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From: Paul Fuller
Subject: Re: Fan without blades: should we ROTFL or weep?
Date: 4 Jun 2010 23:09:11
Message: <4c09bfd7@news.povray.org>
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On 4/06/2010 8:14 PM, TC wrote:
> I just did read an add for a "bladeless fan", a so called air-multiplier
> made by Dyson.
>
> When I read the add I clicked on to find out more. Dyson would surely not
> lie to us - so I was really interested in how they build a wonder like this.
>
> Any electric fan, easy to clean, no blades? How is it done? Electromagnetic
> fields? I simply had to see...
>
> Now take a look at this thing and tell me - should I ROTFL or start to weep
> for the poor fools who buy this?
>
> http://www.dyson.com/technology/airmultiplier.asp
>
> Besides: do US laws allow for blatant lies in ads? Bladeless - my ass! And
> easy to clean? I doubt you can clean the real fan-parts at all.
>
>
>
There are a couple of points that make it quite nice.
The air flow is created by a really neat impeller and high power
electric motor. I believe it was adapted from the Dyson 'airblade' hand
dryer. If you have not seen and used one of those you are in for a
surprise! Wow that thing is good.
In regard to dust being accumulated in the impeller, consider that it is
a lot smaller than the blades of a conventional fan but generates a lot
higher speed airflow. Dust simply doesn't have a chance to build up on
the working part. How concerned are you about dust building up on the
impeller of a turbo-charger in a car engine?
Then you might appreciate that the air that goes through the impeller is
filtered. This is used to entrain a larger air mass that doesn't pass
through the impeller. So whatever the final volume of air that is
moved, less goes through the critical part of the Dyson than passes
through the blades of a conventional fan - by more than an order of
magnitude.
Dyson after all does know a bit about air flow and dust.
I guess that dust and fluff would build up on the leading edge of the
annulus. This would however be much easier to clean than on a
conventional fan. Just wipe it. My current desk fan has a wire cage
around the blade. That collects dust and you have to remove the front
part and take the blade out to properly clean it.
The other 'air multiplier' benefits are the quiet operation and steady
airflow.
If they weren't so expensive I'd get one. Still will if I see one on
sale. I do have a Dyson vacuum cleaner and it is so much better than
any other type I have used. A great alternative concept to how the
whole thing should be done, brilliant design, brilliantly engineered
with quality materials. Absolutely the best and not one fault with it
that I can see.
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this is it! I name it the "WTF thread of the day" of yesterday.
And it is a fan and will get dirty, except you quite likely won't be able to
clean it except by getting it to maintenance. Lesson to be learned here:
underneath all shiny and neato things there's always a lot of dirt. :P
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From: Paul Fuller
Subject: Re: Fan without blades: should we ROTFL or weep?
Date: 5 Jun 2010 03:44:55
Message: <4c0a0077@news.povray.org>
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On 5/06/2010 3:39 PM, nemesis wrote:
> this is it! I name it the "WTF thread of the day" of yesterday.
>
> And it is a fan and will get dirty, except you quite likely won't be able to
> clean it except by getting it to maintenance. Lesson to be learned here:
> underneath all shiny and neato things there's always a lot of dirt. :P
>
>
I take that 'WTF' as disagreeing with me.
Your only point that seems specific is that fans get dirty and you imply
that this will be a problem that can only be fixed by maintenance?
Correct me if that isn't what you were saying.
So lets see. I have a Dyson vacuum cleaner. It is used pretty much
once a week to clean a 4 bedroom house with carpets everywhere except
the wet floor areas. I've had it for about 6.5 years.
By its nature there is a large amount of dusty and dirty air being
passed through the device. Number of trips to maintenance thus far is
zero. Apparent loss of functionality due to the inevitable (you say)
buildup of dirt is zero.
We bought it on the recommendation of commercial carpet cleaners who use
uprated models of the same thing. I specifically asked about
reliability and they said they had never had a problem and never had to
do any maintenance on them. That was based on heavy duty use and many
units in the same company.
A traditional fan has large slow moving blades that all of the air that
they move passes through. Around that they have a wire cage covering
both the in and out sides. They are pretty good at collecting dust and
fluff. Very poor at shedding it. In fact the dust that they collect
seems to help collect more.
You shouldn't generalise from there to all fans in all devices.
Especially when they are substantially different and designed by people
who specialise in the field.
Now I can't say that the Dyson fan is equally as good as the model of
Dyson vacuum cleaner that we have. Seems like there isn't the same sort
of problem to justify such an expensive solution. I haven't tried one
to see if it is indeed quieter or better in any way.
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From: Orchid XP v8
Subject: Re: Fan without blades: should we ROTFL or weep?
Date: 5 Jun 2010 03:58:38
Message: <4c0a03ae$1@news.povray.org>
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>> A fan pushes air forwards by using flat blades to fan it. An impeller
>> pushes air *outwards* by centrifugal force. That's an entirely different
>> mode of action. (Although of course impellers aren't exactly new either.)
>
> It is the reverse mode of action.
>
> My computer's power-source has what I would call a fan. In fact, everybody I
> knows calls it this. Yet it impells air into the unit. So should it be named
> impeller?
A fan works by having blades with a uniform cross-section, but angled to
accelerate air parallel to the plane of rotation. If you spin the blades
one way, it blows forwards. If you spin them the other way, it blows
backwards.
An impeller uses centrifugal forces to blow air *outwards* (i.e., away
from the center of rotation - usually meaning that air is sucked into
the impeller through a port near the center and exits the impeller from
the edges). If you spin the impeller the other way, the air still flows
in the same direction.
>> What _is_ new is that by using clever air currents, you can make the draft
>> much bigger with less effort. And I guess it looks kinda neato.
>
> Yes. That's what caugt my eye. It does look good, and at first glance one
> wonders how it is done. Hence my disappointment when I found out. ;-)
I can understand that. ;-)
>> From what little I've seen, fans tend to get dusty when they're not in
>> use, because they're exposed to the air. An impeller, by definition, is
>> internal. When it's not running, there's very little air to get it dusty.
>
> Look into your computer. If it is older than a year, examine the fans. Now,
> that is what I call dirty.
True. Then again, the entire inside of my PC is carpeted in dust; why
not the fans? I guess somebody more qualified than me can explain why
fans get dusty...
>> Still, at the end of the day, if you don't like it, don't buy one. :-)
>
> Have you looked at the price? $329.99 - this is surely innovative. ;-)
Ouch! o_O
OK, definitely don't buy one...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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From: Orchid XP v8
Subject: Re: Fan without blades: should we ROTFL or weep?
Date: 5 Jun 2010 04:07:54
Message: <4c0a05da$1@news.povray.org>
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Paul Fuller wrote:
> The air flow is created by a really neat impeller and high power
> electric motor. I believe it was adapted from the Dyson 'airblade' hand
> dryer. If you have not seen and used one of those you are in for a
> surprise! Wow that thing is good.
We have a Dyson Airblade at work. It is THE most useless thing I've ever
encountered!
When I was a child, it never ceased to amaze me that hand driers
actually work. I mean, sure, it blows hot air on your hands. The
principle makes sense. But surely you're going to have to wait a hell of
a long time before your hands become *dry*, right?
But no, without fail it always manages to dry your hands in seconds. I
mean, *really* dry!
...and then we come to the Dyson Airblade. Now I don't know if this
particular one is just faulty (wouldn't surprise me; everything else in
this building is!), but it is *hopeless*. The air it blows at you is
utterly freezing on your wet hands. It blows so hard that you can
actually see it flobbling your flesh around. And it's deafeningly loud.
I'm not even kidding. I took a sound meter in there and measured the
sound level. The reading came back as 98 dB (A-weighted) or 93 dB
(C-weighted). Apparently that's in the range that's supposed to cause
temporary hearing damage.
And, quite apart from making your hands extremely cold and mashing your
skin around quite unconforably, IT DOESN'T DRY YOUR HANDS! Which, given
that this is the entire purpose for which the device exists, qualifies
it as an unmitigated failure IMHO.
> Dyson after all does know a bit about air flow and dust.
What they definitely know how to do is design products that look
"innovative" and "sciency". Fair play; I couldn't do that.
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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From: Paul Fuller
Subject: Re: Fan without blades: should we ROTFL or weep?
Date: 5 Jun 2010 05:20:58
Message: <4c0a16fa@news.povray.org>
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On 5/06/2010 6:07 PM, Orchid XP v8 wrote:
>
> We have a Dyson Airblade at work. It is THE most useless thing I've ever
> encountered!
>
Strange how our experience can be so different. I was surprised how
fast it was and would say it was the best I've used. No wait to heat
up. No failure to register that my hands were in position. Done in
about 10 seconds. Didn't notice that it was loud although it may well
have been.
>
> What they definitely know how to do is design products that look
> "innovative" and "sciency". Fair play; I couldn't do that.
>
Yes they do that. He should be designing spacecraft for SF book covers
and movies. Still I find (based on the vac) that it is very well made
and works extremely well.
I understand that some of the original patents protecting the Dyson
vacuum cleaner have expired. Now there are lots of cheap knock offs on
the market that emulate the 'bagless' aspect. The couple I've seen up
close looked cheap and frail plus lacked a lot of the nice secondary
features.
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On 05/06/2010 9:07 AM, Orchid XP v8 wrote:
> We have a Dyson Airblade at work. It is THE most useless thing I've ever
> encountered!
hands still wet. On the other hand <groan> the air blades are warm and
--
Best Regards,
Stephen
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From: Orchid XP v8
Subject: Re: Fan without blades: should we ROTFL or weep?
Date: 5 Jun 2010 06:14:11
Message: <4c0a2373@news.povray.org>
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Paul Fuller wrote:
> Strange how our experience can be so different.
Indeed.
> I was surprised how
> fast it was and would say it was the best I've used.
I was surprised too. Usually even cheap hand driers work surprisingly
well. I guess there's just not much to get wrong.
> No failure to register that my hands were in position.
Oh yeah, I forgot about that part... This air blade is sometimes quite
awkward about that. Usually it works, but somethings it point-blank
fails to register that your hands are there (to the point that you have
to just leave with wet hands). And sometimes it stops before you've
removed your hands, and nothing you do will make it start again.
As for the sound... sound meters don't lie. 93 dB isn't quiet. (Gives me
tinnitus every time!)
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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From: Darren New
Subject: Re: Fan without blades: should we ROTFL or weep?
Date: 5 Jun 2010 13:28:05
Message: <4c0a8925@news.povray.org>
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Orchid XP v8 wrote:
> particular one is just faulty (wouldn't surprise me; everything else in
> this building is!), but it is *hopeless*.
I think it's just yours. Or you're doing it wrong, either way.
--
Darren New, San Diego CA, USA (PST)
Eiffel - The language that lets you specify exactly
that the code does what you think it does, even if
it doesn't do what you wanted.
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From: Jim Henderson
Subject: Re: Fan without blades: should we ROTFL or weep?
Date: 5 Jun 2010 16:11:07
Message: <4c0aaf5b@news.povray.org>
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On Sat, 05 Jun 2010 10:28:01 -0700, Darren New wrote:
> Orchid XP v8 wrote:
>> particular one is just faulty (wouldn't surprise me; everything else in
>> this building is!), but it is *hopeless*.
>
> I think it's just yours. Or you're doing it wrong, either way.
I've found them to be pretty effective - they installed those things in
the restrooms at the local CostCo. I'd never seen one before, but it got
the job done (at least well enough). :-)
Jim
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