Large centrifugal air compressor
Large centrifugal air compressor
(OP)
Sizing a large air-compressor (~870kW). This is the first air compressor calc I've done and I'm a little concerned that I've made an error.
Based on Vendor supplied test data for a centrifugal compressor (given compressor speed, inlet f/r, dens, suct pres, disch pres, suct Temp, disch temp, Z, k, and MW) ... I'm calculating a polytropic efficiency of about 39.6% and an isenotropic efficiency of about 38.3%. However, when I look up standard text books (eg C&R VI, Perry, Compressed air and gas data- Loomis ...) any graph they have shows polytropic efficiencies from about 60%-90% ... nothing like close to the range I am calculating for the test compressor.
Is it likely I have made an error, or is this just one damn inefficient machine?
Based on Vendor supplied test data for a centrifugal compressor (given compressor speed, inlet f/r, dens, suct pres, disch pres, suct Temp, disch temp, Z, k, and MW) ... I'm calculating a polytropic efficiency of about 39.6% and an isenotropic efficiency of about 38.3%. However, when I look up standard text books (eg C&R VI, Perry, Compressed air and gas data- Loomis ...) any graph they have shows polytropic efficiencies from about 60%-90% ... nothing like close to the range I am calculating for the test compressor.
Is it likely I have made an error, or is this just one damn inefficient machine?
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RE: Large centrifugal air compressor
RE: Large centrifugal air compressor
Read the Eng-Tips Site Policies at FAQ731-376
RE: Large centrifugal air compressor
Estimating Centrifugal Compressor Performance
Process Compressor Technology Volume 1 by Ronald P. Lapina
Published by Gulf Publishing Company Book Division
great reference and I think I bought it years ago through one of the McGraw Hill Engineer's Book Club offers.
RE: Large centrifugal air compressor
Read the Eng-Tips Site Policies at FAQ731-376