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This paper presents a combination of linear Fresnel lenses optimized for ?25 solar concentration. The combined lens consists of 5?5 linear Fresnel lenses. Each Fresnel lens is of 10?10 mm and optimized to tilt the incoming light onto a solar cell of the same size. All of the optimized Fresnel segments have the same pattern height of 35 μm, draft angle of 4°, and edge groove round of 1 μm but with different facet angles varying from 14.1° to 31.2°. The solar concentrating efficiency of the combination is shown to be over 80% and more robust than a conventional single ?25 circular Fresnel lens in terms of pointing misalignment and manufacturing errors. A sensitivity analysis finds that the edge groove round should be kept as small as machining allows since the concentrating efficiency drops ~5% per 1 μm increase of the edge groove.

Linear Fresnel Lens Optimization for Middle Concentrated Photovoltaic