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Auto Solar Control
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English
Abstract
Automobiles of the future will have more glass area and will require better fuel economy. On a current sports car 70% of the load on the air conditioner is due to solar heating through the glass areas when the car is in direct sunlight. This will increase with cars currently on the drawing board. More power will be needed for the air conditioner unless the load is reduced by solar control glass.
A solar control coating has been produced that is only 36% transmissive to solar radiation, yet transmits 71% of the visible spectrum weighted to Illuminant “A”. Computer models predict that this glass can reduce the heat loads on automobile air conditioners up to 22%. Actual tests indicate a 17°F difference in interior temperature after a 1 hour soak as compared to standard glass.
The glass produced is highly reflective to UV and IR radiation from the sun and is tuned to transmit light in the heavily weighted red end of the visible spectrum. This allows the highest solar reflection while maintaining 71% visible transmission. The same film can be tuned to lower transmissions for back and rear sidelights for vans.
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Citation
Young, P. and Bernardi, R., "Auto Solar Control," SAE Technical Paper 880050, 1988, https://doi.org/10.4271/880050.Also In
References
- Kai, Yasuaki Kawasaki, Eiji. “Development of a Laminated Heat-Reflecting Glass” JSAE Review 17 98 100 August 1985
- Shimizu, Shingo et al. “Analysis on Air Conditioning Heat Load of Passenger Vehicle” JSAE Review November 1982
- Atkinson, Ward J. SAE Technical Paper # 860591 “Occupant Comfort Requirements for Automotive Air Conditioning Systems” 1986
- “Moderate Thermal Environments” International Standard 7730 ISO 1984
- Madsen, T.L. et al “New Methods for Evaluation of the Thermal Environment in Automotive Vehicles” ASHRAE Transactions 92 1986
- Roberts, Glenn F. Rose, Axel B. “Detecting Small Differences in Fuel Economy” SAE # 820075 1982
- Montreal Protocol on Substances that Deplete the Ozone Layer United Nations Environment Programme 1987
- “Standard Test Method for Solar Energy Transmittance and Reflectance of Sheet Materials” 1971