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Thermal analysis of heat storage canisters for a solar dynamic, space power systemA thermal analysis was performed of a thermal energy storage canister of a type suggested for use in a solar receiver for an orbiting Brayton cycle power system. Energy storage for the eclipse portion of the cycle is provided by the latent heat of a eutectic mixture of LiF and CaF2 contained in the canister. The chief motivation for the study is the prediction of vapor void effects on temperature profiles and the identification of possible differences between ground test data and projected behavior in microgravity. The first phase of this study is based on a two-dimensional, cylindrical coordinates model using an interim procedure for describing void behavor in 1-g and microgravity. The thermal analysis includes the effects of solidification front behavior, conduction in liquid/solid salt and canister materials, void growth and shrinkage, radiant heat transfer across the void, and convection in the melt due to Marangoni-induced flow and, in 1-g, flow due to density gradients. A number of significant differences between 1-g and o-g behavior were found. This resulted from differences in void location relative to the maximum heat flux and a significantly smaller effective conductance in 0-g due to the absence of gravity-induced convection.
Document ID
19890041742
Document Type
Conference Paper
Authors
Wichner, R. P.
(Martin Marietta Energy Systems, Inc. Oak Ridge, TN, United States)
Solomon, A. D.
(Martin Marietta Energy Systems, Inc. Oak Ridge, TN, United States)
Drake, J. B.
(Martin Marietta Energy Systems, Inc. Oak Ridge, TN, United States)
Williams, P. T.
(Martin Marietta Energy Systems, Inc. Oak Ridge, TN, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Spacecraft Propulsion And Power
Meeting Information
Annual ASME Solar Energy Conference(Denver, CO)
Funding Number(s)
CONTRACT_GRANT: NASA ORDER C-30001-J
CONTRACT_GRANT: DE-AC05-84OR-21400
Distribution Limits
Public
Copyright
Other
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