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

Chris Covington malth at umich.edu
Mon Mar 19 13:03:12 EST 2001

That assumption benefits us though - a higher horsepower rating at a
higher temperature, especially for a turbo, would translate to even more
horsepower at a lower temperature.

'91 2cq

On Mon, 19 Mar 2001, Phil Rose 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.

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