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

Comparing evacuated tube collectors with the flat-plate collectors

The most common collector for solar hot water is the flat plate collector. It is a rectangular box with a transparent cover, installed on a building's roof. Small tubes run through the box and carry fluid-either water or other fluid, such as an antifreeze solution. The tubes attach to a black absorber plate. As heat builds up in the collector, it heats the fluid passing through the tubes. The hot water then goes to a storage tank.

Evacuated Tube collectors consists of rows of parallel transparent glass tubes, each containing an absorber and covered with a selective coating. Sunlight enters the tube, strikes the absorber, and heats the liquid flowing through the absorber. These collectors are manufactured with a vacuum between the tubes, which helps them achieve extremely high temperatures (170-350 degrees F).

The evacuated tube collectors are superior to flat-plate collectors in numerous ways.

Due to the cylindrical shape of the evacuated tube (tubos al vacío), the sun is always striking the tubes at an angle which is perpendicular to their surface thus reducing reflection and maximizing the total amount of solar radiation the collector is exposed to each day.

Flat-Plate collectors (Serpentín con cubierta de vidrio) have the disadvantage that the sun is only perpendicular to the collector at noon and thus a proportion of the sunlight striking the surface of the collector is likely to be reflected.

The vacuum in the tube greatly reduces conductive and convective heat loss from the interior of the tube. The tubes are able to absorb the energy from infrared rays which can pass through clouds. Wind and cold temperatures also have minimal effect on the efficiency of the evacuated tube collector as compared to the flat-plate solar collectors which can produce similar heat outputs to the evacuated tube collectors, but generally only during warm, still and sunny conditions.

THE BENEFITS

Solar hot water heaters have many economic advantages. Although the initial cost of solar water heaters may be higher than conventional water heaters, solar energy is free. A well-insulated solar hot water heater in a home can supply sixty to seventy percent of the energy needed to heat water for a year. By using solar energy for water heating, families and businesses are not as affected by shortages or price increases of fossil fuels or electricity. In 2003, the price for LP gas in Mexico was MN$0.85, in 2005 it was MN$3.40, it is now MN$4.90 per litre.

Solar water heaters also provide certain environmental benefits. Solar water heaters do not pollute, which is significantly advantageous compared to the air pollution and waste created by electrical, oil, propane or natural gas water heaters.

Thermosol SA de CV
Capturar El Poder Del Sol®

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