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Combustion efficiency Formula

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Combustion Efficiency is defined as the actual heat input to the theoretical heat input in the engine cylinder. Check FAQs

η c = \frac{Q in}{m f \cdot Q HV}

η_c - Combustion Efficiency?Q_in - Heat Added by Combustion per Cycle?m_f - Mass of Fuel Added per Cycle?Q_HV - Heating Value of the Fuel?

Combustion efficiency Example

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Here is how the Combustion efficiency equation looks like with Values.

Here is how the Combustion efficiency equation looks like with Units.

Here is how the Combustion efficiency equation looks like.

0.6 = \frac{150}{0.005 \cdot 50000}

0.6 = \frac{150kJ/kg}{0.005 \cdot 50000kJ/kg}

0.6 = \frac{150}{0.005 \cdot 50000}

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Combustion efficiency Solution

Follow our step by step solution on how to calculate Combustion efficiency?

FIRST Step Consider the formula

η c = \frac{Q in}{m f \cdot Q HV}

Next Step Substitute values of Variables

∴

η c = \frac{150kJ/kg}{0.005 \cdot 50000kJ/kg}

Next Step Convert Units

∴

η c = \frac{150000J/kg}{0.005 \cdot 5E+7J/kg}

Next Step Prepare to Evaluate

∴

η c = \frac{150000}{0.005 \cdot 5E+7}

LAST Step Evaluate

∴

η c = 0.6

Combustion efficiency Formula Elements

Variables

Combustion Efficiency

Combustion Efficiency is defined as the actual heat input to the theoretical heat input in the engine cylinder.

Symbol: η_c

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Combustion Efficiency

Heat Added by Combustion per Cycle

Heat added by combustion per cycle is defined as the amount of heat energy liberated from the combustion of the fuel in one working cycle.

Symbol: Q_in

Measurement: Heat of Combustion (per Mass)Unit: kJ/kg

Note: Value should be greater than 0.

Formulas to find Heat Added by Combustion per Cycle

Mass of Fuel Added per Cycle

Mass of Fuel Added per Cycle is defined as the fuel that gets combustible in one cycle.

Symbol: m_f

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Mass of Fuel Added per Cycle

Heating Value of the Fuel

Heating value of the fuel is defined as the chemical energy per unit mass of the fuel.

Symbol: Q_HV

Measurement: Heat of Combustion (per Mass)Unit: kJ/kg

Note: Value should be greater than 0.

Formulas to find Heating Value of the Fuel

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How to Evaluate Combustion efficiency?

Combustion efficiency evaluator uses Combustion Efficiency = Heat Added by Combustion per Cycle/(Mass of Fuel Added per Cycle*Heating Value of the Fuel) to evaluate the Combustion Efficiency, The Combustion efficiency formula is defined as a measure of how effectively the heat content of a fuel is transferred into usable heat. Combustion Efficiency is denoted by η_c symbol.

How to evaluate Combustion efficiency using this online evaluator? To use this online evaluator for Combustion efficiency, enter Heat Added by Combustion per Cycle (Q_in), Mass of Fuel Added per Cycle (m_f) & Heating Value of the Fuel (Q_HV) and hit the calculate button.

FAQs on Combustion efficiency

What is the formula to find Combustion efficiency?

The formula of Combustion efficiency is expressed as Combustion Efficiency = Heat Added by Combustion per Cycle/(Mass of Fuel Added per Cycle*Heating Value of the Fuel). Here is an example- 0.6 = 150000/(0.005*50000000).

How to calculate Combustion efficiency?

With Heat Added by Combustion per Cycle (Q_in), Mass of Fuel Added per Cycle (m_f) & Heating Value of the Fuel (Q_HV) we can find Combustion efficiency using the formula - Combustion Efficiency = Heat Added by Combustion per Cycle/(Mass of Fuel Added per Cycle*Heating Value of the Fuel).

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Combustion efficiency Formula

Combustion efficiency Example

Combustion efficiency Solution

Combustion efficiency Formula Elements

Other formulas in For 4 Stroke Engine category

How to Evaluate Combustion efficiency?

FAQs on Combustion efficiency

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