Abstract: Electric boiler for heat-transfer liquid (FC) comprising a set of plates (P) having corrugations on both their faces, and which include, in their corners, openings (3, 4, 5, 6) allowing circulation of fluid. Said assembly consists of at least one module comprising two stamped plates (P), the corrugations of which are in the same sense on both their faces between which at least one heater block (I) is inserted, within which heater block a resistance element (R) is embedded, being in the form of a block which also includes orifices (3, 4, 5, 6) as well as herringbone corrugations on both its faces (A) and (B).

Abstract: This plate heat exchanger with parallel and counterflow circulation of the heat-exchange fluids is constructed by stacking a determined number of ribbed plates (4) of the same size, clamped against one another between two flanges (1,2), said plates having openings (5,6,7,8) in their corners, defining, within the stack, supply and outlet channels respectively for the heat-exchange fluids.The plates are made of bulk machined graphite, previously impregnated with a waterproofing material, and in particular a resin.

Abstract: Gas/liquid heat exchanger with condensation.It is presented in the form of blocks juxtaposed (1) within an enclosure (2) and in which two series of channels (3,4) are pierced, these blocks (1) being disposed within an enclosure (2), the space between the enclosure (2) and the central column which the blocks form being separated into two chambers (6,7), connected respectively to the gaseous phase supply circuit (10) and the other to the circuit (14) for the evacuation of the condensates formed.

Abstract: The invention relates to a heat exchanger incorporating independent circuits, constituted by modular elements in the form of blocks maintained juxtaposed inside an enclosure defining independent chambers for each of the fluids. Each block presents superposed channels opening out alternately into the lateral fluid circulation chambers, these channels being defined by the space between the pressed plates, comprising edges turned back through 90.degree. alternately in opposite directions and which form, in each angle, a vertical edge enabling them to be fixed to the lateral walls defining the fluid circulation chambers. The plates are associated with one another by butt-welding of the ends of the bent edges and the vertical-edges.