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

열에너지 저장을 위한 지하 암반공동 내 열성층화 거동에 대한 수치해석적 연구

  • Received : 2012.06.04
  • Accepted : 2012.06.18
  • Published : 2012.06.30

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

References

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Cited by

  1. Mechanical Stability Analysis to Determine the Optimum Aspect Ratio of Rock Caverns for Thermal Energy Storage vol.23, pp.2, 2013, https://doi.org/10.7474/TUS.2013.23.2.150
  2. A Comparative Study on Heat Loss in Rock Cavern Type and Above-Ground Type Thermal Energy Storages vol.23, pp.5, 2013, https://doi.org/10.7474/TUS.2013.23.5.442
  3. Thermal Performance Analysis of Multiple Thermal Energy Storage (TES) Caverns with Different Separation Distances Using Computational Fluid Dynamics vol.24, pp.3, 2014, https://doi.org/10.7474/TUS.2014.24.3.201

Acknowledgement

Grant : 지하암반내 열에너지 저장을 위한 핵심기술 개발

Supported by : 한국지질자원연구원