THEORETICAL EVALUATION OF PACKED BED THERMAL ENERGY STORAGE SYSTEMS
RAEID SAMY ABDEL-AZIM;
Abstract
This thesis presents a mathematical and numerical study of the thermal response of a packed bed for thermal energy storage. The bed, basically, consists of a fluid as a heat carrier and is filled with solid as a storage media.
The governing equations and boundary conditions for both the heat
carrier and solid are derived at transient conditions. The two partial differential equations, representing the energy conservation equations in the heat carrier and solid phases constituting• the packed bed, are coupled through the heat exchange process between the two phases. A finite difference technique is used to solve the two partial differential equations.The equation representing the heat carrier is parabolic in both space and time, and the solid equation is parabolic in time and elliptic in space.
The numerical results are obtained to study the effects of system configuration and operating parameters on the temperature distribution and energy stored in the bed in both the charging and discharging modes. The system configuration parameters consid'ered in this work are the solid particle diameter, bed diameter, bed length, and type of storage medium. Moreover, the opera.ting parameters considered are mass flow rate and inlet fluid temperature. In order
. to investigate the optimum heat carrier, which can be used in the packed bed thermal energy storage, three different heat •carriers are used in the present work, namely, air, thermal oil, and water.
The pressure drop across the packed bed and the effect of different parameters on it are also investigated.
The results show that, increasing bed length, bed diameter, and inlet fluid temperature, result in an increase in the energy stored in the packed bed, whereas, increasing the solid particle diameter for the same bed diameter, results in a decrease in the energy stored. On the other hand, packing the bed with a storage medium with higher thermal capacity results in an increase in the time
The governing equations and boundary conditions for both the heat
carrier and solid are derived at transient conditions. The two partial differential equations, representing the energy conservation equations in the heat carrier and solid phases constituting• the packed bed, are coupled through the heat exchange process between the two phases. A finite difference technique is used to solve the two partial differential equations.The equation representing the heat carrier is parabolic in both space and time, and the solid equation is parabolic in time and elliptic in space.
The numerical results are obtained to study the effects of system configuration and operating parameters on the temperature distribution and energy stored in the bed in both the charging and discharging modes. The system configuration parameters consid'ered in this work are the solid particle diameter, bed diameter, bed length, and type of storage medium. Moreover, the opera.ting parameters considered are mass flow rate and inlet fluid temperature. In order
. to investigate the optimum heat carrier, which can be used in the packed bed thermal energy storage, three different heat •carriers are used in the present work, namely, air, thermal oil, and water.
The pressure drop across the packed bed and the effect of different parameters on it are also investigated.
The results show that, increasing bed length, bed diameter, and inlet fluid temperature, result in an increase in the energy stored in the packed bed, whereas, increasing the solid particle diameter for the same bed diameter, results in a decrease in the energy stored. On the other hand, packing the bed with a storage medium with higher thermal capacity results in an increase in the time
Other data
| Title | THEORETICAL EVALUATION OF PACKED BED THERMAL ENERGY STORAGE SYSTEMS | Other Titles | تقييم نظرى لانظمة تخزين الطاقة الحرارية فى المهد المحشوة | Authors | RAEID SAMY ABDEL-AZIM | Issue Date | 2000 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| B13111.pdf | 2.76 MB | Adobe PDF | View/Open |
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