Regarding the compressor displacement issue
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There is a propane compressor in the workshop; the specified processing capacity of this equipment is 12.5 standard cubic meters per minute. However, there is a problem: the data related to this compressor show that the motor speed is 495 revolutions per minute, the inlet pressure is 0–0.02 MPa, the diameter of the first cylinder is 320 mm, and the stroke of the first cylinder is 240 mm. The theoretical processing capacity I calculated is only 9.55 cubic meters per minute; I’m not sure what the problem is Please ask an expert to answer. I’m not an expert in equipment either, so I was wondering: should the processing capacity calculated based on speed and cylinder volume be higher than the actual processing capacity? Stop making fun of me; my questions might be a bit basic.
The cylinder is double-acting, right? The original poster has made a mistake in their calculation
Double-acting? Does that mean that for one rotation of the motor shaft, the cylinder completes two suction and exhaust cycles?
What you have calculated is the volume of the gas in its imported state; to obtain the value in standard cubic feet, it is necessary to use the gas equation of state to convert it to the volume of the gas at 20 degrees Celsius and 1 atmosphere of pressure
It’s not that issue; the intake pressure is 0.01 MPa, and this pressure has little impact on the conversion factor. Even after conversion, the value still does not reach 12.5
There is still space at the top of the cylinder, so you can’t simply calculate the cylinder volume; check the equipment’s structural diagram to see
At an intake pressure of 0.02, a value of 12.5 can be achieved; of course, when the intake pressure decreases, the processing capacity cannot reach the rated level
One suction and exhaust per cycle on the cylinder head side, one suction and exhaust per cycle on the cylinder block side
Today I opened the first cylinder of the compressor; it is indeed a double-acting type, so there’s no problem. The theoretical exhaust volume should be 19, while the actual exhaust volume is 12.5
Here, one more question. The reciprocating compressor is specified to have an exhaust volume of 12.5. Should this exhaust volume be achieved during actual operation?
It cannot be achieved, as the compressor’s clearance volume affects the air volume.