Re: [Fwd: queries on compressor]

From: <Rakesh>
Date: Mon Nov 14 2005 - 01:44:00 EST

DEAR SIR
I AM NEW IN DESIGNING FIELD BUT AS MY TEXT BOOK SUGGESTS(IF I M WRONG PLZ CORRECT ME)
POWER CONSUME DOES NOT ONLY DEPEND UPON R.P.M AS THE FORMULA OF POWER IS WORK DONE IN UNIT TIME P=F*V
P=F*2*PI*R*N

IN PARTIAL LOAD CONDITION MOTOR THE VALUE OF F IS LESS THAN THE VALUE OF F (IN FULL LOAD CONDITION)
SO THE POWER CONSUME IS AUTOMATICALLY LESS.SO I DONT THINK WE NEED TO DO ANY EXTRA ARRANGEMENT
Rakesh Chandel
Design Engineering Centre
E&C Division
32 Shivaji Marg
New delhi -110015
Tel :51419636

              Paul Bowers
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                                                                    Subject
              11/12/2005 09:26          [PipingDesign] [Fwd: queries on
              PM                        compressor]


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Sir,
     I had a question :
      when we operate Reciprocating compressors we are either operating at a

certain fixed motor RPM. This allows for the rated capacity of Compressor. But if the demand flow rate is required in less quantity i.e. under part-load conditions it doesn't change the RPM accordingly so as to adjust to the desired flow rate. Hence it actually consumes the same power under low-load conditions as the peak-load conditions.

So, can we apply some VFD's for such systems which can adjust accordigly as the desired flow rate so that automatically RPM's vary and power consumed is comparatively less under part-load conditions.

Regards,
Anindya Mazumdar
Maxpro Department
United Phosphorus Limited
Unit-1,GIDC ,Ankleshwar

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