ᐅ Sound barrier wall for neighbor’s heat pump

thelastscout85 schrieb:
Are higher-powered devices generally quieter compared to "weaker" ones, since in theory they don’t have to run at full speed?

That’s how theories usually work.

I have a few of my own: noise level isn’t really “absolute,” but rather “perceived,” which is why measurements like “dB(A)” exist—frequency-dependent.

In theory, the frequency of airflow from rotating parts (such as fans) relates to their diameter, while the sound level mainly depends on the rotational speed.

In practice, what usually bothers people more is how “unevenly” a device runs. Unevenness affects noise in two ways: first, fluctuating speed (which modulates pitch); second, irregularity in shape, like an elliptical rather than a perfect circle. This comes from manufacturing tolerances, shaft alignment, wear (or oversized clearances) in bearings, etc.

In other words, cheap stuff can be significantly louder and more annoying than a device of the same type, even if the latter has “more power.”

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@11ant

Great community theory.

The costs are shared... But who pays if one of the parties cannot (or refuses to) pay? The other party becomes jointly and severally liable for everything? Great idea. Not at all.

toxicmolotow schrieb:
@11ant
Great theory of community.

Not theory at all. Next year, we will celebrate the 200th anniversary of the community practitioner Friedrich Wilhelm Raiffeisen.

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Yes, exactly, and the setup costs for a housing cooperative start at around 1500 euros, with ongoing fees of 200 euros per year, which certainly pays off, just like the inspection fees of 800 euros every two years.

This makes the heating system a bargain with fixed costs of 600 euros per semi-detached house.

Oh wait... it actually doesn’t work that way. Because you need at least 7 members to establish the cooperative.

And again the question: liability? Well, limited to the investment... and the value of the heating system. Probably great if it gets seized.

And yes, I know there are concepts like district heating or combined heat and power systems, but that’s not a solution for a single semi-detached house.

toxicmolotow schrieb:
Yes, exactly, and the founding costs of a cooperative society (eG) start at around 1500 euros, and the annual fees of 200 euros certainly pay off, just like the inspection fees of 800 euros every two years.

I was neither referring to a cooperative society nor suggesting to apply that model to a duplex—you are mixing several things.

My suggestions were: to team up with about half a dozen neighbors to jointly plan and use energy systems; to start with a duplex by avoiding each party doing their own small-scale setup; and, for example, to use an unregistered association. I mentioned Raiffeisen explicitly as a practical example—not to recommend the cooperative society as a legal form.

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Caspar2020 schrieb:
@Nordlys also chose gas because it is the cheapest way for him to heat the house.

Good for him; but from a socio-political perspective, it is not really the right approach for successfully implementing the energy transition.

Unfortunately, you did not inform yourself properly. The storage issue is still one of the unsolved puzzles of the energy transition, and the currently assumed solution is most likely that the gas network will serve as the winter energy storage.

Gas is not the same as natural gas. Gas can be produced artificially or biologically.

A gas heating system installed today could still be in use in 50 years (well, renewed once or twice) burning biogas, so-called wind gas, or other gases. At that point, it would no longer have anything to do with fossil fuels.

There are already 100%-biogas tariffs available for just under 10 cents per kWh. This is the current state of technology, and this price will decrease in 10 or 20 years once it becomes more widely used. Even at 10 cents per kWh, one could operate 100% without fossil fuels and continue using gas heating.

In the future, biogas, wind gas, and similar gases naturally need to become cheaper than natural gas, which will then automatically be phased out without a system change. Another gas will simply be injected into what is essentially Germany's almost unlimited gas/gas storage network. This gas network and its reserves are probably by far the largest energy storage systems worldwide. They can be converted from fossil to completely non-fossil sources easily and gradually.