Heat exchanger

A heat exchanger comprising:

• a main body including an outer shell having a substantially rectangular parallelepiped shape elongated in a fore and aft direction, the main body having a front surface disposed orthogonally in the fore and aft direction and a rear surface opposite the front surface;
• multiple first flow paths extending along the fore and aft direction in the main body such that a first fluid flows therethrough;
• and
• multiple second flow paths provided in the main body such that a second fluid that exchanges heat with the first fluid flows therethrough,
• wherein each first flow path includes an integrated part, a buffer part, and a divided part arranged in this order from an outlet for the first fluid of the main body in a direction opposite to a first flow direction which is a flow direction of the first fluid, the outlet being opened in the rear surface of the main body,
• the integrated part includes a single first flow path space defined by a peripheral wall that includes a pair of partition walls disposed to face each other in a cross section perpendicular to or intersecting with the first flow direction,
• the buffer part includes a single deformed flow path space formed by deforming the first flow path space such that first displacement parts of each of multiple pairs of first displacement parts that are provided at intervals on the pair of partition walls approach each other in a cross section perpendicular to or intersecting with the first flow direction,
• the divided part includes multiple divided flow path spaces formed by dividing the first flow path space in a cross section perpendicular to or intersecting with the first flow direction by connecting the first displacement parts of each pair of first displacement parts to each other,
• the integrated part, the buffer part, the divided part, or a combination thereof are included in each first flow path in an arbitrary cross section of the main body perpendicular to the first flow direction, and
• the closer each first flow path is to the outlet for the first fluid, the greater a ratio of an area occupied by the integrated part in each first flow path is.