Refrigerant evaporator, improved for uniform temperature of air blown out therefrom

A refrigerant evaporator for evaporating refrigerant flowing therein so as to cool outside air flowing therethrough, comprising:

• first evaporation passage means for defining plural first evaporation passages through which the refrigerant flows, said plural first evaporation passages being formed vertically and arranged substantially in parallel with each other in a direction substantially perpendicular to the flowing direction of said outside air;
• a first tank portion connected to each of upper ends and lower ends of said plural first evaporation passages, said first tank portion being extended in a direction crossing said first evaporation passages;
• second evaporation passage means for defining plural second evaporation passages through which the refrigerant flows, said plural second evaporation passages being formed vertically and arranged substantially in parallel with each other in a direction substantially perpendicular to the flowing direction of said outside air, said plural second evaporation passages being disposed adjacent to said first evaporation passages at a downstream side of said first evaporation passages with respect to the flowing direction of said outside air;
• a second tank portion connected to each of upper ends and lower ends of said plural second evaporation passages, and said second tank portion being extended in a direction crossing said second evaporation passages;
• and
• communication means for defining a communication passage for communicating between said plural first evaporation passages and said plural second evaporation passage;
• wherein the refrigerant flows in the same vertical direction at least in portions where said plural first evaporation passages and said plural second evaporation passages overlap with each other with respect to the flowing direction of the outside air, and the flowing direction of the refrigerant in said first tank portion connected to said first evaporation passages and that in said second tank portion connected to said second evaporation passages are opposite to each other.