A numerical and experimental study of stratified thermal storage
A one-dimensional, implicit, finite-difference model of a single stratified thermal storage tank has been developed. The model covers variable flow rates for charging or discharging the thermal storage tank and conduction and turbulent mixing within the water for two different inlet configurations. In order to handle variable flow rates, a ''conceptual buffer tank'' algorithm was developed. Turbulent mixing occurring in the tank was simulated through thermal eddy conductivity factors, which were determined from experimental data. A decreasing hyperbolic function predicted the best variation of the eddy conductivity factor inside the tank. A general relationship between the inlet eddy conductivity factor and the ratio of Reynolds number over Richardson number was established for the inlets investigated. The simulation model adequately predicted the experimental data. In addition, the model reproduced hydraulic test data better than a recent one-dimensional model found in the literature.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (US)
- OSTI ID:
- 6960792
- Report Number(s):
- CONF-8606125-
- Journal Information:
- ASHRAE Trans.; (United States), Vol. 92:2A; Conference: ASHRAE annual meeting, Portland, OR, USA, 22 Jun 1986; Other Information: Technical Paper 2995
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
THERMAL ENERGY STORAGE EQUIPMENT
TEMPERATURE DISTRIBUTION
COMPUTER CODES
COMPUTERIZED SIMULATION
FINITE DIFFERENCE METHOD
HEAT STORAGE
HEAT TRANSFER FLUIDS
HYDRAULICS
REYNOLDS NUMBER
STRATIFICATION
TANKS
THERMAL CONDUCTIVITY
THERMODYNAMICS
WATER
CONTAINERS
ENERGY STORAGE
EQUIPMENT
FLUID MECHANICS
FLUIDS
HYDROGEN COMPOUNDS
ITERATIVE METHODS
MECHANICS
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIMULATION
STORAGE
THERMODYNAMIC PROPERTIES
250600* - Energy Storage- Thermal
990220 - Computers
Computerized Models
& Computer Programs- (1987-1989)