Direct evaporative heat exchangers, methods of manufacture thereof and applications thereof to multi-stage cooling systems

摘要

Direct evaporative Heat Exchanger, methods of manufacture thereof and applications thereof to multistage cooling systems are disclosed. The Direct Evaporative Heat Exchanger of this invention includes a number of polymer substrates where a top surface and a bottom surface of each of the polymer substrate are treated to render each surface hydrophilic which renders high thermal efficiency and enhanced dimensional stability. The Multi Stage Evaporative Cooling Systems comprise an indirect evaporation component where the fluid is pre-cooled indirectly with the heat exchangers, followed by the direct evaporative heat exchanger where the pre-cooled fluid is further cooled directly by evaporative cooling. The Direct evaporative heat exchanger of this invention can be utilized alone or in combination in a multistage cooling apparatus also including additional cooling components such as cooling coils or heat pipes. This Invention also relates to other Multi-Stage cooling devices.