Hi friends
I'd like to ask why the ratio cp/cv isn't constant between suction and discharge in a compressor in many cases
Thanks a lot
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Posted 10 March 2014 - 04:20 AM
Hi friends
I'd like to ask why the ratio cp/cv isn't constant between suction and discharge in a compressor in many cases
Thanks a lot
Posted 10 March 2014 - 04:28 AM
N.BH,
Because the pressure / temperature conditions at suction and discharge are not the same. This is specifically true when the compression ratio (Pd / Ps) is very high for a given compression process.
Regards,
Ankur.
Posted 10 March 2014 - 04:38 AM
Thanks , I have also another question for a case when Cp/Cv is constant for suction and discharge stream :
In the GPSA BOOK it's indicated that the isentropic exponent is the ratio Cp/Cv
but when I look into HYSYS , I find that they don't have the same value
For example : Cp/Cv = 1.263 for suction and discharge stream
isentropic exponent =1.1708
Edited by N.BH, 10 March 2014 - 04:40 AM.
Posted 10 March 2014 - 04:54 AM
N.BH,
The term isentropic exponent is used for real gases whereas writing just Cp/Cv denotes ideal gas conditions. The wikipedia link below distinguishes this as gamma (γ) for ideal gas and kappa (κ) for real gas:
http://en.wikipedia...._capacity_ratio
Regards,
Ankur
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