Solar collectors are trying to save energy wasted in daytime electric lighting, which "represents the single largest consumer of electricity in commercial and residential buildings." Artificial lights are inefficient not just in the way they produce light from electricity (only a fraction of the electricity they take in emerges as light), but because they often squander the light they make with shades, fittings, dimmers, diffusers, and so on.
While recognizing the advantages of using natural light, the inventors also understood the drawbacks: the Sun's energy carries heat, as well as light, and it's important to separate the two if you want to make a building light without making it hot at the same time.
The efficiency of a solar collector is defined as the quotient of usable thermal energy versus received solar energy. Besides the thermal loss, there always is the optical loss as well. The conversion factor or optical efficiency h0 indicates the percentage of the solar rays penetrating the transparent cover of the collector (transmission) and the percentage being absorbed. Basically, it is the product of the rate of transmission of the cover and the absorption rate of the absorber.
If used correctly solar day and night lighting can provide free, high-quality lighting, and do it with less heat generation inside the house than conventional electric lighting.
Solar collector efficiency is influenced by several factors like heat gain, surface area, the conversion factor and heat loss through conduction and convection. Low-temperature solar collector models operate at high-efficiency levels when the temperature difference is between 5 and 30°C (41 and 86°F) and medium-temperature models operate when the temperature difference is between 15 and 200°C (59 and 392°F).
However, there is a barrage of cheap solar collectors being imported and sold, that do not comply with the flag statute. This is bad for a number of reasons. Imported stuff is cheaply made and more importantly, the designs, materials, colors, and methods do not compare well with the better quality, longer-lasting, and correctly designed solar collectors made by American manufacturers. The Flag Company Inc specialized in flags and flagpole lightings offered a special edition of solar-powered collectors to provide innovative solutions for individual projects.
While recognizing the advantages of using natural light, the inventors also understood the drawbacks: the Sun's energy carries heat, as well as light, and it's important to separate the two if you want to make a building light without making it hot at the same time.
The efficiency of a solar collector is defined as the quotient of usable thermal energy versus received solar energy. Besides the thermal loss, there always is the optical loss as well. The conversion factor or optical efficiency h0 indicates the percentage of the solar rays penetrating the transparent cover of the collector (transmission) and the percentage being absorbed. Basically, it is the product of the rate of transmission of the cover and the absorption rate of the absorber.
If used correctly solar day and night lighting can provide free, high-quality lighting, and do it with less heat generation inside the house than conventional electric lighting.
Solar collector efficiency is influenced by several factors like heat gain, surface area, the conversion factor and heat loss through conduction and convection. Low-temperature solar collector models operate at high-efficiency levels when the temperature difference is between 5 and 30°C (41 and 86°F) and medium-temperature models operate when the temperature difference is between 15 and 200°C (59 and 392°F).
However, there is a barrage of cheap solar collectors being imported and sold, that do not comply with the flag statute. This is bad for a number of reasons. Imported stuff is cheaply made and more importantly, the designs, materials, colors, and methods do not compare well with the better quality, longer-lasting, and correctly designed solar collectors made by American manufacturers. The Flag Company Inc specialized in flags and flagpole lightings offered a special edition of solar-powered collectors to provide innovative solutions for individual projects.
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