Patent ID: 7967550

Claim:
A wind turbine comprising two vessels, a condenser, an evaporator, a heating medium, a cooling medium, and a switching structure establishing interchangeable thermal communication between one of the vessels and the heating medium and between the other vessel and the cooling medium, the vessels becoming a pressure increasing vessel by being in thermal communication with a heating medium and becoming a pressure decreasing vessel by being in thermal communication with a cooling medium, wherein each vessel comprises a flow structure providing one way flow of a working fluid between an inlet where the working fluid can enter the vessel and an outlet where the working fluid can escape the vessel, and each vessel forms part of a refrigeration circuit in which the outlet of the pressure increasing vessel is configured to deliver the working fluid to a condenser, the condenser is configured to deliver the working fluid to an evaporator, and the evaporator is configured to deliver the working fluid to the inlet of the pressure decreasing vessel.