Thermal efficiency of IC engine Solution

STEP 0: Pre-Calculation Summary
Formula Used
Thermal efficiency of ic engine = Work done per cycle in ic engine/Heat added by combustion per cycle
ηth = W/Qin
This formula uses 3 Variables
Variables Used
Thermal efficiency of ic engine - Thermal efficiency of ic engine is defined as the ratio of work done per cycle to the actual heat input per cycle in ic engine.
Work done per cycle in ic engine - (Measured in Joule) - Work done per cycle in ic engine is defined as work done to push the piston downwards during the power stroke of the otto cycle in ic engine.
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.
STEP 1: Convert Input(s) to Base Unit
Work done per cycle in ic engine: 100 Kilojoule --> 100000 Joule (Check conversion here)
Heat added by combustion per cycle: 150 Kilojoule per Kilogram --> 150000 Joule per Kilogram (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
ηth = W/Qin --> 100000/150000
Evaluating ... ...
ηth = 0.666666666666667
STEP 3: Convert Result to Output's Unit
0.666666666666667 --> No Conversion Required
FINAL ANSWER
0.666666666666667 0.666667 <-- Thermal efficiency of ic engine
(Calculation completed in 00.004 seconds)

Credits

Created by Syed Adnan
Ramaiah University of Applied Sciences (RUAS), bangalore
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Verified by Anshika Arya
National Institute Of Technology (NIT), Hamirpur
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24 For 4 Stroke Engine Calculators

Volumetric efficiency of IC engine
Go Volumetric efficiency of IC engine = (Air Mass Flow Rate*Crankshaft revolutions per power stroke)/(Air density at intake*Theoretical volume of engine*Engine speed in rps)
Rate of heat conduction of engine wall
Go Rate of Heat Conduction of Engine Wall = ((-Thermal conductivity of material)*Surface Area of Engine Wall*Temperature Difference across Engine Wall)/Thickness of Engine Wall
Brake power measured with dynamo meter
Go Brake power measured with dynamo meter = (pi*Pulley diameter*(Engine speed in rps*60)*(Dead weight-Spring scale reading))/60
Indicated Power of Four-stroke Engine
Go Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2)
Volumetric Efficiency for 4S engines
Go Volumetric Efficiency = ((2*Air Mass Flow Rate)/(Air density at intake*Piston Swept Volume*(Engine Speed)))*100
Brake Mean Effective Pressure of 4S Engines given Brake power
Go Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed))
Work done per cycle in ic engine
Go Work done per cycle in ic engine = (Indicated engine power*Crankshaft revolutions per power stroke)/Engine Speed in rpm
Fuel conversion efficiency
Go Fuel conversion efficiency = Work done per cycle in ic engine/(Mass of fuel added per cycle*Heating value of the fuel)
Combustion efficiency
Go Combustion efficiency = Heat added by combustion per cycle/(Mass of fuel added per cycle*Heating value of the fuel)
Intake air mass of engine cylinder
Go Mass of air at intake = (Air Mass Flow Rate*Crankshaft revolutions per power stroke)/Engine Speed in rpm
Bmep given engine torque
Go Bmep = (2*pi*Engine Torque*Engine Speed)/Mean Piston Speed
Displaced volume in engine cylinder
Go Displaced volume = (Piston stroke*pi*(Engine cylinder bore in meter^2))/4
Intake air density
Go Air density at intake = Intake air pressure/([R]*Intake air temperature)
Thermal efficiency of IC engine
Go Thermal efficiency of ic engine = Work done per cycle in ic engine/Heat added by combustion per cycle
Volumetric efficiency of IC engine given actual volume of engine cylinder
Go Volumetric efficiency of IC engine = Actual volume of intake air/Theoretical volume of engine
Connecting rod length to crank radius ratio
Go Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine
Ratio of cylinder bore to piston stroke
Go Connecting rod length to crank radius ratio = Connecting rod length/Crank Radius of Engine
Total cylinder volume of IC engine
Go Total volume of an engine = Total number of cylinders*Total volume of engine cylinder
Fuel conversion efficiency given thermal conversion efficiency
Go Fuel conversion efficiency = Combustion efficiency*Thermal conversion efficiency
Frictional power of engine
Go Frictional power of engine = Indicated Power of Engine-Brake power of engine
Actual intake air volume per cylinder
Go Actual volume of intake air = Mass of air at intake/Air density at intake
Horsepower of engine
Go Horsepower of engine = (Engine Torque*Engine RPM)/5252
Indicated mean effective pressure given mechanical efficiency
Go Imep = Bmep/Mechanical efficiency of ic engine
Frictional mean effective pressure
Go Fmep = Imep-Bmep

Thermal efficiency of IC engine Formula

Thermal efficiency of ic engine = Work done per cycle in ic engine/Heat added by combustion per cycle
ηth = W/Qin

What is thermal efficiency of IC engine?

The thermal efficiency of the IC engine is the ratio of work output to heat supplied to the engine. It is the work done to push the piston downwards during the power stroke of the otto cycle in ic engine.

How to Calculate Thermal efficiency of IC engine?

Thermal efficiency of IC engine calculator uses Thermal efficiency of ic engine = Work done per cycle in ic engine/Heat added by combustion per cycle to calculate the Thermal efficiency of ic engine, The Thermal efficiency of IC engine formula is defined as the ratio of the work done to push the piston downwards during the power stroke of the otto cycle in ic engine. Thermal efficiency of ic engine is denoted by ηth symbol.

How to calculate Thermal efficiency of IC engine using this online calculator? To use this online calculator for Thermal efficiency of IC engine, enter Work done per cycle in ic engine (W) & Heat added by combustion per cycle (Qin) and hit the calculate button. Here is how the Thermal efficiency of IC engine calculation can be explained with given input values -> 0.666667 = 100000/150000.

FAQ

What is Thermal efficiency of IC engine?
The Thermal efficiency of IC engine formula is defined as the ratio of the work done to push the piston downwards during the power stroke of the otto cycle in ic engine and is represented as ηth = W/Qin or Thermal efficiency of ic engine = Work done per cycle in ic engine/Heat added by combustion per cycle. Work done per cycle in ic engine is defined as work done to push the piston downwards during the power stroke of the otto cycle in ic engine & 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.
How to calculate Thermal efficiency of IC engine?
The Thermal efficiency of IC engine formula is defined as the ratio of the work done to push the piston downwards during the power stroke of the otto cycle in ic engine is calculated using Thermal efficiency of ic engine = Work done per cycle in ic engine/Heat added by combustion per cycle. To calculate Thermal efficiency of IC engine, you need Work done per cycle in ic engine (W) & Heat added by combustion per cycle (Qin). With our tool, you need to enter the respective value for Work done per cycle in ic engine & Heat added by combustion per cycle 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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