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Brake Thermal Efficiency Formula

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Brake Thermal Efficiency (in %) is defined as the brake power of a heat engine as a function of the thermal input from the fuel. Check FAQs

η bth = \frac{BP}{Q}

η_bth - Brake Thermal Efficiency?BP - Brake Power?Q - Heat Energy?

Brake Thermal Efficiency Example

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Here is how the Brake Thermal Efficiency equation looks like with Values.

Here is how the Brake Thermal Efficiency equation looks like with Units.

Here is how the Brake Thermal Efficiency equation looks like.

45.2381 = \frac{190}{4200}

45.2381 = \frac{190kW}{4200J}

45.2381 = \frac{190}{4200}

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Brake Thermal Efficiency Solution

Follow our step by step solution on how to calculate Brake Thermal Efficiency?

FIRST Step Consider the formula

η bth = \frac{BP}{Q}

Next Step Substitute values of Variables

∴

η bth = \frac{190kW}{4200J}

Next Step Convert Units

∴

η bth = \frac{190000W}{4200J}

Next Step Prepare to Evaluate

∴

η bth = \frac{190000}{4200}

Next Step Evaluate

∴

η bth = 45.2380952380952

LAST Step Rounding Answer

∴

η bth = 45.2381

Brake Thermal Efficiency Formula Elements

Variables

Brake Thermal Efficiency

Brake Thermal Efficiency (in %) is defined as the brake power of a heat engine as a function of the thermal input from the fuel.

Symbol: η_bth

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 100.

Formulas to find Brake Thermal Efficiency

Brake Power

Brake Power is the power obtained at the engine flywheel and is measured with the help of a dynamometer.

Symbol: BP

Measurement: PowerUnit: kW

Note: Value should be greater than 0.

Formulas to find Brake Power

Heat Energy

Heat Energy is the amount of total heat required.

Symbol: Q

Measurement: EnergyUnit: J

Note: Value should be greater than 0.

Formulas to find Heat Energy

Other formulas in Thermal Efficiency category

Go Brayton Cycle Efficiency

BCE = 1 - \frac{1}{{r p}^{\frac{Y - 1}{Y}}}

Go Carnot Cycle Efficiency of Heat Engine using Temperature of Source and Sink

n' = 1 - \frac{T i}{T f}

Go Compressor Efficiency

CE = \frac{KE}{W}

Go Cooled Compressor Efficiency

CCE = \frac{KE}{W}

How to Evaluate Brake Thermal Efficiency?

Brake Thermal Efficiency evaluator uses Brake Thermal Efficiency = Brake Power/Heat Energy to evaluate the Brake Thermal Efficiency, Brake Thermal Efficiency is defined as break power of a heat engine as a function of the thermal input from the fuel. Brake Thermal Efficiency is denoted by η_bth symbol.

How to evaluate Brake Thermal Efficiency using this online evaluator? To use this online evaluator for Brake Thermal Efficiency, enter Brake Power (BP) & Heat Energy (Q) and hit the calculate button.

FAQs on Brake Thermal Efficiency

What is the formula to find Brake Thermal Efficiency?

The formula of Brake Thermal Efficiency is expressed as Brake Thermal Efficiency = Brake Power/Heat Energy. Here is an example- 45.2381 = 190000/4200.

How to calculate Brake Thermal Efficiency?

With Brake Power (BP) & Heat Energy (Q) we can find Brake Thermal Efficiency using the formula - Brake Thermal Efficiency = Brake Power/Heat Energy.

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