Calculating Specific Enthalpy of Air at Different Temperatures and Pressures

[JSBeckton]

I'm sure this is a really dumb question, but how do you find the specific enthalopy of air at a given temp and pressure? I Have been using my thermo tables for everything but I do not have tables for air. The only tables for air that I see list the properties at .1 Mpa and I need it at 200, and 90kPa. Do I use Cp?

 

[Cyrus]

Enthalpy for Ideal gases are given in your tables as functions of temperature in Kelvin.

You can use cp when the temperature range is small as an approximation.

 

[JSBeckton]

ok, thanks