SOLAR POND

摘要

PURPOSE:To restrict a convection flow and improve an efficiency of heat collection by a method wherein a plurality of transparent partition films are arranged in a water tank in a laminated form, a heating convection flow layer is stored in a lower chamber at the lowermost transparent partition film and pure water is stored at the upper part of the uppermost transparent partition film and further an intermediate layer is composed of a plurality of closed convection layers. CONSTITUTION:A plurality of transparent partition films 1 having a light permeable characteristic are arranged in a laminated form, a lower chamber of a transparent partition film at the underground level is made as a convection flow layer 3 for heating, and fresh water is stored at the upper side of the uppermost transparent partition film 1. Between each of the layers over the convection flow layer 3 is filled salt solution 5 which is already adjusted so as to increase its temperature in sequence from the upper layer to the lower layer. That is, a high density salt solution 5a is filled in the lower layer and then solutions 5b, 5c, 5d having their concentration diluted in sequence are filled in the upper layers. Cold water A is heated by the convection flow layer 3 and discharged out as a hot water B. Thereby, the layer filled with salt solution 5 is changed to non-convection layer and at the same time a gradation of concentration is produced in sequence from the lower layer to the upper layer, so that a radiation of solar heat stored in the convection flow layer 3 may effectively be restricted.