Patent ID: 7987682

Claim:
An evaporative heat exchanger comprising: at least one working channel comprising primary and secondary surfaces; for each working channel, a plurality of product channels comprising primary and secondary surfaces; and a liquid supply providing an evaporative liquid to the secondary surfaces; wherein a product fluid may circulate through the product channels in heat exchanging contact with the primary surfaces thereof and wherein the primary surface of the working channel is in flow communication with the secondary surfaces of both the working channel and the product channels such that a working fluid may flow first over a primary surface of the working channel and subsequently over the secondary surfaces; further comprising a housing, the working channel and the product channels being located within the housing whereby an interior space between the housing and the working and product channels defines a flow area for the working fluid to flow over the secondary surfaces; the working channel has an inlet communicating with an exterior of the housing and an outlet communicating with the interior space; the product channels each have an inlet and an outlet each of which communicates with an exterior of the housing; and wherein the inlets of the working channel and product channels communicate with ambient air, and that the outlet of each product channel communicates with a living space in a building or vehicle.