Heat recovery device for exhaust flues
The heat recovery device has a flue pipe assembly including a section of standard flue pipe carrying a plurality of hollow, cylindrical heating tubes extending diametrically through the flue pipe section in axially spaced, parallel relationship and a separate housing defining an air flow chamber surrounding a portion of the flue pipe section. A fan inside the housing draws ambient air into the housing through an ambient air inlet located on the same side of the flue pipe assembly as the inlet of the heating tubes and propels a flow of air both through the heating tubes and over the outer surface of the flue pipe section towards a heated air outlet located on the same side of the flue pipe section as the discharge ends of the heating tubes. The flue pipe assembly is removably mounted on the housing so it can be removed in the event it fatigues and/or becomes plugged with carbon or creosote deposits during use. A thermostat on the flue pipe section turns the fan on and off when the temperature in the flue pipe section is respectively above and below a predetermined temperature. The total open area of the ambient air inlet and the heated air outlet is large enough so that, in the event the fan is inoperative, the natural flow of ambient air through the heating tubes and over the outer surface of the flue pipe is sufficient to prevent the flue pipe section from overheating.
- Assignee:
- IFI; EDB-86-101836
- Patent Number(s):
- US 4550772
- OSTI ID:
- 5856969
- 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
AIR FLOW
AUTOMATION
BLOWERS
CONTROL
CONTROL EQUIPMENT
DESCALING
DESIGN
ENERGY RECOVERY
EQUIPMENT
EXHAUST GASES
FLUID FLOW
FLUIDS
GAS FLOW
GASEOUS WASTES
GASES
HEAT PIPES
HEAT RECOVERY
HEAT RECOVERY EQUIPMENT
RECOVERY
SURFACE FINISHING
TEMPERATURE CONTROL
THERMOSTATS
WASTE HEAT UTILIZATION
WASTE PRODUCT UTILIZATION
WASTES