- Author
-
Park, C.
|
Mulroy, W. J.
|
Kelly, G. E.
- Title
- Study of the Dynamic Flue-Gas Temperature and Off-Period Mass Flow Rate of a Residential Gas-Fired Furnace. Final Report.
- Coporate
- National Bureau of Standards, Washington, DC
- Sponsor
- Department of Energy, Washington, DC
- Report
-
NBS TN 999,
July 1979,
- Distribution
- Available from National Technical Information Service
- Keywords
-
gas furnaces; flue gases; temperature; mass flow; flow rate; residential buildings; efficiency; fuel consumption; damping
- Abstract
- The flue-gas temperature and mass flow rate through a gas-fired furnace were studied in the laboratory. Temperature profiles were measured under cycling conditions and compared with profiles predicted mathematically using data obtained while the furnace was cooling down from steady-state operation and warming up from equilibrium. The mass flow rates at various flue-gas temperatures were measured using both a vane anemometer and a tracer-gas technique, and these results are compared with the mass flow rate predicted by the theoretical equations. The effect on the off-period flow rate of automatic stack dampers having different sized damper openings was experimentally determined. Theoretical equations are presented for predicting the effectiveness of a stack damper as a function of the ratio of the area of the damper to the area of the stack and a system friction factor.