El precio del gas sube cada mes en enero del 2004 era de y en enero del 2005 es de                                                                        El precio de gas LP  en el 2001 era de $.85 por litro en marzo de 2005 $4.10.                                                                         Los países desarrollados utilizan masivamente la energía renovable como fuente de energía.                                                                        No hay suficiente petróleo para satisfacer las demandas que va a haber dentro de años.                                                                        México ocupa el cuarto lugar como consumidor de gas licuado de petróleo a nivel mundial.                                                                        México ocupa el primer lugar mundial como consumidor de gas licuado para uso doméstico                                                                        Los expertos afirman que la temperatura se ha incrementado en 0,5 grados centígrados por la continua emisión de gases a la atmósfera.                                                                        La continua emisión de gases a la atmósfera provoca el ya popular efecto invernadero causante de desastres naturales.                                                                        Expertos aseguran que la producción de gas natural estará en su punto máximo en el 2020.                                                                        En la Unión Europea, para 2010 deberán estar instalados 100 millones de metros cuadrados de calentadores solares.                                                                        Sabías que instalando un calentador solar te ahorras el 80% des gas que utilizas regularmente.                                                                        La inversión en un calentador solar se recupera de 12 a 16 meses.

Evacuated Solar Tube

The evacuated tubes are the key component of a Thermosol® Solar Water Heating System, absorbing the radiation from the sun.

Renowned research institutes from Germany and Australia first invented and successfully experimented with the glass evacuated tube as solar collectors. The technology is now widely accepted all over the world has been in use for many years in countries such as Germany, England, Canada and China. With mass production, the technology that was once expensive is now affordable.

Each evacuated tube consists of two glass tubes. The outer tube (tubo de vidrio exterior) is made of extremely strong transparent borosilicate glass that is able to resist impact from hail up to 25mm in diameter. This transparent tube allows light rays to pass through to the inner glass tube (tubo de vidrio interior) which is coated with a special aluminum coating. This coating has excellent solar heat absorption and minimal heat reflection properties.

During manufacturing of the tube, the air is withdrawn (evacuated) from the space between the two glass tubes to form a vacuum, which eliminates conductive and convective heat loss. The evacuation is an important factor in the performance of the evacuated tubes as a vacuum is an excellant insulator, helping to maintain the heat absorbed. The insulation properties are so good that while the inside of the tube may be 150ºC, the outer tube is cold to the touch.

In order to maintain the vacuum, a barium getter (the same as in television tubes) is exposed to high temperatures, which causes the bottom of the evacuated tube to be coated with a pure layer of barium. The silver coloured barium layer also provides a clear visual indicator of the vacuum status, as it will turn white if the vacuum is lost. This makes it easy to determine whether or not a tube is operating correctly.

A getter maintains the vacuum.


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

The evacuated tube can be compared to putting your coffee in a glass lined thermos, where it will keep hot for hours. Using a Flat-plate solar system is like putting the same coffee in an open coffee cup, it will be cold in a short period of time.

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