FIELD: applicable in plate heat exchangers. SUBSTANCE: the plate heat exchanger has a great number of tubes passed through a set of corrugated plates, generally perpendicularly to them. The plates have tube holes. These holes are arranged in rows and surrounded by collars that have no wrinkles. The plates have also a certain number of short and elongated stiffening ribs located between the rows of holes. The rows of holes are located on the rows of arched plate corrugations. EFFECT: enhanced efficiency of operation of the existing plate heat exchangers. 7 cl, 3 tbl, 10 dwg
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