Screw compressors intermediate pressure estimation
Screw compressors intermediate pressure estimation
(OP)
Hello,
I'm trying to create an excel sheet where I can simulate screw compressor but I can't understand how to estimate intermediate pressure.
I've tried using pi=(p1*p2)^.5 with no results.
I've also tried using intermediate Vi without success.
pi=p1*Vi^k
The situation gets worse if I try with partial load where intermediate pressure is close to suction pressure (because of slide valve opening).
Is there any equation???
Thanks in advance
I'm trying to create an excel sheet where I can simulate screw compressor but I can't understand how to estimate intermediate pressure.
I've tried using pi=(p1*p2)^.5 with no results.
I've also tried using intermediate Vi without success.
pi=p1*Vi^k
The situation gets worse if I try with partial load where intermediate pressure is close to suction pressure (because of slide valve opening).
Is there any equation???
Thanks in advance





RE: Screw compressors intermediate pressure estimation
RE: Screw compressors intermediate pressure estimation
Those books are too expensive... and I only want the equation...
Using compressor manufacturer' software I drawn two diagram:
- suction pressure (x) vs intermediate (y)
- discharge pressure (x) vs intermediate (y)
and in both of them I found that intermediate pressure is linearly dependent on them...
I think that the equation could be
pi = a*p1 + b*p2 +c
The drawing shows that a>>b,
but I have no idea on their values,
and I have no interpretation of real mechanism...
Bye