Abstract :
We introduce a novel optofluidic solar concentration system based on electrowetting tracking. With two immiscible fluids in a transparent
cell, we can actively control the orientation of fluid–fluid interface via electrowetting. The naturally-formed meniscus between the
two liquids can function as a dynamic optical prism for solar tracking and sunlight steering. An integrated optofluidic solar concentrator
can be constructed from the liquid prism tracker in combination with a fixed and static optical condenser (Fresnel lens). Therefore, the
liquid prisms can adaptively focus sunlight on a concentrating photovoltaic (CPV) cell sitting on the focus of the Fresnel lens as the sun
moves. Because of the unique design, electrowetting tracking allows the concentrator to adaptively track both the daily and seasonal
changes of the sun’s orbit (dual-axis tracking) without bulky, expensive and inefficient mechanical moving parts. This approach can
potentially reduce capital costs for CPV and increases operational efficiency by eliminating the power consumption of mechanical tracking.
Importantly, the elimination of bulky tracking hardware and quiet operation will allow extensive residential deployment of concentrated
solar power. In comparison with traditional silicon-based photovoltaic (PV) solar cells, the electrowetting-based self-tracking
technology will generate 70% more green energy with a 50% cost reduction.
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