Urgently need an expert: the formula for calculating the shaft power of a rotary compressor
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Our facility has a recirculating compressor with an average molecular weight of the gas of 11, a flow rate of 30 m³/min, an inlet pressure of 1.25 MPa, an outlet pressure of 1.47 MPa, and an inlet temperature of 60°C. What is the shaft power? After driving this time, the current gradually increased to 360A, which is already close to the rated value. Last time, when the vehicle was stopped, the pressure difference across the inlet and outlet was 0.2 MPa; with all other conditions remaining the same, the current was only 300A. Could some experts help calculate this?
The current increases gradually from 300A to 360A, and this clearly has little to do with the compressed medium; mechanical factors can be considered.
I want to use calculations to verify just how much the increase in pressure difference affects the current It is normal for the current to increase as the compression ratio of the compressor rises. However, it is not clear whether the increase in current is caused solely by an increased pressure difference, or if there is also a problem with the compressor itself I hope those with more experience can offer some guidance! Additionally, the compressor was checked and no issues were found.
Additional conditions: Exit temperature 85°C; Media: hydrogen, methane, ammonia; Total volume percentage: 38.00%, 24.00%, 38.00%, 100.00%
I came up with a calculation formula; it’s okay for my own use, but I’m afraid people will laugh at it if I share it.
Flow rate: 30 m³/minute, inlet pressure: 1.25 MPa, outlet pressure: 1.47 MPa, shaft power: 173.25 kW
Flow rate: 30 m³/minute, inlet pressure: 1.25 MPa, outlet pressure: 1.47 MPa. Shaft power: 173 kW, full-load current: 346