## Combustion efficiency Solution

STEP 0: Pre-Calculation Summary
Formula Used
Combustion efficiency = Heat added by combustion per cycle/(Mass of fuel added per cycle*Heating value of the fuel)
ηc = Qin/(mf*QHV)
This formula uses 4 Variables
Variables Used
Combustion efficiency - Combustion efficiency is defined as the actual heat input to the theoretical heat input in the engine cylinder.
Heat added by combustion per cycle - (Measured in Joule per Kilogram) - 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.
Mass of fuel added per cycle - Mass of fuel added per cycle is defined as the fuel that gets combustible in one cycle.
Heating value of the fuel - (Measured in Joule per Kilogram) - Heating value of the fuel is defined as the chemical energy per unit mass of the fuel.
STEP 1: Convert Input(s) to Base Unit
Heat added by combustion per cycle: 150 Kilojoule per Kilogram --> 150000 Joule per Kilogram (Check conversion here)
Mass of fuel added per cycle: 0.005 --> No Conversion Required
Heating value of the fuel: 50000 Kilojoule per Kilogram --> 50000000 Joule per Kilogram (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
ηc = Qin/(mf*QHV) --> 150000/(0.005*50000000)
Evaluating ... ...
ηc = 0.6
STEP 3: Convert Result to Output's Unit
0.6 --> No Conversion Required
0.6 <-- Combustion efficiency
(Calculation completed in 00.016 seconds)
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## < 10+ For 4 Stroke Engine Calculators

Indicated Power of Four-stroke Engine

## Indicated Power of Four-stroke Engine

Formula
"IP" = ("k"*"MEP"*"L"*"A"*("N"))/(2)

Example
"0.001106kW"=("4"*"0.005kPa"*"8.8cm"*"30cm²"*("4000r/"min""))/(2)

Calculator
LaTeX
Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2)
Volumetric Efficiency for 4S engines

## Volumetric Efficiency for 4S engines

Formula
"VE" = ((2*"m"_{"af"})/("ρ"_{"a"}*"V"_{"s"}*("N")))*100

Example
"0.00179"=((2*"0.9kg/s")/("1.20kg/cm³"*"200cm³"*("4000r/"min"")))*100

Calculator
LaTeX
Volumetric Efficiency = ((2*Air Mass Flow Rate)/(Intake Air Density*Piston swept volume*(Engine Speed)))*100
Brake Mean Effective Pressure of 4S Engines given Brake power

## Brake Mean Effective Pressure of 4S Engines given Brake power

Formula
"P"_{"mb"} = (2*"BP")/("L"*"A"*("N"))

Example
"0.144686kPa"=(2*"0.008kW")/("8.8cm"*"30cm²"*("4000r/"min""))

Calculator
LaTeX
Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed))
Work done per cycle in ic engine

## Work done per cycle in ic engine

Formula
"W" = ("P"*"n"_{"R"})/"N"

Example
"0.4kJ"=("100kW"*"2")/"500"

Calculator
LaTeX
Work done per cycle in ic engine = (Indicated engine power*Crankshaft revolutions per power stroke)/Engine Speed in rpm
Fuel conversion efficiency

## Fuel conversion efficiency

Formula
"η"_{"f"} = "W"/("m"_{"f"}*"Q"_{"HV"})

Example
"0.4"="100kJ"/("0.005"*"50000kJ/kg")

Calculator
LaTeX
Fuel conversion efficiency = Work done per cycle in ic engine/(Mass of fuel added per cycle*Heating value of the fuel)
Combustion efficiency

## Combustion efficiency

Formula
"η"_{"c"} = "Q"_{"in"}/("m"_{"f"}*"Q"_{"HV"})

Example
"0.6"="150kJ/kg"/("0.005"*"50000kJ/kg")

Calculator
LaTeX
Combustion efficiency = Heat added by combustion per cycle/(Mass of fuel added per cycle*Heating value of the fuel)
Bmep given engine torque

## Bmep given engine torque

Formula
"Bmep" = (2*pi*"T"*"N")/"s"_{"p"}

Example
"81881.16Pa"=(2*pi*"140000N*mm"*"4000r/"min"")/"4.5m/s"

Calculator
LaTeX
Bmep = (2*pi*Engine torque*Engine Speed)/Mean Piston Speed
Thermal efficiency of IC engine

## Thermal efficiency of IC engine

Formula
"η"_{"th"} = "W"/"Q"_{"in"}

Example
"0.666667"="100kJ"/"150kJ/kg"

Calculator
LaTeX
Thermal efficiency of ic engine = Work done per cycle in ic engine/Heat added by combustion per cycle
Fuel conversion efficiency given thermal conversion efficiency

## Fuel conversion efficiency given thermal conversion efficiency

Formula
"η"_{"f"} = "η"_{"c"}*"η"_{"t"}

Example
"0.4"="0.80"*"0.50"

Calculator
LaTeX
Fuel conversion efficiency = Combustion efficiency*Thermal conversion efficiency
Horsepower of engine

## Horsepower of engine

Formula
"HP" = ("T"*"E"_{"rpm"})/5252

Example
"13.95732"=("140000N*mm"*"5000r/"min"")/5252

Calculator
LaTeX
Horsepower of engine = (Engine torque*Engine rpm)/5252

## Combustion efficiency Formula

Combustion efficiency = Heat added by combustion per cycle/(Mass of fuel added per cycle*Heating value of the fuel)
ηc = Qin/(mf*QHV)

## What is combustion efficiency?

Combustion efficiency is the rate at which an engine converts fuel into energy. Particularly with heavy fuels with high-energy densities — diesel, fuel oil, bunker fuel, etc. The combustion efficiency increases with increased excess air - until the heat loss in the excess air is larger than the heat provided by more efficient combustion.

## How to Calculate Combustion efficiency?

Combustion efficiency calculator uses Combustion efficiency = Heat added by combustion per cycle/(Mass of fuel added per cycle*Heating value of the fuel) to calculate 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 ηc symbol.

How to calculate Combustion efficiency using this online calculator? To use this online calculator for Combustion efficiency, enter Heat added by combustion per cycle (Qin), Mass of fuel added per cycle (mf) & Heating value of the fuel (QHV) and hit the calculate button. Here is how the Combustion efficiency calculation can be explained with given input values -> 0.6 = 150000/(0.005*50000000).

### FAQ

What is 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 and is represented as ηc = Qin/(mf*QHV) or Combustion efficiency = Heat added by combustion per cycle/(Mass of fuel added per cycle*Heating value of the fuel). 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, Mass of fuel added per cycle is defined as the fuel that gets combustible in one cycle & Heating value of the fuel is defined as the chemical energy per unit mass of the fuel.
How to calculate 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 is calculated using Combustion efficiency = Heat added by combustion per cycle/(Mass of fuel added per cycle*Heating value of the fuel). To calculate Combustion efficiency, you need Heat added by combustion per cycle (Qin), Mass of fuel added per cycle (mf) & Heating value of the fuel (QHV). With our tool, you need to enter the respective value for Heat added by combustion per cycle, Mass of fuel added per cycle & Heating value of the fuel and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
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