Re: Power Efficiency Calculation
A bit off topic, though have a look here as a start:
http://en.wikipedia.org/wiki/Rankinecycle
Regards,
Lyle ■
Re: Power Efficiency Calculation
You seem to be looking for the net heat rate which will depend on the turbine auxilliaries as much as the turbine itself. This situation puts you firmly at the manufacturers' discretion unless you have in-house facilites to analyse the turbine geometry etc.
The easiest way is to compare the results from the different manufacturers websites where you will be able to find little interactive dialogue boxes which ask you for the superheat & flow data & then pump out a power figure; or vice versa. .
I've used them to evaluate waste steam utilisation & never bothered about their accuracy on the understanding 'like for like'. When I used them the dialogue didn't offer reheat stage selection etc. See if does nowadays. Good luck.
For guidance the net heat rate should be around 10,000Btu/kWh & nobody apologises for the mixed units because General Electric et al were forced into them because nobody on dry land used shaft horsepower. ■
Re: Power Efficiency Calculation
Sir thanks for your concious reply.
I am inclined to believe you concievably to undersatnd the geomatry of turbine before arriving at optimum value.
But may unanswered quiry again caught me to have a interaction withyou that
What is a practical formula to calculate the output in MW or KW for a given parameter
1) Steam flow lb/hr
2) Pressure of steam
3) Efficiency of turbine
Probably theoratically formula may not include some of the accentuated consideration , which could result in mileading us.
rahul ■
Re: Power Efficiency Calculation
Skipping back to thermo from uni (my recollection may not be perfect):
1. You state you have the steam property - pressure. You will also need to know temperature. You will need this as the turbine inlet and outlet (condenser?). These are probably "key" contract values and should be readily available.
2. Using the values listed in 1. refer thermodynamic properties of steam (such as Mollier diagram or steam tables, see here as a start:http://www.google.com.au/imgres?imgu...&ct=image&cd=1) to determine enthalpy at inlet and outlet.
3. Pout=massflow*delta enthalpy*efficiency
This assume single stage (would seem unlikely) / no reheat and no feedheaters etc.
This is provided in other words in the link provided earlier.
Regards,
Lyle ■
Brass Air Fittings
Now that is a lot of brass air fittings http://www.liangdianup.com/subpages/airfitting1.htm there is just about every type
of air fitting that you could want. Wholesale prices too. I guess these could be used as small water pipe fitting also. I
used some of the parts to make my babington wvo burner. ■
Re: Power Efficiency Calculation
1. You state you have the steam property - pressure. You will also need to know temperature. You will need this as the turbine inlet and outlet (condenser?). These are probably "key" contract values and should be readily available.
2. Using the values listed in 1. refer thermodynamic properties of steam (such as Mollier diagram or steam tables, see here as a start:http://www.google.com.au/imgres?imgu...&ct=image&cd=1) to determine enthalpy at inlet and outlet.
3. Pout=massflow*delta enthalpy*efficiency
This assume single stage (would seem unlikely) / no reheat and no feedheaters etc.
This is provided in other words in the link provided earlier.
Regards,
Lyle
Dear Lyle
My objective is to calcualte the outlet power for the given parameter
ie steam flow , steam pressure and afcorse we have to consider theRPM of turbine to calculate the power
But what is the actulal formula
Thanks for your being so understanding
Rahul ■
Re: Power Efficiency Calculation
Refer equation 3 above.
I am not sure how I can provide additional detail.
Maybe some local assistance would assist?
Regards,
Lyle ■
Steaming Up
There is an ambiguity behind the question. Either you are trying to estimate the power acheivable from your waste process steam or you are trying to reconcile the performance of a turbine in service. Whatever.
Both scenarios are reliant on the turbine manufacturer. Large scale test facilities are available to verify the turbine performance before shipment & test witnessing is an integral part of the professional engineering process for procurement of any serious rotating equipment. If you ignore test witness procedures or furnish an ill considered purchase order then you are, I'll say it again, relying on the manufacturer for your mythical efficiency value.
Persistent requests for magic formulae will not bear fruit. There are no such equations.
What has turbine rpm got to do with power from steam at given conditions?
This one really needs knocking on the head, right now: it's off topic & only promises a proliferation of attempted confusion. ■
Power Efficiency Calculation
Dear sir
Can can anybody tell me how to calculate the power generation from given input
1) Steam flow lb/hr
2) Pressure of steam
3) Efficiency of turbine
Reason why iam asking, i want to traceout the resonancy of our exact power output with what vendor offers
rahul ■