Title: Heat transfer system for the utilization of cavities dug in the subsoil as heat silos

Abstract: One or a number of subsoil cavities are employed for the storage or recovery of hot liquids. At the time of heat storage, a heat-transporting liquid is extracted at low temperature at the lower end of each cavity, heated by heat exchange with an external fluid and reinjected at the upper end. At the time of heat recovery, the heat-transporting liquid is extracted at high temperature at the upper end of each cavity, cooled by heat exchange with an external fluid and reinjected at the lower end. The system comprises flow-arresting means for maintaining a minimum operating pressure at the top of each cavity, air or gas purge means, an expansion reservoir and a safety unit for ensuring one-way flow of the heat-transporting liquid from the expansion reservoir to each cavity.

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Inventors: Despois, Jacques (Viroflay, FR)
Nougarede, Francis (La Celle Saint Cloud, FR)

Application Number: 877587
Filing Date: 1978-02-13
Publication_date: 1980-02-26
Assignee: Commissariat a l'Energie Atomique (Paris, FR); Societe Nationale elf Aquitaine (Courbevoie, FR)
Primary Class(es): 165/45 165/104.31, 165/104.32, 165/902
Other Classes:
US Patent Ref:

1959286	May, 1934	Grebe	165/DIG.
2933885	Apr, 1960	Benedek et al.	165/104.
3608624	Sep, 1971	Hasselriis	165/107.
3857244	Dec, 1974	Faucette	165/45.
3974642	Aug, 1976	Pacault	165/104.
4124061	Nov, 1978	Mitchell et al.	165/104.

Other Refs: 2272019

Dec, 1975	FR

Primary Examiner: Richter, Sheldon Jay
Assistant Examiner:
Attorney: Sughrue, Rothwell, Mion, Zinn and Macpeak