PURPOSE: To improve heat transfer performance by a method wherein refrigerant flow passage is formed so as to be slanted to obtain an upward slope toward a high quality area as a whole or at least locally from the inlet port of refrigerant.
CONSTITUTION: An evaporator 1 is formed so that heat transfer tubes in the same are slanted so as to obtain the upward slope of an angle θ toward the outlet port 7 of refrigerant or a high quality area. In this case, the part of the initial path including the inlet port 6 of the refrigerant is formed so that the heat transfer tubes are formed so as to obtain an upward slope θ toward the high quality area. The initial path or a low quality and low flow speed area is formed so as to have an upward slope whereby the separation of flow, easily generated in the low flow speed area, can be prevented and heat transfer performance can be improved.
YABUMOTO OSAMU
SONOI HIDEKAZU
MITSUDA MASAHIKO
