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| Thread ID: 145919 | 2018-03-03 06:53:00 | Compressed Air Can Sprays are very dear | Digby (677) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 1446988 | 2018-03-07 20:33:00 | .....snip One little picky point I can't let go, the "air" in the can is not cold - it's at the same ambient temperature as everything around it. When it expands it absorbs heat energy from everything it touches and that has a cooling effect, but the "air" itself is not cold. I'm going to be picky too :) Of course the gas gets colder. If it was a perfect gas and true adiabatic expansion there would be no temperature drop. However the gas is expanding through a nozzle, and you get the Joule -Thompson cooling effect, the basis for refrigeration and liquefaction of gases. Neither is the gas "perfect, so there will be an additional cooling effect. The gas absorbs heat from what it touches and the surroundings because it is at lower temperature QED. |
Terry Porritt (14) | ||
| 1446989 | 2018-03-07 20:40:00 | I am sure sucking the dust away with a vacuum cleaner is infinitely superior to blowing dust all over the place and it being forced into nooks and crannies, even into fan bearings, or back into the room to be drawn in again by the fans :clap . actually no. :-) if the PC is really dusty , you need compressed air (from air compressor) to get all the dust out . Vacuum cleaner does a half arsed job, but is good enough most of the time. the cans arnt much good on really dusty PC's. You just need to be carefull using compressed air from a compressor , dont blow into the fans , or hold the fan to stop it spinning if no other way. Compressed air gets the dust out of nooks & crannies, vac cleaners leave it in there Also, there is no other (easy) way to get the dust out of the power supply . They can be choc full of dust , on really dusty machines. |
1101 (13337) | ||
| 1446990 | 2018-03-07 23:51:00 | I had a computer to look at from a woodworking firm, the PSU was as you said choc ful............. of sawdust :) The only way to clean it was to open it up and brush and suck the crap out, the rest of the machine was as bad too. I still don't believe in using compressed air is a good idea on anything resembling instruments, bearings etc, it's the way I was brought up :) edit: Especially as I had a piece of steel swarf go into my eye on more than one occasion !! |
Terry Porritt (14) | ||
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