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Impact of thermal energy storage properties on solar dynamic space power conversion system massA 16 parameter solar concentrator/heat receiver mass model is used in conjunction with Stirling and Brayton Power Conversion System (PCS) performance and mass computer codes to determine the effect of thermal energy storage (TES) material property changes on overall PCS mass as a function of steady state electrical power output. Included in the PCS mass model are component masses as a function of thermal power for: concentrator, heat receiver, heat exchangers (source unless integral with heat receiver, heat sink, regenerator), heat engine units with optional parallel redundancy, power conditioning and control (PC and C), PC and C radiator, main radiator, and structure. Critical TES properties are: melting temperature, heat of fusion, density of the liquid phase, and the ratio of solid-to-liquid density. Preliminary results indicate that even though overall system efficiency increases with TES melting temperature up to 1400 K for concentrator surface accuracies of 1 mrad or better, reductions in the overall system mass beyond that achievable with lithium fluoride (LiF) can be accomplished only if the heat of fusion is at least 800 kJ/kg and the liquid density is comparable to that of LiF (1800 kg/cu m).
Document ID
19880024578
Document Type
Conference Paper
Authors
Juhasz, Albert J. (NASA Lewis Research Center Cleveland, OH, United States)
Coles-Hamilton, Carolyn E. (NASA Lewis Research Center Cleveland, OH, United States)
Lacy, Dovie E. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
SPACECRAFT PROPULSION AND POWER
Meeting Information
IECEC ''87(Philadelphia, PA)
Distribution Limits
Public
Copyright
Other