Heat and Mass Transfer in Unsaturated Porous Media with Application to Thermal Energy Storage

1988 ◽  
pp. 57-73
Author(s):  
J. Bear ◽  
A. Nir ◽  
J. Bensabat
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Energy Storage ◽  
Heat And Mass Transfer ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Unsaturated Porous Media

Convective Heat Transfer in Porous Media

1979 ◽  
Vol 101 (3) ◽  
pp. 507-510 ◽  
Author(s):  
Ali Montakhab
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Energy Storage ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage Systems ◽  
Energy Storage Systems ◽  
Thermal Energy Storage Systems

Convective heating or cooling of granular solids or porous media is of interest in the design of thermal energy storage systems. The solutions to the energy initial boundary value problems governing convective heat transfer between a fixed bed of granular solids and a steady flow of heating or cooling fluid are presented. The storage system is considered to be initially in thermal equilibrium at a uniform temperature, a step change in the inlet temperature of the working fluid is imposed, and the thermal response of the system predicted. The results are valid for gases and liquids when the temperature gradient in the solid material is small and axial conduction effect is negligible in comparison with the convective heat transfer. Unlike the previously available solutions to this problem, the results presented are in closed form. This greatly simplifies evaluation and design of thermal energy storage systems of this general type.

Geochemical reactions associated with low-temperature thermal energy storage in aquifers

1984 ◽  
Vol 21 (3) ◽  
pp. 475-488 ◽  
Author(s):  
Carl D. Palmer ◽  
John A. Cherry
Keyword(s):  
Mass Transfer ◽  
Energy Storage ◽  
Low Temperature ◽  
Chemical Reactions ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Injection Well ◽  
Transfer Model ◽  
Injection Water ◽  
The Given

The geochemical mass transfer model WATEGM-SE is used to illustrate by example potential chemical reactions that can occur at a hypothetical low-temperature thermal energy aquifer storage facility. Important processes that control the chemistry include heating and cooling of the water, equilibration of the pumped water with the atmospheric partial pressure of CO2 and O2, and the mixing of the injection water with the native groundwater during the injection, storage, and recovery cycles. For the given example, 0.3 mmol/L of calcite would be precipitated under closed system pumping and heating from 10 to 50 °C while a total of 1.9 mmol/L would be precipitated under the open condition. If this calcite were to form scale within the facility's piping then considerable lengths can be affected depending on the pumping rate. Alternatively, if the precipitate is kept in suspension it will be transported to the injection well and will be filtered out by the aquifer itself. This filtration can result in significant decreases in porosity and hence permeability in the immediate vicinity of the injection well. Mixing of the injection water with the native groundwater changes the water chemistry and can result in mineral supersaturation or undersaturation depending on the composition of these waters and the proportions in which they are mixed. The effect of mixing on the given example is undersaturation with respect to calcite and supersaturation with respect to amorphous Fe(OH)3. The pe values in the simulations of mixtures of an oxidizing injection water and a reducing native groundwater yielded some results with significantly higher pe values than the oxidizing injection water. The use of equilibrium geochemical mass transfer models tempered by an understanding of their limitations may prove to be an effective tool for evaluation of potential chemical reactions associated with low-temperature aquifer thermal energy storage facilities. Key words: thermal energy storage, geochemical equilibria, groundwater, simulation, scale formation, mixing.

Experimental Study of Thermal Energy Storage Using Natural Porous Media

2017 ◽  
Author(s):  
A. J. Al Edhari ◽  
C. C. Ngo
Keyword(s):  
Experimental Study ◽  
Porous Media ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage System ◽  
Thermal Storage ◽  
Heat Transfer Fluid ◽  
Storage Unit ◽  
Storage Media

Thermal energy storage has been an area of research interest due to the need to store solar energy or excess energy for later use in many applications including district heating. The focus of a lot of research is on exotic and expensive storage media. This paper presents an experimental study of thermal energy storage using porous media readily available and commonly found in nature such as sand, soil, pebble rocks and gravel. This study also considers a simple and inexpensive thermal storage system which could be constructed easily and examines what could be done to increase the thermal storage performance. The thermal storage system examined in the present study was a thermal energy storage unit with embedded horizontal pipes carrying water as the heat transfer fluid for thermal charging. Different thermal storage configurations were examined by adjusting the thermal charging temperature and using different storage media. The temperature distribution within the storage media was monitored for 10 hours using a data acquisition system with K-type thermocouples. The results indicate that a thermal storage system using sand as storage media is slightly better compared with gravel or pebble rocks as storage media.

Heat and mass transfer in unsaturated porous media with solid-liquid change

2001 ◽  
Vol 37 (2-3) ◽  
pp. 237-242 ◽  
Author(s):  
T.-J. Lu ◽  
J.-H. Du ◽  
S.-Y. Lei ◽  
B.-X. Wang
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Heat And Mass Transfer ◽  
Unsaturated Porous Media ◽  
Solid Liquid

scholarly journals Effect of porous media on the heat transfer enhancement for a thermal energy storage unit

2018 ◽  
Vol 152 ◽  
pp. 984-989 ◽  
Author(s):  
Jiabang Yu ◽  
Ying Yang ◽  
Xiaohu Yang ◽  
Qiongxiang Kong ◽  
Liu Yanhua ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Energy Storage ◽  
Heat Transfer Enhancement ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Transfer Enhancement ◽  
Storage Unit ◽  
Energy Storage Unit
Sign in / Sign up

Export Citation Format

Share Document