| 摘要 |
PROBLEM TO BE SOLVED: To suppress lowering of heat radiation performance even upon inclination of an ebullient cooler by forming a circulation flow of refrigerant between a refrigerant tank and a radiator. SOLUTION: A vapor tube for supplying refrigerant vapor from a refrigerant tank 3 to a radiator 4 comprises a first vapor tube 11A having one end being coupled with one side face of the refrigerant tank 3, and a second vapor tube 11B having one end being coupled with the other side face of the refrigerant tank 3. A tube for returning condensed liquid from the radiator 4 to the refrigerant tank 3 comprises a first liquid return tube 12A having one end being coupled with one side face of the refrigerant tank 3, and a second liquid return tube 12B having one end being coupled with the other side face of the refrigerant tank 3. Since the second vapor tube 11B is opened above the refrigerant liquid level even if the first vapor tube 11A is opened below the refrigerant liquid level, refrigerant vapor can be fed through the second vapor tube 11B to the radiator 4, liquefied by the radiator 4 and returned back to the refrigerant tank 3 through the liquid return tube 12.
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