Kermi heat pumps operate exceedingly quietly. With their exceptionally effective sound and vibration absorption they generate scarcely more noise emission than a ticking alarm clock. As a result, these heating systems can in most cases be conveniently installed in industrial areas and outdoors without addtional construction measures. Operation as quiet as a whisper and night reduction mode ensure that the systems installed outdoors and indoors will not disturb the neighbours.
At an increasing distance from the sound source, sound scatters onto a larger surface and decreases at certain points as a result. However, sound reflections on obstacles like walls, for example, usually amplify the sound. Therefore, surrounding sound-reflecting surfaces have to be taken into account as regards sound propagation in each instance. Naturally, the particular material properties play a role as well, which, however, are not taken into account here.
The technical instructions on noise serve to protect the community and the neighbourhood against harmful environmental effects due to noise. The technical instructions on noise are incorporated in the Federal Immission Control Act. The sound pressure level is determined in building areas centred 0.5 m in front of the open window of the room in the greatest need of protection. In building areas without rooms in need of protection or in unconstructed areas the sound pressure level is determined at the side most heavily affected, where the construction of a room in need of protection would be permitted in accordance with the building permit.
| 6:00 to 22:00 during the day |
22:00 to 6:00 during the night |
|
| Industrial area | 70 dB(A) | 70 dB(A) |
| Commercial area | 65 dB(A) | 50 dB(A) |
| Central, village, mixed areas | 60 dB(A) | 45 dB(A) |
| Housing and small residential estate areas | 55 dB(A) | 40 dB(A) |
| Purely residential areas | 50 dB(A) | 35 dB(A) |
| Spa areas for hospitals and nursing facilities | 45 dB(A) | 35 dB(A) |
| Source: excerpt from the technical instructions on noise |
The acoustic power level is a sound source specific, distance and direction independent factor that can only be determined by way of calculation. Devices can be compared against one another sonically on the basis of the acoustic power level. (source BWP sound handbook)
Sound pressure is understood in acoustics as the metrologically recordable level that is generated by a sound source at a particular distance. The sound pressure level measured is always subject to the distance to the sound source. (source BWP sound handbook)
The installation of an air heat pump inside the building is another option, involving the quietest installation option. Sound in the house usually spreads across floors and walls. It is necessary to take into account here that when connecting air ducts or pipeline connections a disruption of structure-borne noise is made sure of by the use of a flexible line connection. Potential narrowing flow channels in the air ducts and on the weather protection grate need to be prevented so that annoying flow noises at the air inlets and outlets do not result.
Our x-change dynamic AW I units installed indoors are already equipped with a triple vibration-free compressor. The EPP ventilation ducts can be installed directly without the added installation of a canvas duct connector over the EPP air adapter on the EPP housing.
When installing heat pumps in buildings, so-called “rooms in need of protection” (according to DIN 4109) need to be taken into account.
| Rooms in need of protection | Immission values |
|
| Living space and bedroom | during the day | 35 dB(A) |
| Workrooms / office | during the night | 25 dB(A) |
| Classrooms / seminar rooms | during the night | 25 dB(A) |
| Children's rooms | during the night | 25 dB(A) |
The noise calculator enables the evaluation of noise immissions from air/water pumps with a heat output of a maximum of 35 kW according to the technical instructions on noise in daily operation at times of high sensitivity and during the night.
