Quote:
Originally Posted by Al Skierkiewicz
Has anyone actually done the math? How much more storage volume conversion at 60 psi do you get with 110 psi stored in two tanks as opposed to 120 psi? Assume that the regulator is the same efficiency at both pressures, and that the compressor efficiency doesn't matter.
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In terms of air storage, it is a linear calculation. Essentially ideal gas law, PV=nRT. So saying 60 psi is the minimum useful pressure. 110 PSI gives a delta P of 50. 120 PSI gives a delta P of 60. A 20% difference. That is in the physics lab with no friction, a perfect vacuum & ignoring entropy. All of this will effect how useful the extra air will be.
Life is always more complicated than that. In our case, the minimum useful pressure was 100 psi because that is what it took to consistently shoot the ball. What was important for us was that the compressor turned on before then. 120 psi would have been useful for precharging before the match, but 110 was good for during the match. We also went with minimal on board air storage to keep the recharge time low. So I largely agree with Mr V about what is a good set pressure.