Method of manufacturing a heat-humidity exchange plate of an enthalpy air-to-air exchanger

A method of manufacturing a heat and humidity exchange plate for an air-to-air counterflow enthalpy heat exchanger, the method comprising the following steps:

• (a) continuously forming a supporting member of the exchange plate in a form of an expanded metal structure from a strip of metal foil by sitting the metal foil in a transverse direction, then stretching the metal foil in a longitudinal direction, and then rolling over an entire width of the strip of stretched metal foil;
• (b) annealing the expanded metal structure;
• (c) providing a vapour-permeable polymeric membrane on the annealed expanded metal structure;
• (d) forming corrugated and embossed shaped elements on the annealed expanded metal structure with the vapour-permeable polymeric membrane applied thereon by means of omnidirectional deformation;
• and
• (e) creating a circumferential shape of the exchange plate by removing excess edges from the annealed expanded metal structure with the vapour-permeable polymeric membranes.