Abstract: The object of this invention is to provide a comparatively small freezing device capable of freezing supercooled water instantly at any desired time and place even though the water is at a poorly supercooled state which is resistive to freezing, by actively resolving the supercooled state. The object is achieved by providing a freezing device comprising a cylinder 1 to receive supercooled water, at least one piston 2, 3 to fit liquid-tight to the cylinder to move therein, which, by moving through the cylinder, introduces supercooled water into the cylinder, gives a mechanical impact to the supercooled water enclosed in the cylinder, and expels water in which the supercooled state has been resolved in the presence of impact, out of the cylinder, and a water inlet 1a and outlet 1b to be connected to at least one of the cylinder and piston in such a way as to allow their opening and closing.

Abstract: A geothermal steam turbine plant comprises a steam turbine operatively connected to a production well, an indirect-contact type main condenser into which a geothermal steam including non-condensed gas is introduced from the steam turbine, and a cooling water supply system for supplying cooling water to the main condenser.