Abstract
Turbidity was calculated by solar irradiance (Linke's Turbidity) for sixteen Iraqi sites. These locations were distributed among middle, north and south. These results have been updated depending on direct solar radiation, diffused solar radiation, total solar radiation, and solar constant as inputs for mathematical models in computer programs. Taking into account the hours of actual and theoretical brightness of the sun, the angle of the sun's rays, and the altitude angle of the sun during the months of the year. The results showed that the turbidity in the Iraqi sites considered in this research depends mainly on the months of the year regardless of the site is located at the north, middle, or south of Iraq. The turbidity has the greatest values during the winter season, specifically in December, where the average turbidity ranged for those sites. In this month (4.85 - 5.73), then January (4.75 - 5.72), it begins to decrease until the value of turbidity in most sites reaches its minimum level in the month of September, where the average turbidity of the studied sites is ranged (except for the site of Najaf) in this month (2.82 - 3.10). While the Najaf site was unique in registering the minimum average value of turbidity in the month of June by (3.25). The results showed that the turbidity in all the sites included in this research ranges between (2.82 - 5.73) during the year.
Highlights
During the last ten years, I conducted many researches on the subject of turbidity and solar radiation
Abdul Wahid and Hassan Abbas Judeh [1]: It has relied on the solar radiation as a basic input for mathematical models to find turbidity for 16 Iraqi cities during 30 years, They were found that the amount of turbidity ranges between 4.27 - 4.75, there was a slight difference in the amount of turbidity from one location to another and that its average value varies from north to south
Sahib Neamh Abdel Wahid and others [2]: In this work they have the use of hours of sun shin and solar radiation in the inputs of different mathematical models for the period from 1961 to 1991 AD and for different regions of Iraq it was found that the maximum values of diffuse radiation are in the summer while the minimum values of dispersed radiation are during December and January
Summary
During the last ten years, I conducted many researches on the subject of turbidity and solar radiation. N. Abdul Wahid and Hassan Abbas Judeh [1]: It has relied on the solar radiation as a basic input for mathematical models to find turbidity for 16 Iraqi cities during 30 years, They were found that the amount of turbidity ranges between 4.27 - 4.75, there was a slight difference in the amount of turbidity from one location to another and that its average value varies from north to south. Sahib Neamh Abdel Wahid and others [2]: In this work they have the use of hours of sun shin and solar radiation in the inputs of different mathematical models for the period from 1961 to 1991 AD and for different regions of Iraq it was found that the maximum values of diffuse radiation are in the summer while the minimum values of dispersed radiation are during December and January.
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