Air is heated from an initial temperature of 300 K to a final temperature of 1200 K. Considering the variability of the specific heats, determine the change in specific internal energy and the change in specific enthalpy for the process.
Given: T1 = 300 K; T2 = 1200 K
What will be an ideal response?
From the air tables on on-line air properties: h1 = 300.19 kJ/kg, u1 = 214.07 kJ/kg
h2 = 1277.79 kJ/kg; u2 = 933.33 kJ/kg
So, ?h = h2 – h1 = 977.6 kJ/kg
?u = u2 – u1 = 719.3 kJ/kg
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