Method and ducting system for hot gas heat recovery

F - Mech Eng,Light,Heat,Weapons – 28 – D

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257/29, 257/30

F28D 21/00 (2006.01) F23J 11/00 (2006.01) F23J 11/02 (2006.01) F24F 5/00 (2006.01)

Patent

CA 1102303

ABSTRACT OF THE DISCLOSURE A method and ducting system for collection of hot exhaust gases from paint curing oven heaters is disclosed for heat energy recovery in which a large collector duct is extended above the paint curing oven and into which is drawn large volumes of slightly warmed air heated by radiation from the paint curing oven or from secondary warm air sources. The vent stack of each paint curing oven heater is extended into the interior of the collector duct, directing the hot exhaust gases into the center of the large volume air stream in order to cool the gases and allow the collection without the need for insulated collection ducting, thermal expansion joints or flow balancing dampers. The heated air volume is passed through the heat recovery exchanger unit prior to be- ing exhausted to the atmosphere. In one alternate version, the collector duct is mounted directly to the roof of the paint curing oven and in communication with an air space formed in the roof and side wall panels, which collects air heated by the roof and walls, as well as any gas leakage from the interior of the oven. In another variation, a posi- tive pressure is created in the air space to preclude leakage from the oven interior.

321743

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