Basic Mechanical Engineering (3110006)

Winter-2019

Question-4b-OR

BE | Semester-1 Winter-2019 | 03-01-2020

Q4) (b)

Determine the brake thermal efficiency of an engine with following data:
Brake Power = 80 kW, Fuel consumption rate = 20 kg / hour, Calorific value of the fuel = 43 MJ / kg.

Given data
$BP = 80 kW$
$m_{f} = 20 kg / Hr$
$CV = 43 MJ / kg = 43000 kJ / kg$

To Find $η_{bth} = ?$

The brake thermal efficiency of an engine is,
$η_{air} = \frac{BP}{\frac{m_{f}}{3600} \times CV}$

$η_{a i r} = \frac{80}{\frac{20}{3600} \times 43000}$

$η_{a i r} = 0.3348$

$η_{air} = 33.48 %$

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Basic Mechanical Engineering (3110006)

Q4) (b)

Determine the brake thermal efficiency of an engine with following data:Brake Power = 80 kW, Fuel consumption rate = 20 kg / hour, Calorific value of the fuel = 43 MJ / kg.

Questions

Go to Question Paper

Determine the brake thermal efficiency of an engine with following data:
Brake Power = 80 kW, Fuel consumption rate = 20 kg / hour, Calorific value of the fuel = 43 MJ / kg.