Calculation of inflation volume
Thread Content
Our factory has an air compressor with a gas delivery rate of 60 M3 per minute and an outlet pressure of 0.8 MPA. We now plan to convert this compressor to use CO2. May I ask: 1. How much CO2 can it handle at most? ； 2. Does the compressor need to be modified?
1. For positive-displacement compressors, changes in the molar mass of the medium are independent of the pumping volume (or filling volume). The exhaust rate (m3/h) depends only on the compression ratio and the equipment design. So when using CO2, the inflation rate remains at 60 m3/min, but since CO2 is heavier than air, the mass flow rate in kg/min is different. 2. At the same time, after switching to CO2, dW work = PdV remains the same, so the current also stays unchanged.
Isn’t the air density roughly the same as that of carbon dioxide? There’s no need to calculate it.
Carbon dioxide has a molecular weight of 44, while air’s is 29; does this mean the power of the compressor needs to change?