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http://dx.doi.org/10.7474/TUS.2012.22.3.188

Numerical Study on the Thermal Stratification Behavior in Underground Rock Cavern for Thermal Energy Storage (TES)  

Park, Do-Hyun (KIGAM)
Kim, Hyung-Mok (KIGAM)
Ryu, Dong-Woo (KIGAM)
Choi, Byung-Hee (KIGAM)
SunWoo, Choon (KIGAM)
Han, Kong-Chang (KIGAM)
Publication Information
Tunnel and Underground Space / v.22, no.3, 2012 , pp. 188-195 More about this Journal
Abstract
Using a computational fluid dynamics (CFD) code, FLUENT, the present study investigated the thermal stratification behavior of Lyckebo storage in Sweden, which is the very first large-scale rock cavern for underground thermal energy storage. Heat transfer analysis was carried out for numerical cases with different temperatures of the surrounding rock mass in order to examine the effect of rock mass heating due to periodic storage and production of thermal energy on thermal stratification and heat loss. The change of thermal stratification with respect to time was quantitatively examined based on an index of the degree of stratification. The results of numerical simulation showed that in the early operational stage where the surrounding rock mass was less heated, the stratification of stored thermal energy was rapidly degraded over time, but the degradation and heat loss tended to reduce as the surrounding rock mass was heated during a long period of operation.
Keywords
Cavern thermal energy storage; Thermal stratification; Degree of thermal stratification; Computational fluid dynamics;
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Times Cited By KSCI : 1  (Citation Analysis)
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