مدل سازي و بررسي تجربي عملكرد سلول هاي خورشيدي تحت تمركز نور خورشيد

چكيده انگليسي :

Modeling and Experimental Investigation of Performance of a Low Concentration PV System Batoul Zamani b zamani@me iut ac ir 20 September 2014 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Ali Akbar Alemrajabi rajabi@cc iut ac ir Mohammad Ali Badri malbdr@cc iut ac irAbstractNowadays due to increasing energy consumption in the world the renewable energies especially solar energyand systems are important Photovoltaics PV is a method of generating electrical power by convertingsunlight into direct current electricity using semiconducting materials that exhibit the photovoltaic effect Using concentrator systems to increase the light intensity on solar cells result in increasing of photovoltaicsystem power Concentrated photovoltaic CPV technology uses optics such as lenses or curved mirrors toconcentrate a large amount of sunlight onto a small area of solar photovoltaic cells to generate electricity The solar energy systems are characterized by their concentration ratio CR expressed in X suns and arecombined with linear focus 2D or point focus 3D absorbers for low CR 10X medium CR 100X or high CR 100X CR respectively Concentrating systems with CR 2 5X use a system to track the sun andfor systems with CR 2 5X stationary concentrating devices can be used Compared to regular non concentrated photovoltaic systems CPV systems can save money on the cost of the solar cells since asmaller area of photovoltaic material is required CPV systems operate most efficiently in concentratedsunlight as long as the solar cell is kept cool through use of heat sinks Diffuse light which occurs in cloudyand overcast conditions cannot be concentrated To reach their maximum efficiency CPV systems must belocated in areas that receive plentiful direct sunlight Among concentrating systems low concentratingsystems with concentration ratio of less than 10 are important because of using the current monocrystallinesolar cells and needless for complicated cooling systems Examples of these systems include compoundparabolic concentrators prism based concentrators and V troughs In this research effect of sun lightconcentration on performance of mono crystal solar cells has been considered experimentally also theperformance of the solar cells present with three ideal models a single diode and two diodes and comparedwith experimental results In these experiments that is done by concentrating the sun light with mirrors theparameters of light intensity and temperature of cells changed and influenced on its performance Theexperimental results obtained are Short circuit current increases linearly with light intensity that increasing due to temperature is negligible Open circuit voltage of solar cells decreases with increasing temperature Open circuit voltage of the cells increases by increasing the light intensity and this increase is more pronounced at high light intensity Increasing radiation intensity on solar cells results in increasing the power of cells but the efficiency of these cells reduces due to increasing temperature Increasing concentration at constant temperature increases the sufficiency of the cells but the importance of concentration is because of the increased power Between the provided models the single diode and two diode models represented better results that the importance of considering the series resistance can be realized By increasing light intensity difference increases between maximum power in the ideal model and experimental results For the carried out test results the parameter of uncertainty is also calculated The average value ofthis parameter for maximum power and fill factor is 4 195 and 5 07 percent respectively Key WordsSolar cell concentration PV solar cell modeling low concentration systems

زماني، بتول

مدل سازي و بررسي تجربي عملكرد سلول هاي خورشيدي تحت تمركز نور خورشيد

سيستم هاي متمركز كننده فتوولتاييك , مدل سازي سلول خورشيدي , سيستم هاي تمركز پايين