selection of turbine

[simatic7]

Hi
I was given the responsibility of choosing turbine for a hydropower of 3 MW and we asked turbine manufacturer to supply the turbine with their preliminary specfication .They provided two turine with following spec
option-1 option-2
Head 135 135 m
discharge 3 m3/s 3 m3/s
Rated ouptput 3 MW 3 MW
type of machine Francis Pelton vertical
dia of runner 636 mm 1070 mm
regulation type 16 guide vanes 6 nozzle
genertor speed 1000 rpm 428.6
efficiency
100% load 91.8 89.1%
90% load 93.5 90.0
80% load 93.0 90.4
70% load 91.4 90.5

now the question is which turbine is better or which one should I prefer to choose.
Please suggest
regards

 

[Artisi]

Option 1 based on its efficiency, this will equate to a massive saving on power costs over the life of the unit.

 

[racookpe1978]

Well, I would completely agree with Artisi = Go with the higher efficiency turbine! Absolutely. Even if costs were a little higher, the better efficiency will be more profitable faster.

However, I would point out that rather than a "a massive saving on power costs over the life of the unit" the higher efficiency will mean more power produced with less water needed over the life of the unit. Hydro power units, after all, have only maintenance and operator expenses to pay off.

Equally, or more importantly in times of drought or low flow, a higher efficiency unit will mean your rated power can be produced more often with less water used than a low efficiency unit every day of the year, thus insuring your turbine can produce more power longer through the year for the same water flow.

 

[arunmrao]

You might also need to factor in for the seasonal variations in storage capacity and head . These factors have influenced operations. also the silt level and any near source of silt generation need to be considered. Replacement costs shoot up.


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- Andy McIntyre


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[simatic7]

thanks a lot for your kind suggestion. I also suggested as you guys (helpful experts) but I felt I must take the suggestion from the experts also.
Once again thanks a lot to all of you for your valuable and kind suggestions and expect the same in future also