Determine the change in the specific internal energy of hydrogen (H2), in kJ/kg, as it is heated from 400 to 1000 K, using:
a.) The empirical specific heat equation (Shomate Equation) from the NIST Website.
b.) The CoV value at the average temperature.
(Use the heat capacity polynomial to determine this CoV value.)
c.) The CoV value at room temperature, 25oC.
(Use the heat capacity polynomial to determine this CoV value.)
3 comments:
Problem 3 asks for DH and this one asks for DU. Does the shomate equation work for DU as well??
If not, how could I get DU from DH??
DU is the integral of Cv whereas DH is the integral of Cp. Remember that:
Cp = Cv + R
so
Cv = Cp - R
Check out Chapter 3, Lesson C, example #2 to see how DU gets calculated.
Jay-Z & Beyonce:
Who knew stars were interested in Thermo ?
Beyonce is correct, Jay-Z.
Here we need to determine DU using DU = INT[Cv dT] and Cv = Cp - R for ideal gases. So, you get the Cp from the back of the book (or NIST) and subtract R and you have Cv.
Thank you Ms. Knowles.
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