- Author
- Liu, S. T. | Kelly, G. E. | Terlizzi, C. P.
- Title
- Testing and Rating of an Atmospheric, Gas-Fired Furnace Equipped With a Burner Air Inlet Damper.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Sponsor
- Department of Energy, Washington, DC
- Report
- NISTIR 4717, November 1991, 60 p.
- Distribution
- Available from National Technical Information Service
- Keywords
- furnaces | burners | dampers | tracer tests | ANSI/ASHRAE 103 | atmospheric burner | burner air inlet damper | DoE test procedure | flue draft factor | loss factor | off-cycle loss | optional procedure for power burner | tracer gas test
- Abstract
- An atmospheric furnace with an integral draft diverter and an electro-mechanical burner box inlet damper was tested by the tracer gas method for the development of a test procedure. Tracer gas tests were conducted under two conditions: with the diverter open, and with the diverter sealed and the stack restricted. Test results indicated that the flue gas flow patterns inside the heat exchanger were different for the two conditions. There was reverse flow in one of the clam shells when the diverter was open, but no flow reversal when the diverter was sealed. The off-cycle sensible loss which was a measure of the effectiveness of the burner box inlet damper gave similar value for both conditions. Because of the change in flow pattern and the fact that the furnace normally operated in the field with the diverter open, a recommended test procedure was developed which requires that the tracer gas test should be conducted with the diverter open. A calculation procedure was developed to compute the annual fuel utilization efficiency for the type of furnaces that employ a burner box inlet damper or flue damper for off-cycle loss reduction.