Thermal analysis of heat storage canisters for a solar dynamic, space power system
A 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 CaF/sub 2/ 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 behavior in 1/minus/g and microgravity. The thermal anaylsis 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/minus/g, flow due to density gradients. A number of significant differences between 1/minus/g and 0/minus/g behavior were found. These resulted from differences in void location relative to the maximum heat flux and a significantly smaller effective conductance in 0/minus/g due to the absence of gravity-induced convection.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7050127
- Report Number(s):
- ORNL/TM-10665; ON: TI88008960
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
BRAYTON CYCLE POWER SYSTEMS
THERMAL ENERGY STORAGE EQUIPMENT
SOLAR ENERGY
SPACE VEHICLES
THERMAL ANALYSIS
CALCIUM FLUORIDES
CONTAINERS
FINITE DIFFERENCE METHOD
FINITE ELEMENT METHOD
HEAT FLUX
HEAT TRANSFER
HYDRAULICS
LITHIUM FLUORIDES
MATHEMATICAL MODELS
PHASE TRANSFORMATIONS
SPACE VEHICLE COMPONENTS
SPACECRAFT POWER SUPPLIES
THERMAL CONDUCTIVITY
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM HALIDES
ELECTRONIC EQUIPMENT
ENERGY
ENERGY SOURCES
ENERGY SYSTEMS
ENERGY TRANSFER
EQUIPMENT
FLUID MECHANICS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
ITERATIVE METHODS
LITHIUM COMPOUNDS
LITHIUM HALIDES
MECHANICS
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
POWER SUPPLIES
POWER SYSTEMS
RENEWABLE ENERGY SOURCES
THERMODYNAMIC PROPERTIES
VEHICLES
142000* - Solar Energy- Heat Storage- (1980-)
320201 - Energy Conservation
Consumption
& Utilization- Transportation- Air & Aerospace