Technical data

www.dimplex.de 01.2012 | Project planning manual for heat pumps for heating and domestic hot water preparation | 57
Noise emissions from heat pumps 5.1.1
5.1.1 Emission and immission
The total sound emitted from a sound source (sound event) is re-
ferred to as acoustic emission. Sound source emissions are gen-
erally denoted as sound power level. The effect of sound upon a
specified location is referred to as acoustic immission. Acoustic
immissions can be measured as the sound pressure level. Fig.
5.1 on page 57 graphically depicts the interrelationship between
emissions and immissions.
Fig. 5.1: Emission and immission
Noise immissions are measured in dB(A), meaning sound level
values in relation to the sensitivity of the human sense of hearing.
Noise refers to the sound that disturbs neighbours or third par-
ties, and is extremely disadvantageous or potentially hazardous
to these. Guideline values for noise at immission sites outside of
buildings are stipulated in the DIN 18005 "Sound Protection in
City Buildings" or in the "German government's Technical In-
structions for Noise" (TA). The requirements in accordance with
the "German government's Technical Instructions for Noise" (TA)
are listed in Table 5.1 on page 57.
Table 5.1: Limit values for noise immissions in dB(A) according to DIN 18005
and the German government's Technical Instructions on Noise
Table 5.2: Typical sound levels
Sound source
Emission
Sound power level
L
W
Sound pressure level
L
Imission location
Imission
Regional categories Day Night
Hospitals and health spa facilities 45 35
Schools, nursing homes 45 35
Allotments, parks 55 55
Residential areas WR 50 35
General residential areas WA 55 40
Housing estates WS 55 40
Special residential areas WB 60 40
Central areas MK 65 50
Village areas MD 60 45
Mixed-use areas MI 60 45
Trading estates GE 65 50
Industrial areas GI 70 70
Sound source
Sound level
[dB]
Sound pressure
[μPa]
Perception
Absolute silence
Inaudible
0
10
20
63
Inaudible
Ticking of a pocket watch, quiet bedroom 20 200 Very quiet
Very quiet garden, air conditioning in a theatre 30 630 Very quiet
Residential area without traffic, air conditioning in offices 40 2 * 10 Quiet
Slow-moving brook or river, quiet restaurant 50 6.3 * 10 Quiet
Normal conversation, car 60
2 * 10
4
Loud
Loud office, loud speech, motorcycle 70
6.3 * 10
4
Loud
Heavy traffic noise, loud radio music 80
2 * 10
5
Very loud
Heavy goods vehicle 90
6.3 * 10
5
Very loud
Car horn at a distance of 5 m 100
2 * 10
6
Very loud
Pop group, foundry 110
6.3 * 10
6
Unbearable
Tunnel boring machine at a distance of 5 m 120
2 * 10
7
Unbearable
Jet taking off at a distance of 100 m 130
6.3 * 10
7
Unbearable
Jet engine at a distance of 25 m 140
2 * 10
8
Painful