non adiabatic turbines

[nupinupi]

Hi there

I don't know if this relates to what you're discussing but I'd like to know if there is a way to estimate the loss of heat to its surroundings that a steam turbine might have as a result of deterioration. I mean, when a steam turbine is brand new, it can be considered adiabatic but when it's really old, I'm guessing that that quality is going to change significantly.

Is there any way I can estimate this loss with the usual data that I can get from the measuring equipment of the steam turbine? (i.e. discharge pressure of the steam, steam pressure at the turbine entry, steam temperature in and out of the turbine, steam flow to the turbine)

If this data isn't enough what else do I need to calculate this?

And finally, the data provided by the manufacturer about the steam consumption of the turbine given a certain power output remains valid even after years of the turbine's purchase and continous work?

Thank you.

 

[rmw]

First, heat loss to the surroundings is a function of the condition of the insulation and lagging of the turbine. Is yours deteriorated enough to cause you to ask this question.

The word "significantly" is a subjective term, but usually connotes 'by a large amount' in this context.

While any insulation can be expected to deteriorate over time, I doubt that the heat loss due to it is measurable by the parameters you list. It is reversable, however, in that the insulation can be renewed if it is required.

Regarding your last question, this is determinable by measuring the parameters you list. Compare the measurements of these parameters to those shown on the OEM's original heat balance, and you can calculate the deterioration due to age and wear.

Some good reading on topics that relate to this can be found at:

http://www.gepower.com/prod_serv/products/tech_docs/en/steam_turbines.htm

rmw