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摘要

The invention relates to a heat exchanger plate, and a plate heat exchanger including a plurality of heat exchanger plates. Each heat exchanger plate include a heat transfer area, an edge area, that extends around and outside the heat transfer area, and a number of portholes that extend through the heat exchanger plate and are located inside and in the proximity of the edge area. The porthole is defined by a porthole edge and has a center. The porthole edge has a first edge portion, that faces the edge area, and a second edge portion that faces the heat transfer area. The first edge portion has a corrugation seen from the center of the porthole. The second edge portion has a substantially plane shape seen from the center of the porthole.