The hollow polygon
prism-shaped
heat exchanger comprises a polygon
prism main body connected with a heat source, the polygon
prism main body is provided with a
refrigerant flow channel parallel to the axial direction of the polygon prism main body, and the
refrigerant flow channel is filled with foam
metal; the polygon prism body is further provided with an inlet allowing refrigerants to flow in and an outlet allowing the refrigerants to flow out, the refrigerants enter the
refrigerant flow channel through the inlet, and the refrigerants in the refrigerant flow channel flow out of the refrigerant flow channel through the outlet after heat exchange between the refrigerants in the refrigerant flow channel and a heat source is completed. A through first
air channel is formed in the middle of the polygon prism main body and is provided with an axial flow fan; the air guide cover is arranged outside the polygon prism body in a sleeving mode, and a second
air channel communicated with the first
air channel is formed between the outer wall of the polygon prism body and the inner wall of the air guide cover. According to the
heat exchanger, the foam
metal is filled in the refrigerant flow channel, the refrigerant is boiled and exchanges heat in the foam
metal, meanwhile, the air guide cover and the axial flow fan are integrated,
forced convection heat exchange is conducted, and the heat exchange efficiency of the
heat exchanger is greatly improved.