Numerical and experimental study of a solid matrix Electric Thermal Storage unit dedicated to environmentally friendly residential heating system

2016 ◽  
Vol 130 ◽  
pp. 747-760 ◽  
Author(s):  
Piotr Cisek ◽  
Dawid Taler
Author(s):  
A. J. Al Edhari ◽  
C. C. Ngo

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.


Energy ◽  
2020 ◽  
Vol 202 ◽  
pp. 117764 ◽  
Author(s):  
C.Q. Chen ◽  
Y.H. Diao ◽  
Y.H. Zhao ◽  
Z.Y. Wang ◽  
L. Liang ◽  
...  

2019 ◽  
Vol 164 ◽  
pp. 106341 ◽  
Author(s):  
Huan Zhang ◽  
Lingfei Jiang ◽  
Wandong Zheng ◽  
Shijun You ◽  
Tingting Jiang ◽  
...  

1982 ◽  
Vol 104 (3) ◽  
pp. 223-228 ◽  
Author(s):  
B. T. Kulakowski ◽  
F. W. Schmidt

A method for the design and sizing of a packed bed thermal storage unit for a hot air solar heating system is presented. A controlled bypass of the heat storage unit during the retrieval process is used in order to maintain the fluid temperature leaving the system at a constant value. The use of a bypass arrangement with a closed air circulation loop for the collector enables the storage unit to operate at a higher mean temperature and the system to utilize the maximum allowable pressure drop. This results in a greater heat storage per unit volume of storage material. The complete solar system is simulated numerically during both the heating and retrieval modes of operation to obtain a set of design charts for sizing the thermal storage unit. In the simulation, consideration is given to geographical location, composition of the storage bed and the maximum allowable pressure drop across the bed. A set of design curves for State College, Pennsylvania, is presented.


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