POOL HEATING with a FRESNEL LENS
I receive viewer mail weekly asking, "With all that heat produced by a Fresnel Lens, can I point a lens at my swimming pool a few hours a day and heat it?" The simple answer is no. Water is clear and any light collected from the Fresnel lens will simply pass the focal point and continue into a wide pattern exiting as reflective light..............Click to read full article.
FRESNEL LENS BEAM TEMPERATURE
How to determine the temperature of the Fresnel Beam.
"How hot is that beam of light?"
This is a common question that really does not have an exact answer. The beam of light concentrated by a Fresnel lens or parabolic mirror will have a temperature equal to that of the surrounding ambient temperature. If you are working with..............Click to read full article.
EVACUATED SOALR TUBE WATER HEATERS
Solar evacuated tubes AKA solar vacuum tubes are pyrex (borosilicate) glass that does not crack or break when exposed to radical temperature changes. This glass is crystal clear..............Click to read full article.