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How to calculate the air output of air compressor

2026-04-14Views:

The calculation of the air output of the air compressor involves many factors, including the theoretical air output and the actual air output. The following is a detailed summary of the calculation method of air compressor output:

calculation of 1. theoretical gas output

the theoretical gas output refers to the theoretical value calculated according to the adiabatic process under the ideal conditions of no friction, no leakage and no temperature rise. Its calculation formula is:

  • Vt = V1 × (P2 / P1) × (T1 / T2)

among them:

  • Vt is the theoretical gas output
  • V1 is the volume before entering the compression chamber
  • P1 is the absolute pressure before entering the compression chamber
  • P2 is the absolute pressure after entering the gas tank
  • T1 is the absolute temperature before entering the compression chamber
  • T2 is the absolute temperature after entering the gas tank

calculation of actual air output of 2.

The actual gas output refers to the actual value obtained by testing under actual working conditions. The actual gas output is affected by many factors, including air leakage and fluctuation of gas consumption of gas equipment. Therefore, the actual gas output usually needs to be determined by actual tests or estimated by empirical formulas.

3. empirical formula estimation

in some specific occasions, the empirical formula can be used to estimate the air output of the air compressor. For example, in the field of pneumatic tools, sandblasting, dusting, spraying, etc., the spray volume of the nozzle directly determines the output of the air compressor. At this point, the following empirical formula can be used for estimation:

  • Q = 9.11 × d² × (P 1)

among them:

  • Q is the injection volume of the nozzle (air supply volume of the air compressor L/min)
  • d is the diameter of the nozzle (mm)
  • P is gauge pressure (bar)
  • P 1 is absolute pressure (bar)

this empirical formula is not only applicable to integer nozzle size and standard pressure, but also applicable to non-integer calculation. By inputting the diameter of the nozzle and the working pressure, the air output of the air compressor can be quickly estimated.

4. considerations

  1. when calculating the air output of the air compressor, it is necessary to clarify the work requirements and select the appropriate air compressor model and specifications. Air compressors of different models and specifications have different displacement and power, and need to be selected according to actual needs.
  2. The actual gas output may be affected by many factors, such as air leakage, gas consumption fluctuations of gas equipment, etc. Therefore, when calculating the actual gas output, it is necessary to consider these influencing factors and make appropriate corrections.
  3. For occasions where the amount of gas needs to be accurately calculated, it is recommended to conduct actual tests to obtain accurate data. At the same time, you can also consult the air compressor manufacturer or professionals for more detailed calculations and selection recommendations.

In summary, the calculation of the air output of the air compressor involves many aspects and factors, and it is necessary to select the appropriate calculation method and formula according to the specific situation.

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