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Heat Load Sharing in a Capillary Pumped Loop With Multiple Evaporators and Multiple Condensers
Technical Paper
2005-01-2881
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper describes the heat load sharing function among multiple parallel evaporators in a capillary pumped loop (CPL). In the normal mode of operation, the evaporators cool the instruments by absorbing the waste heat. When an instrument is turned off, the attached evaporator can keep it warm by receiving heat from other evaporators serving the operating instruments. This is referred to as heat load sharing. A theoretical basis of heat load sharing is given first. The fact that the wicks in the powered evaporators will develop capillary pressure to force the generated vapor to flow to cold locations where the pressure is lower leads to the conclusion that heat load sharing is an inherent function of a CPL with multiple evaporators. Heat load sharing has been verified with many CPLs in ground tests. Experimental results of the Capillary Pumped Loop 3 (CAPL 3) Flight Experiment are presented in this paper. Factors that affect the amount of heat being shared are discussed. Some limitations of heat load sharing are also addressed.
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Citation
Ku, J., "Heat Load Sharing in a Capillary Pumped Loop With Multiple Evaporators and Multiple Condensers," SAE Technical Paper 2005-01-2881, 2005, https://doi.org/10.4271/2005-01-2881.Also In
References
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- Chalmers, D. Fredley, J. Kurtz, M. “A New Era of Instrument Thermal Management with Capillary Heat Transport Systems,” 51 st International Astronautical Congress October 2–6 2000 Rio do Janeiro Brazil
- Ku, J. Ottenstein, L. Butler, D. Swanson, T. Thies, D. “Thermal Performance of Capillary Pumped Loops Onboard Terra Spacecraft,” SAE Paper No. 2004-01-2504 2004
- McIntosh, R. Kaylor, M. Buchko, M. Kroliczek, E. Smith, R. “A Capillary Pump Loop Cooling System for the NICMOS Instrument,” SAE Paper No. 981814 1998
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- Ku, J. Ottenstein, L. Butler, D. “Performance of the CAPL Flight Experiment,” SAE Paper No. 961432 1996