On the air compressor selection catalog, is a flow rate of 0.6 m³/min specified under standard conditions or under 8 kg pressure?
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On the air compressor selection catalog, is a flow rate of 0.6 m³/min specified under standard conditions or under 8 kg pressure?
The flow rate indicated in the air compressor selection catalog generally refers to the flow rate under standard conditions, that is, at standard atmospheric pressure (1.01325 bar) and an air temperature of 20°C. Therefore, the flow rate of 0.6 m³/min also refers to the flow rate under standard conditions. .
N*m3/min at standard conditions
So if the exhaust pressure is 8 kg, would the flow rate be only around 1/8?
So if the exhaust pressure is 8 kg, would the flow rate be only around 1/8?
Yes, according to the principles of gas physics, at the same power and speed, as the exhaust pressure increases, the air density rises and the flow rate decreases. Therefore, when the exhaust pressure is 8 kg, the flow rate of the same air compressor will decrease significantly, with the actual flow rate being approximately 1/8 of the flow rate under standard conditions. .
By default, isothermal compression is assumed with PV/T = constant; in reality, it should be P1V1/(273+20) = P2V2/(273+75). The value of P2 is 0.9 MPa (absolute pressure), and the outlet temperature is 75°C, which needs to be converted to thermodynamic temperature. A ratio of 1/8 can be used as a default value, or approximately 1/7.5. A rough estimate is 1/8