Скачать или смотреть Problems in Clausius Inequality

Problem 1:
300 kJ/s of heat is supplied at a constant fixed temperature of 290ºC to the heat engine. The heat rejection takes place at 8.5ºC. The following results were obtained:
215 kJ/s are rejected.
150 kJ/s are rejected.
75 kJ/s are rejected.
Classify which of the results report a reversible cycle or irreversible cycle or impossible results.

Problem 2:
A heat engine receives reversibly 420 kJ/cycle of heat source at 327ºC, and rejects reversibly to the sink at 25ºC. There are no other heat transfers. For each of the three hypothetical amounts of heat rejected, in (a), (b), and (c) below, compute the cyclic integral of dQ/T. From the results shows that which case is irreversible, which is reversible, and which is impossible:
(a) 210 kJ/cycle rejected, (b) 105 kJ/cycle rejected, (c) 315 kJ/cycle rejected