Proceedings ArticleDOI
Analytical and experimental studies of an all specular thermal control louver system in a solar vacuum environment.
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TLDR
In this article, an analytical and experimental program was developed to evaluate the performance of an all specular louver system as a function of sun angle and blade angle, and the application of white paint to the blades resulted in lowering the blade temperatures by 130 C without significantly affecting the system performance.Abstract:
Thermal control louvers are used on the ATS-F&G spacecraft to regulate temperature by varying the effective radiating area. Since solar energy on louvers has a detrimental effect on their ability to radiate energy, an analytical and experimental program was developed to evaluate the performance of an all specular louver system as a function of sun angle and blade angle. Solar simulation tests and analyses show a maximum effective absorptance of .25 for the full open condition. The application of white paint to the blades resulted in lowering the blade temperatures by 130 C without significantly affecting the system performance.read more
Citations
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Sealed-cell nickel-cadmium battery applications manual
W. R. Scott,D. W. Rusta +1 more
TL;DR: In this paper, the design, procurement, testing, and application of aerospace quality, hermetically sealed nickel-cadmium cells and batteries are presented, and long term performance is discussed in terms of the effect of initial design, process and application variables.
Journal ArticleDOI
Analytical Studies on Design Optimization of Movable Louvers for Space Use
TL;DR: In this article, a systematic and generalized analysis of thermal control characteristics of movable louvers with a finite number of blades is presented, based on the assumption that the temperature of each blade is uniform and all blades are infinite in length.
Journal ArticleDOI
Temperature Distribution in Louvered Panels
TL;DR: In this article, a linear relation between the effective emittance and temperature is introduced in the energy equation and the mathematical solution is found to agree numerically with the more conventional techniques employing incremental and iterational methods.
Proceedings ArticleDOI
Louvers for spacecraft temperature control
Robert J. Eby,Robert D. Karam +1 more
References
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Journal ArticleDOI
Analysis of Movable Louvers for Temperature Control
TL;DR: In this paper, an analysis of an infinite louver array led to seven equations; six of them form a simultaneous set (three linear integral equations and three linear algebraic equations) which describe the heat transfer characteristics of the array, and the seventh gives its relative thermal performance in terms of an effective emissivity.
Proceedings ArticleDOI
Analytical determination of the effective emittance of an insulated louver system.
Proceedings ArticleDOI
Thermal tests of an improved louver system for spacecraft thermal control.
O. W. Clausen,J. P. Kirkpatrick +1 more
TL;DR: In this paper, the authors proposed an optimal design for improving thermal performance of existing spacecraft thermally actuated louver system by increasing open-to-closed emittance ratio. But the design was limited to a single spacecraft.