Counterflow Air to Air Heat Exchange

This is an initial design for a printable parametrised counterflow air to air heat exchange (HX).

Typically counterflow HXs use 2 sets of interleaved plates, with the supply air flowing through one set and the extract air flowing through the other set. Heat is transferred from the extract air to the incoming, thereby keeping the heat in the building while replacing the air. In this design rather than using a set of parallel plates the airflows have been mingled together by creating a compo