General > General Technical Chat
US Ceiling Fan Efficiency Rule Proposal
Zero999:
--- Quote from: coppice on September 04, 2023, 08:59:38 pm ---
--- Quote from: Zero999 on September 04, 2023, 08:11:59 pm ---
--- Quote from: coppice on September 04, 2023, 01:43:07 pm ---
--- Quote from: Zero999 on September 04, 2023, 01:30:36 pm ---I can't say I've ever noticed any whine from a BLDC motor, even when I was much younger and could hear over 20kHz.
--- End quote ---
Really? There are huge numbers of BLDC motors which make considerable noise at quite low frequencies, presumably a beating sub-multiple of the switching frequency.
--- End quote ---
Yes, the noise predominately comes from the blades cutting through the air.
--- End quote ---
Please try to make sense. Reading comments before responding might help. Where did I mention blades? The subject was motors, not their specific use in fans.
--- End quote ---
I've yet to encounter a fan who's motor is louder, than the air. Occasionally there might be a slight hum from the motor, but it's nothing compared to the wind.
coppice:
--- Quote from: Zero999 on September 04, 2023, 09:09:59 pm ---
--- Quote from: coppice on September 04, 2023, 08:59:38 pm ---
--- Quote from: Zero999 on September 04, 2023, 08:11:59 pm ---
--- Quote from: coppice on September 04, 2023, 01:43:07 pm ---
--- Quote from: Zero999 on September 04, 2023, 01:30:36 pm ---I can't say I've ever noticed any whine from a BLDC motor, even when I was much younger and could hear over 20kHz.
--- End quote ---
Really? There are huge numbers of BLDC motors which make considerable noise at quite low frequencies, presumably a beating sub-multiple of the switching frequency.
--- End quote ---
Yes, the noise predominately comes from the blades cutting through the air.
--- End quote ---
Please try to make sense. Reading comments before responding might help. Where did I mention blades? The subject was motors, not their specific use in fans.
--- End quote ---
I've yet to encounter a fan who's motor is louder, than the air. Occasionally there might be a slight hum from the motor, but it's nothing compared to the wind.
--- End quote ---
You need to get out more. With big ceiling fans that don't generally spin very fast, as the huge blades move lots of air at low speed, the motor can be VERY annoying and you just don't hear the air being moved.
Veteran68:
Maybe it's my hearing but I don't believe I've EVER heard air moving from a ceiling fan, even on high speed. Certainly not on low or medium speeds, which is where ours tend to stay. We sleep under a ceiling fan that runs 24/7/365, even in winter. I don't hear anything.
In our last house our bedroom ceiling fan motor could be heard at higher speeds, it was clearly motor hum/whine and not wind noise. But it's a >25 year old design, installed when the house was built in 1998. Our current house was built in 2021 which we bought as new construction, I have no idea what type of fan it is. Pretty sure it was a Home Depot special, nothing fancy.
SiliconWizard:
--- Quote from: coppice on September 04, 2023, 09:23:34 pm ---
--- Quote from: Zero999 on September 04, 2023, 09:09:59 pm ---I've yet to encounter a fan who's motor is louder, than the air. Occasionally there might be a slight hum from the motor, but it's nothing compared to the wind.
--- End quote ---
You need to get out more.
--- End quote ---
Although, he's not very likely to encounter ceiling fans outdoors.
tszaboo:
--- Quote from: Dacian on September 04, 2023, 09:06:05 pm ---
--- Quote from: tszaboo on September 04, 2023, 12:33:38 pm ---TBH I saw a few American Youtuber do solar installation, and they always go with ridiculous numbers.
"I'm paying 10 cents a KWh and my monthly bill is 1500 USD" or something like that. And then they install a 100.000 dollar solar installation with enough batteries to run a small European city.
So yeah. You could use more regulations on the efficiency, especially on HVAC.
--- End quote ---
Is that a typo or is your monthly bill 1500USD ?At $0.1/kWh that means 15MWH per month.
--- End quote ---
Mine? No, I am not an American.
But here is a guy who was using apparently 54 MWh of electricity in a year. And I see more and more of these ridiculous numbers.
https://youtu.be/UJeSWbR6W04?si=pG-uF2NdsVYQxxK6
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