Measurement Techniques Lab: The Stirling Engine: Process Engineering
1105 Words5 Pages
Measurement Techniques Laboratory
i. Contents Page ii
1. Introduction 3
2. Theoretical Background of Experiment 4
3. Application in Industry 5
4. Experimental Setup 6
5. Experimental Data and Analysis 8
6. Summary/Conclusions 10
7. References 11
Stirling engine, effiecny , thermal pump, gas jaws, isochoric, isothermal , conversion of heat ,first and second law of thermodynamics and reversible cycle.
The Stirling engine is an heat engine that operate the heat with the help of expansion and comparison of air and that happen in a different temperature and then the net of heat energy will be converted to a…show more content… Robert Stirling in Edinburgh, Scotland in 1816. And it’s really a famous engine .
For the thermodynamic cycle there are four stages to be considered in the p-v diagram and it is display the pressure and volume of the gas inside a Stirling engine change during a cycle see figure1 .
In phase 1 : isothermal expansion (T= constant) in this region the gas is heated with the help of external heat source (heat is supplied)
In phase 2 : isovoleumetric (isochoric) the gas is cooled and the volume is constant
In phase3 : isothermal compression the gas start to compress due to cooling (heat produced ) .
In phase 4 : isovolumetric (isochoric) gas is displaced to the hot end . And also we have to determine the efficacy .For determine the efficacy we can apply different equation :
Efficiency of heater
Application in Industry
In order to produce and generate the energy, the Stirling engine is used in many process in industry. And it works very affectively specially for the machines which needs a sustainable energy. It is used for solar applications and many other applications…show more content… Find the thermal power using
Thermal power = ∆m/∆t.h
Calibration of the motor
You have to deal on the unit , first you have to calibrate the temperature and to do that switch the unit in the pVnT meter you will see “call” so both thermocouples should have the same temperature but sometimes its not the case , in order to make the temperature equal use a water and inside that water but the both thermocouples and press calibration T. by calibrating the temperature sensor the temperature difference display zero.
You will see “OT” it will be displayed and that mean (upper dead center point). Now move the piston with the help of your hand and press “CALIBRATION V” ,wrong calibration will affect the p-v diagram .
Determination of the effective mechanical power
You will need to fix the scale of torque meter on the base plate , before you flywheel fix the inner metallic pieces on the axis . you will first start to measure without exterior load and without pointer.
When the Stirling motor run push the pointer onto the shaft. There will be different fraction between the pointer and the metallic pieces and that happen because of adjusting screw on the pointer . in each a adjustment you have to measure when the torque, rotation frequency and temperature remain