"Joe Silkinson Spoon" wrote in message
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On Thu, 25 Oct 2018 21:09:51 +0100, Rod Speed
wrote:
"Gym Sulkinson Fork" wrote in message
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On Thu, 25 Oct 2018 17:31:23 +0100, Rod Speed
wrote:
"Gym Sulkinson Fork" wrote in message
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On Thu, 25 Oct 2018 17:09:56 +0100, Rod Speed
wrote:
"Gym Sulkinson Fork" wrote in message
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On Thu, 25 Oct 2018 16:25:20 +0100, Rod Speed
wrote:
Gym Sulkinson Fork wrote
Why are these fitted instead of just a stationary vent like you
see
on
caravans?
They act like a pump.
http://www.flettner.co.uk/van-roof-vents/
I don't see the point in using the wind to power a vent, when the
air
was
already moving.
It isnt from the place you want to move it from.
Surely that's like fitting a generator to your bicycle to power a
motor
to
make you go faster?
Nope, more like using a wind generator to generate
electricity and using the electricity to drive a fan, but
without the losses involved with the electricity
generation and the electrical fan.
But the point is to move air into or out of (shouldn't matter which,
air
still goes through the van) where the vent is.
It does actually, particularly when getting it to
remove the hot air in the roof space in summer.
but if you let the wind blow it in, then it goes out where it's
currently
coming in.
Yes, but is going against the natural flow of the hot air
coming out of the roofspace, so doesn't work as well.
Think of electrically powered exhaust fans.
The work much getter moving the air out of the roofspace
than moving outside air into the the roofspace.
Makes no difference how that fan is powered,
still works better to move the hot air in the
roofspace in the way it wants to go by convection.
I tend to do that when designing desktop computers,
I only bother with the cpu fan, but don't run mine with covers on.
It has been said (but I've never tested it) that you get better cooling of
at least some of the components with the cover on.
Yes you do, but like I said,, the only hot thing in mine is the cpu and
it has its own fan which actually works better with the covers off.
Hard disks for example I can believe it with.
Yes, but like I said, mine don't get hot
even with the room temp is over 30C
Or indeed anything that doesn't have its own fan.
Not with the stuff that isnt in the airflow. Those
run cooler when the hot air off them convects
out of the case that has no covers on.
but mainly because of where the hot chips are and what needs the most
cooling. I have intake fans front bottom cooling the disks,
I don't bother cooling mine but I use the lower speed ones that only get
warm to the touch when the room is over 30C before I turn the air cooler
on.
Never buy the high speed WD drives.
Yeah, I don't, but because the data isnt recoverable if they die.
I choose not backup the PVR files, essentially because I would
need double the storage and its no big deal if they get lost.
I once had a 6 disk array of 1TB WD Caviar blacks. They did have some
cooling, although not a fan blowing directly onto them, and every single
one failed over 2 years.
Yeah, that happened with a mate of mine even with drive cooling.
Must have cost WD a fortune.
Yeah, and only the duopoly ensured that they didn't go broke.
They were uncomfortable to touch for more than a few seconds.
Yeah, I stopped using the highest speed one a couple of
decades ago now. I leave my system on 24/7/365.25 and
don't close apps that I wont be using for days and always
have enough physical ram so the swap file is never used
except at boot time, so I just don't need hard drive speed,
the slowest are fine and they run the coolest.
then across the graphics card,
I'm not into gaming so mine don't even have a fan.
I also use graphics cards for scientific research and bitcoin mining (used
to for that last one - it's not profitable).
Yeah, I never bothered for that reason. Prefer stock market
speculation and made a lot of money from that.
The only game I ever play is Freecell Pro and it isnt exactly demanding
of the video card.
You're odd.
Don't see the point in games and only play freecell pro
when watching videos etc instead of staring at the screen.
then over the CPU then out the top back and/or top.