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Title: Flight experiment of thermal energy storage

Abstract

Brayton and Stirling power systems under current considerations for missions in the near future require working fluid temperatures in the 1100 to 1300+ K range. TES materials that meet these requirements fall into the fluoride family of salts. These salts store energy as a heat of fusion, thereby transferring heat to the fluid at constant temperature during shade. The principal feature of fluorides that must be taken into account is the change in volume that occurs with melting and freezing. Salts shrink as they solidify, a change reaching 30 percent for some salts. The location of voids that form as result of the shrinkage is critical when the solar dynamic system reemerges into the sun. Hot spots can develop in the TES container or the container can become distorted if the melting salt cannot expand elsewhere. Analysis of the transient, two-phase phenomenon is being incorporated into a three-dimensional computer code. The code is capable of analysis under microgravity as well as 1 g. The objective of the flight program is to verify the predictions of the code, particularly of the void location and its effect on containment temperature. The four experimental packages comprising the program will be the first testsmore » of melting and freezing conducted under microgravity. Each test package will be installed in a Getaway Special container to be carried by the shuttle. The package will be self-contained and independent of shuttle operations other than the initial opening of the container lid and the final closing of the lid. Upon the return of the test package from flight, the TES container will be radiographed and finally partitioned to examine the exact location and shape of the void. Visual inspection of the void and the temperature data during flight will constitute the bases for code verification.*** ABSTRACT OVERFLOW --« less

Authors:
Publication Date:
Research Org.:
National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
OSTI Identifier:
5657654
Report Number(s):
N-89-24440; NASA-TM-102081; E-4843; NAS-1.15:102081; CONF-890815-
Resource Type:
Conference
Resource Relation:
Conference: 24. intersociety energy conversion engineering conference, Arlington, VA (USA), 6-11 Aug 1989
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 25 ENERGY STORAGE; HEAT SINKS; COMPUTERIZED SIMULATION; VOIDS; HEAT STORAGE; FLUORIDES; SOLAR THERMAL POWER PLANTS; WORKING FLUIDS; FIELD TESTS; FREEZING; MELTING; SHRINKAGE; THERMODYNAMIC CYCLES; ENERGY STORAGE; FLUIDS; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; PHASE TRANSFORMATIONS; POWER PLANTS; SIMULATION; SINKS; SOLAR POWER PLANTS; STORAGE; TESTING; THERMAL POWER PLANTS; 140702* - Solar Thermal Power Systems- Central Receiver; 250600 - Energy Storage- Thermal

Citation Formats

Namkoong, D. Flight experiment of thermal energy storage. United States: N. p., 1989. Web.
Namkoong, D. Flight experiment of thermal energy storage. United States.
Namkoong, D. 1989. "Flight experiment of thermal energy storage". United States.
@article{osti_5657654,
title = {Flight experiment of thermal energy storage},
author = {Namkoong, D},
abstractNote = {Brayton and Stirling power systems under current considerations for missions in the near future require working fluid temperatures in the 1100 to 1300+ K range. TES materials that meet these requirements fall into the fluoride family of salts. These salts store energy as a heat of fusion, thereby transferring heat to the fluid at constant temperature during shade. The principal feature of fluorides that must be taken into account is the change in volume that occurs with melting and freezing. Salts shrink as they solidify, a change reaching 30 percent for some salts. The location of voids that form as result of the shrinkage is critical when the solar dynamic system reemerges into the sun. Hot spots can develop in the TES container or the container can become distorted if the melting salt cannot expand elsewhere. Analysis of the transient, two-phase phenomenon is being incorporated into a three-dimensional computer code. The code is capable of analysis under microgravity as well as 1 g. The objective of the flight program is to verify the predictions of the code, particularly of the void location and its effect on containment temperature. The four experimental packages comprising the program will be the first tests of melting and freezing conducted under microgravity. Each test package will be installed in a Getaway Special container to be carried by the shuttle. The package will be self-contained and independent of shuttle operations other than the initial opening of the container lid and the final closing of the lid. Upon the return of the test package from flight, the TES container will be radiographed and finally partitioned to examine the exact location and shape of the void. Visual inspection of the void and the temperature data during flight will constitute the bases for code verification.*** ABSTRACT OVERFLOW --},
doi = {},
url = {https://www.osti.gov/biblio/5657654}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1989},
month = {Sun Jan 01 00:00:00 EST 1989}
}

Conference:
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