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Passive Dynamically-Variable Thin-film Smart Radiator Device
Technical Paper
2003-01-2472
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper describes a new approach to spacecraft thermal control based on a passive thin-film smart radiator device (SRD) that employs a variable heat-transfer/emitter structure. The SRD employs an integrated thin-film structure based on V1-x-yMxNyOn that can be applied to existing Al thermal radiators. The SRD operates passively in response to changes in the temperature of the space structure. The V1-x-yMxNyOn exhibits a metal/insulator transition with temperature, varying from an IR transmissive insulating state at lower temperatures, to a semiconducting state at higher temperatures. Dopants, M and N, are employed to tailor the thermo-optic characteristics and the transition temperature of the passive SRD. The transition temperature can be preset over a wide range from below -30°C to above 68°C using suitable dopants. A proprietary SRD structure has been developed that facilitates emissivities below 0.2 to dark space at lower temperatures to reduce heater requirements. As the spacecraft temperature increases above the selected transition temperature, the thermal emissivity of the SRD to dark space increases by a factor of 2.5 to 3. The thin-film SRD methodology has significant advantages over competitive technologies in terms of weight, cost, power requirements, mechanical simplicity and reliability Preliminary results on an active electrochromic SRD based on the VO2 system are also presented.
Authors
Citation
Kruzelecky, R., Haddad, E., Jamroz, W., Soltani, M. et al., "Passive Dynamically-Variable Thin-film Smart Radiator Device," SAE Technical Paper 2003-01-2472, 2003, https://doi.org/10.4271/2003-01-2472.Also In
References
- Gilmore D.G. Satellite Thermal Control Handbook The Aerospace Corporation Press El Segundo, California 1994
- Osiander R. et al. “Variable Emissivity through Microelectromechanical System (MEMS) Technology” Research and Development Symposium John Hopkins University, Applied Physics Laboratory November 1999
- Birur G. C. et al. “Micro/nano spacecraft thermal control using a MEMS-based pumped liquid cooling system” SPIE conference on Micromaching and Microfabrication October 21-24 2001 San Francisco, California, USA
- Biter W. Oh S. Hess S. “Electrostatic Switched Radiator for Space Based Thermal Control” Proceedings of the Space Technology and Applications International Forum STAIF Albuquerque, NM 2002
- Mahan Bruce A. University Chemistry 3rd Addison-Wesley Publishing 685 743 1975
- Kruzelecky R.V. et al. “Integrated Thin-Film Smart Coatings with Dynamically-Tunable Thermo-Optical Characteristics” The 32nd International Conference on Environmental System 32-IES, Paper02ICES-170 San Antonio/Texas July 2002
- Shimazaki K. Tachikawa S. Ohnishi A. Nagasaka Y. “Design and Preliminary Test Results of Variable Emittance Device Proceedings of the 8 th International Symposium on Materials in a Space Environment Arachon, France 2000
- Franke E. et al. “Low orbit-protective coating for all-solid-state electrochromic surface heat radiation control device” Surface and Coating Technology 151 152 285 288 2002
- Granquist C.G. et. al. Solar Energy 63 199 216 1998
- Griffiths C.H. Eastwood H.K. J. Appl. Physics 45 2201 2206 1974
- Egorov F.A. et al. “Thin VO 2 films with high optical contrast” Sov. Tech. Phys. Lett. 17 1991 295 296
- Stefanovich G. Pergament A. Stefanovich D. J. Phys. Condens. Matter 12 8837 8845 2000
- Douglas D. et al. “Development of the Variable Emittance Thermal Suite for the Space Technology 5 Microsatellite” Space Technology and Applications International Forum (STAIF)-2002 El-Genk M. American Institute of Physics 204 210
- Shimakawa Y. et al. “A variable-emittance radiator based on a metal-insulator transition of (La,Sr)MnO 3 thin films” Applied Physics Letters 80 2002 4864 4866
- Chudnovskii F.A. F.A. et al. “Electrical Transport Properties and Switching in Vanadium Anode Oxides;“Effect of Laser Irradiation” Phys. Stat. Sol. A 172 391 1999
- Ashcroft N.W. Mermin N.D “Solid State Physics,” Holt, Rinehart and Winston, Saunders College Philadelphia, U.S.A. 20 25 1976