Compressor work
Compressor work
(OP)
I am having trouble calculating the work done by compressor. I basically have temperature (degree Celsius) and pressure (bara) data at the suction and discharge of the compressor which is obtained by doing the experiment. Average suction temp and pressure is 40 deg Celsius and 1 bara. Average discharge temp and pressure is 60 degree Celsius and 12 bara. When I use the thermodynamics table to get the enthalpies and find the work done by compressor my result is close to one or negative. Kindly help me to figure out what I am doing wrong.





RE: Compressor work
Dejan IVANOVIC
Process Engineer, MSChE
RE: Compressor work
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: Compressor work
remember the thing that doesn't change form one side of the compressor to the other is mass.
Hence 1 kg of something (you don't say what you are compressing) at 60C and 12 bara vs 1 kg of something at 40C and 1 bara simply must have a higher stored energy caused by the compressor.
How you account for the energy in the pressure side of it might be your issue?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Compressor work
If you've got an oil flooded compressor (with 1 or 2 stages), you have to add the oil cooler heat rejection duty to the dH gained from compressor suction to discharge to get to total compressor shaft power.
Power delivered by the motor driver would be the sum of the above plus any other driven ancillaries plus other losses.
RE: Compressor work