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10,000 psi cng tank range (thought experiment)

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  • 10,000 psi cng tank range (thought experiment)

    yes, I know that this couldnt actually be implemented without the necessary upgraded high pressure hoses and filters etc... blah blah blah

    So what if 10,000 psi tanks were used like the ones used in the Toyota Mirai, that offers 32.3 gallons of hydrogen storage in 2 type 4 tanks

    Tried to find the water volume on these tanks, if anyone has it post it up.

    Personally I would like to see something like this in a CNG Accord/Camry sized vehicle. 20 or 30 GGE w/ reasonable trunk space would be a marked improvement over the CNG Civic especially with a 200+ HP V6 engine.
    Last edited by trdscfjc; 04-19-2017, 12:18 AM.

  • #2
    Check post # 5 on this thread


    • #3
      Thought i remember reading that, I wonder what capacity we would be looking at combining ANG with 3600psi pressure


      • #4
        Higher pressures of course do not provide a linear increase in fuel density. For example, my client in Australia uses 5000 psi (350 bar) CNG in dual-fuel mine trucks, a fuel they coin "High Density CNG" to differentiate from typical 200 bar 3000 psi CNG found in most places in the world.

        The Quantum cylinders in use at the mines are fully NGV-2 qualified for these pressures. While this is a 40% increase in pressure, the resulting CNG energy content improves by an approx. 23% and there are diminishing marginal returns as you go up in pressure. Somewhere I have in my files a graph depicting the "Z factor" compressibility of natural gas and I will try to dig it out. But in the mean time, my guess is that from 3600 psi to 10000 psi the resulting increase in fuel energy might be another 75% or so?

        As for adsorbed natural gas (ANG) it really shines at lower pressures - up to 1000 psi such as being promoted here:

        Graphs that I have seen at conferences would indicate that once you go beyond 1500 psi the fuel density of an ANG system is essentially the same as standard CNG, i.e. the lines converge at these higher pressures in graph linked above.
        Last edited by John Mitton; 04-20-2017, 10:14 AM.