Overall Efficiency or Brake Thermal Efficiency using Brake Mean Effective Pressure Formula

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Brake Thermal Efficiency is defined as the ratio of the net work output of the engine to the energy input from the fuel, expressed as a percentage. Check FAQs

BTE = \frac{BMEP \cdot A \cdot L \cdot (\frac{N}{2}) \cdot N c}{m f \cdot CV \cdot 60}

BTE - Brake Thermal Efficiency?BMEP - Brake Mean Effective Pressure?A - Piston Area?L - Stroke of Piston?N - RPM?N_c - Number of Cylinders?m_f - Fuel Consumption Rate?CV - Calorific Value?

Overall Efficiency or Brake Thermal Efficiency using Brake Mean Effective Pressure Example

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Here is how the Overall Efficiency or Brake Thermal Efficiency using Brake Mean Effective Pressure equation looks like with Values.

Here is how the Overall Efficiency or Brake Thermal Efficiency using Brake Mean Effective Pressure equation looks like with Units.

Here is how the Overall Efficiency or Brake Thermal Efficiency using Brake Mean Effective Pressure equation looks like.

0.371 = \frac{4.76 \cdot 0.166 \cdot 600 \cdot (\frac{7000}{2}) \cdot 2}{0.355 \cdot 42000 \cdot 60}

0.371 = \frac{4.76Bar \cdot 0.166m² \cdot 600mm \cdot (\frac{7000rad/s}{2}) \cdot 2}{0.355kg/s \cdot 42000kJ/kg \cdot 60}

0.371 = \frac{4.76 \cdot 0.166 \cdot 600 \cdot (\frac{7000}{2}) \cdot 2}{0.355 \cdot 42000 \cdot 60}

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Overall Efficiency or Brake Thermal Efficiency using Brake Mean Effective Pressure Solution

Follow our step by step solution on how to calculate Overall Efficiency or Brake Thermal Efficiency using Brake Mean Effective Pressure?

FIRST Step Consider the formula

BTE = \frac{BMEP \cdot A \cdot L \cdot (\frac{N}{2}) \cdot N c}{m f \cdot CV \cdot 60}

Next Step Substitute values of Variables

∴

BTE = \frac{4.76Bar \cdot 0.166m² \cdot 600mm \cdot (\frac{7000rad/s}{2}) \cdot 2}{0.355kg/s \cdot 42000kJ/kg \cdot 60}

Next Step Convert Units

∴

BTE = \frac{476000Pa \cdot 0.166m² \cdot 0.6m \cdot (\frac{7000rad/s}{2}) \cdot 2}{0.355kg/s \cdot 4.2E+7J/kg \cdot 60}

Next Step Prepare to Evaluate

∴

BTE = \frac{476000 \cdot 0.166 \cdot 0.6 \cdot (\frac{7000}{2}) \cdot 2}{0.355 \cdot 4.2E+7 \cdot 60}

Next Step Evaluate

∴

BTE = 0.370967136150235

LAST Step Rounding Answer

∴

BTE = 0.371

Overall Efficiency or Brake Thermal Efficiency using Brake Mean Effective Pressure Formula Elements

Variables

Brake Thermal Efficiency

Brake Thermal Efficiency is defined as the ratio of the net work output of the engine to the energy input from the fuel, expressed as a percentage.

Symbol: BTE

Measurement: NAUnit: Unitless

Note: Value should be less than 1.

Brake Mean Effective Pressure

Brake Mean Effective Pressure is a measure of the average pressure exerted on the piston during the power stroke, and is calculated by dividing net work output of engine by the displacement volume.

Symbol: BMEP

Measurement: PressureUnit: Bar