Abstract: A heat exchange process and apparatus for supplying cool air or cool water to a location by cooling a recirculating working fluid utilized in the heat exchange process wherein a primary air stream or second working fluid is cooled by indirect heat exchange with the working fluid and wherein the working fluid is initially evaporatively cooled by heat exchange with a first waste air stream and subsequently divided into separate circulating circuits with a first portion of the working fluid further evaporatively cooled by a second waste air stream which has been indirectly cooled by indirect heat exchange with a second portion of the working fluid prior to the first portion of the working fluid being utilized indirectly to cool the primary air stream or a second working fluid.

Abstract: A heat exchange process and apparatus for supplying cool air to a given location wherein a primary air stream is initially cooled by indirect heat exchange with a recirculating working fluid and thereafter evaporatively cooled by direct heat exchange with the working fluid flowing through a primary humidifying and cooling chamber. The working fluid is initially cooled in at least secondary, and preferably a secondary and intermediate, humidifying and cooling chamber by air streams which are separate from the primary air stream.