Two kilograms of air within a piston–cylinder assembly
execute a Carnot power cycle with maximum and minimum
temperatures of 750 K and 300 K, respectively. The heat
transfer to the air during the isothermal expansion is 60 kJ.
At the end of the isothermal expansion the volume is 0.4 m3
.
Assuming the ideal gas model for the air, determine
(a) the thermal efficiency.
(b) the pressure and volume at the beginning of the isothermal
expansion, in kPa and m3
, respectively.
(c) the work and heat transfer for each of the four processes,
in kJ.
(d) Sketch the cycle on p–V coordinates.