I am currently attempting to determine the amount (mass) of water that is condensing during a temperature change inside of a heat exchanger. Inititial Temp is 300°F, Initial Pressure is 19.696psia (5psig) in the air stream, Initial %RH is 5%. Final Temperature is 129°F and becomes 100% RH at this point. I have steam tables and can determing saturation pressures at these temperatures. Psat Initial=66.98psia, Psat Final is 2.1719psia.(adsbygoogle = window.adsbygoogle || []).push({});

I know I can determine the actual vapor pressure by multiplying the %relative humidity by the saturation pressure, and that I need to determine the actual vapor pressure initial and final and subtract the two to get a delta P to use in the PV=nRT equation and solve for n and muliply that by the molar mass to finally come up with a mass.

What I am unsure of is if I need to multiply the vapor presures by the ratio of my air stream pressure over the ambient air pressure to come up with an actual vapor pressure due to the fact that the air is at 5psig. I am also unsure as to whether the final vapor pressure should be equal to the Psat or is it PsatXPambient/19.696psia? In addition to that, What would I use for Volume and T in PV=nRT? I know the flow rate is 936FT^3/min.

If someone could help me set this up correctly I would greatly appreciate it. Thanks for your time and willingness to share some insight.

-Ryan

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# Mass of Condensed Water Out of a Moist Air Stream

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