Cylinder conditions at the start of compression in an SI engine operating at WOT on an air-standard Otto cycle are 60C and 98 kPa. The engine has a compression ratio of 9.5:1 and uses gasoline with AF = 15.5. Combustion efficiency is 96%, and it can be assumed that there is no exhaust residual. Calculate: %3D (a) Temperature at all states in the cycle. [0C] (b) Pressure at all states in the cycle. [kpa] (c) Specific work done during power stroke. [kJ/kg] (d) Heat added during combustion. kJ/kg] (e) Net specific work done. [kJ/kg] (f) Indicated thermal efficiency. [%)

(a) Derive an expression for the air standard efficiency of a Brayton cycle in terms of pressure ratio. (b) An engine working on Diesel cycle has a compression ratio of 15 and fuel supply is cut off at 8% of stroke. If the engine has a relative efficiency of 50%, determine the fuel consumption per kW-hr. Assume the fuel has a calorific value of 42000 kJ/kg.

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I only need help with parts f to i.   At the beginning of the compression process of an air standard Otto cycle, p1 = 1 bar, T1 = 300 K. The maximum temperature in the cycle is 2250 K and the compression ratio is 9.8. The engine has 4 cylinders and an engine displacement of Vd = 2.1 L.  Determine per cylinder: a)    the volume at state 1.b)    the air mass per cycle.c)    the heat addition per cycle, in kJ.d)    the heat rejection per cycle, in kJ.e)    the net work per cycle, in kJ.f)     the thermal efficiency in %.g)    the mean effective pressure, in bar.h)    Develop a full exergy accounting per cycle, in kJ. Let T0 = 300 K, p0 = 1 bar.i)    Devise and evaluate the exergetic efficiency for the cycle.