The device concerns among other things a plate heat exchanger having at least
one pile of plate elements, each of which plate elements has a central heat transferring
part and an edge part (15) surrounding this part, the heat transferring
parts of the plate elements delimiting flow spaces between one another for at least
one heat exchanging fluid (F1) and every plate element being of a double
wall construction and having two heat transferring plates (1, 5; 2, 6; 3, 7;
4, 8) with a space therebetween. At least one layer element (16) is
present in the space between the heat transferring plates (1,5; 2,6; 3,7; 4,
8) in at least one of the plate elements, every layer element (16) having
at least one electrical connected resistive layer making electrical heating of
the layer element (16) possible.
