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PostPosted: Thu Dec 28, 2017 10:45 am 
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https://www.youtube.com/watch?v=ktup6CAvfGo

I watched a youtube video on energy bags... I do not see how much energy could be stored unless they are in *deep* water. Using water and elevation differences would be much easier. I googled to find some numbers like psi per HP, watts per HP and get...

given:
1GPM at 1500PSI == 1HP == 745.7WATTS
3500FT elevation difference == 1500PSI (of fresh water)

then:
1MEGAWATT HOUR == 804,613HP (per hour) == 804,613 GALLONS of water at 3500FT

also:
1MEGAWATT HOUR == 13,410GPM at 1500PSI

Using insulated ponds with transparent covers for solar heating or insulated poly tanks covered in bubble wrap (to prevent freezing) has to more efficient in comparison to the energy bag... And then there is rainwater collection and maybe even snow melting... Crazy to think about how many bulldozer hours it would take to move 1MW of snow and then melt it.

so?
the energy bag is small and even for its size it can not store much energy (at least not efficiently) plus the plumbing issues for high pressure air are significant. With water the plumbing at altitude is nothing special but it gets tough as the water flows down hill because of the "water hammering".

Air is compressible and water is not so water takes less energy to pump especially at high pressures. Air will heat when compressed and this energy gets lost as it cools which will reduce pressure making the pumping of air even more inefficient.

The air bag seems like a dud why are they using it?

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PostPosted: Fri Dec 29, 2017 3:23 am 
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Basically it is a inverted and more inefficient way of a pumped storage power plant...
In switzerland, we use pump-storrage quite extensively with a great efficiency (70-80% round-trip) to it since pumping water is more efficient than air (Compression, heat, jada-dada)

https://en.wikipedia.org/wiki/Pumped-st ... lectricity

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PostPosted: Sun Jan 21, 2018 8:46 am 
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I really don't know what they do inefficient stuff like this. I guess something good can come out if it, you never know. But I'd love to see someone like Thunderfoot (the youtuber) comment on the energy bag.


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PostPosted: Sun Jan 21, 2018 5:41 pm 
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I do not understand how the energy bag gets to continue...

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