1. Prof Dr / Osama Ezzat Abd ElLatif
Benha University
Shoubra Faculty of Engineering
Wind Cube Project
Supervised by :
Prof Dr / Osama Ezzat Abd ElLatif
Assistant Professor / Eng.Amgad
Executors :
1.Mahmoud Hussein Mahmoud
2.Eslam Mohamed Awad
3.Mahmoud Khairy Elshafei

2. Wind Cube  Construction & Blade Design  Simulation of The Project
 Results & Future Modification

3. Introduction Renewable energy:
is energy which comes from natural resources
Renewable energy can be used again and again, and will never run out
About 16% of global final energy consumption comes from renewable , with 10% coming from traditional biomass , and 3.4% from hydroelectricity , New renewable (small hydro, modern biomass, wind, solar, geothermal, and biofuel) accounted for another 3% and are growing very rapidly.

5. The types of renewable sources of energy :-
1- Hydropower
Hydro-power is the capture of the energy of moving water to generate electric power.

6. 2- Tidal power 3- Solar energy:- Is a form of hydropower
 that converts the energy
of tides to generate electricity
3- Solar energy:-
A solar cell, or photovoltaic cell (PV),
is a device that converts light
into electric current using
the photoelectric effect. 

7. Biomass, as a renewable energy
source, is biological material
 from living, or recently
living organisms. 
5- Geothermal energy
Geothermal energy is thermal energy
generated and stored in the Earth.

8. 6- Wind power
Wind energy is energy collected from motion caused by heavy winds.
wind blows and turn the motion of the propeller into energy that can be used in the electrical grid.

9. Advantages of wind power:-
clean fuel source.
don't produce atmospheric emissions
relies on the renewable power of the wind
lowest running priced renewable energy technologies
 can be built on farms or ranches
where most of the best wind sites are found

10. Why Wind Cube ?? Can be installed and operational quickly
Scalability (install one now and others later)
Easier to maintain than large wind turbines (all components easily accessible)
Unique design increases power generation
Smaller footprint
 No land needed

11. Construction
Main parts:  up-frame
Nozzle
 Generator chair:

12. The base:
The base designed to bear the up-frame and the generator chair and also have the availability of rotation (as wind direction is variable).

13. blade design Types Of Blades :  3. Savonius wind turbine
 1.Horizontal-Axis Wind Turbines:
are wind turbines whose axis
of rotation is parallel to the ground.
 2.Vertical-Axis Wind Turbines:
. They have rotor blades that
spin parallel to the ground
 3. Savonius wind turbine
 4. Giromill:
 5.Darrieus wind turbine :

14. Differences between VAWT & HAWT :  Installation:
 Coefficient of wind power use :
Theoretically proved that the coefficient of wind power use of ideal wind rotor (wheel) of any wind turbine (both HAWT and VAWT) is It can be explained by the fact that rotors of both turbine types use the same effect of lifting force appearing when the wind is flowing around the profiled blade. The maximum coefficient of wind energy use on HAWT has reached 0.4 recently. 
 START OF OPERATING (SELF START)

15. DESIGN OF BLADE:  SWEPT AREA ON THE UNIT OF BLADE LENGTH :
is the area of circle made by rotating blade ends.
 HIGH-SPEED DEGREE:
HAWTs, are the high-speed turbines (up to 5-7 modules), with less than 4 blades. 
Vertical Axis
the high-speed didn’t increase 2.5 – 2.8 modules
 Maintenance:
For the same reason as above, VAWTs are easier to maintain since most of them are installed near the ground.
HAWTs should also be checked constantly so that it faces against the wind, unlike VAWTs which require less maintenance. Automatic yaw-adjustment mechanisms have eliminated this need of constant maintenance on HAWTs though

16. Advantages of vertical wind turbines
Easier to maintain
 have a higher airfoil pitch angle, giving improved aerodynamics while decreasing drag at low and high pressures
 can be much easier to transport and install. 
 Does not need a free standing tower
Disadvantages of vertical wind turbines
 produce energy at only 50% of the efficiency of HAWTs
 installed on a relatively flat piece of land
 Most VAWTs have low starting torque. 

17. Advantages of horizontal wind turbines
 stable. 
Ability to wing warp, which gives the turbine blades the best angle of attack.
 Ability to pitch the rotor blades in a storm, to minimize damage. 
Tall tower allows access to stronger
 Can be cheaper
Disadvantages of horizontal wind turbines :
--> difficulty operating in near ground
 difficult to transport on the sea and on land
 Increase In Turbine Price

21. Computational fluid dynamics
Computational fluid dynamics (CFD) is a branch of fluid mechanics that uses numerical methods and algorithms to solve and analyze problems that involve fluid flows
Background :
1- viscosity to yield the Euler equations
2- removing terms describing vorticity
3- linearized potential equations.
4- Steady state Flow
5- incompressible

22. Applications:  AutoMotive
 Turbo Machinery
Aerospace
Air Foils.

23. Advantages of CFD
Relatively low cost.
Speed.
Ability to simulate real conditions
CFD PROCESS:
1- Create Mesh
2-boundry conditions
3-solve equations
4-iteratation

25. CFD for a nozzle with three blades

27. CFD for a nozzle with 5 blades

29. Advantages of 5-blade wind turbines over 3-blade wind turbines:
1) greatly improve annual energy
2) safe in high speed
3) lower wind turbine noise

30. Effect of tunnel with nozzle

32. Generator Choosing

33. Generator Cooling System :
1- Air Cooling
2- Water Cooling
Gearbox
Increase rpm  (n1/n2)=(z2/z1)
- with out gear box we can reduce
initial cost, eliminate the gearbox reduces maintenance costs and enhances reliability as gearboxes are failure prone.

34. Results Measurement devices Wind speed & Direction devices :
Cup Anemometer Digital Anemometer

35. RPM Measurement A sensor
is to sense shaft speed and sends speed data in the form of pulses
factors affect the quality of this data:
 1. Number of pulses per revolution of the shaft
Higher PPR values result in better resolution.
 2. Symmetry of pulses.  give more accurate data.

36. RPM Measurement Types Of Sensors
 shaft encoders (rotary pulse generators)
- offer high resolution
- (typically 1 to 5000 PPR)
- symmetrical pulses.
 Proximity Sensors
provide medium- or low-resolution sensing,
depending on
the number of pulses measured per revolution.

37. usually provide low resolution,
 Photoelectric Sensors
usually provide low resolution,
due to the low number of pulses
measured per revolution.
Methods of Determining RPM  Frequency measurement
Period measurement

38. Volt & Ampere measurement device:
Digital Multimeters Analog voltmeters

39. Results

40. Betz' Law (The theoretical maximum power efficiency ) :
Power = 0.5 x Swept Area x Air Density x (Velocity)3
Where Power is given in Watts (i.e. joules/second), the Swept area in square meters, the Air density in kilograms per cubic meter, and the Velocity in meters per second.
Betz' Law (The theoretical maximum power efficiency ) :
The rotors swept area = PI x (0.48/2)2 = m2
The air density = 1.23 kg/m3

42. to achieve the optimum design
Future modifications
to achieve the optimum design
1.Control system:
2.Safety system
must happen on steps,
at the beginning the pitch control
will rotate the blades to
minimize the lift force,
then the control system should rotate
the whole mechanism (cube)
in a direction away from the wind
direction, Finally the brake
will operate to stop the rotor.

43. 3.Electric system: 4. Nozzle on large scale -> Blocking diode
-> Battery
-> Charge controller
-> Dummy load
-> Electric inverter
4. Nozzle on large scale

44. 5. Adding scoop to the Tunnel
The scoop improves the power output of the wind turbine by accelerating the airflow in the cylindrical section.

46. MOST EFFICIENT TECHNOLOGY
WindTamer
Use the diffuser to separates the air,
creating two vacuums,
vacuums pull the air through,
turning the rotors faster and
generating more power more than double
the energy of conventional turbines.
Advantages of the WindTamer :
-->Clean energy
-->Silent and vibration free
-->Safe for birds — and people
-->MINIMAL MAINTENANCE
-->EASY ACCESS