Air demands of residential combustion appliances
Combustion appliances generally require air both for combustion itself and for dilution. The dilution device, known as the barometric damper on an oil system or as the draft hood on a gas system, is located downstream of the furnace heat exchanger and takes no part in the combustion nor heat exchange processes. It is primarily designed to isolate the combustion system from outside pressure fluctuations. However, it does represent the major air requirement of the heating system, typically at lead 3 times the air required for combustion. New oil- or gas-fired combustion systems, either under development or just reaching the market place, eliminate the dilution device and forcibly exhaust the combustion products either with a fan or a powerful combustion pulse. Such appliances, with their high efficiency and low air demand are well-suited to the low energy consuming homes of today. The combustion appliance requiring the most air is the fireplace. While new housing has an air change of 0.5 per hour or less, fireplaces can require nearly three-times this amount. Small airtight woodstoves, on the other hand, have little need for air. The fireplace under high fire, with its high draft and air demand can force reversal of the stack flow of the central furnace. On low fire, the reverse can occur, with incomplete combustion products from the fireplace or even a wood stove released into the living space. Experimental and field determinations of the air demands of the various appliances are presented, along with recommendations for solutions to the increasing problems with tight housing.
- Research Organization:
- Canadian Combustion Res. Lab., Ottawa
- OSTI ID:
- 5762349
- Report Number(s):
- CONF-840612-
- Journal Information:
- Proc., Annu. Meet., Air Pollut. Control Assoc.; (United States), Vol. 2; Conference: Air Pollution Control Association annual meeting, San Francisco, CA, USA, 25 Jun 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
FIREPLACES
VENTILATION
GAS APPLIANCES
HOUSES
AIR
AIRTIGHTNESS
BLOWERS
COMBUSTION
DILUTION
DRAFT CONTROL SYSTEMS
EXHAUST GASES
EXPERIMENTAL DATA
FURNACES
HEAT EXCHANGERS
OIL BURNERS
PRESSURE DEPENDENCE
RECOMMENDATIONS
APPLIANCES
BUILDINGS
BURNERS
CHEMICAL REACTIONS
CONTROL EQUIPMENT
DATA
EQUIPMENT
FLOW REGULATORS
FLUIDS
GASEOUS WASTES
GASES
INFORMATION
NUMERICAL DATA
OXIDATION
RESIDENTIAL BUILDINGS
THERMOCHEMICAL PROCESSES
WASTES
320101* - Energy Conservation
Consumption
& Utilization- Residential Buildings- (-1987)
421000 - Engineering- Combustion Systems