):LBNL-5099E
DOE Contract Number:DE-AC02-05CH11231
Document Type:Journal Article
Specific Type:
Coverage:
Resource Relation:Journal Name: Energy and Buildings; Journal Volume: 43; Journal Issue: 10; Related Information: Journal Publication Date: October 2011
Other Number(s):
Research Org:Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:Environmental Energy Technologies Division
Subject:15 GEOTHERMAL ENERGY; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 29 ENERGY PLANNING, POLICY AND ECONOMY; 54 ENVIRONMENTAL SCIENCES; DESIGN; ENERGY BALANCE; FLOORS; MARKET; PERFORMANCE; ROOFS; SIMULATION; SPACERS; TARGETS; U VALUES; WALLS; WINDOW FRAMES; WINDOWS
Keywords:Fenestration, window frames, heat transfer modeling, U-factor, thermal transmittance, thermal performance
Description/Abstract:The thermal performance of windows is important for energy efficient buildings. Windows typically account for about 30-50 percent of the transmission losses though the building envelope, even if their area fraction of the envelope is far less. The reason for this can be found by comparing the thermal transmittance (U-factor) of windows to the U-factor of their opaque counterparts (wall, roof and floor constructions). In well insulated buildings the U-factor of walls, roofs an floors can be between 0.1-0.2 W/(m2K). The best windows have U-values of about 0.7-1.0. It is therefore obvious that the U-factor of windows needs to be reduced, even though looking at the whole energy balance for windows (i.e. solar gains minus transmission losses) makes the picture more complex.In high performance windows the frame design and material use is of utmost importance, as the frame performance is usually the limiting factor for reducing the total window U-factor further. This paper describes simulation studies analyzing the effects on frame and edge-of-glass U-factors of different surface emissivities as well as frame material and spacer conductivities. The goal of this work is to define materials research targets for window frame components that will result in better frame thermal performance than is exhibited by the best products available on the market today.
Publisher:
Country of Publication:US
Language:English
Size/Format:Medium: ED; Size: 20
Rights:
Availability:
System Entry Date:2012 Dec 05
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