<；P>；PROBLEM TO BE SOLVED: To provide a system for boiling washing hot water which is indispensable in a milking machine, using a reduced amount of electricity or petroleum. <；P>；SOLUTION: The quick cooling system for cow's milk is constituted of an ice storage tank 20, a heat-exchanger 14, a heat-pump device 50 to use a nonfreezing liquid that absorbs heat from the ice storage tank 20 through a heat-transmission tube 37 which is inserted into the ice storage tank 20 as a high-temperature side medium and use water as the low-temperature side medium and transmit the heat of the ice storage tank 20 to the water for obtaining hot water, and a hot water storage tank 32 for holding the hot water, obtained by the heat-pump device 50 and provided with a heater 31 for heating the hot water to a prescribed temperature. The freshly extracted warm milk is cooled rapidly to 4°；C, and the heat recovered from the milk is used for boiling water. Since the water is heated to about 60°；C, it can be used as hot water, by only additionally heating to 80°；C, and significant saving of the electricity bill or the petroleum bill can be made. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
