iDM AERO ILM 2-7 Technical Documentation Installation Instructions page 22

5. General description
Installation
1: Spherical spreading into 1/2 space
• sound attenuation by massive barriers e.g. buil-
facade and stone surfaces
• attenuation due to sound absorbing porous sur-
faces e.g. grass, trees
• reinforcement/reduction of by wind speed/direction
No is e - Im m is s ion
The noise caused by an source at a certain place is
expressed as Immission, the corresponding sound
2: Spherical spreading into 1/4 space
pressure level is called Immission level.The immissi-
on level at the relevant place of immission can either
be determined by measurements or calculation e.g.
forecasting method according „TA Lärm" (German
-
cially useful at the stage of planning.
According to this method of calculation, the expected
sound pressure level is calculated on the basis of the
sound power level of the heat pump, the distance
of the heat pump to the receiver location and the
installation situation (directivity correction Dc) of the
relevant place of immission according the following
formula:
3: Spherical spreading into 1/8 space:
L
WAeq
D
S
m
situations of heat pumps and the corresponding di-
rectivity correction.
22
(C) IDM Energiesysteme GmbH
Installation instructions AERO ILM