Question

A Diesel cycle has a compression ratio of 12 and cut-off ratio of 2. At the beginning of the isentropic-compression process, the pressure and temperature are 100 kPa and 35°C (308 K), respectively. During the constant-pressure process, heat is added to the working fluid from a reservoir at a temperature of 1760°C (2033 K). During the constant volume process, heat is rejected to the environment, which is at 30°C (303 K) and 100kPa. For the air involved, it may be assumed that Cp = 1.005 kJ/kg.K and the specific heat ratio, k = 1.4.

(i) The temperature and pressure of the gas at the end of isentropic compression are _a_ K and _b_ MPa, respectively. The temperature and pressure at the end of the heat addition are _c_ K and  _d_ MPa. (ii) The cycle efficiency is _e_ %. (iii) The maximum thermal efficiency if the cycle operating between the given reservoir temperatures is reversible is _f_ %.

Answer 1