Energy conservation through interior shading of windows: an analysis, test, and evaluation of reflective venetian blinds
Windows admit radiant and conducted heat energy as well as light and, for this reason, effective means for control is mandatory. Venetian blinds, providing continuous solar control, are ideal for energy efficient windows. They may be closed in the summer to block out undesirable solar radiation and opened in the winter to admit the valuable energy of the sun while providing year-round glare free illumination. Architects, engineers, and manufacturers have been reluctant to promote the use of venetian blinds as energy saving products because of remaining uncertainties in the technology. This cooperative program involving industry, government, and a university research team has developed predictive equations and has confirmed their ability to accurately predict shading coefficients through experiments in an environmental simulator with an artificial sun. Ten venetian blinds with a wide range of surface finishes, including gloss and Satin finish paints, polished aluminum, chrome deposition, and units with different colors on the upper and lower surfaces of the slats were included in the experimental work. The effect of solar incidence and slat angle on blind reflectance and shading coefficient was determined. The impact of varying incidence and slat angle on building energy load is discussed.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5328034
- Report Number(s):
- LBL-14369; EEB-W-82-04; ON: DE82015125
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
29 ENERGY PLANNING, POLICY, AND ECONOMY
291000 -- Energy Planning & Policy-- Conservation
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320100* -- Energy Conservation
Consumption
& Utilization-- Buildings
BUILDINGS
CONTROL
DATA
DESIGN
EFFICIENCY
ENERGY EFFICIENCY
ENERGY TRANSFER
EVALUATED DATA
EVALUATION
EXPERIMENTAL DATA
HEAT GAIN
HEAT TRANSFER
INFORMATION
NUMERICAL DATA
OPENINGS
OPTICAL PROPERTIES
PERFORMANCE TESTING
PHYSICAL PROPERTIES
REFLECTIVITY
SHADING
SUN SHADES
SURFACE PROPERTIES
TESTING
WINDOWS
291000 -- Energy Planning & Policy-- Conservation
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320100* -- Energy Conservation
Consumption
& Utilization-- Buildings
BUILDINGS
CONTROL
DATA
DESIGN
EFFICIENCY
ENERGY EFFICIENCY
ENERGY TRANSFER
EVALUATED DATA
EVALUATION
EXPERIMENTAL DATA
HEAT GAIN
HEAT TRANSFER
INFORMATION
NUMERICAL DATA
OPENINGS
OPTICAL PROPERTIES
PERFORMANCE TESTING
PHYSICAL PROPERTIES
REFLECTIVITY
SHADING
SUN SHADES
SURFACE PROPERTIES
TESTING
WINDOWS