Heat exchanger, cooling device, projector, and electronic device

A heat exchanger comprising:

• a housing having a first side surface and a second side surface located on opposite sides, a third side surface and a fourth side surface that intersect both the first side surface and the second side surface, and that are located on opposite sides, and an accommodation chamber surrounded by the first side surface, the second side surface, the third side surface, and the fourth side surface;
• a first flow port disposed in the first side surface in a range from a half of a length to the third side surface from a center of the first side surface to the third side surface, and through which a refrigerant can flow;
• a second flow port disposed in the first side surface in a range from a half of a length to the fourth side surface from a center of the first side surface to the fourth side surface, and through which the refrigerant can flow;
• a third flow port that is disposed in the second side surface and through which the refrigerant can flow;
• a first main flow path that communicates with the outside of the housing via the first flow port and that extends in the accommodation chamber along a first target side surface that is one side surface of the first side surface and the third side surface;
• a second main flow path that communicates with the outside of the housing via the second flow port and that extends in the accommodation chamber along a second target side surface that is one side surface of the first side surface and the fourth side surface;
• a third main flow path that communicates with the outside of the housing via the third flow port and that extends in the accommodation chamber along one main flow path of the first main flow path and the second main flow path;
• a plurality of first branch flow paths that are provided at a plurality of locations in the first main flow path and that branch off from the first main flow path;
• a plurality of second branch flow paths that are provided at a plurality of locations in the second main flow path and that branch off from the second main flow path;
• a plurality of third branch flow paths that are provided in a portion of the third main flow path on the first main flow path side and that communicate with at least one first branch flow path of the plurality of first branch flow paths;
• and
• a plurality of fourth branch flow paths that are provided in a portion of the third main flow path on the second main flow path side and that communicate with at least one second branch flow path of the plurality of second branch flow paths, wherein
• a dimension ratio of a length of the accommodation chamber along the first side surface to a length of the accommodation chamber along the third side surface is 0.6 or more and 10.0 or less.