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| projects:air-for-workshops [2011/08/05 21:09] – [The solution] spinery | projects:air-for-workshops [2011/08/05 23:33] – [The solution] spinery |
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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's nozzle, we will be running out of air really quickly. The alternative here is to burn small amounts of heavily compressed (efficiency!) air/propane mixture (could also be oil or wood gas) in a chamber, and to use the generated pressure as a motive fluid to power an injector. Heat generated will allow for production of steam, that can be delivered to the motive fluid prior to its entrance into the injector, but after the fuel has burned. Such a device should also be an effective vacuum pump for gasses and liquids (a blessing if your basement ever gets flooded, ask me how I know). I've got no calculations on this one, though, as such calculations exceed my current abilities. I did however convert a Karcher pressure washer into a pretty efficient injector for expelling water out of a basement. It involved a PVC pipe, and could spew water out at rather impressive volumes, even though the injector nozzle was misaligned. | I have a crazy idea regarding hi-volume sanding using this setup. Obviously, with large volumes of air running out of the sander's nozzle, we will be running out of air really quickly. The alternative here is to burn small amounts of heavily compressed (efficiency!) air/propane mixture (could also be oil or wood gas) in a chamber, and to use the generated pressure as a motive fluid to power an injector. Heat generated will allow for production of steam, that can be delivered to the motive fluid prior to its entrance into the injector, but after the fuel has burned. Such a device should also be an effective vacuum pump for gasses and liquids (a blessing if your basement ever gets flooded, ask me how I know). I've got no calculations on this one, though, as such calculations exceed my current abilities. I did however convert a Karcher pressure washer into a pretty efficient injector for expelling water out of a basement. It involved a PVC pipe, and could spew water out at rather impressive volumes, even though the injector nozzle was misaligned. |
| | https://secure.wikimedia.org/wikipedia/en/wiki/Injector |
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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, and still get good operational times. If we double the air consumption rate, we get 15 minutes of continuous operation, and that's a LOT. |
