F - Mech Eng,Light,Heat,Weapons – 23 – L
Patent
F - Mech Eng,Light,Heat,Weapons
23
L
257/22, 126/23
F23L 17/00 (2006.01) F24H 3/08 (2006.01)
Patent
CA 2003802
RHEE B7557 ABSTRACT An induced draft, fuel-fired upflow furnace is provided with a compact, high efficiency heat exchanger having horizon- tally spaced apart inlet and outlet manifold structures which are innerconnected by a horizontally spaced series of vertically ser- pentined, relatively small diameter flow transfer tubes. Larger diameter inlet flow tubes are positioned beneath the balance of the heat exchanger, extend parallel to the transfer tubes, and have upturned discharge ends connected to the underside of the inlet manifold. The heat exchanger is configured so that its total vertically facing peripheral surface area is considerably Larger than its total horizontally facing peripheral surface area, thereby significantly reducing undesirable outward heat loss through the vertically extending furnace housing side walls upon burner shut off and increasing the overall efficiency rating of the furnace. The small diameter, serpentined transfer tubes create a significant flow restriction within the heat exchanger to thereby increase heat transfer to the continuing supply air flow through the furnace after burner shut off. The reduced mass of the heat exchanger, compared to conventional clamshell heat exchangers, also desirably lessens its cold startup "dwell time" to inhibit internal heat exchanger corrosion. A pilot bypass system is provided to inhibit internal heat exchanger corrosion potentially caused by the continuously generated combustion pro- ducts of a standing pilot flame within the furnace housing by venting such combustion products directly through the draft inducer fan outlet section and into the exhaust flue, thereby bypassing the heat exchanger, during idle periods of the furnace.
Harrigill William T.
Shellenberger Timothy J.
Blake Cassels & Graydon Llp
Rheem Manufacturing Company
LandOfFree
Induced draft, fuel-fired furnace apparatus having an... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Induced draft, fuel-fired furnace apparatus having an..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Induced draft, fuel-fired furnace apparatus having an... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1450216