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Empirical Boiler Noise Prediction    1/1

Strutt|Input Data|Empirical|Boiler inserts sound power levels into the active row of the worksheet. Sound power levels can be calculated using three different methods:

• Laymon Miller
• Edison Electric - General Purpose Boiler
• Edison Electric - Large Power Plant Boiler

Input required is selection of the formula to use and the boiler power rating.
The formulas that are implemented in each of the options are:

Laymon Miller
References sound power levels, dB, (below) according to the range that the power rating falls into.
 Heating Capacity, kW 490 - 2942 2943 - 19620 31.5 Hz 99 102 63 Hz 99 102 125 Hz 98 101 250 Hz 96 99 500 Hz 93 96 1 kHz 90 93 2 kHz 87 90 4 kHz 84 87 8 kHz 81 84

Edison Electric - General Purpose Boiler
Overall radiated sound power level is given by:

L_W = 95 + 4log_10(kW) (dB re 10-12 W)

Edison Electric - Large Power Plant Boiler
Overall radiated sound power level is given by:

L_W = 84 + 15log_10(MW) (dB re 10-12 W)
The octave band levels are then calculated by subtracting the appropriate corrections (dB) listed below:

 Boiler Type General Purpose Large Power Plant 31.5 Hz 6 4 63 Hz 6 5 125 Hz 7 10 250 Hz 9 16 500 Hz 12 17 1 kHz 15 19 2 kHz 18 21 4 kHz 21 21 8 kHz 24 21

References:

• Miller, L.N, Noise Control for Buildings and Manufacturing Plants, Table 7-5
• Bies, D., Hansen, C., Engineering Noise Control, p546

Comments or suggestions to
strutt@arup.com