Patent ID: 6911631

Claim:
Plate heat exchanger comprising at least one pile of plate elements, each of the plate elements having a central heat transferring part and an edge part ( 15 ) surrounding the heat transferring part, the heat transferring parts of the plate elements delimiting flow spaces between each other for at least one heat exchanging fluid (F 1 ) and every plate element being of a double wall construction and comprising two heat transferring plates ( 1 , 5 ; 2 , 6 ; 3 , 7 ; 4 , 8 ) of mainly the same size and pressed to mainly the same form, which heat transferring plates are close to each other but still define a space between their surfaces turned to each other, further comprising at least one layer element ( 16 ) in the space between the heat transferring plates ( 1 , 5 ; 2 , 6 ; 3 , 7 ; 4 , 8 ) in at least one of the plate elements, each layer element ( 16 ) comprising at least one electrically connected resistive layer making electrical heating of the layer element ( 16 ) possible.