Transient response of a packed bed for both sensible and latent thermal energy storage
Thesis/Dissertation
·
OSTI ID:6957564
The present work was undertaken to provide a model which accurately predicts the performance of a packed bed energy storage system utilizing spherically encapsulated phase-change material (PCM). Two models were developed which are referred to as the first-order and second-order models. Both models involve modelling of the phase-change material as a conduction problem with both sensible and latent energy storage and include consideration of the temperature gradients in both phases. Both models include the solution of the energy equation for the fluid passing through the packed bed. In the second-order model, both the intra-particle conduction and the dispersion effects in the energy transport fluid are considered, whereas in the first-order model only the intra-particle condition effects are considered. Numerical results obtained with both models have been compared with previous experimental data. Both analytical models accommodate subcooling and superheating for PCM melting and freezing situations, respectively, as well as supercooling of the PCM in the computer simulation. The significance of subcooling or superheating depends upon the magnitude of the subcooling or superheating. Previously reported analyses in the literature do not include the effect of subcooling or superheating. Both the first-order and second-order models of the present study can be used to predict the melting/freezing time, the melting/freezing front location in the packed bed, and the temperature history of both the transporting fluid and the PCM in the bed.
- Research Organization:
- Tennessee Univ., Knoxville (USA)
- OSTI ID:
- 6957564
- Country of Publication:
- United States
- Language:
- English
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