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The objective of this paper is to evaluate the annual, monthly and the seasonal performance of the wind resource at the Zawiya region in northwest of Libya. In this study, the wind data are obtained from the coastal site located in the northwest of Libya at height of 50 meters above the ground level. The results show that the annual average speed is 6.14 m/s, and the annual Weibull parameters are shape factor K = 3.2, scale factor C = 6.9 m/s, and the annual energy production of 750 kw wind turbine is 2.70 Gwh/year.

The generated energy from renewable sources like wind reduces toxic gases released from traditional power plants, and saves oil consumption. Outfitting the wind is one of the cleanest, most reasonable approaches to create power. Wind vitality is the quickest developing wellspring of power on the planet. The wind is generated due to the pressure gradient comes from uneven heating of the earth’s surface by the sun. As the very driving force causing this movement is derived from the sun, wind energy is basically being indirect form of solar energy; this means that the wind is driven by the temperature difference [

In this paper, data obtained from the metrological coastal station have been analyzed [

Weibull probability density function is commonly used and widely adopted in wind power study [

where

Location | Longitude | Latitude | Altitude (m) | Measurement years |
---|---|---|---|---|

Zawiya | 32.45 N | 12.43 E | 17 | 01/01/2013 01/01/2016 |

The air density affects the power generated by a wind turbine which can be expressed by the following equation [

where ρ is density of the air (Kg/m^{3}), and s is swept area in m^{2}.

The wind kinetic energy is converted to electrical energy by the wind turbine, and the effective power generated is expressed in the following relation [

where C_{e }is wind turbine efficiency, and the wind turbine technical specifications parameters for this site are listed in

The wind analyses for the Zawiya region show that the annual shape factor K = 3.2, and scale factor is 6.9 (m/s), as illustrated in ^{2} in July and 503.21 w/m^{2} in February as shown

Model | FL750 |
---|---|

Rated Power Kw | 750 |

Rotor Diameter (m) | 50 |

Hub height (m) | 50 |

Cut-in Speed (m/s) | 3 |

Rated wind Speed (m/s) | 14 |

Cut-Out Speed (m/s) | 20 |

Swept area of Rotor(m^{2}) | 1960 |

Efficiency % | 60 |

Location | Shape factor (K) | Scale factor (C) | V (m/s) |
---|---|---|---|

Al zawiya | 3.2 | 6.9 | 6.14 |

The seasonal Weibull wind distribution at 50 m is shown in

with 6.95 m/s. Moreover, the mean seasonal power density at 50 m varies between 183.78 w/m^{2} in summer and 401.34 w/m^{2} in winter.

From Weibull distribution, as shown in

The monthly, seasonal and annual Weibull parameters, mean wind speed, and wind power densities at a height of 50 meter in the Zawiya region in northwest of Libya have been determined in this study. The study shows that the site is

Elevation | 50 m | ||
---|---|---|---|

Parameters | V [m/s] | P [w/m^{2}] | Energy Mwh/month |

January | 6.11 | 230 | 207 |

February | 7.92 | 503.21 | 375 |

March | 6.81 | 470.51 | 352 |

April | 6.7 | 465.2 | 348 |

May | 6.12 | 206.31 | 185 |

June | 5.81 | 190.91 | 171 |

July | 5.12 | 155.81 | 140 |

August | 5.53 | 180.42 | 135 |

September | 5.85 | 220.31 | 198 |

October | 5.77 | 207.31 | 186 |

November | 5.91 | 209.11 | 187 |

December | 6.10 | 240.52 | 216 |

Zawiya | 50 m | |
---|---|---|

Parameter | Wind Speed (m/s) | Power Density P(w/m^{2}) |

Winter | 6.95 | 401.34 |

Spring | 6.11 | 287.50 |

Summer | 5.5 | 183.78 |

Autumn | 5.92 | 218.98 |

windy, and can be used to generate electricity where annual mean speed V = 6.14 m/s and 7934 hours’ wind speed are between 3 - 19 m/s. The better performance of wind is in the winter season, as the site is in a costal side of Libya and facing to the Mediterranean Sea. The annual expectation of energy production by this site makes it virgin and promising land. The General Electric Network Office of Libya should integrate renewable resources through Libya’s grid, where a 750 kw wind turbine produces about 2.70 Gwh/year.

Hasan, S.H.A., Guwaeder, A. and Gao, W.Z. (2017) Wind Energy Assessment of the Zawiya Region, in Northwest Libya. Energy and Power Engineering, 9, 325-331. https://doi.org/10.4236/epe.2017.96022