Sweden and Finland have both investigated underground thermal energy storage for nearly two decades, and have similar bedrock - the Fenno-Scandian granitic rocks. This article is a review of work performed in the field of combined rock cavern and borehole heat stores, concerned with construction technology, costs and design principles. One example is an asymmetric store, in the form of 40-60 m long horizontal boreholes between two rock caverns, with the caverns themselves comprising only about 10% of the total storage volume. This design has a specific cost of 0.40 MUSD/GWh and 0.24 MUSD/GWh for storage capacities of 6 GWh and 36 GWh respectively. Half of the total construction cost relates to the rock cavern part of the store.
|Title of host publication||Thermal energy storage|
|Subtitle of host publication||Better economy, environment, technology|
|Editors||Markku Kangas, P.D. Lund|
|Place of Publication||Espoo|
|Publisher||Helsinki University of Technology|
|Publication status||Published - 1994|
|MoE publication type||A4 Article in a conference publication|
|Event||6th International Conference on Thermal Energy Storage, Calorstock '94 - Espoo, Finland|
Duration: 22 Aug 1994 → 25 Aug 1994
|Conference||6th International Conference on Thermal Energy Storage, Calorstock '94|
|Period||22/08/94 → 25/08/94|
Nordell, B., Ritola, J., Sipilä, K., & Sellberg, B. (1994). The combined rock cavern/borehole heat store. In M. Kangas, & P. D. Lund (Eds.), Thermal energy storage: Better economy, environment, technology (Vol. 1, pp. 389-396). Helsinki University of Technology.