Asalt-gradient solar pond is a shallow body of water that consists of three distinct fluid layers and is used to collect solar energy. the upper- and lower-most layers are well mixed and serve to maintain the upper and lower surfaces of the central layer at uniform temperatures ti and ta, respectively, where ta t. consider conditions for which solar radiation absorption in the central layer provides non uniform heat generation of form and the temperature distribution in the central layer i where a, a, b and c are constants and k is the thermal conductivity i) obtain expressions for the heat flux from the lower mixed layor to the central layer and from the central layer to the upper mixed layer. determine whether the conditions are steady state or transient