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Solar Pond or Salt Gradient Solar PondSolar Ponds consist of three main layers. The top layer is cold and has little salt content. The bottom layer is hot, in the range of 60-85C and very salty. Separating these two layers is the important gradient zone. Here salt content increases with depth as shown in the drawing. Water in the gradient can’t rise because the water above it has less salt and is therefore lighter. Similarly, water can’t fall because the water below it has a higher salt content and is heavier. Thus the stable gradient zone can act as a transparent insulator, permitting sunlight to be trapped in the hot bottom layer from which useful heat is withdrawn. In this simplified description, no attempt is made to describe the hydrodynamic phenomena which influence zone and interface stability, salt and heat transport, and other complex behaviour. |
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