Steam Turbine Heat Balance
Steam Turbine Heat Balance
(OP)
Greedings everybody,
I am looking for a spreadsheet or other computer code to do a heat balance on a steam turbine. Does anyone have any idea where I can find one?
Thanks
I am looking for a spreadsheet or other computer code to do a heat balance on a steam turbine. Does anyone have any idea where I can find one?
Thanks





RE: Steam Turbine Heat Balance
If you are trying to do a LST then you are going to have to fork over the bucks for a Thermoflow or Gate Cycle or General Physics program and those aren't cheap.
rmw
RE: Steam Turbine Heat Balance
I am not sure I know what you mean by LST.
We are trying to do overall studies on the efficiency of our plant (6x30 MW, range system). Our main problem is lack of accurate flow measurement data, rather, unknown accuracy data.
Thanks
RE: Steam Turbine Heat Balance
RE: Steam Turbine Heat Balance
The use of your own excel table with steam properties may help, but if you do not have the correct procedure , I'm not sure where it will get you. The basis of most simulations of steam turbine performance was the ASME tech papers by Spencer and Cotton , published in the early 1960's. These include curves for predicting or correcting for leakages and expansion line end losses. The main precaution to using these old correlations is that they do not apply to newer LP turbine blades that were designed using 3d CFD and machined using 3d NC machines, in the case of predicting stage efficiency. But if you are only interested in computing test performance, it won't matter.
RE: Steam Turbine Heat Balance
RE: Steam Turbine Heat Balance
If you can measure the fuel consumed over a specific time period and know the heating value per unit of consumption, you can determine the Heat In.
Most power generating facilities include watt-hour meters for measuring power. These devices are inherently very accurate. If you count the revolutions of the meter over the same specific period of time, used for measuring fuel consumption, and apply a factor for the particular meter you can determine the average Power Out in kilowatts.
Using the Heat In and Power Out calculate the Heat Rate. Compare this measured heat rate to the original design value. In this way, Heat Rate may be determined for the entire plant or for individual units, depending on the plant configuration.
Divide the calculated Heat Rate into 3412.14 Btu/kW-hr (or 3600 kJ/kW-hr) and multiply by 100% to obtain the Thermal Efficiency. Again, compare this measured Thermal Efficiency to the original design value.
Unfortunately, this method will not point to components, which are not performing well.
Good luck with your study!
RE: Steam Turbine Heat Balance
RE: Steam Turbine Heat Balance
Superficially at least these methods seem to require information about the turbines that may only be available to the supplier. There is also the complication that the predictions are applicable to 60Hz systems and do not appear to give any guidance for 50Hz systems.
For a very simple steam turbine the following link may be useful.
http://www.sugartech.co.za/turbinecalcs/index.php
athomas236
RE: Steam Turbine Heat Balance
athomas236