A device to mount plural number of condenser sections, including respective condenser sections of an inflow conduit flowing into coolant therein, an outflow conduit flowing out of coolant therefrom, a connection tube communicating between the inflow conduit and the outflow conduit, and plural number of condenser tubes for connecting the inflow conduit and the outflow conduit and fins attached to the condenser tube. The plural number of the condenser sections are mounted every inflow conduits and every outflow conduits directing to the same direction, leeward side positioned outflow conduits of the condenser sections and windward side positioned inflow conduits of the condenser sections being connecting the connection tube, with series connection, thereby coolant within the condenser tubes of the plural number of the condenser sections flows in the same direction.