Three-circuit plate heat exchanger

A three-circuit plate heat exchanger comprising a stack of at least 10 sheet metal plates having identical outside shape and dimensions, each of said plates being provided with six spaced holes identically located, holes of the same location having equal diameters in all plates, said plates forming channels for fluids of the three circuits, the holes in the plates forming six ports for inlet and outlet of said fluids of the three circuits,

• characterised in
• that the plates are of two different designs--the first plate design having two holes located in plate areas in a common plane, while the remaining four holes are located in plate areas displaced equally downwards relative the plane in which said two holes are located--the second plate design having four holes displaced correspondingly upwards relative to its remaining two holes which are located in plate areas in a common plane,
• that plates of the two different designs are located alternating in the stack of plates,
• that at each port the entrance to channels to be passed by fluids of the two circuits not passing said port is blocked by gluing, soldering or welding together of ring shaped plate areas adjacent to said holes, ring shaped spacers being inserted between plates which are spaced from each other at said ring shaped areas adjacent to said holes, and;
• characterised in that the blocking of the channels limited by the plates has been made to allow passage of flow of one fluid through each other channel, and so that one of the two remaining flows of fluid may pass through a number of channels which is greater than the number of channels open to the third flow of fluid.