SOLAR POND:-

• A natural or artificial body of water for collecting and absorbing solar radiation energy and storing it as heat. thus a solar pond combines solar energy collection and sensible heat storage.
• The solar pond is very shallow about 5 to 10cm deep which has a radiation absorbing bottom.
• A bed of insulating material under the pond minimizes loss of heat to the ground.
• In a suitable climate, all the pond water can become hot enough for use in space heating and agricultural and other processes.
• The water in shallow pond heats up only a few degrees because of the natural convection currents which are set into motion as soon as heat is absorbed at the bottom. In deeper pond temperature variation generally exist.
• The situation is changed if the pond contain salt water at the bottom with a layer of fresh water above it.
• Because of salt contain, the solar pond bottom water is more dense than the cooler fresh water at the top. A relatively stable layer of heated salt water is thus produced at the bottom of the pond with a lighter layer of cooler fresh water which acts as a heat insulator.
• The solar pond is defined as, ' an artificially constructed pond in which significant temperature rises are caused to occur in the lower regions by preventing convection.'