FormulaDen logo
FormulaDen.com
Search
Physics Chemistry Math Chemical Engineering Civil Electrical Electronics Electronics and Instrumentation Materials Science Mechanical Production Engineering Financial Health

Relative Efficiency Formula

Fx Copy
LaTeX Copy
The Relative Efficiency of an I.C. engine is the ratio of indicated thermal efficiency to the thermal efficiency of a theoretically reversible cycle. Check FAQs
ηr=(IDEηa)⋅100
ηr - Relative Efficiency?IDE - Indicated Thermal Efficiency?ηa - Air Standard Efficiency?

Relative Efficiency Example

With values
With units
Only example

Here is how the Relative Efficiency equation looks like with Values.

Here is how the Relative Efficiency equation looks like with Units.

Here is how the Relative Efficiency equation looks like.

8.4Edit=(0.42Edit5Edit)⋅100
Solution
Copy
Reset
Share
You are here -
HomeIcon Home » Category Physics » Category Mechanical » Category IC Engine » fx Relative Efficiency

Relative Efficiency Solution

Follow our step by step solution on how to calculate Relative Efficiency?

FIRST Step Consider the formula
ηr=(IDEηa)⋅100
Next Step Substitute values of Variables
∴ ηr=(0.425)⋅100
Next Step Prepare to Evaluate
∴ ηr=(0.425)⋅100
LAST Step Evaluate
∴ηr=8.4

Relative Efficiency Formula Elements

Variables
Relative Efficiency
The Relative Efficiency of an I.C. engine is the ratio of indicated thermal efficiency to the thermal efficiency of a theoretically reversible cycle.
Symbol: ηr
Measurement: NAUnit: Unitless
Note: Value should be between 0 to 100.
Formulas to find Relative EfficiencyOpen Variable
Indicated Thermal Efficiency
Indicated Thermal Efficiency is given by the ratio of indicated power generated by the engine to the power generated by the combustion of the fuel.
Symbol: IDE
Measurement: NAUnit: Unitless
Note: Value should be between 0 to 100.
Formulas to find Indicated Thermal EfficiencyOpen Variable
Air Standard Efficiency
Air Standard Efficiency (in %) is the efficiency of the engine using air as the working medium. This efficiency is often called ideal efficiency.
Symbol: ηa
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Formulas to find Air Standard EfficiencyOpen Variable

Other formulas in Important Formulas of Engine Dynamics category

​Go Brake Power given Mean Effective Pressure
BP=(Pmb⋅L⋅A⋅(N))
​Go Mechanical Efficiency of IC engine
ηm=(BPIP)⋅100
​Go Brake Power given Mechanical Efficiency
BP=(ηm100)⋅IP
​Go Indicated Power given Mechanical Efficiency
IP=BPηm100

How to Evaluate Relative Efficiency?

Relative Efficiency evaluator uses Relative Efficiency = (Indicated Thermal Efficiency/Air Standard Efficiency)*100 to evaluate the Relative Efficiency, The Relative Efficiency formula is defined as the ratio of indicated thermal efficiency and the air standard efficiency of an IC engine. Relative Efficiency is denoted by ηr symbol.

How to evaluate Relative Efficiency using this online evaluator? To use this online evaluator for Relative Efficiency, enter Indicated Thermal Efficiency (IDE) & Air Standard Efficiency (ηa) and hit the calculate button.

FAQs on Relative Efficiency

What is the formula to find Relative Efficiency?
The formula of Relative Efficiency is expressed as Relative Efficiency = (Indicated Thermal Efficiency/Air Standard Efficiency)*100. Here is an example- 0.84 = (0.42/5)*100.
How to calculate Relative Efficiency?
With Indicated Thermal Efficiency (IDE) & Air Standard Efficiency (ηa) we can find Relative Efficiency using the formula - Relative Efficiency = (Indicated Thermal Efficiency/Air Standard Efficiency)*100.
About | Contact | Disclaimer | Terms | Privacy Policy
© 2024. Developed & Maintained by softUsvista Inc.
Copied!