The hot weather has made me look for a cooling fan. I thought a
pedestal fan would be quieter than a tower fan but this site says the
"Noise can also be a factor. In this category, tower fans win hands
Is he right?
I think it can depend on makes and models.
For the least amount of noise, intrusion and the best effect in use I
think the ceiling fans take a lot of beating. We have one in the
lounge and one in our bedroom and it can feel very oppressive if we go
somewhere where there isn't such a thing.
For low noise and a good (noticeable) air flow you need a big fan
turning slowly or the fan somewhere else and ducting taking the air
where you want it.
If you are using a conventional floor / table mounted fan I would tend
to try to get air circulating within a (smaller / square) room and so
position the fan to blow along one wall, rather than have it
oscillating around the middle.
OOI we have a split unit aircon in the middle bedroom and have
experimented with screening off the landing from the rest of the house
(polythene sheet on a batten) and leaving all 3 bedroom doors ajar and
on the hottest of nights waking up to a chilly 20 degrees. The
realisation of how warm it may have been otherwise was when you walked
though the 'curtain' into the heat of the rest of the house! ;-(
Maybe with all this global warming we (in the UK) might start to
consider the routine fitment of housewide coverage of aircon (as we do
heating) and then at least there would be some direct justification
for also having solar panels. ;-)
Cheers, T i m
That's what is universally used in the hotter parts of the world
where aircon is to expensive to buy or run. A big slow ceiling fan
just enough to get the air slowly moving makes a huge difference to
the comfort of a room and is barel audible.
The standard 8' ceiling height of a UK house means that a ceiling fan
may well have to rather to close to the ceiling but it'll still be
better than the draft from a convential relatively high speed
Or just have a house with high thermal mass, was well above 25 C
outside yesterday, the didn't get much above 20 C.
On Wed, 20 Jul 2016 13:54:59 +0100 (BST), "Dave Liquorice"
True. You often see them in films etc. ;-)
Yup. Even going round mums with her large rooms it still feels
'stifling' (to us) unless you open a window or dig a fan out.
the way. I think the upstairs ceiling is a bit lower and the fan is
over the bed so you do need to remember it's on when ... well ...
Does that also work (as well) in the winter Dave? We are EOT and the
flank wall is exposed to the sun for the second half of the day. That
means if there is any sun about it acts a bit like a large storage
rad, keeping the house warm in the evenings. Not sure how much hotter
it makes the house in the summer but at least you can easily let that
heat *out*. ;-)
Cheers, T i m
On Wed, 20 Jul 2016 12:42:31 -0700 (PDT), firstname.lastname@example.org
Yes, that as well! ;-)
Cheers, T i m
p.s. A mate had a bit of bad luck with one particular girlfriend.
First she wrapped his car round a tree, breaking his left arm in
several places, then after that healed, broke his nose with a headbut
when they were at it. ;-)
Straight after the first event she was embarrassed at the Police
Station when the policeman was going though the stuff recovered from
the car and asked if the 'toy' was hers (it was) and later when it
went off in her bag when she was back at his (very straight-laced /
religious) parents house, all being somber because of what happened.
Probably not as noticeable in the winter as the heating will be on so
one expects to come in from -5 C or lower and be warm. In summer with
it 25+ C outside coming in is pleasantly cools.
What the approximately 20 tonnes of stone through the middle of the
house does do is slow down any changes in internal temperature. What
you don't do is ever turn the heating off, always have it on a
thermostat. 'Cause if that 20 tonnes cools down by a few degrees
because you went way for a few days and turned the heating off it
takes a long time (days) for the place to become comfortable again.
I hadn't thought of using a ceiling fan but it seems like a good
idea especially its slow moving quieter operation.
I will also get a floor fan but am not sure which type tends to be
quietest. I already have a good pedestal fan which is quiet and a
cheap Tesco tower fan which is noisy. But the article I quoted
suggests tower fans should be quieter so I'm not sure what to get
and I can't manage to hear the thing first.
If you can afford it, get a DC ceiling fan. They are silent in
operation. I've yet to find an AC ceiling fan which doesn't hum like mad
- and it seems worse at the slowest speed (where the noise of the blades
moving air is least) because it becomes so obvious. And if they have
lights, the glass shades just add to the noise as it seems they vibrate
at just the right frequency to add to the noise.
More info here:
The sales page on that site has fans costing from ?350 to ?900 which
is beyond my price range.
Is the hum you mention inherent in all AC fans? I recall having a
ceiling fan in a bedroom them in America without noticing any hum.
Perhaps there are good designs without any hum problems?
I have a Fantasia Tau 50" in the conservatory. It has 6 forward & 6
reverse speeds. In winter I use it at the lowest reverse speed to just
keep the air circulating. In summer, even at full speed, it is only the
air movement I hear, never the motor.
I have been in quite a few US motels/hotels with ceiling fans and can't
remember any which didn't hum. I sometimes wonder if it's because they
are mounted on the ceiling, and that somehow acts as a sounding board.
Ordinary floor or pedestal fans never seem to hum.
Of the two we have the one we are most likely to hear humming,
especially on the lowest speed (as Jeff mentions) is the bedroom one
and in spite of my Tinnitus I still have pretty good hearing. I will
agree there is, or as you say, *can* hum slightly but that can also be
more of a buzz, caused by something in the fitting rather than the
motor itself / directly. By that I mean it can be the glass bowl or
the lamp in the fitting resonating to the mechanical vibration caused
by the motor acting as a transformer.
With a bit of tweaking, those noises can normally be silenced (putting
thicker rubber band around the glass lamp bowl under the 3 flange
screws or pinching the metal lamp holder in slightly).
Cheers, T i m
I agree with you, but wonder why those motors hum/vibrate. If there was
no hum, the mounting wouldn't be critical. I guess one issue is that we
have very little to compare fan motors with. Usually, with an AC motor
there is quite a bit of associated noise (drill, vacuum cleaner, etc)
which drowns out any hum. When my electric mower jammed recently, that
made a really loud hum which I'd never noticed before. What low-power
(100W or so) mains motors are there other than fans where you might be
able to compare the hum levels?
The DC fans have a SMPS, so any "hum" would be above the upper hearing
frequency. Mind you, that raises another problem - mine produced a large
amount of RFI! Fortunately, being in the conservatory the aluminium
frame helped keep it under down. I also fitted a suppressor to the mains
leads near the SMPS and that worked well too.
BTDT. But they always seemed to work loose after a while.
Ceiling fans have been around for over a 100 years; you'd have thought
they'd have sorted these problems out by now!
AC ceiling fans use shaded pole motors, these produce pulsed
propulsion, which is damped by the weight of the fan blade and air
resistance. If the blade is not balanced, you will get vibration. Most
other appliances use brush motors which are inherently noisier due to
higher rotor speeds and commutator roughness. Some lawnmowers use
induction motors where the hum is only audible when the rotor is
stalled. All consumer motors suffer from being designed down to a price.
I have a fan heater which is 60 years old and still running. This is
because the sintered motor bearing design was engineered to accept the
fan shaft lateral loading. Modern units have inadequate bearings, so
clap out after a few years. If it lasts 2 years, that's good enough to
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