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NREL CA Solar Benefits Appendix A A.4 CPV Systems Concentrating photovoltaic (CPV) systems have potential for cost reduction compared with conventional, non-concentrating (also referred to as flat plate) PV systems in two key ways. First, a major portion of conventional PV system cost is for the semiconductor material which makes up the PV modules. By concentrating sunlight onto a small cell, the amount of semiconductor can be reduced, albeit at additional cost for mirrors or lenses and for tracking equipment. Second, use of smaller cells allows for more advanced and efficient cell technology, making the overall system efficiency higher than for a conventional flat plate system. CPV systems have been under development since the 1970’s. This development has included single axis tracking, line focus CPV and two axis tracking, point focus CPV. Recent development has primarily been on the two-axis tracking systems. There are two primary developers of CVP systems today: Amonix, a company based in Torrance, California, and Solar Systems Pty, Ltd, located in Australia. The Amonix CPV unit, shown on Figure A-7, produces 25 to 35 kW per tracker, depending on how many modules are installed on the tracker. The Amonix system uses hundreds of acrylic Fresnel lenses to focus DNI on high concentration PV cells. Heat rejection is passive, meaning there is no water requirement and no closed loop radiator system The Amonix unit currently has an average annual efficiency of 15.5 percent. Figure A-7 Amonix: Flat Acrylic Lens Concentrator with Silicon Cells (Source: NREL) April 21, 2006 A-11PDF Image | Economic, Energy, and Environmental Benefits of Concentrating Solar Power in California
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