Frequently Asked Questions...
I need help with a theoretical steam rate calculation for a turbine.?
I am dropping 150# pound steam to a 50# header across a turbine.
The 150# pound and the 50# steams are saturated.
The enthalpies I have for each steam set are as follows:
150# H=1195.55 BTU/LB and 50# H=1179.03 BTU/LB
And so my delta H across the turbine is...⌂H=16.52 BTU/LB (Isentropic)
Using the formula from Cameron...TSR = 2545/⌂H (theoretical steam rate) The 2545 is the horsepower to BTU/hr conversion.
TSR = 154 LB/(HP*HR)
However, Cameron and other give the value as approximately...
TSR = 34.3 LB/(HP*HR)
Where did I go wrong? Thanks for the help
Answer:
EDITS*
You do have the proper enthalpies for the proposed conditions and the conversion factors are correct; however, - -
1 -You seldom* supply saturated steam to a turbine.
2- Theoretically, if you furnished saturated steam to a turbine, the discharge would NOT* be saturated, but of a very low "quality" and could* erode the blades (See #1).
3- Also if you went from saturated to saturated, the process would definitely* not be isentropic.
4- turbines are not 100% efficient
5- Direct Conversion factors don't tell the whole story regarding the actual process. *The first "TSR" shown is not a turbine sizing conversion, and not even a rating for anything specific, but is a general conversion factor with wide application. It could be applied to gas engines. The second "TSR" is intended for a standardized boiler rating and is definitely not a standard for rating steam turbines.
6*-The sizing of steam turbines is not a one page quickie.
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