FYP-MECHANICAL ENGINEERING-Study and fabrication of wave power plant using OWC

2. FYP
2nd
Defense
Nisar Ali Khan
1 3 8/BSME/F -1 1 ( A )
Muhammad
1 37/BSME/F -1 1 ( A )

3. Study & fabrication
of wave energy power plant
Using oscillating water
column(O.W.C) technique

4. • Renewable Energy
• To produce cost effective energy
• Environment friendly power production

5. What are waves ???

6. •Wave Energy formula
• wave size…fetch ,duration ,wind speed
• wave power formula

7. WAVE POWER EXTRACTION TECHNIQUES
•Pendulum system
• Wave Dragon System
•Salter’s Duck system
• Oscillating column of water system
etc

8. This system consists of a chamber built in
shoreline coast with the layout shown. The
motions of ocean/sea waves push an air pocket up
and down behind a breakwater. Then the air
passes through an air turbine. Next, when the
wave returns to the sea, an air depression will
circulate through the turbine in the opposite
sense. However, this turbine has been designed to
continue turning the same way irrespective of the
direction of the air flow.
Oscillating Water Column Technique

10. •there are very few moving parts;
•there are no moving parts in the water;
•the concept is adaptable and can be used on a range of
collector forms
•situated on the coastline, in the near shore region or
floating offshore;
• the use of an air turbine eliminates the need for
gearboxes;
• it is reliable;
• it is easy to maintain

11. Principle of Power Conversion

14. Calculations and Data analysis
P.E=mg*y(x, t)/2
P.E= wῤgy^2/2=wῤga^2/2.Sin^2(kx-ῳt)
We want to calculate the wave potential energy over one period. We
assume that waves are only function of x and independent of time, thus:
y(x,t)=y(x).so we have
dP.E.= 0.5wῤga^2sin^2(kx- ῳt)dx
P.E=∫dP.E= ∫1/2wῤga^2 sin^2(kx--ῳt)dx=1/2wῤga^2[1/2x-1/4sin^2(kx-
ῳt)]
For potential energy

15. we will get,
P.E.=1/4 w2wῤga^2
The total energy over one period is equal to the total potential energy:
K.E.= 1/4wῤga^2
Eventually, the total energy over one period will be
E=P.E.=K.E= ½ w ῤga^2
For kinetic energy
Energy density: Ewd= Ew/w= 1/2 w ῤga^2 (j/m^2)
Power: Pw= Ew/T (W)
Power density Pwd= Pw/w

16. The efficiency, will then be,
Efficiency= Pu/Pw
Pu= Power at the upper end of duct, Pw= wave
power
Wave Power Formula
V = d/t= /T
P =(gVLA)/2
P / L =gVA/2
wave power= 0.49*(Hs^2)*T
f=1/T
Pair= (p*A2*V2^3)/2
Power of turbine= 0.5* Pair

17. Wave power lies not in huge plants but in a
combination of on-shore generation and near-shore
generation (using different technology) focused on
meeting local or regional needs. If this system proves to
be economically possible, only 0.1% of the renewable
energy within the world's oceans could supply more
than five times the global demand for energy.