Considering the variability of the specific heats of air, plot the change in specific internal energy of the air as it is cooled from an initial temperature of 1250 K to final temperatures ranging from 300 K to 1200 K.
Given: T1 = 1250 K
For an ideal gas with variable specific heats. ?u = u2 – u1 .
The values for the specific internal energy can be found on-line or from air tables at specific temperatures.
u1 = 977.93 kJ/kg
Plotting the change in specific internal energy yields
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