| 摘要 |
The present invention concerns among other things a plate heat exchanger comprising at least one pile of plate elements, which plate elements each one has a central heat transferring part and an edge part (15) surrounding this part, the heat transferring parts of the plate elements between each other delimiting flow spaces for at least one heat exchanging fluid (F1) and every plate element being of a double wall construction and comprising two heat transferring plates (1, 5; 2, 6; 3, 7; 4, 8) mainly of the same size and pressed to mainly the same form which are situated close to each other but still deifne a space between their surfaces which are turned towards each other and allowing that a heat exchanging fluid (F1) which is leaking out through a hole in the one heat transferring plate (1, 5; 2, 6; 3, 7; 4, 8) is led between the heat transferring plates to the edge part (15) of the plate elements. At least one layer element (16) is present in the mentioned space between the mentioned heat transferring plate (1, 5; 2, 6; 3, 7; 4, 8) in at least one of the mentioned plate elements, every layer element (16) comprising at least one electrical connected resistive layer making electrical heating of the layer element (16) possible.
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