Plate for heat exchanger and heat exchanger

Abstract

A plate () for a heat exchanger for heat exchange between a first and a second medium is configured with inlet and outlet portholes (and) for the first medium and inlet and outlet portholes (and) for the second medium and with a first heat transferring surface (A) for the first medium and a second heat transferring surface (B) for the second medium. The first heat transferring surface (A) is configured with at least one barrier () which forms part of a guide for the flow of the first medium when said first medium passes between the portholes () therefor, and the plate () is configured with the portholes (and) for the first and second medium respectively, and with the barrier located so relative to each other on the first heat transferring surface that they permit formation of a U-shaped or sinusoidal through-flow duct for the first medium which will permit passage of the flow thereof around the inlet porthole () or both portholes () for the second medium during passage of said first medium between the portholes therefor. A heat exchanger comprises a stack of the above-mentioned plates. An air cooler comprises the above-mentioned heat exchanger.