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For a condensing turbine
Steam flow rate = 6 MT/hr
Inlet steam 37.2 Kg/cm2g and 383 °C
Exhaust condensate 600 mmHg Vaccum and 50 °C (Hot well)
How to calculated power consumed by the turbine from above data?
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Condensing Turbines
Started by , Jun 27 2008 06:09 AM
5 replies to this topic
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#2
Art Montemayor
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Posted 27 June 2008 - 06:12 AM
Steam turbines don't CONSUME energy; they PRODUCE energy.
Are we talking about the same steam turbine application?
Are we talking about the same steam turbine application?
#3
Adriaan
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Posted 27 June 2008 - 03:38 PM
Actually mr. Montemayor <big grin> thanks to the laws of thermodynamics nothing can be 100 % efficient and when it comes to steam turbines .... heat loss, sealing steam loss, lubricating oil that heats up .... they DO consume energy.
Gpadamwar go to the main site and get the Excel steam and water energy plug-in, use that for your calculations. Pay attention to the units used though.
Gpadamwar go to the main site and get the Excel steam and water energy plug-in, use that for your calculations. Pay attention to the units used though.
#4
Padmakar Katre
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Posted 28 June 2008 - 01:15 AM
Dear,
You could find some technical papers which are free to download and which will help you.
http://www.powergene...lants/index.htm
Only what I know is as follow.
A 1 MW condensing turbine plant needs about 0.1 m3/s of cooling water.
As I never thought in this context as the net efficiency is always mentioned with product so I never bothered for calculating the energy consumption as the first thought which comes in mind when I recall turbines is the machine from which I get energy.
You could find some technical papers which are free to download and which will help you.
http://www.powergene...lants/index.htm
Only what I know is as follow.
A 1 MW condensing turbine plant needs about 0.1 m3/s of cooling water.
As I never thought in this context as the net efficiency is always mentioned with product so I never bothered for calculating the energy consumption as the first thought which comes in mind when I recall turbines is the machine from which I get energy.
#6
Guest_majster_*
Guest_majster_*
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Posted 29 June 2008 - 01:59 PM
Hi,
you can calculate input power of turbine with equation
Pin=m(h1-h2)
where
Pin...power input to turbine from steam
m... steam mass flow rate
h1...specific entalpy of steam (at 37.2 Kg/cm2g and 383 °C)
h2...specific entalpy of conedensate (at 600 mmHg Vaccum and 50 °C )
Specific entalpies can be calculated with computer programes, but I believe that the fastest way is to look in steam tables (in Perry's Chemical Engineerrs Handbook, many books on thermodynamics also contain steam tables).
With about equation you will be able to calculate power suplied by the steam, but this is not power that turbine will give awav as shaft work. To calculate energy that turbine gives away in form of mechanical energy you will need to know eficiency of turbine. If you do not know it I would suggest value of 80 to 90 %. Mehanical power of turbine equals efficiency times Pin.
Best regards
you can calculate input power of turbine with equation
Pin=m(h1-h2)
where
Pin...power input to turbine from steam
m... steam mass flow rate
h1...specific entalpy of steam (at 37.2 Kg/cm2g and 383 °C)
h2...specific entalpy of conedensate (at 600 mmHg Vaccum and 50 °C )
Specific entalpies can be calculated with computer programes, but I believe that the fastest way is to look in steam tables (in Perry's Chemical Engineerrs Handbook, many books on thermodynamics also contain steam tables).
With about equation you will be able to calculate power suplied by the steam, but this is not power that turbine will give awav as shaft work. To calculate energy that turbine gives away in form of mechanical energy you will need to know eficiency of turbine. If you do not know it I would suggest value of 80 to 90 %. Mehanical power of turbine equals efficiency times Pin.
Best regards
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