Facts About Evacuated Tube Solar Water Heaters
Although you might not believe this, solar water heating is available for hundreds of years. As technology advanced they became more efficient and now the efficiency offered by evacuated tube solar water heaters is over 90 percent. This basically means that around 90% of the entire sun energy that will land on a surface can be converted right into heat. The costs of generating energy are incredibly low when compared to regular sources.
Vacuum tubes or evacuated tubes are usually built from glass. Pyrex is used in most cases when we have touble wall systems. Glass noticed in inner tubes is coated in most cases on its outer surface with the use of absorbing coating. Inside every single tube the air is usually removed so that a vacuum is created. Copper heat pipes are located right in the middle of these tubes. This special sealed heat pipe can absorb the infra red radiation together with even including anti freeze liquid.
One huge advantage that is obtained through the use of evacuted tubes is that they keep the solar water heating running well even when the temperatures fall below freezing point. Vaccums will prevent heat tubes from ending cooled too much by the temperature of the ambient. Also, evacuated tube systems can even absorb energy from the sun during winter and this is really important. In some cases the water can still be heated to around 50 degrees with the use of the already installed water heater system.
The main reason why evacuated tubes were not popular a few years ago was the fact that they were not really available for anyone. They were mostly used in commercial equipments that were too expensive and people had no reason to install a system that included them. Nowadays the tubes are warmly recommended by specialists and they are much more available. You would end up with a lot more efficiency in your solar water heater system if it includes good evacuated tubes.