Abstract
Frequently, natural draft burner designs used in indirect heaters fail to meet the low noise standard of 85–88 dBA three feet from the flame arrestor. The noise encountered with indirect burner designs has been shown to be related to the gas velocities of the nozzle and firetube. Testing showed that when the nozzle velocity was sufficiently greater than the firetube velocity, the low frequency rumble that accompanies current designs ceased. Data obtained from field testing was used to construct a relationship between the burner noise level and the gas volume expansion ratio, burner air to fuel ratio, mixture flow rate, orifice velocity, burner area, and the number of burners. Knowing the above variables, which are easily calculated, a prediction of the burner noise was made.
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