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View Full Version : P/E charts for 10,000 ft ?

08-19-2004, 04:48 PM
Anybody know where I can find P/E charts for the different refigerants for 10,000 ft altitude.

Thanks,

Andy Schoen
08-19-2004, 05:51 PM
If your simply interested in saturation curves, add 4.6 psi to the pressure values on a standard sea-level P-T card.

08-19-2004, 07:13 PM
I am interested in the Pressure-Enthalpy diagrams for plotting system performance. I am not sure that adding 4.6 psi work with these diagrams. The diagrams are also called PH diagrams.

Here is a link to the charts I am refering to.

http://www.dupont.com/suva/emea/pdf/molier_suva404a.pdf

Thanks,

condenseddave
08-19-2004, 10:49 PM
Lotta time on your hands, Max?:D

Andy Schoen
08-19-2004, 11:31 PM
Refrigerant properties like those shown on PH diagrams are figured on absolute pressure. They don't care what altitude you're at. Only your pressure gauge cares. Figure at 10,000 ft: psia = psig + 10.1

08-19-2004, 11:33 PM
Originally posted by condenseddave
Lotta time on your hands, Max?:D

No, just always trying to improve everything. Not enough time to go back to a job that I was already at once before. Have been doing mostly RTU's and commercial refrigeration for comercial buildings. Until about three months ago the refer tech that took care of all the restaurants at a ski resort left before he was fired. I had to start taking care of all his equipment. I have had nothing but problems with all the equipment, sensors located in wrong places, leaks, overcharges, fans not going the right direction, you name it. He's done it. I have to clean up 3 years of incompetence. I have gone through about half the equipment so far. Gotta love making things better.

I want to plot Molier charts to aid in trouble-shooting some of those tougher problems that I run into once in a while. Why the heck does every P/E chart I find have to be metric. It sure would be nice to see the saturation curves in F and PSIA and at 10,000ft. for 12, 22, 502, 134a, 401a, 401b, 402a, 404a, 409a, and probably one ot two that I forgot.