CE 704 · Chapter 3
Hydropower Engineering past question
3.4 Methods of fixing installed capacity of a hydropower plant
A hydropower plant is planned to be designed in Nepalese river, where mean monthly flows for a typical year are as follows:
| Months | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| m³/s | 4.4 | 3.9 | 3.4 | 4.2 | 4.2 | 16.5 | 78.1 | 108.9 | 52.8 | 22.0 | 9.9 | 6.4 |
Other data pertaining to the plant are as follows: Design discharge = 18 m³/s; Full supply level = 2250 masl; Turbine centerline = 1650 masl; Dia of 4 km long tunnel = 3 m, f=0.014; Dia of 1 km long penstock = 2.2 m, f=0.012; Hydraulic efficiency = 95%, Turbine efficiency = 93%, Generator efficiency = 99%, Transformer efficiency = 99%. Considering only the frictional loss, (i) Compute installed capacity, primary and secondary energy to be produced from the power plant assuming that 10% of minimum monthly flow to be released downstream. What is the plant factor? [2+2+2+2] (ii) The developer is interested to develop a daily peaking reservoir for 4 hours. What will be the capacity of the reservoir to satisfy daily peaking requirement? [4]