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For most products it is appropriate to include the environmental correction factor. Estimating Radiated Sound Pressure in a Space The radiated sound path is similar to the return air sound path. The ceiling plenum (if any) can provide considerable attenuation. Converting from sound power to sound pressure can be accomplished with either the Schultz or Thompson equation. Radiated Sound Path Example Referring to the previous example, estimate the sound pressure in the space due to the radiated path.
This can be evaluated in a similar manner as shown in Diffuser Sound Path, page 50. 48 Application Guide AG 31-010 Return Air Sound Path Example Referring to the previous example, estimate the sound pressure in the space due to the return air path. The HVAC unit has a 24” by 24” return air elbow lined with 1” acoustic insulation. The Return Air sound power levels for the WSHP unit is: Band 63 125 250 500 1000 Lw 49 71 59 53 41 2000 27 4000 26 8000 23 Since this data is based on ARI 260, it is appropriate to apply the Environmental Correction Factor: Corr.
American Society of Heating, Refrigerating and Airconditioning Engineers, Inc. Atlanta, Ga. Application Guide AG 31-010 45 for a line source. g. Schultz or Thompson) because duct breakout is essentially a long line across the top of the room. Eq. 5 for SI 46 Application Guide AG 31-010 Duct Breakout Example Referring to the previous example, estimate the sound pressure in the space due to breakout from the main 22” by 22” rectangular duct. 7 feet. The ceiling is made up of Mineral Fiber tiles with 1 lb.