Sizing Hydraulic Turbines

Over here the best option may be using different sizes but you will have to calculate and compare the economics etc over the long run of the two options under your conditions.

Out of curiosity: What is the difference in the initial and running costs of the systems?

Hello everybody:

Thanks Hendrik. I am not sure if I understand your question but, anyway, I send to you the following figures: according to the cashflow, with the arrangement of two turbines of 40 m³/s the energy produced is 73.503 MWh and the invoice is US$6,394.761. With turbines of 65 m³/s and 15 m³/s the energy produced is 75.461 MWh and the invoice is US$6,607.689.

At first glance, it looks OK but, I have the feeling that other considerations must be taken account. That is the reason to post my enquiry in this Forum.

Also please look at this thread,

http://cr4.globalspec.com/thread/26076/hydro-turbines

There are more threads about hydro-turbines and sizing -

I'll review as a professional engineer and professor only.

Please read my personal website and contact.

Good luck,

Stan

=====================

Prof. Stanislav Pejovic, Ph.D., P.Eng.

1411 - 300 Webb Drive

Mississauga, ON, L5B 3W3, Canada

Tel: 905-896-1253

Cell: 416-270-8126

E-mail: pejovics@asme.org

stan.pejovic@utoronto.ca

spejovic@ryerson.ca

Website: http://individual.utoronto.ca/StanPejovic

http://myelab.net/~cane/

It is always better to have two identical units from design, spares angle. It is better to have two units operating at head of 25m and unit discharge of 40 cumecs. The unit rating will be 8.5MW. I have enclosed the preliminary design calculations

However, if it is an irrigation project, depending on the irrigation discharge your consultant may have suggested having two units with discharge of 15 cumecs and 65 cumecs. However, this requires an indepth study. For a unit of 25m head and 15 cumecs, the unit capacity will be 3MW and for a unit of 25m head and 65 cumecs discharge, the unit rating will be 14MW

For such operating heads and unit capacities it is preferable to install horizontal tubular units with a speed increaser thereby decreasing the civil and E & M costs.

Please examine the possibility of installing identical turbines of 8.5MW capacity since the generating units, transformers, busducts, ODY equipments will be identical and you can save substantially on spares management. The equipment cost will also be lower since detailed Engineering will be done for 8.5MW capacity and not two different capacities

SAMUEL CHELLIAH

Hello everybody:

I want to give thanks to all for your valuable support.

Mr. Chelliah, I beg your pardon but, I am a little bit confused by the way the data of your calculations appear on my browser; I wonder if is it possible to view the table in a different manner?

Once again, thanks.

I'm very sorry for the late reply since I have been suddenly transferred to a remote generating station. If you give me your e mail address, I will forward the data sheet. My e mail address is samuel_chelliah@yahoo.co.in

SAMUEL CHELLIAH