To reduce the size of a heat exchanger, e.g. an evaporator, while ensuring the performance.
On one side of first metal plate 33, first and second shallow recesses 22a and 23a defined by a bottom plate 35 and a pair of sidewalls 36 and 36 projecting from the circumferential edge of the bottom plate 35 in the stacking direction of the first metal plate 33 are provided. At a plurality of points of respective sidewalls 36 and 36, semicircular protrusions 37 and 37 are formed while projecting to the side where the pair of sidewalls 36 and 36 defining respective shallow recesses 22a and 23a face each other. A pair of first metal plates 33 are jointed while being stacked with the recesses 22a and 23a facing each other to produce a first heat exchanger tube element having a channel on the inside. Refrigerant is fed into each channel while varying the flowing direction at each protrusion 37, 37.
SASAKI YOSHIHIRO
ASANUMA TATSU
KOJIMA KAZUHIRO
KOGA YOSHIAKI
