Basic Mechanical Engineering (3110006)

BE | Semester-1   Summer-2020 | 11-06-2020

Q1) (c)

Derive an expression for internal energy for a closed system.

From the 1st law of thermodynamics, (for closed system)
 
Q = U + W
 
But work done is zero, for constant volume process, thus
 
Q = U + 0
 
According to definition of Specific heat,
 
C = Q mt Q =  mCt 
 
Substitute the value of Q in above equation,
 
U =  mCvt