A 2 litre four stroke direct injection diesel engine is designed to run at 4500 rpm with a power output of 45 kW . The volumetric efficiency is found to be 80 percent. The brake specific fuel consumption is $0.071 \mathrm{~kg} / \mathrm{MJ}$ and the fuel has a calorific value of $42 \mathrm{MJ} / \mathrm{kg}$. The ambient conditions for the test were 200 C and 1 bar. Calculate (b) Overall Efficiency
Explanation
To calculate overall efficiency, we need to find the fuel flow rate first. Given the brake specific fuel consumption, we can find the fuel flow rate as (45 kW / 0.071 kg/MJ) = 0.636 kg/s. Then, we can calculate the overall efficiency using the formula.
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