From Spacecraft Thermal Control Handbook, Volume II-Cryogenics
Chapter List
- Chapter 20: Cryogenic Systems Analysis
- Chapter 21: Cryocooler Endurance Testing
This chapter describes the basic concepts, philosophies, and techniques used in modeling and analyzing cryogenic systems for space. Modeling and analysis of cryogenic thermal systems differ significantly from modeling and analysis of ambient thermal systems; however, the processes share many methods, equations, and components. Thus the chapter refers frequently to Volume I of this handbook, [20.1] which discusses many basic analysis concepts in more detail. Because infrared (IR) sensor instruments are the most common space cryogenic application, discussions here concentrate on them. Many of the techniques described, however, are equally applicable to any other cryogenic space system.
Importance and Objectives of Cryogenic System Modeling and Analysis
For any space application, thermal system design and modeling is important to the overall system success. However, the thermal system's importance is amplified significantly for cryogenic systems. Conventional thermal systems (those near room temperature) are often associated with the spacecraft bus, but cryogenic systems are usually integral to the instruments they serve and to the payload, and they are almost always enabling for instrument operation. In addition, an instrument's performance is usually extremely sensitive to the performance of the cryogenic system. Small cryogenic system degradations or inadequacies of fractions of a degree, for instance, can render an IR sensor inoperative.
The importance of the cryogenic system makes cryogenic system thermal modeling and analysis critical to overall program success. Also, just as the cryogenic...
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Chapter List Chapter 22: Thermophysical Properties of Selected Materials Chapter 23: Emittance of Selected Materials at Cryogenic Temperatures M. DonabedianThe Aerospace Corporation, El...
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R. G. Ross Jr.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California. Introduction The fundamental issue of successfully using cryocoolers in a long-life space...
Anant Garg Production of low temperatures or the study of low-temperature phenomena is called cryogenics. Cryogenic systems operate at temperatures lower than -73.3 0C. You can obtain low...
Martin Donabedian The Aerospace Press 2350 E. El Segundo Boulevard El Segundo, California 90245-4691 American Institute of Aeronautics and Astronautics, Inc. 1801 Alexander Bell Drive...
