|
Title |
Performance of Thermal Energy Storage in a Graphite Concrete Pebble System
|
|
Authors |
정승태(Seung-Tae Jeong) ; 이기훈(Gi-Hun Lee) ; 양인환(In-Hwan Yang) |
|
DOI |
https://doi.org/10.4334/JKCI.2026.38.4.463 |
|
Keywords |
그라파이트; 콘크리트 페블; 열에너지 저장; 열사이클 graphite; concrete pebbles; thermal energy storage; thermal cycling |
|
Abstract |
In this paper, the thermal characteristics of concrete pebbles containing graphite were quantitatively evaluated to determine the feasibility of using them as thermal energy storage media in a high-temperature sensible heat storage system. Thermal charging and discharging tests were conducted to simulate the operating conditions of a thermal energy storage (TES) system. The mass flow rate of the heat transfer fluid and the rate of temperature increase were considered as test variables, and their influence on heat transfer and the thermal storage performance of the concrete pebbles was examined. As the mass flow rate of the heat transfer fluid increased, heat moved more rapidly through the storage bed, reducing the temperature difference between the sections and improving the temperature uniformity. A higher flow rate also intensified heat exchange between the heat transfer fluid and the concrete pebbles, thereby shortening charging and discharging times. These results show that both short-cycle and long-cycle operation of thermal charging and discharging can be achieved by adjusting the rates of increases and decreases in the temperature of the supplied heat transfer fluid in the storage system.
|