Temperature in Attic.
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Temperature in Attic.
08-05-2008 5:26 PM
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Re: Temperature in Attic.
08-05-2008 5:42 PM
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Re: Temperature in Attic.
08-05-2008 6:21 PM
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One worry is that by enclosing the whole lot, you could have problems with much more rapid heat build up if a fan fails for whatever reason.
So long as you can build in some sort of redundancy (multiple fans n+1 is ideal, where n is the number you need to move the volume of air you need to move - remember to power them via your UPS too) and/or resiliance (eg temp monitoring to shut stuff down quickly if it gets too warm - remember how quickly the heat can build up in an enclosed space, so set the thresholds lower than in a vented room on the basis that the temp will still be rising whilst the machines shut down.)
Re: Temperature in Attic.
08-05-2008 6:43 PM
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(Chilly, Ignores the practicality and cost of getting a fridge into the roof. )
Re: Temperature in Attic.
08-05-2008 10:01 PM
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However.... You could work out a system whereby...you have a cabinet (suitably vented) for the servers, with a connecting duct, with fan unit, inside a 12volt car cooler cabinet (cut a hole in the lid of the cooler cabinet, to attach the duct to.... (thing used to keep your beer in for picnics/beach parties) .... Not too big, and probably just enough cool air to reduce the temp of the server cabinet....
Make the server cabinet two or three times the size of servers cubic area , out of Plywood, MDF, and insulate with polystyrene sheets, (various thicknesses available up to about 4 inches, in 8 x 4 sheets) (easy to cut with a serated edge bread knife)
have a small gap at the bottom end s for through flow of air, and your imagination should be able to do the rest....
by making the cabinet 2 or 3 times the size required, will allow more cool air around the servers, and also give room to add another server if needed !
Have fun...
Re: Temperature in Attic.
08-05-2008 10:22 PM
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Re: Temperature in Attic.
08-05-2008 10:28 PM
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Re: Temperature in Attic.
08-05-2008 10:31 PM
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Re: Temperature in Attic.
08-05-2008 10:58 PM
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Have you considered a closed loop water-cooled pipe arrangement with a simple heat exchanger in the cold water tank and similar in a box containing the servers?
This would have the added benefit of providing protection against freezing in winter.
Alternatively, if you have some really green servers you could use a heat-pump arrangement connected into your hot-water tank (there is such a thing as a free bath!).
"In The Beginning Was The Word, And The Word Was Aardvark."
Re: Temperature in Attic.
08-05-2008 11:24 PM
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To do any good you need to supply cold air by refrigeration or from the outside. Maybe some sort of water cooling maybe using a car radiator and fan
Re: Temperature in Attic.
08-05-2008 11:33 PM
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http://www.pclinuxos.com/forum/index.php?topic=44833.0
http://www.overclockers.com/tips1092/
Re: Temperature in Attic.
09-05-2008 4:07 PM
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My 2 servers, UPS, 2 access points, 2 switches, router and cordless phone base unit draw 240 Watts as continously measured by the power meter as pictured (Main computer and laptop also running when photo was taken which is why the meter reads 496 Watts). Based on my A-Level Physics days I would say that the UPS and servers probably output about a tenth the heat of a 1Kw fan heater. If they did output the same as a fan heater I would be using them to heat the house and be struggling to pay my electric bill! LoL.
Quote from: pierre_pierre with that many servers and UPS you have probably got a 1 kw heater at least, I dont think a simple fridge will cope with 30 - 40 Deg ambient (HNC in Heat engineering 40 odd years ago)
Re: Temperature in Attic.
09-05-2008 4:11 PM
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240 watts is 240 watts and 24% of a kilowatt (not 10%).
It all ends up as heat; where else do you think it goes?
(well OK a little escapes as radiation from your wireless transmitters but I think that's milliwatts)
Re: Temperature in Attic.
09-05-2008 5:03 PM
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Re: Temperature in Attic.
09-05-2008 5:39 PM
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From the piccy it looks like there isn't much insulation under the board, which could be a good thing in this case. You could fit insulation under the tiles, held in place with hardboard or builders plastic. You need to leave some ventilation, but the loft space would then be thermally closer to the rest of the house, and more stable.
Failing that, just stick with an extractor fan or two.
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