The combi heat store: A combined rock cavern/borehold heat store

Bo Nordell, Jouko Ritola, Kari Sipilä, Björn Sellberg

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Since 1988, Sweden and Finland have collaborated bilaterally on thermal energy storage with respect to information exchange and collaborative R&D projects. The two countries have both investigated underground thermal energy storage for nearly two decades, and have similar bedrock—the Fenno-Scandian granitic rocks. This paper reviews the 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- to 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 $US0.40 million/ GWh and $US0.24 million/ 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.
Original languageEnglish
Pages (from-to)243-249
Number of pages7
JournalTunnelling and Underground Space Technology
Volume9
Issue number2
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

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cavern
Rocks
Thermal energy
Boreholes
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Energy storage
borehole
cost
Costs
Hot Temperature
energy storage

Cite this

Nordell, Bo ; Ritola, Jouko ; Sipilä, Kari ; Sellberg, Björn. / The combi heat store : A combined rock cavern/borehold heat store. In: Tunnelling and Underground Space Technology. 1994 ; Vol. 9, No. 2. pp. 243-249.
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abstract = "Since 1988, Sweden and Finland have collaborated bilaterally on thermal energy storage with respect to information exchange and collaborative R&D projects. The two countries have both investigated underground thermal energy storage for nearly two decades, and have similar bedrock—the Fenno-Scandian granitic rocks. This paper reviews the 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- to 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 $US0.40 million/ GWh and $US0.24 million/ 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.",
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The combi heat store : A combined rock cavern/borehold heat store. / Nordell, Bo; Ritola, Jouko; Sipilä, Kari; Sellberg, Björn.

In: Tunnelling and Underground Space Technology, Vol. 9, No. 2, 1994, p. 243-249.

Research output: Contribution to journalArticleScientificpeer-review

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