Reconsider problem 3.109 where carbon dioxide is compressed from −20◦C, x = 0.75 to a state of 3 MPa, 20◦C in a piston/cylinder where pressure is linear in volume. Assume heat transfer is from a reservoir at 100◦C and find the specific entropy generation in the process (external to the carbon dioxide).

Data from problem 3.109

Air in a piston/cylinder is at 1800 K, 7 MPa and expands in a poly tropic process with n = 1.5 to a volume eight times larger. Find the specific work and specific heat transfer in the process using Table A.7 and draw the T–s diagram.