[200q20v] Re: [UrS-technical] atmosphere and compressor maps - read'n 'riting & 'ritmatic

Phil Rose pjrose at frontiernet.net
Mon Mar 19 12:51:13 EST 2001

At 11:29 PM -0800 3/18/01, Feico van der Laan wrote:
>There may be a 2-4% error in this calculator. He uses
>the assumption that the standard conditions are:  Air
>temp 77 deg F,   29.235 Inches Hg Barometer, 0 ft
>altitude, 0% relative humidity.
>Standard air temperature is considered 59 Degrees @
>29.235 inches Hg. If my memory serves me correctly.

That sounds like a strange "standard temperature" to a chemist's ear. 
Although standard conditions in use for turbo compressor calculations 
might be different, the standard temp that's defined by international 
convention for gas-property calculations is 0 degrees C (32 F). Of 
course, any temperature  can be assumed for calculations, as long as 
it's specified. And similarly, the generally accepted value for 
standard pressure (1 atm) is 29.921 inches Hg. Of course, YMMV (your 
manometer may vary).

BTW, that tutorial by John Lucius was great. Certainly made it to my 
references list.


Phil Rose
Rochester, NY
mailto:pjrose at frontiernet.net

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