http://www.greenpowerscience.com/
This video show how a Fresnel Lens can be used to generate heat in water for a pool. It also illustrates the inability to heat water only. and the need for a dark target. The heat sink used in this video falls small of being a right dark object but the green color looked cool.
Duration [...]

Green energy is the new status symbol. Solar energy is free, clean, and limitless and it is all yours when you install a solar energy system. Solar Homeowners are proud to own homes and business that produce no pollution and conserve natural resources.
Duration : 0:2:58

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Solar Pool Heater… and FYI for the DIY
Duration : 0:6:0

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Technorati Tags: poly, pool, solar, water

This video shows the power of solar water heating which is 10 times more efficient that solar panels (PV). At 58 degrees, the solar hot water collector is steaming with a temperature of 220 farenheit inside.
Duration : 0:0:41

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This composite, one piece monolithic solar collector prototype is extremely light in weight and in tests offers better performance than much more expensive evac tube types. Still in development
Duration : 0:7:8

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Technorati Tags: cheap, collector, cost, [...]