HEAT EXCHANGER

PURPOSE:To prevent refrigerant, overheated once, from being wetted again in a heat exchanger by a method wherein heat transfer fins around at least one of a refrigerant tube at the inlet port or the outlet port of refrigerant are provided with slits or cuts. CONSTITUTION:In this heat exchanger, refrigerant is distributed into two routs after passing through an inlet refrigerant tube 23 and one of it arrives at an outlet refrigerant tube 24 through the refrigerant tubes 27, 26, 21 while the other part of the same arrives at the outlet refrigerant tube 25 through the refrigerant tubes 28, 29. The refrigerant is evaporated gradually during this period while effecting heat exchange between air stream and becomes overheated gas in the outlet refrigerant tubes 24, 25. A differences between the pitches P1, P2 of the refrigerant tubes and the diameter D of the refrigerant tube are less than 12mm respectively and are small, however, there are substantially arced slits 30, 31 and, therefore, heat exchange between refrigerant gas, which flows through the outlet refrigerant tubes 24, 25, and the refrigerant, which flows through the refrigerant tubes 26, 27, 28, 29, by heat transfer through heat transfer fins 22 will never be caused substantially whereby the refrigerant, overheated once, will never be wetted again in the outlet refrigerant tubes 24, 25.