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Developed by undergraduates, Department of Mechanical Engineering, Faculty of Engineering, University of Peradeniya
Introduction
Introduction
The Junkers Calorimeter is a laboratory device used to determine the calorific value of gaseous fuels.
It works on Junkers’ Principle:
“A known volume of gas is burned, and the heat produced is transferred with maximum efficiency to a continuously flowing stream of water. The rise in water temperature is then used to calculate the fuel’s calorific value.”
Main Parts
Main Parts
Burner - Burns the fuel gas.
Combustion Chamber - Place where burning happens.
Water Jacket -Surrounds the chamber and absorbs heat.
Gas Flow Meter - Measures the amount of gas used.
Thermometers -Show the water temperature at inlet and outlet.
Condensate Collector - Collects condensed water (for LCV).
Graduated Cylinder -Measures the condensed water volume.
Procedure
Procedure
1.The gas is generated by mixing petrol and water.
2.A fixed amount of gas is burned in the burner.
3.Water flows around the combustion chamber.
4.Heat from burning gas warms the water.
5.The temperature rise is measured.
6.Using these values, we calculate the Higher Calorific Value (HCV) and Lower Calorific Value (LCV).
Important Formulas
Important Formulas
Heat Given to Water
Heat Given to Water
Q=ρwVwCw(T2−T1)
Q=ρwVwCw(T2−T1)
ρw - Water density
Vw - Water volume
Cw- Specific heat of water
(T2−T1) - Water temperature rise
Higher Calorific Value (HCV)
HCV=[ρwVwCw(T2−T1)]/Vf
Vf - Volume of fuel gas used
Lower Calorific Value (LCV)
LCV=HCV -(msL /Vf)
ms -Mass of condensed water
L - Latent heat of water
Applications
Applications
To find the energy content of gases.
In engineering labs for experiments.
Helps design efficient heating systems.
Used in power plants and fuel testing.
Example Results
Gallery
Our Vision
Our Vision
Our vision is to promote energy efficiency through science and technology. We aim to make fuel testing simple, accurate, and practical so that industries and communities can understand the true value of energy resources. By using the Junkers Calorimeter, we seek to inspire sustainable practices and smarter energy use for a cleaner future.
Contact us
Contact us
We invite you to share your questions, insights, or collaboration ideas. If you’re interested in exploring the calorific value of fuels or enhancing this technology for modern applications, we’d love to hear from you.
Phone : +94 71 537 4753
email : e20021@eng.pdn.ac.lk
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