Timeline for How can my low tech free diving species ventilate their homes?
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 7, 2021 at 9:31 | comment | added | Chris H | ... I suggest multiple small pumps powered by wind or even wave action | |
| Sep 7, 2021 at 9:30 | comment | added | Chris H | ... Now you introduce a volume (though no timescale; over a year it wouldn't be hard but over an hour it would be), and if that's what you assume, your conclusions follow. If you pull a bucket of air down, you're still doing work against gravity, and still compressing the air, so the major losses are still there. You can't balance a wheel against the air unless you can separate CO2-rich air to push back up. That would be a nice system, but without modern tech you'll be transporting a lot of slightly CO2-enriched air back up, wasting more effort than you'd save | |
| Sep 7, 2021 at 9:27 | comment | added | Chris H | @Kamitergh a difference of 10m is a difference of 1 bar. You seem to be using absolute pressure instead of gauge pressure, and including the 1 bar from the atmosphere at the surface, but gauge is what matters here as the atmospheric pressure doesn't hinder us. My best hand bike pump will apparently do 11 bar. | |
| Sep 7, 2021 at 9:04 | comment | added | Kamitergh | @Chris H 10m is 2 bar :) standard hand pump is 3-4bar, this one is 7bar: amazon.co.uk/Coleman-QuickPumpTM-Dual-Action-Hand-Pump/dp/…. Nothing bigger in hand ones. I do not say taht You cant use hand pump. im saying that pumping 10 000 litres of air by hand pump to more than 5m will be problematic. Foot one too. Need something bigger to be useful. And bigger sized hand pump is hard to be powered by hands. By steam engine - yes. By wind - yes but I think balanced whell with jugs/leather bags be more energy efficient. | |
| Sep 7, 2021 at 8:14 | comment | added | Chris H | @Kamitergh 1 bar is 10 m depth, and race bike tyres run at up to about 7 bar - and have done since the days of leather gaskets. So leather should support a few 10s of metres. Of course to get any volume the leather is only the seal, not the structure of the piston, just like with my current pump (rubber O-ring and plastic piston). The limit on depth is more likely to be the strength of the supporting materials. As the question states "shallow" and "buildings submerged", I think we're good assuming about 10-20 m, so a rather tall building would reach close to the surface. | |
| Sep 7, 2021 at 7:56 | comment | added | Kamitergh | @Redbud201 Yes that nice and can work. if use some one way valve and presure tanks, and make them in line (pump, valve, tank, pump, valve...) then can go deep. If done properly then can go even for 40-50m. | |
| Sep 7, 2021 at 7:52 | comment | added | Kamitergh | @Chris H Yes leather was used but on low presure.When going high then have problem. Bike pump-if good one then can be used to pump air to 5m deep.Best actual,feet powered,car ones can work for 15m. Problem is not with working or not but with that how much work need to be done to pump same air volume to equal depth.First industrial steam powered pumps works up to 30m | |
| Sep 7, 2021 at 7:42 | comment | added | Kamitergh | @V.Aggarwal not exactly. water have low compresion and high viscosity, air quite high compresion and low viscosity. Tinny gap in water pump is not a problem, can pump high, tiny gap in air pump and almost no presure coming out. | |
| Sep 7, 2021 at 4:25 | comment | added | Redbud201 | Latex rubber comes from trees and plants. The only "high tech" part of rubber is vulcanization which adds sulfur and heat to toughen the rubber. But a piston as such is not entirely necessary. You can use a flip top valve or diaphram and use wave motion to pump air. Tubes could be readily taken from plants like bamboo, and latex rubber would make a flexible airtight seal between sections. | |
| Sep 6, 2021 at 13:40 | comment | added | Chris H | @Kamitergh leather was used for this sort of thing, and even hoses. It's a bit less efficient than rubber, but will still work. Leather pistons for bike pumps are still available, for example. This does require surface infrastructure though - you're pushing the air down | |
| Sep 6, 2021 at 12:17 | comment | added | V.Aggarwal | @Kamitergh That is a very good point. can we not use some type of plant material, weeds, or a tree resin to replace rubber. Or maybe some type of fish or animal bladder/leather. Also pumping air should require less force than pumping water. | |
| Sep 6, 2021 at 11:41 | comment | added | Kamitergh | Rubber or something high-tech needed to operate with presure high enough to go for more than 2 meters deep. | |
| Sep 6, 2021 at 11:02 | history | answered | V.Aggarwal | CC BY-SA 4.0 |