Heat and mass transfer in unsaturated porous media. Final report
A preliminary study of heat and water transport in unsaturated porous media is reported. The project provides background information regarding the feasibility of seasonal thermal energy storage in unconfined aquifers. A parametric analysis of the factors of importance, and an annotated bibliography of research findings pertinent to unconfined aquifer thermal energy storage (ATES) are presented. This analysis shows that heat and mass transfer of water vapor assume dominant importance in unsaturated porous media at elevated temperature. Although water vapor fluxes are seldom as large as saturated medium liquid water fluxes, they are important under unsaturated conditions. The major heat transport mechanism for unsaturated porous media at temperatures from 50 to 90/sup 0/C is latent heat flux. The mechanism is nonexistent under saturated conditions but may well control design of unconfined aquifer storage systems. The parametric analysis treats detailed physical phenomena which occur in the flow systems study and demonstrates the temperature and moisture dependence of the transport coefficients of importance. The question of design of an unconfined ATES site is also addressed by considering the effects of aquifer temperature, depth to water table, porous medium flow properties, and surface boundary conditions. Recommendations are made for continuation of this project in its second phase. Both scientific and engineering goals are considered and alternatives are presented.
- Research Organization:
- Oregon State Univ., Corvallis, OR (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5561348
- Report Number(s):
- PNL-4036; ON: DE82008519
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
58 GEOSCIENCES
AQUIFERS
SENSIBLE HEAT STORAGE
POROUS MATERIALS
HEAT TRANSFER
MASS TRANSFER
ROCKS
SEDIMENTS
SOILS
FLUID FLOW
GEOLOGY
MOISTURE
TEMPERATURE DEPENDENCE
VAPORS
ENERGY STORAGE
ENERGY TRANSFER
FLUIDS
GASES
HEAT STORAGE
MATERIALS
STORAGE
250600* - Energy Storage- Thermal
420400 - Engineering- Heat Transfer & Fluid Flow
580100 - Geology & Hydrology- (-1989)