An Otto engine has a compression ratio of 20:1 with an inlet of P1 = 95 kPa, T1 = 290 K, and volume 0.5 L (the inlet state corresponds to the low temperature at bottom-dead-center). The maximum cycle temperature is T3 = 1800 K.
For step 2, why are we using cv in our calculations? I imagine this would cause significant error since both pairs of states (2 and 3, as well as 1 and 4) are far from the nominal value of 300 K suggested when we use the 0.718 as our specific heat in constant volume.
You are correct. Technically, we are supposed to use Cv with their corresponding temperature for getting more accurate result. In this example, our main focus is to show how Otto cycle works so we simplified the calculation by treating Cv as a constant.
@@DrGucci Since my previous comment, I've seen such in practice. Please forgive my hastiness, and thank you for your timely response! I look forward to learning more from your videos in the coming semesters.
