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by gooseyard
3990 days ago
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I believe the Airing thing is expected to use these things: http://www.murata-ps.com/emena/2012-05-22.html I was also skeptical of the Airing claim, although after reading about the Murata piezo blower things, they're amazing, whether Airing is able to make a CPAP out of them or not. Frankly, as an old, fat, CPAP using guy, I'd rather eat mouldy cheese than use a nasal pillow CPAP device. Plus, the Airing thing would have to be strapped to my face anyway; at my Rx pressure it'd blow out of my nose within an hour. The hose on my traditional BiPap turbine machine doesn't bother me at all. I'd be delighted to have a smaller BiPap machine made out of these Murata things, if it meant a less bulky power supply and a smaller base unit. |
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Armed with this, I took interest in your response and checked out the math.
Interestingly, this device seems to produce the pressure!
Using their specifications of the piezoelectric pump on the page you sent.
Piezoelectric pump produces 1.5kPa. This converts to 15.3 cm WC (centimeters of water column) or cmH2O. 4-20 cmH2O is the range of a cpap!!
But, the airflow needed at that pressure is a critical issue as long as you want to breathe freely. The piezoelectric pump produces 0.8 liters per minute.
At http://www.sleepdex.org/cpap.htm it says a cpap produces 20 to 60 liters of air per minute (lpm).
To reach the lowest end you need 20 lpm. Calculate 20 / .8 = 25
So you need 25 of these piezoelectric pumps to reach the lowest possible; 75 of them to reach the high end. This is literally almost an order of magnitude.
And in case you thought so; piezoelectrics can't scale. They are very limited in size, by the physics of the vibrations.
So still not even close. It would require a quantum leap in technology over what we have available.