چکیده:
The extent of human need for energy resources has always been considered one of the fundamental and important issues in human life, and the effort to achieve a finite source of energy has been one of mankind's ancient goals. Fossil fuels such as oil, gas, and coal will eventually run out. This has caused developed and industrial countries to more seriously consider the use of other energies available in nature, especially new energies. The increase in environmental pollution caused by burning fossil resources, the discussion of global warming, the greenhouse effect phenomenon, and acid rain all necessitate saving fossil fuel consumption and paying double attention to the use of renewable energy resources. The use of solar, wind, wave, geothermal, hydrogen, biomass, etc., which are known as new energies, requires extensive studies and research before use. In our country, there are also good capabilities and potentials for installing and operating wind-electric turbines, and given their economic feasibility and research in this field, investments have been made. The development and application of this technology presents a bright prospect for the country's energy sector policymakers. In this article, using three-hourly data from several synoptic stations in the country over a ten-year period from 1986 to 1995, the wind power density with direct two-mode and the Weibull wind speed frequency distribution have been calculated. Research has shown that Weibull and Rayleigh distributions provide the best fit for wind speed models, and specifically, the former has more applications throughout the world. To identify the climate of a region from the perspective of the wind regime, determining the synoptic characteristics and the type of topography of each station is necessary. In this way, areas suitable for generating electricity from wind energy are identified according to the climate of each region and the existing local winds. The results show that apart from Manjil Valley, there are suitable areas such as Sardasht and Mahshahr in terms of wind energy production. Investment in this field requires extensive research from the perspective of climate and meteorological conditions.
خلاصه ماشینی:
In this way, areas suitable for generating electric power from wind energy are identified, taking into account the climate of each region and the available local winds.
Keywords: renewable energies, mountain valley wind, biomass, wind power density, sea and land breeze, Weibull and Rayleigh distribution Iran.
By the end of 1990, the capacity of grid-connected wind turbines in the world reached 200 megawatts with an annual capacity of 3200 Gwh, which was almost entirely produced in the state of California in the USA and the country of Denmark (Renewable Energy Organization - SANA, Third Report, 1383, 5).
This phenomenon is called a sea breeze, meaning that during the day, a dry air current blows from the sea toward the land at the Earth's surface.
Usually, vortices 16 are formed behind obstacles, which increase the fluctuations in wind speed and direction; therefore, the wind energy content is significantly reduced.
The wind shear relationship is as follows: (1) V represents the wind speed at height Z from the ground surface.
In Iran, the following empirical relationship has been used to calculate air density (Wind Energy Atlas of the Country, 1376, 66).
Initially, by using mathematical relations number 9 and 13, as well as wind speed data at a height of 10 meters, the wind power density was calculated directly.
Figures 1-b to 4-b also present the monthly averages of wind power density using the Weibull distribution and direct calculation for the four mentioned cities within the same time interval.
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