Volume Index

Good day

i want to be cleared the concept of Vi of screw compressors. some compressor have fixed and variable VI.
And they have calculated figures like 2.6 3.6
Some typical screw compressor Vi ratings are 2.6, 3.6 and 5.0. A low Vi (2.6) typically is used on booster applications while a high Vi (5.0) is used on high- or single-stage applications.
this calculation on which parameters reference calculated ?:confused:

Thank you all

Quote:

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Originally Posted by shaaf

Good day

i want to be cleared the concept of Vi of screw compressors. some compressor have fixed and variable VI.
And they have calculated figures like 2.6 3.6
Some typical screw compressor Vi ratings are 2.6, 3.6 and 5.0. A low Vi (2.6) typically is used on booster applications while a high Vi (5.0) is used on high- or single-stage applications.
this calculation on which parameters reference calculated ?:confused:

Thank you all

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Shaaf,
Some information links

https://nextcomp.ca/wp-content/uploa...er-Digital.pdf

https://mayekawa.com.au/494/wp-conte...Compressor.pdf

Shaaf,
Just to simplify & follow up what you said. Nh3 on Mycom screw in general.
Vi 5.8 single stage -33/35 deg C
Vi 2.6 booster -33/-10
Vi 3.6 booster -40/-10
Vi 2.6 -10/35

If machine 2.6 or 3.6 you would not notice much from my experience (Mycom).

Bigger differential across machine, higher Vi

Dear Ranger1

Thank you so much for your couple of replies. I'm grateful for this.