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Mechanical Efficiency of Diesel Engine Formula

GoMechanical Efficiency using Indicated Power and Friction Power Formula

GoMechanical Efficiency using Break Power and Friction Power Formula

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Mechanical Efficiency is measure of the effectiveness with which a mechanical system performs. Check FAQs

η m = \frac{P 4b}{P 4i}

η_m - Mechanical Efficiency?P_4b - Brake Power of 4 Stroke?P_4i - Indicated Power of 4 Stroke?

Mechanical Efficiency of Diesel Engine Example

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Here is how the Mechanical Efficiency of Diesel Engine equation looks like with Values.

Here is how the Mechanical Efficiency of Diesel Engine equation looks like with Units.

Here is how the Mechanical Efficiency of Diesel Engine equation looks like.

0.7331 = \frac{5537}{7553}

0.7331 = \frac{5537kW}{7553kW}

0.7331 = \frac{5537}{7553}

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Mechanical Efficiency of Diesel Engine Solution

Follow our step by step solution on how to calculate Mechanical Efficiency of Diesel Engine?

FIRST Step Consider the formula

η m = \frac{P 4b}{P 4i}

Next Step Substitute values of Variables

∴

η m = \frac{5537kW}{7553kW}

Next Step Convert Units

∴

η m = \frac{5.5E+6W}{7.6E+6W}

Next Step Prepare to Evaluate

∴

η m = \frac{5.5E+6}{7.6E+6}

Next Step Evaluate

∴

η m = 0.733086190917516

LAST Step Rounding Answer

∴

η m = 0.7331

Mechanical Efficiency of Diesel Engine Formula Elements

Variables

Mechanical Efficiency

Mechanical Efficiency is measure of the effectiveness with which a mechanical system performs.

Symbol: η_m

Measurement: NAUnit: Unitless

Note: Value should be less than 1.

Formulas to find Mechanical Efficiency

Brake Power of 4 Stroke

Brake Power of 4 Stroke is the output of the engine at the shaft measured by a dynamometer in a 4 stroke diesel engine.

Symbol: P_4b

Measurement: PowerUnit: kW

Note: Value should be greater than 0.

Formulas to find Brake Power of 4 Stroke

Indicated Power of 4 Stroke

Indicated Power of 4 Stroke is a measure of the power output of a 4 stroke diesel engine based on the pressure exerted on the piston during the combustion process.

Symbol: P_4i

Measurement: PowerUnit: kW

Note: Value should be greater than 0.

Formulas to find Indicated Power of 4 Stroke

Other Formulas to find Mechanical Efficiency

Go Mechanical Efficiency using Indicated Power and Friction Power

η m = \frac{P 4i - P f}{P 4i}

Go Mechanical Efficiency using Break Power and Friction Power

η m = \frac{P 4b}{P 4b + P f}

Other formulas in Diesel Engine Power Plant category

Go Area of Piston given Piston Bore

A = (\frac{π}{4}) \cdot B^{2}

Go Work Done per Cycle

W = IMEP \cdot A \cdot L

Go Indicated Power of 2 Stroke Engine

P i2 = \frac{IMEP \cdot A \cdot L \cdot N \cdot N c}{60}

Go Indicated Power of 4 Stroke Engine

P 4i = \frac{IMEP \cdot A \cdot L \cdot (\frac{N}{2}) \cdot N c}{60}

How to Evaluate Mechanical Efficiency of Diesel Engine?

Mechanical Efficiency of Diesel Engine evaluator uses Mechanical Efficiency = Brake Power of 4 Stroke/Indicated Power of 4 Stroke to evaluate the Mechanical Efficiency, The Mechanical Efficiency of Diesel Engine formula is defined as the ratio of its brake power to indicated power. It represents the efficiency of the engine's conversion of fuel energy into useful work output, and takes into account the losses due to friction, mechanical inefficiencies, and other factors. Mechanical Efficiency is denoted by η_m symbol.

How to evaluate Mechanical Efficiency of Diesel Engine using this online evaluator? To use this online evaluator for Mechanical Efficiency of Diesel Engine, enter Brake Power of 4 Stroke (P_4b) & Indicated Power of 4 Stroke (P_4i) and hit the calculate button.

FAQs on Mechanical Efficiency of Diesel Engine

What is the formula to find Mechanical Efficiency of Diesel Engine?

The formula of Mechanical Efficiency of Diesel Engine is expressed as Mechanical Efficiency = Brake Power of 4 Stroke/Indicated Power of 4 Stroke. Here is an example- 0.733086 = 5537000/7553000.

How to calculate Mechanical Efficiency of Diesel Engine?

With Brake Power of 4 Stroke (P_4b) & Indicated Power of 4 Stroke (P_4i) we can find Mechanical Efficiency of Diesel Engine using the formula - Mechanical Efficiency = Brake Power of 4 Stroke/Indicated Power of 4 Stroke.

What are the other ways to Calculate Mechanical Efficiency?

Here are the different ways to Calculate Mechanical Efficiency-

Mechanical Efficiency=(Indicated Power of 4 Stroke-Friction Power)/Indicated Power of 4 Stroke
Mechanical Efficiency=Brake Power of 4 Stroke/(Brake Power of 4 Stroke+Friction Power)

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