To restrain a carry-over phenomenon of droplets of a liquid refrigerant from an upper cover, in a downward flow liquid film type evaporator for evaporating the liquid refrigerant by a heat transfer pipe group by flowing the liquid refrigerant out of refrigerants under two gas-liquid phase states supplied in a tank through a refrigerant inlet pipe to the heat transfer pipe group by a liquid refrigerant spraying device having an upper cover and a refrigerant tub and provided between the heat transfer pipe group in the tank and a steam outlet pipe at an upper part of the tank in an upward and downward direction.
In a downward flow liquid film type evaporator (1), a large number of upper cover ventilation holes (40) are formed on an upper cover (36), so that an opening ratio at a portion of the upper cover (36) near a steam outlet pipe (18) is made smaller than an opening ratio of the upper cover (36) away from the steam outlet pipe (18).
KIN GENEI
YO KUNITADA
FUKUOKA MOTOHIKO
OGATA JUNJI
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