Flue gas heat recovery apparatus

Patent · Tue Aug 30 04:00:00 EDT 1983

OSTI ID:5582217

Brown, L W

A flue gas heat recovery apparatus is employed with a system of appliances such as a gas furnace and hot water heater, each having separate exhaust gas flues. The apparatus includes a gas-to-liquid heat exchanger in thermal communication with the two flues to simultaneously extract heat therefrom and liquid-to-gas heat exchanger disposed within the furnace cold air return duct. A pump circulates water between the exchangers in response to a control signal to employ the recovered heat to preheat the cold air entering the furnace through the cold air return duct. A hysteretic control circuit monitors exhaust gas temperature and provides for system operation between high and low gas temperature limits. In the preferred embodiment of the invention, a furnace blower override feature is employed to energize the blower during periods of pump operation.

• Assignee: EDB-84-010204
• Patent Number(s): US 4401261
• OSTI ID: 5582217
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320101 -- Energy Conservation
Consumption
& Utilization-- Residential Buildings-- (-1987)
320304* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Waste Heat Recovery & Utilization
BUILDINGS
DESIGN
ENERGY CONSERVATION
ENERGY TRANSFER
EQUIPMENT
FLUE GAS
FURNACES
GASEOUS WASTES
HEAT RECOVERY EQUIPMENT
HEAT TRANSFER
HOUSES
RESIDENTIAL BUILDINGS
WASTE HEAT UTILIZATION
WASTE PRODUCT UTILIZATION
WASTES