| http://www.w3.org/ns/prov#value | - the interior of the casing, said heat exchanger being accommodated in said space and in thermal contact with said folded wall, said heat exchanger including means defining an enclosed passageway for said heat storage medium in which the heat storage medium is separated from the working medium confined in the casing by said inwardly folded wall and by said heat exchanger. 2.
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