Patent ID: 7219511

Claim:
An evaporator comprising: heat exchanging parts juxtaposed on both upwind and downwind sides in a flowing direction of wind passing through the evaporator, the heat exchanging parts each including: a plurality of heat exchanging passages each formed to extend vertically and arranged so as to be laminated on each other along a horizontal direction of the evaporator, for performing heat exchange between a coolant flowing inside the heat exchanging passages and air flowing outside the heat exchanging passages; a plurality of tanks communicatively connected to respective upper and lower ends of the heat exchanging passages and each arranged so as to extend horizontally; and a plurality of partitions arranged in the tanks to divide the heat exchanging parts into a plurality of paths so that one of the heat exchanging parts has a meandering number of the heat exchanging passages equal to the meandering number of the heat exchanging passages in the other of the heat exchanging parts, the paths including upwind-side paths arranged on the upwind side in the flowing direction of wind and downwind-side paths arranged on the downwind side so as to each oppose the upwind-side paths respectively, wherein a flowing direction of the coolant flowing in the upwind-side paths is opposite to a flowing direction of the coolant flowing in the downwind-side path opposing to the upwind-side paths, and wherein the number of heat exchanging passages in the paths where the coolant rises is smaller than the number of heat exchanging passages in the paths where the coolant flows downward.