How to Run a Computer in a Sub-Zero Environment? 152
Underdog asks: "I've seen tons of Slashdot articles on cooling hardware, but my company may be taking on the task of wiring a large sub-zero (as low as -14) warehouse with temperature sensors and the requisite network equipment and computers to read them. Our initial proposal includes at least a dozen acquisition computers, hung from the racks in the freezer. Does anyone have any experience with installing computers in extremely low temperature locations?"
Heat it (Score:2, Interesting)
Mac G4 (Score:5, Interesting)
Sorry about spelling and grammer
Liquid Cooling/Heating (Score:2, Interesting)
Good luck.
Toughbooks (Score:3, Interesting)
http://www.panasonic.com/business/toughbook/df_te
Though that is only part of the solution...
A Chicken Will Do (Score:5, Interesting)
Re:Mac G4 (Score:2, Interesting)
Re:Just an idea... (Score:3, Interesting)
Re:Condensation shouldn't be a problem (Score:3, Interesting)
No. For the sake of making up numbers, lets say the cold air can hold 50g of water per cubic meter and that the relative humidity of the cold air is 75%. This means that the air is actually holding 75% of 50g, or 37.5g of water per cubic meter. Condensation will occure when the air can no longer hold any water, so we have a ways to go before reaching 100% humidity.
Now the air is warmed in the processor so much that it is capable of hold 100g of water per cubic meter. It's still holding 37.5g of water because there is no where for new water to come from. This means that the relative humidity is now 37.5%. We are much farther from condensing that we were before.
Water would only condense on the ram if the ram were so cold that the air immediately next to it were cold enough to lower the capacity enough that water must condense. This won't happen unless the ram is COLDER than the ambient air, like a waterblock/peltier combination or a cold pop can. The pop can is colder than the ambient temperature so the air immdeiately next to the can is cooled enough to lower it's capacity (and thus increase it's humidity) until condensation occurs.
Just make sure that your computer parts are warmer than the air inside the freezer and you'll be fine.
Re:Lenny's Mac G4 (Score:2, Interesting)
Use a data logger (Score:1, Interesting)
These things are great for weather stations, and have all the electronics for measuring temperature, among other things. They are a bit expensive, and not very fancy, but still great and indistructable.
You could also get a bunch of sheilded low-voltage pair cable, and make a 107 temperature probe ( http://www.campbellsci.ca/Catalogue/107.html [campbellsci.ca] see manual for electronics) from a bunch of high-quality resisters ordered elsewhere, and do the half-bridge resistance measurement outside of the cooled warehouse, but measure the end of the probe.
Re:In addition ... (Score:4, Interesting)