F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
62/84
F25D 31/00 (2006.01) F28C 1/14 (2006.01) F28D 5/02 (2006.01)
Patent
CA 1038636
ABSTRACT OF THE DISCLOSURE A high efficiency, induced draft, combination counter- flow-crossflow fluid cooling apparatus and method is provided which gives unexpectedly enhanced cooling of hot fluid by causing the fluid to pass upwardly through a series of serpentine heat exchange conduits in primarily countercurrent, indirect sensible heat exchange relationship with external cooling water gravita- ting from an overlying evaporative water cooling section. Cross- flowing air currents are pulled through the apparatus to evapora- tively cool the water not only in the upper cooling section but also in the sensible heat exchange area as well. Countercurrent flow of coolant water and fluid to be collected ensures that the coldest water and coldest fluid are in thermal interchange during the final stages of fluid cooling at the upper ends of the heat exchange conduits, so that the fluid temperature can approach that of the cold water as opposed to approaching the temperature of heated water found adjacent the lower ends of the conduits, which is conventional in cocurrent flow units of this type. The fluid conduit system is preferably arranged for causing increased fluid residence time, and thereby greatest temperature difference and longer heat exchange between the fluid and coolant water adjacent the air inlet of the apparatus where air and coolant water temperatures are lowest relative to the fluid to be cooled, so that an ideal countercurrent flow relationship is obtained and maximum heat transfer is assured. An underlying water collection basin is also employed in the apparatus which is constructed to permit collection of cooling water to a level above that of the lowermost portions of the hot fluid conduits, in order to allow the hot fluid traveling through the conduits to beat the col- lected water to prevent freezing thereof during wintertime oper- ations when the internal water pump is shut down causing the stoppage of all evaporative cooling and hence a raising of the lower water basin level.
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