3 years ago

Study on Renewable Energy Resources, Oman - authority for ...

Study on Renewable Energy Resources, Oman - authority for ...


Appendix 6

Appendix 6 efficiency Solar technology, applications and 6.1 Solar thermal systems For production of solar thermal energy at temperatures below 100 C there are two types of technology typically applied. One is a flat plate collector with an absorber covered by a special selective surface and a low iron glass cover, sometimes additional cover as well. The other is evacuated tubular collects in which the absorber is integrated into a glass tube with vacuum. The latter is more efficient for temperatures close to 100 C, but the flat plate is best for lower temperatures. These collectors convert up to 80 percent of the solar insolation to heat with a yearly average of up to 50% of the solar insolation. A popular system for a family consist of about 2 m2 of collector with an integrated storage tank located on top of the collectors so that a pump is not necessary to circulate the fluid in the collectors. Larger systems are made with collectors on the roof and a piping system for transfer of the heat to a storage tank in the building. Fig. A 6.1 Flat plate collector, evacuated tubular collector and the same with integrated storage tank for hot tap water. Another important application of solar thermal energy is for cooling. As cooling is most often provided with conventional electric compressors solar energy will also in this case replace electricity. The most typical system here is to use a higher temperature collector (often evacuated tubular collector, up to about 100 C) to produce heat for an absorption chiller. An important aspect here is that the system still uses electricity for pumping and other things which is sometimes significant.

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