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.

SOLAR BASICS---(Continued)

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 above. 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 indicated 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 a pressurized water system, you must use a system that has a specially design tank that is designed to withstand Higher pressures. (Thermosol® model: High-Pressure System for Residences)

The key component of a Thermosol® solar water heating system is the use of the evacuated-tube collector, the most advanced and highest performing technology available for harnessing and storing high temperature heat energy from the sun.

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