A superwindow field demonstration program in northwest Montana
Of all building envelope elements, windows always have had the highest heat loss rates. However, recent advances in window technologies such as low-emissivity (low-E) coatings and low-conductivity gas fillings have begun to change the status of windows in the building energy equation, raising the average R-value (resistance to heat flow) from 2 to 4 h-ft{sup 2}-{degree}F/Btu. Building on this trend and using a novel combination of low-E coatings, gas-fills, and three glazing layers, the authors developed a design concept for R-6 to R-10 super'' windows. Three major window manufacturers produced prototype superwindows based on this design for testing and demonstration in three utility-sponsored and -monitored energy-conserving homes in northwestern Montana. This paper discusses the design and tested performance of these three windows and identifies areas requiring further research if these window concepts are to be successfully developed for mass markets. 11 refs., 3 figs., 3 tabs.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- DOE/CE; DOE/MA
- DOE Contract Number:
- AC03-76SF00098; AI79-86BP63401
- OSTI ID:
- 5425290
- Report Number(s):
- LBL-26069; CONF-891202-6; ON: DE90003268
- Resource Relation:
- Conference: 4. thermal performance of the exterior envelopes of buildings, Orlando, FL (USA), 4-7 Dec 1989
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
29 ENERGY PLANNING
POLICY AND ECONOMY
WINDOWS
PERFORMANCE TESTING
COATINGS
DEMONSTRATION PROGRAMS
ENERGY CONSERVATION
ENERGY EFFICIENCY
GLAZING
R FACTORS
THERMAL CONDUCTIVITY
COVERINGS
EFFICIENCY
OPENINGS
PHYSICAL PROPERTIES
TESTING
THERMODYNAMIC PROPERTIES
320107* - Energy Conservation
Consumption
& Utilization- Building Systems- (1987-)
290500 - Energy Planning & Policy- Research
Development
Demonstration
& Commercialization