|
Posted to uk.d-i-y
|
|
|
older/newer GCH radiator efficiency?
On 24/06/2020 22:45, wrote:
On Wednesday, 24 June 2020 01:25:52 UTC+1, John Rumm wrote:
On 23/06/2020 20:41, tabbypurr wrote:
On Tuesday, 23 June 2020 14:24:11 UTC+1, RJH wrote:
On 22 Jun 2020 at 17:29:59 BST, "tabbypurr wrote:
If an engineer isn't able to design a silent fan they had better stay out
of that business.
Moving any volume of air around inherently creates noise. An engineer
would know this, otherwise they best stay out of that business.
I take it you're not an engineer then. Or an ignorant one.
Hint: try turning a desktop fan round by finger & see how noisy it is. No
wind noise.
Oh well yes, even I could do that. Doesn't make me (or you) an engineer. Or
the room meaningfully warmer.
It makes the point that fans can be silent.
Perhaps very quite and mostly useless would be closer to the truth.
wrong again
Yes big slower fans are quieter than smaller faster ones for the same
air flow, but none are silent.
wrong again
If you are shifting a volume of air, you
will get noise from that even without the fan... Ever heard the wind blow?
noise ceases to occur when airspeed is low. And obviously most fans are not noise optimised. Even my first 1k rpm fan was completely silent.
You keep using "silent" without defining what you mean. So I suspect
you are through the looking glass and playing Humpty Dumpty. Meanwhile
the rest of us in the world where "completely silent" requires the
absence of any acoustic waves - whether or not you can hear them with
your particular ears at whatever distance you are listening. Good luck
achieving that with a fan. And even if you define "silent" by reference
to your ear at your distance, don't attach "completely" until you've
checked what happens if you run 1,000 of the fans in the room at the
same time.
--
Robin
reply-to address is (intended to be) valid
|