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US 4,253,821 AGranted
Method and ducting system for hot gas heat recovery
AssigneeSchweitzer Industrial Corporation
InventorNorman F. Bradshaw
Life of this patent
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AssigneeSchweitzer Industrial Corporation
InventorNorman F. Bradshaw
Estimating the term…
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 being 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 positive pressure is created in the air space to preclude leakage from the oven interior.
In combination, a heat recovery system and a paint curing oven of the type including a plurality of fuel-fired heaters, each having an exhaust vent stack directly receiving the exhaust gases from a respective one of said fuel-fired heaters, said system recovering heat from said plurality of paint curing oven fuel-fired heaters and including:
A method of recovering heat from a plurality of sources of relatively high temperature gases in a single collector duct, the method including the steps of:
A method of recovering heat energy in a collector duct and utilizing said energy in utilization equipment from a paint curing oven, said paint curing oven being of the type having a plurality of fuel-fired heaters, each having an exhaust stack vent, said oven including walls and a roof, the method including the steps of:
A method of providing a cooled and sealed building structure having an interior space defined by walls and a roof comprising the steps of:
Dependencies are inferred from the claim text.