Patent ID: 7293604

Claim:
A heat exchanger for exchanging heat between first and second coolants, comprising: a first tube formed with a first flow passage through which the first coolant flows; a plurality of second tubes, each formed with a second flow passage through which the second coolant flows, wherein the first tube is sandwiched between a first adjacent second tube and a second adjacent second tube; a first inlet-connecting block connected to a first end of the first tube and having a first flow inlet communicating with the first flow passage; a first outlet-connecting block connected to a second end of the first tube and having a first flow outlet communicating with the first flow passage; a second inlet-connecting block connected to a first end of each of the second tubes and having a second flow inlet communicating with the second flow passage; and a second outlet-connecting block connected to a second end of each of the second tubes and having a second flow outlet communicating with the second flow passage; wherein the first tube and the second tubes are disposed such that the first and second flow passages are substantially perpendicular to one another, the first tube includes a plurality of pieces of tubes, the pieces of the first tube are disposed in parallel to one another along a longitudinal direction of the heat exchanger, and the second tubes are disposed in parallel to one another along a vertical direction of the heat exchanger, and the second tubes include an inflow tube group and an outflow tube group, and tubes that belong to the inflow tube group have first ends connected to the second inlet-connecting block and second ends connected to a terminal connecting block while tubes that belong to the outflow tube group have first ends connected to the terminal connecting block and second ends connected to the second outlet-connecting block.