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Structure-borne noise decoupling is only necessary if the foundation of the heat pump is in direct contact with the building. Flexible hoses make it easier to connect the heat pump to the heating system and at the same time prevent possible transmission of vibrations.
In addition, most heat pumps installed outside also have a vibration-decoupled compressor base plate, as already described for the units installed inside. When installing heat pumps outdoors, the sound propagation must be taken into account. It should be avoided that the sound emissions are reflected on walls.
Blowing directly onto house walls etc. should also be avoided, as this can lead to an increase in the sound pressure level. The propagation of sound can be reduced by structural obstacles. The outlet side should be aligned towards the street if possible.
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NOTE The air flow from air / water heat pumps installed outside must not be obstructed on any side. |
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With the help of the tables, the directed sound pressure level of the air / water heat pumps can be read off. The values at a distance of 1 m are actually measured values. The values at a distance of 5 and 10 m are calculated using a hemispherical spread in the free field. In practice, deviations caused by sound reflection or sound absorption due to local conditions are possible. As can be seen from the values in the table, an air / water heat pump has the highest noise emissions in the discharge direction, followed by the suction side. Significantly lower emission levels occur on the sides.
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NOTE For heat pumps installed outside, the directional sound pressure levels are decisive. |
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If emissions from heat pumps are to be determined or calculated in advance, the use of the BWP sound calculator has established itself in the industry. Experience shows that the results are accepted by all authorities.
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Fig.5.9: Sound calculation according to BWP sound calculator