An air-standard cycle is executed within a closed piston-cylinder system and consists of three processes as follows: 1-2 v = constant heat addition from 100 kpa and 27 degree c to 700 kpa 2-3 isothermal expansion until v3 = 7v2 3-1 p = constant heat rejection to the initial state assume air has constant properties with cv = 0.718 kj/kg. k cp = 1.005 kj/kg. k, r = 0.287 kj/kg. k, and k = 1.4.
(a) sketch the p-v and t-s diagrams for the cycle.
(b) determine the ratio of the compression work to the expansion work (the back work ratio).
(c) determine the cycle thermal efficiency.