Patent ID: 7740058

Claim:
A plate heat exchanger comprising: a plurality of stacked trough-shaped heat exchanger plates having edges bearing against one another, having at least four inlet and outlet openings in the corners of the heat exchanger plates which form two vertical ducts for a cooling fluid and two vertical ducts for a second fluid in the stack, and providing flow ducts located between the heat exchanger plates for the cooling fluid and for the second fluid, the flow ducts being fitted with inserts; wherein at least one of the inserts includes plate-like sections including the openings and a plurality of guide ducts with a width formed to receive the cooling fluid, and a turbulence generator in a central region between the plate-like sections; wherein the openings are arranged in the corners in such a way that only a narrow strip remains between each opening and a respective edge, the narrow strip including a guide duct which has a significantly smaller width than the width of the other guide ducts.