Introduction: Fresnel Lens Pool Heating Option

By GREENPOWERSCIENCE
About: You may recognize Dan and Denise Rojas from their appearances in various made for tv movies and national commercials. As the hosts of Green Power Science, they share Fresnel lens and alternative energy ideas, …

Uploaded time: Oct 19, 2009 03:55 PM
This large spot Fresnel lens can be used as a direct heater focused on copper coils with active fluid circulation. This is the only reasonable option for heating a swimming pool with a Fresnel Lens. Pointing the lens directly at the pool water does not work. This requires a computer hard drive water cooling kit or regular copper tubing.

This is a large Fresnel Lens focused on a copper tube with a 12 V pump (powered by two 6 watt solar panels) with water circulating through the unit. Water, seven gallons, was raised from 63 F to 106 F in one hour. It is not super efficient as heat is lost at the open top of the glass tank. This is designed to illustrate one method of solar heating a swilling pool with a Large Fresnel Lens.