Use

Provides the room effect to enable the determination of the sound pressure level at a location within a room when subject to a sound power level. This element allows the user to input a known RT and volume to characterise the space. This is useful for measured spaces.

Screen Shot 2022-10-16 at 9.28.41 am.png

User Inputs

  1. Reverberation Time (s): Measured or separately calculated
  2. Room Volume (m$^3$)
  3. Distance (m):The distance from the source to the location in the room to enable the calculation of the direct component of noise in the room
  4. Source Directivity: The directivity of the source with respect to the direct component (free space, hemispherical, etc;)
  5. Noise Criterion: Can select NC curve if desired.

Screen Shot 2022-10-16 at 9.28.02 am.png

SoundSurfer Input

Sound Power Level (red node) entering the room or in the space.

Algorithm

Insertion loss is based on ASHRAE 2019 HVAC Applications Chapter 49 Noise and Vibration Control Section 2.5 associated formulae.

$L_{p,total}=L_w +10\log(Q/4\pi r^2 +4/R)$

$L_{p,direct}=L_w +10\log(Q/4\pi r^2)$