gas trapped in a reciprocating piston compressors clearance space expands at the beginning of the suction stroke what effect does this have on the system
When gas is trapped in the clearance space of a reciprocating piston compressor, it expands at the beginning of the suction stroke. This expansion has several effects on the system:
1. Reduced volumetric efficiency: The expansion of gas in the clearance space reduces the effective volume available for suction. As a result, the compressor's volumetric efficiency decreases because less gas can be drawn into the cylinder during the suction stroke.
2. Increased power consumption: The expansion of gas in the clearance space requires additional work from the compressor to compress the gas back to its original pressure. This increases the power consumption of the compressor, as more energy is required to compress the expanded gas.
3. Higher discharge temperature: The expansion of gas in the clearance space also results in a rise in the discharge temperature of the compressed gas. This is because the expansion causes an increase in the gas's internal energy, which is converted into heat. The higher discharge temperature may require additional cooling or affect the overall cooling system of the compressor.
4. Increased wear and tear: The expansion of gas in the clearance space causes pressure variations and impacts the sealing mechanism of the compressor. These pressure fluctuations can cause increased wear and tear on the piston rings and cylinder walls, leading to reduced efficiency and potential damage to the compressor components.
To mitigate the effects of gas expansion in the clearance space, the clearance volume can be minimized by proper design or by using clearance pockets. Additionally, regular maintenance and monitoring of the compressor's condition can help identify and address any issues caused by gas expansion.