Wind turbine with a refrigeration system and a method of providing cooling of a heat generating component in a nacelle for a wind turbine

1. 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.

2. A wind turbine according to claim 1 , wherein the heating medium is configured to transfer heat from a heat generating structure housed in the wind turbine to the vessel.

3. A wind turbine according to claim 2 , wherein the heat generating structure comprises a gear box, a generator, a transformer, or combinations thereof.

4. A wind turbine according to claim 1 , wherein the heating medium comprises oil.

5. A wind turbine according to claim 1 , wherein the cooling medium is configured to transfer heat from one of the vessels to an ambient space outside the wind turbine.

6. A wind turbine according to claim 5 , wherein the cooling medium comprises water.

7. A wind turbine according to claim 1 , wherein the working fluid comprises water.

8. A wind turbine according to claim 1 , further comprising a throttling valve between the condenser and the evaporator.

9. A wind turbine according to claim 1 , the nacelle comprising a nacelle housing forming an internal environment, the condenser being in thermal communication with an environment being cold relative to the internal environment.

10. A wind turbine according to claim 9 , the cooling medium being circulated in a cooling circuit comprising a heat exchanger in thermal communication with an environment being cold relative to the internal environment.

11. A wind turbine according to claim 1 , wherein the evaporator is arranged in thermal communication with a heat producing component.

12. A wind turbine according to claim 1 , wherein the heat generating structure provides in the range of 100-200 kW at a temperature between 80 and 90 degrees Celsius.

13. A method of cooling a heat producing component in a nacelle of a wind turbine, the method comprising:

providing a refrigerating circuit configured to circulate a working fluid between a compression structure, a condenser and an evaporator,

providing the compression structure with a first vessel and a second vessel each comprising an flow structure for one way flow of the working fluid between an inlet where the working fluid is configured to enter the vessel and an outlet where the working fluid is configured to escape the vessel,;

providing a thermal exchange structure configured to circulate an heating medium between a heat generating structure and the compression structure; and

providing a cooling circuit configured to circulate a cooling medium;

wherein each vessel is brought in thermal communication with the heating medium and the cooling medium by turns.

14. A method according to claim 13 , wherein the cooling circuit is configured to transport heat out of the wind turbine.

15. A method according to claim 13 , wherein the condenser is arranged outside the wind turbine.