A solar pond can be used to generate electricity by driving a turbine using an organic fluid. Even low temperatures heat that is obtained from solar pond can be converted into electric power. The conversion efficiency is limited due to its low operating temperatures (70-100ºC). Because of low temperature, the solar pond power plant requires organic fluid which have low boiling points such as halo-carbons (like Freons) or hydrocarbons (such as propane).
The figure shows solar pond electric power plant. The heat trapped in solar pond can be used to evaporate organic fluid in evaporator. This organic fluid vapour is expanded in turbine, which is coupled with electric generator. The organic fluid is condensed in condenser and pumped to evaporator to continue the cycle.
Figure 2.11 –Solar Pond Electric Power Plant
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