Amotor vehicle engine operating with a diesel engine takes in atmospherics air at a temperature of 30°c and pressure of 1 bar. during combustion, the maximum obtainable temperature is 1345°c. calculate (a) the air standard (b) thermal efficiency of this diesel engine if the compression ration is 24/2.

η=0.568

Explanation:

At inlet condition

temperature = 30 C and pressure P=1 bar

The maximum temperature = 13456 C

Compression ratio r= 12

We know that for process 1-2

Now for process 2-3

So the cut off ratio ρ=1.97

Efficiency of diesel engine

Now put the values

   ⇒η=0.568

So the efficiency is 56.8%.

answer:

sure does

explanation: