Installation manual

www.dimplex.de 145
Noise Emissions from Heat Pumps 5.2.3
level. Fig. 5.2 on p. 145 graphically depicts the interrelationship
between emissions and immissions.
Fig. 5.2: 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
parties, 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 Instructions for Noise" (TA). The requirements
according to the TA for noise are listed in table 5.1 on page 108.
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
5.2.3 Sound propagation
As already described, the sound power spreads out upon an
increasing surface with increasing distance, so that the resulting
sound pressure level decreases at an ever-increasing distance.
Additionally, the sound pressure value depends upon a specified
point of the sound propagation. The following characteristics of
the environment influence the sound propagation:
 Shading due to major obstacles, such as buildings, walls or
land formations
 Reflections on reverberant surfaces such as rendering and
glass facades of buildings, or the asphalt and stone surfaces
of floors.
 Reduction of the level propagation by sound-absorbing
surfaces, such as fresh snow, bark mulch or similar.
 Increase or reduction due to air humidity and air temperature
or wind direction
6RXQGVRXUFH
(PLVVLRQ
,PPLVVLRQ
,PPLVVLRQORFDWLRQ
6RXQGSUHVVXUHOHYHO/
6RXQGSRZHUOHYHO/Z
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