Screw air compressor flow conversion

The flow conversion of screw air compressors involves unit conversion and working condition correction. The following are the detailed conversion methods and formulas:

1. Basic unit conversion

1. cubic meters per minute (m³/min) and cubic feet per minute (CFM)
   • 1m³/min≈35.315CFM
   • 1CFM≈0.02832m³/min
2. Liters per second (L/s) and cubic meters per minute (m³/min)
   • 1L/s≈0.06m³/min
   • 1m³/min≈16.6667L/s
3. Other common units
   • 1m³/h=0.01667m³/min
   • 1L/min=0.001m³/min

2. Correction of working conditions

The flow rate will be affected by operating conditions such as temperature and pressure, and needs to be corrected through the gas state equation:

1. Temperature correction formula

Qactual​=Qstandard​⋅Tstandard​Tactual​​⋅pactual​pstandard​​

• Qstandard​: Flow rate under standard state (0℃, 1 atm)
• Tactual​,pactual​: Temperature (K) and pressure (atm) under actual working conditions
• Tstandard​=273.15K,pstandard​=1atm

2. Pressure correction formula

When pressure changes, flow needs to be corrected according to compression ratio:

Q1​=Q2​⋅(p2​p1​​)1/k⋅T2​T1​​

• Q1​,Q2​: Intake and exhaust end flow
• p1​,p2​: Intake and exhaust pressure (absolute pressure)
• T1​,T2​: Intake and exhaust temperature (K)
• k: Thermal insulation index (1.4 for air)

3. Comprehensive conversion examples

known conditions：

• Nominal flow of air compressor Qstandard​=4.5m³/min(Standard status)
• Actual working conditions: Temperature Tactual​=313K, pressure pactual​=1.1atm

Calculate actual flow：

Qactual​=4.5⋅273.15313​⋅1.11​≈4.92m³/min

4. Engineering application suggestions

1. Selection verification: According to the pressure and temperature required by the equipment, use the correction formula to reverse the required air compressor flow.
2. energy efficiency monitoring: Install temperature sensors and pressure transmitters to calculate mass flow in real time.
3. energy-saving renovation: Adjust the intake air volume through frequency conversion control to avoid waste of energy consumption caused by excessive compression.

conclusion: Screw air compressor flow conversion needs to be combined with unit conversion and working condition correction. In practical applications, it is recommended to optimize equipment selection and operation strategies through sensor data collection and efficiency analysis.