Heat exchanger system and ducting arrangement therefor

Claim 1

A heat exchanger system and ducting arrangement therefor for transferring heat from a first fluid emanating from a first passage to a second fluid emanating from a second passage and circulating therethrough, comprising: pair of longitudinally oriented and side-by-side heat exchanger units individually having a plurality of first and second primary surface heat exchanging plate assemblies alternately arranged in a generally upright, transversely oriented and longitudinally stacked manner and defining a plurality of first fluid flow paths and a plurality of second fluid flow paths alternately therethrough and so constructed and arranged that an elongated space is defined between said units for substantially the full length thereof: a bifurcated inlet duct for delivering the first fluid upwardly from said first passage to said heat exchanger units and said first fluid flow paths, and including a pair of longitudinally extending channels individually connected upwardly to said heat exchanger units; a pair of exhaust conduits for conducting the first fluid upwardly away from said heat exchanger units after heat is extracted therefrom; a common inlet plenum including a cover spanning between said heat exchanger units generally above said elongated space, a pair of end walls spanning between the ends of the heat exchanger units, and a centrally disposed duct connected to the heat exchanger units, said centrally disposed duct being longitudinally interposed between said channels and of a construction sufficient for delivering the second fluid oppositely from said second passage upwardly to said elongated space and therefrom in two separate directions symmetrically oppositely outwardly to said heat exchanger units and to said second fluid flow paths; and a pair of outlet manifolds for conducting the heated second fluid from said heat exchanger units.