SEAWATER COOLING DEVICE BY USE OF STEAM EJECTOR THAT DOES NOT NEED REFRIGERANT

PURPOSE: A seawater cooling device is provided to realize a seawater cooling device of a simple structure that does not need refrigerant with low upfront investment by using a steam ejector. CONSTITUTION: The seawater cooling device, which cools and supply the seawater to a nursery tank(50), includes a closed tank(10), a low-pressure maintaining unit(30), a condensation tank(20), and a supply unit(12). The closed tank(10) has a built-in ejecting unit(16) for ejecting the supplied seawater. The low-pressure maintaining unit maintains the pressure of the closed tank below the evaporation pressure. The condensation tank(20) connected to the closed tank has a built-in condenser(24) for condensing the steam evaporated from the seawater that is jetted out from the inside of the closed tank. The supply unit supplies the cooled water within the closed tank to the nursery tank. A part of the seawater evaporating within the closed tank refrigerates the inside of the closed tank.