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For SpaceNut ... we only had one other topic containing the word pneumatic ...
That one was about using dry ice as an energy storage medium, and that is more appropriate for Mars.
This topic is offered in hopes that NewMars members will contribute links and comments to advance the concept of building an energy storage device for pneumatic tools using compressed air.
In another topic, kbd512 recently posted this:
If someone started making CNTRP 700 bar H2 storage tanks, which will literally halve the weight of the gas tanks when compared to CFRP, no improvement to fuel cell energy efficiency or power density is required to immediately and dramatically beat gas turbines and kerosene by 25%.
The wording implies (to me at least) that such tanks do not currently exist.
if such a tank existed, it could certainly hold air, since hydrogen is more difficult to hold than air.
The objective of this topic is to discover and publish the specifications for a compressed air energy storage system able to provide 7 CFM (cubic feet per minute) of compressed air at 90 psi for 20 minutes.
(th)
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If there is a forum reader who is not a member and would like to contribute to this topic, please see Recruiting Topic for procedure.
(th)
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Status of Pneumatic Tool Energy Storage system project:
At the moment, the output testing equipment is in development....
A 12 volt generator is on hand, and a V-belt recently arrived. The immediate development work planned is to mount the generator on a frame next to a drill press, and to confirm that the generator produces electric current when turned by the drill press.
In another topic, the objective for this test equipment was defined as producing 20 amps at 12 VDC for 20 minutes, using stored compressed air as input.
The major components needed include an air tank, and air compressor to fill the tank, and an air motor to turn the generator.
Minor components that would complete the test system would include electric lights able to provide a 20 amp load at 12 VDC.
(th)
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The forum contains a topic about Portable Power ....
I found this post in the topic: https://newmars.com/forums/viewtopic.ph … 62#p208162
The post contains calculations about air flow in a pneumatic tool configuration.
The specific tool in study was a reciprocating saw that consumes 6.5 CFM (cubic feet per minute) at 90 PSI (6 bar)
The ongoing discussion of storage tanks for various purposes (air motor automobiles and hydrogen powered aircraft) elsewhere in the forum includes discussion of 700 bar carbon based storage tanks. I am under the impression that such tanks exist at present, but tanks able to hold lesser pressure are apparently available from vendors in China. More details about tanks that are currently available would be a welcome addition to this topic.
As a reminder ... the purpose of ** this ** topic is to find, procure, configure and test a set of components that can provide 20 Amps of 12 VDC for 20 minutes. If that goal can be achieved, then the knowledge of how to achieve at a higher level would potentially be available.
(th)
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