Patent ID: 8434226

Claim:
A method for manufacturing a heat exchanger, the heat exchanger including pipes through which a first fluid flows, and a housing, wherein the housing has a pair of openings that expose ends of the pipes on both sides, an inlet for introducing a second fluid into the housing, and an outlet provided so as to be opposed to the inlet, the outlet being for discharging the second fluid, and the second fluid comes into contact with surfaces of the pipes, the method comprising the steps of: (a) forming a heat exchange module that includes a plurality of pipes arrayed in parallel with one another in a two-dimensional form, and fixing members that are present in interstices around the pipes to hold the array of the plurality of pipes, wherein four pieces of the fixing members are arranged along a central axis direction of the pipes with spaces therebetween; (b) providing walls on respective outer peripheral portions of the fixing members, wherein each of the walls has a through hole going through in a thickness direction of the wall, and protrudes toward outside of the heat exchange module; (c) arranging flow path members, each of which is arranged between the walls on the outer-side fixing member positioned closely to an end of the tube and on the inner-side fixing member adjacent to the outer-side fixing member so as to communicate with the through holes provided in the walls; (d) housing the heat exchange module into the housing, and bringing parts of the outer peripheral portions of the fixing members where the walls are not provided, and the walls, into close contact with inner surfaces of the housing; and (e) while rotating the housing around an axis that passes through the centers of the inlet and the outlet, filling a resin material into interstices around the pipes present between one of the openings of the housing and the outer-side fixing member adjacent thereto, interstices around the pipes present between the other opening of the housing and the outer-side fixing member adjacent thereto, and interstices around the pipes present between the two inner-side fixing members, and further, forming a flow path between the two inner-side fixing members through which the second fluid introduced through the inlet is guided to the outlet.