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1. Assignment- 1 [5]
A small scale hydroelectric power plant with head (60+x) feet, Flow rate = 400 Lt/min,
Efficiency = 0.90 and Gravity = 9.81 m/s2
. How much would be the yearly generation if operates
15 hours and 24 hours a day? Assuming no heat losses occurred and sensible heat storage is
used). (x=last digit of your student ID).
Assignment- 2 [5]
A (40+x) m diameter, three-bladed wind turbine produces (50+x) kW at a wind speed (hub
height) of 15 m/s. The air density is 1.204 kg/m3. [Here x=last digit of your student ID]. Find:
a. The rotational speed (rpm) of the rotor at a tip speed ratio of (x+3).
b. What is the tip speed (m/s)?
c. If the generator turns at (1300+x) rpm, what gear ratio is needed to match the rotor speed to
the generator speed?
d. What is the efficiency of the wind turbine system (including blades, transmission, shafts, and
generator) under these conditions?