HEAT EXCHANGER AND ARRANGEMENT STRUCTURE OF HEAT EXCHANGER

To provide a heat exchanger capable of obtaining a necessary radiation amount and an outlet water temperature of a low water temperature radiator even in a case of providing the low water temperature radiator and a high water temperature radiator.SOLUTION: A heat exchanger (2) comprises: a first heat exchange unit (20) in which a plurality of first heat exchange tubes are arranged along a first direction, the first heat exchange tubes passing a first heat exchange medium that cools a first heat source for air cooling; and a second heat exchange unit (22) in which a plurality of second heat exchange tubes are arranged along the first direction, the second heat exchange tubes air-cooling a second heat exchange medium for cooling a second heat source. When a required outlet temperature of the first heat exchange unit (20) is lower than a required outlet temperature of the second heat exchange unit (22), the first heat exchange unit (20) is arranged so as to be farther from a road surface than the second heat exchange unit (22).SELECTED DRAWING: Figure 1 【課題】低水温ラジエータと高水温ラジエータとを設ける場合であっても、低水温ラジエータの必要放熱量と出口水温とを得ることができる熱交換器を提供する。【解決手段】熱交換器（２）は、第１熱源を冷却する第１熱交換媒体を通過させて空冷するための第１熱交換チューブが第１方向に沿って複数本配列された第１熱交換部（２０）と、第２熱源を冷却する第２熱交換媒体を空冷するための第２熱交換チューブが第１方向に沿って複数本配列された第２熱交換部（２２）と、を備えている。第１熱交換部（２０）の出口要求温度が第２熱交換部（２２）の出口要求温度よりも低い場合に、第１熱交換部（２０）を第２熱交換部（２２）よりも路面から離隔するように配置する。【選択図】図１