Platform heaters /plate warmers with an electrically heated layer in double -walled panels

摘要

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 (F 1 ) 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.