Heat exchanger comprising condensed moisture drainage means

Claim 1

A multiple pass heat exchanger comprising: a plurality of hollow panels arranged in a stack with corrugated plates interspersed therebetween and each having a fluid passageway therein and an upper header and a lower header at opposite sides of said fluid passageway, said upper and lower headers being fixed to upper and lower headers of adjacent hollow panels and perforated to communicate respectively with the upper headers and lower headers of adjacent hollow panels; the fluid passageways and upper and lower headers being interconnected in such a manner that fluid flows therethrough in a multiple pass zig-zag pattern; drain means for draining water which deposits on said panels as a result of condensation of moisture contained in air flowing through said stack; and a sump for collecting the drained water; said drain means comprising vertically extending drain channel means defined between outer surfaces of the upper and lower headers of adjacent hollow panels which face each other.