Determine the internal energy change of hydrogen in kJkg as

Determine the internal energy change of hydrogen, in kJ/kg, as it is heated from 200 to 900 K, using: The empirical specific heat equation as function of temperature (Table A-2c) The c_v value at the average temperature (Table A-2b) The c_v value at room temperature.

Solution

1.Q=mcv(t2-t1) this is the emprical relation for the specific heat equation

2. given t1=200,t2=900

tavg=550,cv=14.53KJ/kg

Q=mcv(t2-t1)=1*14.53*(900-200)=10171KJ

3.cv at room temperature=14.26KJ/Kg

Q=9982 KJ/Kg