Abstract: A evaporative cooling device is described having a pair of heat conducting plates (102) arranged in spaced, generally parallel relationship with spacing elements (104) separating the plates (102) from one another and defining primary (106) and secondary (108) flow channels between the plates. Inlet ducts (114) are connected to the primary (106) channels and outlet ducts connect from the primary (106) and secondary (108) channels. A water distribution system (116) is also provided to supply water to the secondary (108) channels such that a primary air flow (A) through the primary (106) channels may be cooled by heat conduction along the plates (102) to cause evaporation of the water into a secondary air flow (B) through the secondary (108) channels.

Abstract: A dewpoint cooler comprises: two medium circuits coupled mutually via a heat-conducting wall, through which circuits two media can flow, wherein the second medium contains gas, which wall has heat-conducting protrusions; wherein the wall and the protrusions are covered with a hydrophilic coating which can absorb an evaporable liquid and relinquish it again through evaporation such that the wetted coating, and thereby also the heath-conducting surfaces and the protrusions, are cooled; a wetting unit for subjecting the secondary medium to wetting by the evaporable liquid by evaporating liquid from the coating such that the evaporated liquid entrained by the secondary medium extracts heat from the primary medium via the heath-conducting wall. The coating consists of a porous technical ceramic material, such as a mineral wool.