Heat pumps and noise, all the info

Heat pumps and noise, all the info

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The heat pumps emit noise? Yes, let's see in what cases this noise it can also be audible in the house.

Is the heat pump noisy?
The noise produced by heat pumps it is more or less the same as that generated by other heating systems. In addition, when it comes to noise, between oneheat pump and the other, there are slight differences. There noiseit depends on the type of material used for installation, on the buildings and, in general, on the "sound pressure" level. On the web portals we read that the noise produced by aheat pumpis on average 50 dB, a value comparable to noise produced by a refrigerator. Unless there are acoustic bridges, the pump noise heat is not audible in the house.

Heat pumps and noise

When it comes tonoise of heat pumpswe are dealing with an "intrinsic" sound dictated by the installation and a sound in the air dictated by vibrations and pressure that propagates in the form of a wave. To measure and describe the sound in the air (in our case the noise emitted by the heat pump) different quantities are used in the sound field, the most common are thesound pressure and sound power. The sound pressure is indicated with Pascal, “μPa”, while the sound level is indicated with Decibell, dB. In very practical terms, to understand the difference between these two quantities, you just need to know that in the absence of sounds, 0 dB and 20 μPa can be perceived. Given that the size used on the labels of household appliances is that in dB, also in this article we will focus on the sound level and to help you understand, we will make practical comparisons as previously done with the refrigerator!

Sound level dB, some examples:

  • 10 dB are not audible to the human ear
  • 20 dB can be compared to the ticking of a pocket watch
  • 50 dB produced by a quietly flowing stream
  • 70 dB a passing motorcycle
  • 100 dB the sound level emitted by a horn and measured at a distance of 5 meters.

Why the heat pump produces noise?
Because, like any heating system, it produces vibrations.

When the heat pump is installed indoors
To reduce the production of noise, most heat pumps use (for the connections between the same heat pumps and heating flow / return) elastic flexible pipes resistant to pressure, heat and wear while some manufacturers supply the possibility of laying the heat pump on a particular belt capable of absorbing vibrations.

When the heat pump is installed outside
In this context, soundproofing decoupling is only necessary when the base of theheat pumpis in direct contact with the building. Here too, the flexible pipes simplify the connection of the heat pump to the heating system and at the same time prevent the transmission of vibrations. When theheat pumpis installed outside the home, only rarely (in the case of acoustic bridges), the noise reaches inside the building.

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Video: HVAC Heat Pump Noise Complaint (May 2022).