Air compressor efficiency
Mar 18, 2020
Volumetric efficiency is the ratio of the actual air volume of the compressor to the theoretical air volume, expressed as a percentage.
1.Compression efficiency is the ratio of the actual power required to compress a given amount of gas to the theoretical power. The theoretical power can be calculated according to isothermal working conditions or adiabatic working conditions. The corresponding compression efficiency can be determined and expressed as a percentage. For compressors driven by steam or internal combustion engines, mechanical efficiency refers to the ratio of the indicated work horsepower of the compressor to the braking horsepower on the shaft. In the case of motor-driven compressors, mechanical efficiency refers to the ratio of the indicated power in the compression cylinder to the shaft power of the compressor. Expressed as a percentage.
2. Overall efficiency
The overall efficiency is the sum of the compression efficiency and mechanical efficiency of the air compressor. Compressor shaft power (braking power) includes: gas compression work-indicating work, friction work Ni
Mechanical efficiency ηm = --------
Nad
Rough calculation: Nad = 1.634PjVm (k / k-1) [ε (k-1 / k) -1] Kw
N motor = N axis / η transmission, η transmission (belt: 0.92 ～ 0.98, gear: 0.97 ～ 0.99)
