On Wed, Jun 22, 2011 at 3:04 PM, Jed Rothwell <[email protected]> wrote:
> ** > Joshua Cude wrote: > > If they did not measure the weight of the water, you would be right. The >> RH meter reading alone is not sufficient. >> > > The RH meter reading is not enough even with the input flow rate. You > need the output flow rate. > > > Nope. All you have to know is how dry the steam is, what the temperature > is, and what the total mass of the steam is. You can derive the steam flow > rate from that. > Right. But how do you get the total mass of the steam? Even in your interpretation of what information that device provides, it only gives mass per unit volume. So you need the volume to get the mass. To get the volume, you need the flow rate. Infinite loop. It's a rookie mistake, and you're a seasoned programmer. > > It is rather difficult to measure a gas flow rate accurately. > Measuring the flow rate of wet steam or any 2-phase fluid is difficult, but mainly the inaccuracy comes in converting the volume flow rate to a mass flow rate. But measuring the flow of dry steam is easy, and can be done to a few % accuracy. Google steam flow meter to see plenty of examples of commercial devices designed for the purpose. Since the claim is that the steam is dry, this should work, and should indicate a rate 1700 times the input. If the steam is wet, the volume flow rate measurement will presumably be much lower; even if it is not accurate, a lower value will indicate wet steam.
