Water saturation pressure
Water saturation pressure
(OP)
I have a flow calculation for SCFM which requires saturation pressure (Psat)of water at ambient temperature. See attached calcuations. However the saturation pressure (Psat)curve stops at 32 degF. Is there a different curve used for saturation pressure of water at below freezing temperature or shall I ignore the Psat value for 32F and below?





RE: Water saturation pressure
RE: Water saturation pressure
RE: Water saturation pressure
You can find a calculator at the link below (results given by the calculator are in agreement with those reported in the document posted by Chance17
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RE: Water saturation pressure
Practically every hvac engineer will have this book and the formulae have been in there for years. The cd in the back of the book has both metric and imperial versions of the formulae.
RE: Water saturation pressure
RE: Water saturation pressure
The water molecules can have a vapor pressure less than or equal to saturation.
Saturation = chemical equilibrium and is documented by tables or equations that fit data.
One needs an analysis to determine actual vapor pressure.
RE: Water saturation pressure
RE: Water saturation pressure
There are anyway many other correlations available, basically all working with logarithmic correlations between saturation pressure and actual temperature. You can find a bunch of these correlations at the link below
http://cires.colorado.edu/~voemel/vp.html
RE: Water saturation pressure
RE: Water saturation pressure