Heat recovery system

Patent · Tue Dec 16 04:00:00 EST 1986

OSTI ID:6968459

Kasbohm, M L

A retrofit unit is described for attachment to a hot air furnace system wherein the unit containing system comprises a fuel-burning hot air furnace with an air blower, a hot air duct, a cold air duct, a pipe for exhausting flue gas to the atmosphere and the retrofit unit. The retrofit unit comprises a gas to gas heat exchanger with low pressure drop. The heat exchanger has a means connecting one side of the heat exchanger between the furnace flue gas outlet and the flue gas exhaust pipe so that substantially all of the flue gas passes through the heat exchanger and a means connecting the other side of the heat exchanger between the outlet of the furnace air blower and the hot air duct to provide that between about 15 and 30% of the blower discharge air passes through the heat exchanger. The retrofit unit is adapted to function in combination with the existing air blower in the system.

• Assignee: NOV; NOV-87-039441; EDB-87-032926
• Patent Number(s): US 4629117
• OSTI ID: 6968459
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
AIR FLOW
BLOWERS
CHEMICAL REACTIONS
COMBUSTION
DUCTS
EQUIPMENT
EXHAUST SYSTEMS
FLUE GAS
FLUID FLOW
FUELS
FURNACES
GAS FLOW
GASEOUS WASTES
HEAT EXCHANGERS
HEAT RECOVERY EQUIPMENT
OXIDATION
PIPES
PRESSURE DROP
RETROFITTING
THERMOCHEMICAL PROCESSES
WASTES