Combustion gas heat recovery apparatus
A secondary heat exchanger is positioned within a cold air return plenum of a forced air gas or oil fired furnace to preheat cold air drawn into the furnace through the cold air plenum. A heat recovery flue pipe is connected between a primary flue pipe of the furnace and the secondary heat exchanger, and an exhaust pipe is connected between the secondary heat exchanger and the outside of a structure served by the furnace. A secondary blower coupled to the exhaust pipe draws hot combustion gases from the primary flue pipe through the heat exchanger and exhausts cooled combustion gases to the outside. The secondary heat exchanger comprises a combustion gas inlet plenum and a combustion gas outlet plenum, with a plurality of heat conducting pipes sealingly connected therebetween. Each of the heat conducting pipes is arranged to define a circuitous path between the inlet plenum and the outlet plenum, with each heat conducting pipe defining at least two aligned linear radiating surfaces over which cold air is drawn. Heat conducting fins are intimately connected to the heat conducting pipes and a condensate drain is provided in the lower extremities of the heat conducting pipes to drain condensate from the secondary heat exchanger.
- Assignee:
- IFI; EDB-86-101826
- Patent Number(s):
- US 4558689
- OSTI ID:
- 5745855
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
320304* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Waste Heat Recovery & Utilization
BLOWERS
CONTROL EQUIPMENT
DESIGN
DRAFT CONTROL SYSTEMS
EFFICIENCY
ENERGY EFFICIENCY
ENERGY RECOVERY
EQUIPMENT
EXHAUST SYSTEMS
FLOW REGULATORS
FLUE GAS
FURNACES
GAS FURNACES
GASEOUS WASTES
HEAT EXCHANGERS
HEAT RECOVERY
HEAT RECOVERY EQUIPMENT
OIL FURNACES
RECOVERY
WASTES