PURPOSE: To cool the inside of a tunnel lower than outside air temperature without raising humidity by installing a sealed cooler inside a tunnel or at the intake of outside air, and installing a refrigerant supply source for supplying a refrigerant to the sealed cooler through a refrigerant transport pipe.
CONSTITUTION: When the temperature of outside air is higher than the allowable temperature of a tunnel, a temperature sensor 13 detects it, and outputs an operation signal to the pump 11 of a cooler 5. Next, the pump 11 pumps up the cooling water 10 inside a cooling water reservoir 8, and supplies it to a water sprinkling head 9. Accordingly, water is sprinkled from a sprinkling head 9 to a heat radiator 6, and the refrigerant in gas phase, which has gone up through a refrigerant transport pipe 7 into a heat radiator 6, is heat-radiated and cooled thereby being returned into the refrigerant in liquid phase, and it is supplied to the sealed cooler 4 through the refrigerant transport pipe 7. As a result, the sealed cooler 4 cools the outside air sent form a blower 3, performing heat exchange. Hereby, the inside of a tunnel can be cooled to the temperature lower than that of outside air without raising the humidity inside the tunnel.
SEGAWA YOSHIHARU
ICHIYANAGI NAOTAKA
