Air compressor: A machine that compresses gas to increase its pressure or transports gas.
Functions: Gas blowing, refrigeration and separation, driving power, synthesis and polymerization, gas transportation, etc.
Applications: Industries such as electronics, automotive, steel, plastics, molds, hardware, pharmaceuticals, chemicals, food, beverages, furniture, printing, diving, fire protection, glass, environmental protection, biology, energy, ceramics, cement, mining, power plants, petrochemicals, shipbuilding, military, etc.
Common air compressor terminology:
Pressure: The discharge pressure usually given on the compressor nameplate is gauge pressure, not absolute pressure.
Common pressure units: bar, MPa. In the air compressor industry, "kilogram" refers to "bar," meaning 1 kilogram equals 1 bar. 1 MPa (megapascal) = 1000 kPa (kilopascal), 1 bar = 0.1 MPa.
Volumetric Flow Rate: Also known as discharge volume or nameplate flow rate in China, this is the volume of gas discharged by an air compressor per unit time, converted to the intake state, i.e., the intake volume. According to national standards, an air compressor is considered合格 (qualified) if its actual discharge volume is ±5% of the nominal flow rate.
Common Units: m³/min, L/s.
Oil Content in Gas: The mass of oil (including oil droplets, suspended particles, and oil vapor) contained in a unit volume of compressed air. PPM is usually a weight ratio unit: PPM, where one part per million of 1 kg is a milligram.
Pressure Dew Point: This refers to the temperature at which unsaturated water vapor in a gas under a certain pressure condenses into saturated water vapor and precipitates. Atmospheric dew point refers to the temperature at which unsaturated water vapor in a gas under standard atmospheric pressure condenses into saturated water vapor and precipitates. In the air compressor industry, dew point indicates the dryness of the gas.
Specific Power: This refers to the power consumed by the compressor per unit volumetric flow rate. It is an important indicator for evaluating the energy efficiency of compressors. The unit for specific power of an air compressor is KW/m³.
According to the standard GB19153-2009 "Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Positive Displacement Air Compressors," air compressor energy efficiency grades are divided into four levels:
Level 1 (Optimal Level), Level 2 (Energy Saving Evaluation Value), Level T (Target Energy Efficiency Limit), and Level 3 (Energy Efficiency Limit). Level 1 has the highest energy efficiency; production and sales of compressors below Level 3 are prohibited. Level T is the target energy efficiency limit, with energy efficiency superior to Level 3, and it replaced Level 3 energy efficiency values on December 1, 2013.
Level 1 reaches international advanced level, is the most energy-efficient, and has the lowest energy consumption;
Level 2 is relatively energy-efficient;
Level 3 has high energy consumption and is a market access indicator.
