Lens Large
Lens Large
Is a Fresnel lens the best way to heat large amounts of water for a solar heating system,if not what is?
There will be underground storage tanks but not sure what size yet
What is best depends on what you want. How hot, how much water, how much sun (where you live), how much it costs and how much space on your roof and what sort of regulations you may need to comply with.
The simplest and cheapest for a build it yourself system may use black polyethylene pipe. This can work well in the tropics. By placing the tank above the absorption panel the water moves by convection currents, and no pump or controller is needed. Commercial units use blackened plastic or metal tubes behind glass. In colder zones they may be glass tubes in a vacuum. Look around what others use in your region. You will need a consultant anyway (perhaps a supplier) to size the system using their own local knowledge, and knowledge about their system. The important questions are more likely how it behaves in a storm, with snow, how long it lasts, etc. Most people buy on price too.
As you have an underground tank you need pumps and a control system to circulate the water, as that is how they heat the water, recirculating it through the tank and panel, adding a bit of heat each time.
Systems that use focusing will most likely need to have a tracking controller. The result is that the energy obtained over the day is maximised, as the collector is always pointed directly at the sun. What kind of focusing you use depends on availability in your region, regulations etc. A highly focused beam of sunlight is hazardous, and unnecessary for water heating. The energy obtained is per unit area of the incident sunlight so focusing increases the temperature not the energy. Tracking the sun alignment increases the energy over time (daily basis).
Opinion: Hoskins embodies old collegiate aspiration | Column
As I write this under the lens of a yellow Saturday sunset, I am listening to Chopin’s piano etudes and preludes, so that I might catch the spirit of my subject. My subject is UT’s Hoskins Library, which is a campus treasure and currently an artifact which, as …
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