Problem 3 A closed gas cylinder assembly undergoes a process

Problem 3: A closed gas cylinder assembly undergoes a process from state 1 to state 2. Assuming the process to be a polytropic process, is the process reversible? Why?

Problem 4: How is enthalpy defined? Explain what each term in the equation means and state its units in S.I. system.

Solution

Yes, the process is reversible because the heat and work transfer done always follows the polytropic paths and is given by

Q=C₁(T₂-T₁) and W = (H₂ - H₁) - Q

H is the enthalpy which is the energy required for measurement of the work done by the system considering the heat.

W = work done (SI unit is joule)

H = enthalpy (SI unit is joule)

Q = heat (SI unit is also joule)