Plot the change in specific enthalpy as a function of final temperature for the following gases, each of which is initially at 25°C:

(a) hydrogen, (b) nitrogen, (c) air, (d) carbon dioxide. Assume each gas behaves as an ideal gas with constant specific heats, and consider a final temperature range of 0°C to 100°C.

Given: T1 = 25°C

What will be an ideal response?


For an ideal gas with constant specific heats: ?h = cp (T2 – T1)

For the constant-pressure specific heats: (a) H2 : cp = 14.307 kJ/kg-K; (b) N2: cp = 1.039

kJ/kg-K; (c) air: cp = 1.005 kJ/kg-K; (d) CO2: cp = 0.846 kJ/kg-K (at 300 K)



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