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Ed Fox, Tampa FL on PRV control question

By: Ed Fox, Tampa FL [24] 0 Stars
Date: Thursday, October 18, 2007
Time: 7:30:32 AM

Have you ruled other control system issues such as: Are you sure that the firing rate signal (fuel demand) is constant or is it too fluctuating? If the fuel demand is constant then the gas control valve should be constant (non-fluctuating) too.

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Is Cp/Cv applicable to steam to calculate?
By: Kent mayhew [2161]

The reason that isobaric Cp heat capacity is greater than isometric Cv is that isobaric involves expansion. Remember our atmosphere has mass, so in order for a system to expand it must displace that mass. And this requires work. So Cp requires work plus the energy to heat the gas , while Cv only requires the energy to heat.

So for all gases and/or steam the work required to expand a given volume is the same that being the work required to displace our atmosphere by a given volume.

Hence t....   Read All
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