SPLTRAK Abstract Submission
Light Distribution and Uniformity Evaluation of Cross Compound Parabolic Concentrators  
Mazin Al-Shidhani1,2& Mohammad Alnajideen1
1School of Engineering, Cardiff University, Cardiff, United Kingdom
/2Petroleum Development Oman, Muscat, Oman

Concentrator photovoltaic systems are capable of generating electric power from sunlight more than that produced from unconcentrated systems of the same photovoltaic material and size, thus beneficial to reduce photovoltaic areas and costs. In this work, we propose a Compound Parabolic Concentrator (CPC) for low concentration photovoltaic systems. A symmetrical CPC, which has a square entry and exit apertures known as a Cross CPC (CCPC), has been optically simulated and tested under a standard test condition for different geometrical concentration ratios of 2.9x, 4.0x, 6.0x, 8.0x and 9.0x. These concentrators were coupled to the same monocrystalline laser grooved buried contact silicon solar cell to acquire the characteristic current-voltage (I-V) curves. The design, simulation, fabrication and experiment testing of concentrators are presented. The non-uniformity light distribution across the receiver surface area and its effect on the power output of solar cell is demonstrated and validated. A new batch of five concentrators referred as an improved design has been fabricated and tested to validate the raytracing simulation. A comparative study between the old and new CPC designs is conducted based on the I-V performance curves. It has been proven that high uniformity of over 90% can be achieved by adjusting the solar cell at an optimal position, which varies based on the geometrical aspects of a CPC.