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Solar panel are divided into: silicon and films. Silicon 90% of total output of products, it can further subdivided into - monocrystalline silicon and polycrystalline silicon. Polycrystalline silicon products accounted for two-thirds of polysilicon product has, the more expensive than silicon product more outstanding cost-effective.
As the world's largest production base, China produces one of the solar water heater battery and panel accounted for 30% of the global production.
According to China's ministry of industry and information statistics, since 2002, China's domestic pv industry average annual growth rate of more than 100%. The 2008 total output over 2000 megawatts (mw).
The development of Chinese pv industry with global synchronous, from 1998 to 2008 10 years, the global solar hot water industry is in a compound rate of 35%. In 2008, solar cells to the output 5456 megawatts, panel 6791 megawatts of the output. Despite the decline in demand, but estimates that by the end of 2009, total output can will still grow 56 percent.
Some of the most prominent is home solar water heater usually in the natural cycle way job, no external power, a well-designed system as long as there are 5 ~ 6 ℃ above the temperature difference can cycle is very good. Water pipe and pipe diameter distribution of rationality directly affect the solar collectors heat efficiency. In most cases, natural circulation residential water system pipeline flow pattern can be regarded as the laminar flow. The resistance of the piping system within the collectors are mainly from frictional resistance, the influence of local resistance is much smaller, including tubes than the frictional resistance and competent much greater. When water temperature rose, due to a sports viscosity decreased, frictional resistance decrescent, the influence of local resistance become larger. Within a certain range, when competent diameter constant, increasing tubes diameters, not only frictional resistance quickly reduced and reduced local resistance also will follow. Generally, the tubes in hydraulic radius should be more than 10mm. When the competent diameter reaches a certain value, increase after the competent diameter to minimise the system mean little resistance.