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

[Feico van der Laan]

Corect about the density I meant to put 59F and 29.92
(lost a nine on the way) Inches HG (Sorry about that).
But here is a link for standard atmosphere. This is
the average Pressure and Temperature at Sea Level.

http://nssdc.gsfc.nasa.gov/space/model/atmos/us_standard.html

Best regards,
Feico van der Laan
--- Phil Rose <pjrose at frontiernet.net> wrote:
> 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
> -- 
> 
> Phil Rose
> Rochester, NY
> mailto:pjrose at frontiernet.net


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