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@SJC_1 Maybe. Some years ago, the DOE commissioned a study to determine just how much fuel ANG could hold. They created activated carbon monoliths which held about 180:1 (180 cubic feet of CNG for each 1 cubic foot of actual volume) while only needing 60 bar (900 psi). 60 bar would normally hold 60:1. So it held 180 bar worth of fuel while only needing 60 bar of pressure. That certainly reduces the amount of energy needed to compress the fuel into the tanks (no one seems to talk about how much energy you have to add for the C in CNG) and makes the tanks cheaper. But if you can only get 2,700 psi worth of fuel (180:1 * 15 psi / bar), while existing pressure tanks can go to 3,600 or 5,000 ... you are carrying LESS fuel per cubic foot of tank space. And the carbon monolith in the tank is NOT lightweight. No word on what kind of ratio their carbon monolith stores. You'd need at least 240:1 to match 3,600 psi, at least 333:1 to match 5,000 psi. Finally, ANG is exothermal on filling, endothermal on release. Having relatively small cross-section tanks and maybe some kind of fan to propel air between the tanks when fueling would work well. If the monolith gets too warm, it doesn't catch fire but the adsorption process does slow down and, because the pores are expanded, they don't "stick to" the fuel as well, meaning reduced storage capacity. Don't get me wrong. I like ANG. I'd love to see it succeed. But I've not heard of anyone getting an ANG carbon monolith beyond 200:1. Which means that the only way it makes sense is if the lower pressures can keep the tank construction cheap enough to offset the cost of the carbon monolith and the cost of needing more tank volume per 100 miles range.
This site needs a "mark as spam" or "remove spam" link in it. The identical posts by "Hydro Newbie" and "Car Hydraulics" have nothing to do with hydraulic hybrid propulsion. They link to an article about hydraulic suspension components for lowriders and other b.s.