SOLAR THERMAL TECHNOLOGY
Solar energy can be converted to heat by using a collector system. This heat can be used in building, industry, and agriculture sectors.
Collector system has two parts concentrator and receiver. Sunlight is redirected and focused on the receiver by concentrator. Solar Radiation is absorbed and converted into heat.
There are two types of Solar collectors.
1. Focusing
2. Non focusing collectors are kept fixed. These give low-temperature outputs
Solar pond and the evacuated-tube collector are this class of collectors
One type of solar collector is salt-gradient solar pond. A thin layer low-salinity water covers a layer of water in which a salinity gradient is created. The bottom layer is usually at or near salt saturation. Sunlight passing water is absorbed and heats bottom layer. The salt concentration increase the liquid density and prevents the natural convection. The heat trapped and stored at the bottom can be extracted for use.
Several solar ponds are operating around the world. The bottom hot brine, with temperatures near 1800F (800C), can provide low-temperature heat for many industry or electricity generation.
The evacuated-tube collector can provide temperatures of up to 3000F (1500C) for industrial process steam.
Several solar ponds are operating around the world. The bottom hot brine, with temperatures near 1800F (800C), can provide low-temperature heat for many industry or electricity generation.
The evacuated-tube collector can provide temperatures of up to 3000F (1500C) for industrial process steam.
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