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Thread: Extreme Cold

  1. #21
    FLAC Machinehead's Avatar
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    Quote Originally Posted by sergatiuk View Post
    and therefore in the summer when its +40C, how amazingly inside the wool its gonna be cooler ...
    Logically this doesn't make sense. While I agree that wool will retain the thermal temperature of a hard drive which would be pretty useful in cold weather, in the summer the insulation will cause overheating since the the device it self is a heat generator. Not to mention will make it more difficult to cool the hard drive down.

  2. #22
    Constant Bitrate sergatiuk's Avatar
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    again, you are missing my point... the idea is not to isolate the HDD but the whole PC case, this way the fans regulate the temperature inside the case...

  3. #23
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    I don't think so man, if you've got fans in the case pushing around hot air, they're not going to be able to cool down the system in the summer time unless they're getting cooler air from outside the case. The wool will inhibit this.
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  4. #24
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    Well if you have fans circulating ambient air from the outside that is at a lower temperature than inside the case, then perhaps it wont overheat in the summer.

    But the whole point of this is to prevent the hard drive from freezing in the winter. It might work if you are only leaving the computer for a few hours at a time, but overnight in -50C? It wont work, regardless of if you are wrapping the whole computer or just the hard drive. You can leave boiling water inside a thermos out in -50C overnight and the next morning it will still be frozen. Not worth the trouble since you can just get a cheap SSD for $100.

  5. #25
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    With an extra dry or gel batterie (min 72 ah) in trunk, energy saver carpc the problem will be solved!! But the thing is: do you really want to spend that money on this!

    The first and the second battery will be isolated with isolator. By that when you turn off the car the isolator will cutout the link between the engine batt and the system batt. So your engine batt will not die. You actually can make a system which will shutdown and open the system with periods, if the weather inside the car is lower than -10. Actually you can make a proffessional controller which will set the periods accourding to how the weather is bad. For example it won't open when heat > -10. it will open and remain on for 10 minutes in every 40 minutes when heat < -10. Then you can set another option for -20, -30, -40 if you need!

    Yeah it is an extreme solution; but if you have a powerfull sound system extra batterie is also good for the system, especially in extreme cold weathers!
    ------------------------------------------------------------------------------------------
    Or another option: if the only problem is hdd, you can isolate your case or hdd with heat isolator components (simplest: wool or more proffesional). But as you said only that can not do the trick. So again with a thermostat you can stick several resistors to hdd. When the heat gets lower the thermostat will close the circuit and resistors will heat up the hdd... this option will not need an extra battery. 0.5 ampere an hour will more than enough to heat the hdd. So in 24 hours it will be consuming 12 amperes. If you have 72 ah battery and an avarage alternator and if you are not using your car in very short trips, I think this can do the trick!

  6. #26
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    We rarely get to close to -40 but the ee25 worked fine all winter for me. I also have a portable usb hd for media that is easily undocked if I'm leaving the car for an extended period, like for work. A SS drive for your OS and applications plus a regular portable USB drive seems like the best solution to me.
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  7. #27
    Raw Wave
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    This really needs a thermal sensor that inhibits low-temp operation, or a keep warm (standby or pre-heat) device - no different to normal car etc operating principles.

    Insulation merely slows down heat transfer (from hot to cold) - it doesn't generate heat.
    Keep in mind that wool is like most fibres - it is the air that is the insulator (coupled with with low conduction fibres).
    And yes, wool is fire retardant and great fire protection - ask fire-fighters, or check out fire blankets (for survival kits, not kitchen fires).

  8. #28
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    loving this thread. i have rockwool and wood aplenty here, and have a mind to build it, but im wondering, surely the holes for the fans are gonna cancel out all that insulation?

  9. #29
    Variable Bitrate Wayne613's Avatar
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    Quote Originally Posted by Redd View Post
    loving this thread. i have rockwool and wood aplenty here, and have a mind to build it, but im wondering, surely the holes for the fans are gonna cancel out all that insulation?
    I think it would likely hold a higher than outside temp infinitely longer so long as the metal it was connected to (the case) was not given significant surface area to transfer heat back. With the fans inactive at shut-down, and the rest covered...*shrug* Cant exactly say I would know, the whole case-in-a-blanket thing is not on my normal to-do list.

    Wont the case get itchy though?

    Thankfully it doesńt usually make it below 15F here. Itś gone lower before, but very infrequent. Even at just freezing and slightly below my lilliput is more sluggish than the average post office line.
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  10. #30
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    cheers. forgive my ineptitude, but that brings up another question. to use the wood as a baseplate or keep the metal?

    i never took on any science subjects! wish i had now. metals gonna be better as a heatsink but damn it gets cold

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