(12) United States Patent ao) Patent No.: us 6,581,402 B2
Maisotsenko et al. (45) Date of Patent: Jun. 24,2003
(54) METHOD AND PLATE APPARATUS FOR DEW POINT EVAPORATIVE COOLER
(75) Inventors: Valeriy Maisotsenko, Aurora, CO
(US); Leland E. Gillan, Denver, CO
(US); Timothy L. Heaton, Arvada, CO
(US); Alan D. Gillan, Denver, CO (US)
(73) Assignee: Idalex Technologies, Inc., Arvada, CO (US)
( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/966,928
(22) Filed: Sep. 27, 2001
(65) Prior Publication Data
US 2002/0073718 Al Jun. 20, 2002
An improved method and apparatus for indirect evaporative cooling of a fluid stream to substantially its dew point temperature. Plate heat exchanger has perforations 11 and channels 3, 4 and 5 for gas or a low temperature for liquids on a dry side and wet side. Fluid streams 1 flow across the dry side 9, transferring heat to the plate. Gas stream 2 flows across the dry side and through perforations to channels 5 on wet side 10, which it then cools by evaporative cooling as well as conductive and radiative transfer of heat from plate. A wicking material provides wetting of wet side. In other embodiments, a desiccant wheel may be used to dehumidify the gas, air streams may be recirculated, feeder wicks 13 and a pump may be used to bring water from a water reservoir, and fans may be used to either force or induce a draft. The wicking material may be cellulose, organic fibers, organic based fibers, polyester, polypropylene, carbon-based fibers, silicon based fibers, fiberglass, or combinations of them. The device may be operated in winter months to scavenge heat from exhaust gases of a space and thus pre-heat fresh air, while simultaneously humidifying the fresh air.
39 Claims, 20 Drawing Sheets