4. One kg of air is taken through a Diesel cycle. It has an initial temperature
of 350 K, initial pressure at 100 kPa, compression ratio of 20 and heat
addition of 2000 kJ. Assume that the air is modelled as an ideal gas.
Given that $\gamma=1.4$, $c_p=1.005$ kJ/kgK, $c_v=0.718$ kJ/kgK and R= 0.287kJ/kgK.
Satu kg udara melalui kitaran Diesel. Ia mempunyai suhu awal 350 K, tekanan
awal pada 100 kPa, nisbah mampatan 20 dan penambahan haba sebanyak
2000 kJ. Andaikan udara sebagai gas unggul. Diberikan $\gamma=1.4$, $c_p=1.005$
kJ/kgK, $c_v=0.718$ kJ/kgK dan R= 0.287kJ/kgK.
...6/-
SULIT
SULIT
EMH 211
-6-
(i) Sketch the cycle on a P-v diagram.
Lakarikan kitar pada rajah P-v.
(10 marks/markah)
(ii) Calculate the cut-off ratio.
Kirakan nisbah pemotongan.
(30 marks/markah)
(iii) Calculate the cycle thermal efficiency.
Kirakan kecekapan terma kitar.
(30 marks/markah)
(iv) Calculate the mean effective pressure for the cycle.
Kirakan tekanan berkesan min bagi kitaran tersebut.
(15 marks/markah)
