1. WATERPOWER LABORATORY Design of a small horizontal axis wind turbine, HAWT

2. WATERPOWER LABORATORY Design parameters Power Output, P:300 W Wind velocity, c:8 m/s Tip Speed Ratio, TSR:5 Assumed efficiency,  :30 % Number of blades, z:2 Wing profile:NACA 23015 Angle of attack,  8 o Lift coefficient, C L :0,8 Drag coefficient, C D :0,01

3. WATERPOWER LABORATORY Radius of the turbine D Where: A=Area[m 2 ] c=Wind velocity[m/s]  =Efficiency[ - ] P=Power[W]  =Density[kg/m 3 ] R=Radius[m]

4. WATERPOWER LABORATORY Speed of the turbine  Where: c=Wind velocity[m/s] n=Speed[rpm]  =Angular velocity[rad/s] R=Radius[m]

5. WATERPOWER LABORATORY Power through a section of the turbine blade r rr AA

6. WATERPOWER LABORATORY Torque force,  F T from a section of the turbine blade r rr AA FTFT

7. WATERPOWER LABORATORY Wing profile Chord Length, L chord

8. WATERPOWER LABORATORY L Chord 4  FLFL FDFD v Where: A=Area[m 2 ] a=Angle of attack[degrees] C D =Drag Coefficient[ - ] C L =Lift Coefficient[ - ] F D =Drag Force[N] F L =Lift Force[N] L Chord =Chord Length[m]  =Density[kg/m 3 ] V=Relative velocity[m/s]

9. WATERPOWER LABORATORY Peripheral velocity u u c Wind velocity = c Relative velocity = V V 

10. WATERPOWER LABORATORY   c u =  ·r v FLFL FDFD

11. WATERPOWER LABORATORY   c u =  ·r v   FLFL FDFD v c u 

12. WATERPOWER LABORATORY   c u =  ·r v   FLFL FDFD v c u  F L(Torque) F D(Torque)

13. WATERPOWER LABORATORY   c u =  ·r v   FLFL FDFD FTFT

14. WATERPOWER LABORATORY v FTFT

15. Chord Length, L chord L chord v c u 

16. WATERPOWER LABORATORY Output data