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.

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thermosiphon systems

Passive systems move the water through the tank and collectors without pumps. Passive systems have the advantage that electrical outages and electric pump breaksowns are not issues. This makes them generally more reliable, easier to maintain, and possibly longer lasting than an acitve system.

One type of passive system is called a "thermosiphon system". This type of system relies on warm water rising (convection) to circulate water through the collectors and to the storage tank. In this type of installation, the tank must be above the collector. The systems that Thermosol® uses for residential installations, have the tank incorporated in the collector.

When cold water is put into the storage tank, the water flows down to the bottom of the evacuated tubes. As the water in the collector/tubes heats, it becomes lighter and rises naturally into the tank avove. The water continues to circulate, keeping the water hot in the storage tank.




This diagram is only to demonstrate the principle of convection; cold water put into the tank naturally flows down the tubes and rises when it is hot. As the water coming from the tubes is hotter than the water in the tank, it rises to the top of the tank. The water at the bottom (while hot, it is not as hot) flows down the tubes to reheat. (The water is not "cool" as indicted in the drawing which is for demonstration purposes only).




The storage water tank of a thermosiphon solar water heating system is not designed to withstand pressure in excess of 8 p.s.i. The water must be fed by gravity to the top of the storage tank. In order to use a thermosiphon type solar water heater with pressurized water, you must use a system that has a specially designed tank that can withstand higher pressures. (Thermosol® model: High-Pressure System For Residences).

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