Patent ID: 9689626
Date: 2017-06-27
CPC Classifications: B01D,F24F,F28D,F28F,Y02B,Y10T

Claim:
1. An evaporative heat exchanger comprising: a plurality of generally planar, heat conducting plates stacked in a Z-direction in spaced, generally parallel relationship; spacing elements of plastics material extending in an X-direction, separating the plates from one another and defining separated first and second flow channels between pairs of adjacent plates for flow in a first direction and a second direction respectively; wherein the plates extend in a Y-direction through both the first flow channel and the second flow channel and are divided into fins, the fins having a chord length and being separated from each other in the X-direction and being offset from the plate in the Z-direction to at least four offset positions, the fins being arranged in repeating groups, whereby the fins of each repeating group are staggered with respect to one another in the X-direction and offset from one another in the Z-direction such that a pitch of corresponding fins in adjacent groups in the X-direction corresponds to at least three times the chord length, the heat exchanger further comprising a water retaining surface on the fins in at least the second flow channel; and a source of water for wetting the fins in the secondary channel.