To provide a heat exchanger or the like capable of easily confirming formation of a corroded pore from the external when the corroded pore is formed on a heat exchanging plate, preventing mixing of fluids in heat exchanging, and securing safety.
In this heat exchanger constituted by successively holding a first composite board element, the heat exchanging plate 50 and a second composite board element by side plates and joining the same, a fluid discharge passage 53 is formed on the heat exchanging plate 50 in a state of being branched from an opening 54 of a side face and extending like a comb. The fluid flowing in from the corroded pore 55 to a fluid discharge passage 53 is discharged from the opening 54 to the external of the heat exchanger, even when the corroded pore 55 is formed by corrosion of front and rear surfaces of the heat exchanging plate 50 caused by contact with the fluid. Thus the mixing of the fluids can be prevented, and the existence or nonexistence of the corroded pore 55 can be easily confirmed by monitoring the opening 54.
JOKO YOSHIYUKI
Torii Kazuhisa
Takayoshi Tagawa
Naoya Kamata
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