| 摘要 |
PROBLEM TO BE SOLVED: To provide a plate heat exchanger at a low cost which is highly reliably even in the case of dealing with a corrosive solution. SOLUTION: In a plate heat exchanger which has a plate aggregate 12 constituted by laying a plurality of plates 30 upon another in such a way that flow passage spaces R are formed between their surfaces, and brazing the plates 30 to each other, and causes that exchange between two kinds of heat media by alternately making the media to flow through adjacent spaces R, the brazing in the spaces R is performed by using different brazing filler metals 54 and 56 in accordance with the kinds of the media made to flow through the spaces R.
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