Patent ID: 7004239

Claim:
A cooling apparatus boiling and condensing refrigerant to cool a high-temperature medium, said cooling apparatus comprising: a refrigerant tank for containing liquid refrigerant to be vaporized by heat transferred from said high-temperature medium; and a radiator communicating with said refrigerant tank to condense the gaseous refrigerant vaporized in said refrigerant tank into the liquid refrigerant; wherein, said radiator includes; an inflow communicating portion into which the refrigerant flows; an outflow communicating portion from which the refrigerant flows out; a refrigerant passage connecting said inflow communicating portion with said outflow communicating portion; a condensing fin disposed in said refrigerant passage to condense the gaseous refrigerant into the condensed liquid refrigerant, the condensing fin being a corrugated fin having a plurality of walls which divide the refrigerant passage into a plurality of channels inclined at an acute angle from a horizontal direction connecting said inflow communicating portion with said outflow communicating portion, said plurality of channels being vertically adjacent each other within said refrigerant passage, each of said plurality of walls of said corrugated fin being provided with a plurality of slits through with the condensed liquid refrigerant drops towards the lowest of said plurality of channels.