Principle
The Stirling engine is submitted to a load by means of an adjustable torquemeter, or by a coupled generator. Rotation frequency and temperature changes of the Stirling engine are observed. Effective mechanical energy and power, as well as effective electrical power, are assessed as a function of rotation frequency. The amount of energy converted to work per cycle can be determined with the assistance of the pV diagram. The efficiency of the Stirling engine can be estimated.
Tasks
1.Determination of the burners thermal efficiency
2.Calibration of the sensor unit.
3.Calculation of the total energy produced by the engine through determination of the cycle area on the oscilloscope screen, using transparent paper and coordinate paper.
4.Assessment of the mechanical work per revolution, and calculation of the mechanical power output as a function of the rotation frequency, with the assistance of the torque meter.
5.Assessment of the electric power output as a function of the rotation frequency.
6.Efficiency assessment.
What you can learn about
First and second law of thermodynamics
Reversible cycles
Isochoric and isothermal changes
Gas jaws
Efficiency
Stirling engine
Conversion of heat
Thermal pump
Materiallist Product Amount
Software Cobra3 Universal recorder 14504-61 1
Power supply 12V / 2A 12151-99 1
Cobra3 BASIC-UNIT, USB 12150-50 1
Adapter, BNC socket/4 mm plug pair 07542-27 2
Denaturated alcohol (spirit for burning), 1000 ml 31150-70 1
Thermocouple NiCr-Ni, sheathed 13615-01 2
Screened cable, BNC, l 750 mm 07542-11 2
Sensor unit pVn for Stirling engine 04371-00 1
Meter for Stirling engine, pVnT 04371-97 1
Torque meter 04372-02 1
Chimney for stirling engine 04372-04 1
Motor/ generator unit 04372-01 1
Stirling engine transparent 04372-00 1
