Variable Speed Single Stage Air Compressor

The apparatus consists of a variable speed single stage Air Compressor which is driven by a thyristor controlled DC motor. It sucks air from inlet air tank through an orifice and air filter. Compressed air is stored in the air receiver. Delivery pressure gauge and temperature sensors are fitted. Energy meter is fitted to measure input to motor. These measurement equipment are provided to perform following experiments:
 Volumetric efficiency of compressor
 Compression ratio
 Isothermal efficiency
 Polytrophic index

 Compressor: Single stage air compressor Air cooled (with fins) of
- Cylinder bore : 50mm
- Stroke length : 100mm
- Max. Air pressure : 7 kg/cm2
- Air receiver of capacity : 300 pounds
With pressure relief valve and received drain cock.
 Motor: 2 HP, DC motor with thruster controlled to vary the speed.
 Measurements provided: Air inlet tank with air filter and orifice with U-tube water manometer for inlet air volume measurement orifice diameter = 12 mm.
 Multichannel digital temperature indicator for indicating temperature at various points.
 Energy meter for measurement of input to motor.
 Pressure gauge to deliver pressure.