The environmental protection limits are completely inadequate in this area. A limit of dB A weighted at the nearest residential boundary is common in Australia (hence the above questions about the specific zoning).I agree. Over here low frequency noise pollution is getting more attention fortunately.Off topic, but yet the Dutch government is working on laws to only allow hybrid central heating systems as a replacement from 2026 onward. Most of these systems use air to water heat pumps, which make noise. Imagine a "nice" vinex location or a town like Amsterdam with all the houses fitted with such units what a noise level that might bring.
Edit: It might be read as that every body had to get a new central heating system, so added "as a replacement". Only when you need a new one you have to install a hybrid.More uninformed/irrational heat pump scare mongering! Australia has limits on domestic appliance noise, 45 dB(A weighted) at the boundary. With plenty of installs being built right on the boundary the majority of new heat pumps meet the requirements so its not even an extra cost. There are legacy heaters gas/oil/heat-pump that fail that limit too, but since the rules only apply to new installations they get away with it.
The environmental protection limits are completely inadequate in this area. A limit of dB A weighted at the nearest residential boundary is common in Australia (hence the above questions about the specific zoning).I agree. Over here low frequency noise pollution is getting more attention fortunately.Off topic, but yet the Dutch government is working on laws to only allow hybrid central heating systems as a replacement from 2026 onward. Most of these systems use air to water heat pumps, which make noise. Imagine a "nice" vinex location or a town like Amsterdam with all the houses fitted with such units what a noise level that might bring.
Edit: It might be read as that every body had to get a new central heating system, so added "as a replacement". Only when you need a new one you have to install a hybrid.More uninformed/irrational heat pump scare mongering! Australia has limits on domestic appliance noise, 45 dB(A weighted) at the boundary. With plenty of installs being built right on the boundary the majority of new heat pumps meet the requirements so its not even an extra cost. There are legacy heaters gas/oil/heat-pump that fail that limit too, but since the rules only apply to new installations they get away with it.45dB(A) is rather loud especially if you want to sleep with the windows open. And as I wrote before: measuring in dB(A) is horribly wrong because it won't account for low frequency noise.
The environmental protection limits are completely inadequate in this area. A limit of dB A weighted at the nearest residential boundary is common in Australia (hence the above questions about the specific zoning).I agree. Over here low frequency noise pollution is getting more attention fortunately.Off topic, but yet the Dutch government is working on laws to only allow hybrid central heating systems as a replacement from 2026 onward. Most of these systems use air to water heat pumps, which make noise. Imagine a "nice" vinex location or a town like Amsterdam with all the houses fitted with such units what a noise level that might bring.
Edit: It might be read as that every body had to get a new central heating system, so added "as a replacement". Only when you need a new one you have to install a hybrid.More uninformed/irrational heat pump scare mongering! Australia has limits on domestic appliance noise, 45 dB(A weighted) at the boundary. With plenty of installs being built right on the boundary the majority of new heat pumps meet the requirements so its not even an extra cost. There are legacy heaters gas/oil/heat-pump that fail that limit too, but since the rules only apply to new installations they get away with it.45dB(A) is rather loud especially if you want to sleep with the windows open. And as I wrote before: measuring in dB(A) is horribly wrong because it won't account for low frequency noise.
The environmental protection limits are completely inadequate in this area. A limit of dB A weighted at the nearest residential boundary is common in Australia (hence the above questions about the specific zoning).I agree. Over here low frequency noise pollution is getting more attention fortunately.Off topic, but yet the Dutch government is working on laws to only allow hybrid central heating systems as a replacement from 2026 onward. Most of these systems use air to water heat pumps, which make noise. Imagine a "nice" vinex location or a town like Amsterdam with all the houses fitted with such units what a noise level that might bring.
Edit: It might be read as that every body had to get a new central heating system, so added "as a replacement". Only when you need a new one you have to install a hybrid.More uninformed/irrational heat pump scare mongering! Australia has limits on domestic appliance noise, 45 dB(A weighted) at the boundary. With plenty of installs being built right on the boundary the majority of new heat pumps meet the requirements so its not even an extra cost. There are legacy heaters gas/oil/heat-pump that fail that limit too, but since the rules only apply to new installations they get away with it.45dB(A) is rather loud especially if you want to sleep with the windows open. And as I wrote before: measuring in dB(A) is horribly wrong because it won't account for low frequency noise.
A neighbor of ours has a unit outside his house, and only when we walk by I can hear it, but this is 170M away from our house, so no biggie, but hang multiple of these units of building walls and who knows what resonance pattern comes to life.
Resonance is a bitch. When I still lived in the Netherlands it was in a rural village but across the road from our house was Nunhem zaden (now BASF) and they build a power house at some point. I started to hear the hum of it in our house and complained about it. They were very helpful and installed a special filter in the chimney of the power house, which solved the problem. During the time it caused us hinder I could hear it louder at certain points in the house due to resonance.
And there in lies the difference, some people are sensitive to even the smallest sound, and others can sleep with a busy highway nearby.
Most big cities in hot parts of the world have air con for apartments and houses, and besides faulty units I've never thought they were all that loud while running.
Could not sleep due to the air-conditioning units on the roof. There was no quit spot in the room to be found.
Most big cities in hot parts of the world have air con for apartments and houses, and besides faulty units I've never thought they were all that loud while running.
That's not my experience.Could not sleep due to the air-conditioning units on the roof. There was no quit spot in the room to be found.This.
In hotel rooms that have one of those window mounted or wall mounted aircon units, they are usually so noisy that I cannot sleep with them running. I have a choice of a cool room with too much noise, or a quiet room that is too hot. My usual strategy is to run the thing at max all evening, then turn it off before sleeping.
Hello,
Your replies where helpful to bring me back to the "sound aspect" problem.
Requesting help from a specialist in EMI and its derivatives, I've been led to the problem of Infrasounds generated by harmonics inducted by high power + high frequencies (moderated since in 90kHz range) at a low frequency range on unshielded city grid cables.
Err, how do the city power cable induce low frequency sound? What is the physical mechanism?
Sorry to tell you, but it sounds like you have been peddled some BS
That's what I thought... Also, where is the 90 kHz carrier supposed to come from
the bakery's ovens
Hello,
Your replies where helpful to bring me back to the "sound aspect" problem.
Requesting help from a specialist in EMI and its derivatives, I've been led to the problem of Infrasounds generated by harmonics inducted by high power + high frequencies (moderated since in 90kHz range) at a low frequency range on unshielded city grid cables.
Err, how do the city power cable induce low frequency sound? What is the physical mechanism?
Sorry to tell you, but it sounds like you have been peddled some BS
QuoteThat's what I thought... Also, where is the 90 kHz carrier supposed to come fromhttp://scent-itn.org/emi_cenelec_freq.html
A last note, there is a bloom in France of people being hardly hit by infrasounds, on the whole territory. Which ignited 2 years ago my curiosity.
QuoteThat's what I thought... Also, where is the 90 kHz carrier supposed to come fromhttp://scent-itn.org/emi_cenelec_freq.html
Yes, power line communication is a thing. But those signals are not "high power". Even in the presence of non-linear effects, which could in principle generate sub-harmonics, I struggle very much to see how they could induce noticeable audible or sub-sonic frequencies.
You are barking up the wrong tree. The multiple earlier posts which were encouraging you to look into low-frequency vibrations, were trying to lead your thinking away from the EMI you were so concerned about. We were talking about the possibility of purely mechanical vibrations introduced from the bakery. You somehow managed to connect this back to your favorite concerns about EMI again, which I think is misleading you.
Hello,
Your replies where helpful to bring me back to the "sound aspect" problem.
Requesting help from a specialist in EMI and its derivatives, I've been led to the problem of Infrasounds generated by harmonics inducted by high power + high frequencies (moderated since in 90kHz range) at a low frequency range on unshielded city grid cables.
Err, how do the city power cable induce low frequency sound? What is the physical mechanism?
Sorry to tell you, but it sounds like you have been peddled some BS
or you are very very sensitive.
Hello,
Your replies where helpful to bring me back to the "sound aspect" problem.
Requesting help from a specialist in EMI and its derivatives, I've been led to the problem of Infrasounds generated by harmonics inducted by high power + high frequencies (moderated since in 90kHz range) at a low frequency range on unshielded city grid cables.
Err, how do the city power cable induce low frequency sound? What is the physical mechanism?
Sorry to tell you, but it sounds like you have been peddled some BSPass enough current through a cable and it will start to move due to the magnetic field. Lookup some videos about arc melting furnaces. You can see the cables dance around. The same can be seen from cables going to spot welders. Heck, I even managed to make test leads move on my desk by discharging a capacitor bank causing a 1kA current spike. All in all it is possible that cables move or vibrate.
I will spend more bucks, hiring such dedicated experts in noise measures. I'll keep you informed in the following months if curious about my case.