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Smart Windows for Automobiles
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Abstract
Influenced both by styling considerations and by the aerodynamic benefits possible using flush glazing, car designers are making increasing use of glazing on automobiles. This leads to higher throughput of solar radiation into the car. Solar heat load will thus become a greater problem given that fuel efficiency requirements limit increase in the size of vehicle air-conditioners. Driver discomfort will increase due to the absence of shade, and greenhouse effects will become more serious. This leads to opportunities for energy-efficient glazing in vehicles. Smart windows - windows whose luminous and solar transmission vary dynamically to suit changing climatic conditions - have a potential application as energy-efficient automobile glazing. A variety of chromogenic technologies have been proposed. These include liquid crystal (LC) technology such as encapsulated LC devices consisting of small liquid crystal droplets encapsulated in a polymer matrix. Electrochromic (EC) technology - where transmittance changes under applied electric field or current - is also proposed for energy efficient glazing. A variety of designs are possible including laminate constructions formed from two glass substrates that sandwich an electrochromically active medium, and all solid-state devices fabricated by deposition of electrochromic thin films onto a single glass substrate. This paper reviews how publicly announced chromogenic technologies match automotive window needs and applications. Construction and performance of smart window designs currently under development are described. World-wide activity in this area is reviewed. Various chromogenic and nonchromogenic technologies are compared in terms of how they meet the performance, safety, and environmental resilience required of automotive glazing.
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Citation
Lynam, N., "Smart Windows for Automobiles," SAE Technical Paper 900419, 1990, https://doi.org/10.4271/900419.Also In
References
- “Safety Code for Safety Glazing for Glazing Motor Vehicles Operating on Land Highways” 1988 American National Standards Institute New York
- “Glazing Materials” Federal Motor Vehicle Safety Standard 205 National Highway Traffic Safety Administration Washington
- “Uniform Provisions Concerning the Approval of Safety Glazing and Glazing Materials” Inland Transport Committee, European Economic Community
- “Safety Glasses for Road Vehicles” Japanese Industrial Standard JIS R-3211 1985
- “Test Methods of Safety Glasses for Road Vehicles” Japanese Industrial Standard JIS R-3212 1985
- Doolittle, E.P. Horton, T.B. Blom, H.P. “Antilacerative Windshield Materials; Field Evaluation by General Motors” Society of Automotive Engineers, International Congress and Exposition February 1984 Paper 840391
- Nikodem, R.B. et al. “Method for Producing an Electrically Heated Window Assembly and Resulting Article” 1988
- Bitter, L.E. “Process for Making a Curved, Conductively Coated Glass Member and the Product Thereof” 1987
- Glaser, H.J. “Improved Insulating Glass with Low Emissivity Coatings Based on Gold, Silver, or Copper Films Embedded in Interference Layers” Glass Technology 21 3 254 1980
- Frank, G. Kauer, E. Kostlin, H. Schmitt, F.J. “Transparent Heat Reflecting Coatings (THRC) Based on Highly Doped Tin Oxide and lndium Oxide” Proc. SPIE 324 58 1982
- “Side Impact: Injury Causation and Occupant Protection” Society of Automotive Engineers, International Congress and Exposition February 1989
- Colombin, L. Lourdaine, L. “Innovation is the Future of Glass in the Automobile” Glass Digest 67 6 54 1988
- Zurer, P. “Producers, Users Grapple with Realities of CFC Phaseout” Chemical & Engineering News 67 20 7 July 24 1989
- Moon, P. “Proposed Standard Solar Radiation Curves for Engineering Use” J. Franklin Inst. 230 583 1940
- Goodman, R.D. “Solar Control Glass for Increasing Passenger Comfort in Automobiles” Society of Automotive Engineers, Paper 890217 1989
- Doremus, R.H. Glass Science 328 Wiley NY 1973
- Hoya Corporation “Glass for Absorption of Near-Infrared” 1985
- Szczyrbowski, J. Dietrich, A. Hartig, K. “Bendable Silver Based Low Emissivity Coating on Glass” Proc. SPIE 823 21 1987
- Karlsson, B. “Optical Classification of Transparent Heat Mirrors” Proc. SPIE 653 148 1986
- Soule, D.E. Wood, S.E. “Heat Mirror Profile Optimization for TSC Hybrid Solar Conversion” Proc. SPIE 653 172 1987
- Young, P. Van Esso, R.A. “A Solar Control Glass for Automobiles” Society Automotive Engineers, Paper 890311 1989
- Bishay, A. “Colors and Magnetic Properties of Iron in Glasses of Various Types and Their Implications Concerning Structure: 1, High Alkali Silicate Glasses” J. Am. Cer. Soc. 42 9 403 1959
- Memarzadeh, K. Woollam, J.A. Belkind, A. “Ellipsometric Study of ZnO/Ag/ZnO Optical Coatings: Determination of Layer Thickness and Optical Constants” Proc. SPIE 823 54 1987
- Popular Science October 1989
- Shimizu, S. Hara, S. Asakawa, F. “Analysis of Air-conditioning Heat Load of Passenger Vehicle” JSAE Review 80 November 1982
- Ruth, D.W. “Simulation Modeling of Automobile Comfort Cooling Requirements” ASHRAE Journal May 1975
- Chiou, J.P. “Application of Solar-Powered Ventilator in Automobiles” Society of Automotive Engineers, Paper 860585 1986
- Sullivan, R. Selkowitz, S. “Effects of Glazing and Ventilation Option on Automobile Air-conditioner Size and Performance” Lawrence Berkeley Lab Report #LBL-26552 and Department of Defense Contract #DE-AC03-76SF00098 1988
- Lampert, C.M. “Electrochromic Materials and Devices for Energy Efficient Windows” Solar Energy Materials 11 1 1984
- Lynam, N.R. “Electrochromic Automotive Day/Night Mirrors” Society of Automotive Engineers, Paper 870636 1987
- Kamimori, T. Nagai, J. Mizuhashi, M. “Electrochromic Devices for Transmissive and Reflective Light Control” Proc. SPIE 653 2 1986
- Kase, T. Kawai, M. Miko, U. “A New Electrochromic Device for Automotive Glass - The Development of Adjustable Transparency Glass” Society of Automotive Engineers, Paper 861362 1986
- Arribart, H. et al “Glass With Variable Transmission of the Electrochrome Type” 1987
- Greenberg, C.B. Singleton, D.E. “Electrochromic Window with Metal Grid Counter Electrode” 1988
- Konynenburg, P.V. Marsland, S. McCoy, J. “Solar Radiation Control Using NCAP Liquid Crystal Technology” Proc. SPIE 823 143 1987
- Konynenburg, P.V. Gajewski, K. J. “Electrically Controlled Light Transmission Glazing for Automotive Applications Based on NCAP Technology” Society of Automotive Engineering, International Congress and Exposition Detroit, MI Feb 27 March 3 1989
- Doane, J.W. Vaz, N.A. Wu, B.G. Zumer, S. “Field Controlled Light Scattering from Nematic Droplets” App. Phys, Letters 48 4 269 1986
- West, J.L. “Phase Separation of Liquid Crystals in Polymers” Mol. Cryst. Liq. Cryst. 157 427 1988
- Doane, J.W. Golemme, A. West, J.L. Whitehead, J.B., Jr. Wu, B.G. “Polymer Dispersed Liquid Crystals for Display Application” Mol. Cryst. Liq. Cryst. 1988
- “Taliq Looking to Use Switching Film in AG” Glass Magazine 39 October 1988
- “Turning Research into Reality” Plastics News 1 March 1989
- Bitter, L.E. Lundgren, B.L. “Crack Detector for Electrically Conductive Windshield” 1986
- Fanger, P.O. Thermal Comfort Danish Technical Press Copenhagen 1970