The air consumption of the equipment knows how to match the air compressor flow.

When the air consumption of the equipment is known, the following steps shall be followed to configure the air compressor flow (with calculation formula):

basic 1. calculation principles

1. flow matching formula

Q air compressor = & eta; total Q equipment of the system ×k allowance

• Q total equipment: sum of gas consumption of all equipment (m & sup3;/min)
• k margin: safety margin factor (recommended 1.1-1.3)
• & eta; system: system efficiency (piston machine takes 0.75, screw machine takes 0.85)

determination of key 2. parameters

1. statistics of equipment gas consumption
   • list all gas-using equipment, marking:
     • continuous gas consumption (e. g. cylinder action frequency converted to average flow)
     • peak gas consumption (e. g. instantaneous flow of pulse injection valve)
2. leakage estimation
   • estimated by system pressure:
     • 7bar system: leakage & asymp; Total flow of equipment × 8%
     • 4bar system: leakage & asymp; Total flow of equipment × 5%
3. multiple equipment linkage coefficient
   • when the number of equipment running at the same time is ≥ 3, the instantaneous flow rate shall be superimposed (it is recommended to multiply by 1.2-1.5)

3. Selection Example

scene: The total gas consumption of equipment in a factory is 12m & sup3;/min (including leakage), the system efficiency is 85%, and 15% safety margin is required.

1. Calculation of theoretical requirements

Q theory = 0.8512 × 1.15 & asymp;16.12m & sup3;/min

2. market model matching
   • select 16m & sup3;/min screw machine (considering standard model specifications)
   • or choose 2 8m & sup3;/min parallel units (improve reliability)

4. Advanced Optimization Recommendations

1. pressure classification
   • high-pressure equipment (e. g. bottle blowing machine) is equipped with booster separately
   • pressure reducing valve for low pressure equipment (e. g. instrument gas)
2. frequency conversion control
   • for systems with large fluctuations in gas consumption, select variable frequency air compressors to save more than 30% of energy.
3. Gas tank configuration
   • according to the air compressor flow rate of 10%-15%, configure the air storage tank (e.g. 16m & sup3;/min unit with 2m & sup3; tank)

note: The final selection should be combined with the power curve of the air compressor (the flow will decay under different pressures), and it is recommended that the compressed air system supplier provide the selection report.