57 Shell (e.g. 94) for plate-type apparatus to carry out thermo-dynamic processes based on heat exchange between flowing fluids which comprises spaced heat conductive confining plates (50a, 50b) and fluid conducting passages (56c,56d,56e) therebetween. At least one of the confining plates (50a,50b) is provided with at least one diaphragm (58a,58b) adjacent to a fluid conducting passage. The diaphragm (58a,58b) in the confining plates (50a, 50b) ensures, in addition to heat transfer, also interactions of fluid pressures. Thus, positive circulation of fluids, operation of control valces, etc., are rendered possible by means located within the shells themselves.
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