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#101 2017-12-09 20:11:52

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 10,843

Re: Running on Compressed Air?

Which is part of the issue when using it to make methane.
So once we start to compress the CO2 for that we can use any excess gasses that are exhaust from that process to be used for this type of rover. Since this can use heat to help with the power stroke we can also keep it closed loop in that the exhaust from the engine being reprocess via a radiator to recool the exhaust gasses. A compressor attached like the AC pump on your car can bring in more CO2 while we drive around to keep pressures up.

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#102 2017-12-10 08:32:52

elderflower
Member
Registered: 2016-06-19
Posts: 603

Re: Running on Compressed Air?

CO2 can be collected using an amine adsorbent. This can then be pressurised and thermally stripped. The CO2 will then be at a higher pressure than you started with. That might need a few stages if it is at all possible at Mars pressures.  Perhaps Oldfart can advise on the possibility.
Otherwise industrial sized vacuum pumps would be employed as the low pressure stage. I know they can do this compression.

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#103 2017-12-10 15:15:58

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 10,843

Re: Running on Compressed Air?

We can also use cabin stripped co2 from the scubbers to aid in boosting the pressure we are keeping and give the means to use waste CO for the working gas as well. Since we will want more oxygen from insitu sources to replentish the cabin with.

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#104 2017-12-10 17:35:52

kbd512
Member
Registered: 2015-01-02
Posts: 1,251

Re: Running on Compressed Air?

SpaceNut,

I like it.  It fits in with the air tools for Mars design methodology.  If a re-purposed gas powered vehicle can go that far on a single tank of CO2, imagine how far a lightweight purpose built motorcycle could go.  There are no electronics to boot.  Having simple and reliable propulsion like this motorcycle can make or break a surface exploration or construction mission.  NASA should get their hands on one of these things and test the durability and longevity of the design.  It looks like a winner to me.

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#105 2017-12-17 08:43:10

SpaceNut
Administrator
From: New Hampshire
Registered: 2004-07-22
Posts: 10,843

Re: Running on Compressed Air?

To covert the stream of gasseous energy to electrical we could design a permanent magnet alternator generator as a means to to the end. This link is about how to retrofit a car alternator but the equations and how to make one are all still pertenant to making it for any application.
http://digitalcommons.calpoly.edu/cgi/v … ntext=eesp

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