projects:air-for-workshops
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projects:air-for-workshops [2011/08/05 15:35] – spinery | projects:air-for-workshops [2011/08/05 23:33] – [The solution] spinery | ||
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Opinions please. | Opinions please. | ||
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+ | UPDATE: | ||
+ | I was doing a quick comparison between screw compressors from different companies and piston compressors, | ||
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+ | I was also doing volumetric calculations - the suggested 300 litre tank @ 30 bar holds: | ||
+ | 1125 litres of 8 bar air (8 bars per litre) | ||
+ | 1500 litres of 6 bar air (6 bars per litre) | ||
+ | and feed from compressor can counter up to 330 litres of air per hour. | ||
+ | If we would like to contain such volumes in appropriate tanks, the available tanks are slightly more cost-effective for 8 bar, and less cost-effective for 6 bar, at the same time, taking up considerable space (2,5 metre height, and almost a metre in diameter, weighting 1/3 and 1/2 as much). | ||
+ | Increasing the pressure further to 55 bar, increases the compressor related costs, while providing not much benefit in terms of storage or efficiency. | ||
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+ | Ensuring large capacities for air, the compressor won't have to start and stop every time you knock down the air a few bars like it is in case of normal compressors. It will be doing long cycles of work, to counter the exiting air, and replenish the air in the tank. | ||
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+ | I also expect that reheating of the working air using compressor heat will dramatically increase efficiency because of the high compression rates. It would be ideal if we could completely cool the compressor with working air in air-heavy applications such as sanding (at least for short periods of time, when the amount of expelled air exceeds the compressor' | ||
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+ | The amount of heat created could also be used to generate energy that can, in turn, provide several different tasks (turbocharge the compressor, precool air entering the compressor, etc). I have no data regarding temperatures generated bu the compressor, but it's a two-stage compressor. While it is crucial to maintain as low temperature as possible of the air that enters the second piston, beyond that, we have place for experimentation. | ||
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+ | I have a crazy idea regarding hi-volume sanding using this setup. Obviously, with large volumes of air running out of the sander' | ||
+ | https:// | ||
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+ | ____________ | ||
+ | OK, it appears I've been miscalculating the air consumption. The litres are calculated for atmospheric pressure, that is 1013 millibars (right?), which is a bit over 1 bar. | ||
+ | The correct calculations look as follows: | ||
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+ | 300 litres of tank capacity * 30 bar max pressure = 9000 litres of air | ||
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+ | 300 litres of tank capacity * 8 bar tool operational pressure = 2400 litres of air | ||
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+ | So we have 9000-2400=6600 litres of air available before the pressure starts dropping below 8 bar tool operational pressure. If we assume that a tool uses 220 litres of air per minute, then | ||
+ | 6600/220=30 minutes of undisturbed operation. | ||
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+ | It should be able to survive around 6 minutes on the bigest meanest sandblasters :P The kind you use for bridges. And then it would take half an hour for the compressor to rebuild the pressure. | ||
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+ | And this means that we can use higher pressures for smaller sandblasters, |
projects/air-for-workshops.txt · Last modified: 2014/04/02 06:57 by 127.0.0.1