On Wed, Jun 22, 2011 at 2:39 PM, Jed Rothwell <[email protected]> wrote:
> Joshua Cude wrote: > > Even if it gave the mass of water vapor per unit volume of steam, you'd >> need to know the volume to get the mass. For that you'd need a flowmeter. >> But if you had a flowmeter to measure the flow rate of the steam, you >> wouldn't need the RH meter. >> > > They do not need a flow meter. They weigh the reservoir before and after > the test. That works better than most flow meters. > That gives the input flow rate. If you want to know how much steam vs liquid is coming out the other end, then you need to measure the flow rate at the output. You see, water changes volume when it changes phase. > > 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.
