Solar thermal system with solar pond and method of maintaining solar pond

Abstract

A solar thermal system, comprising a solar pond ( 10 ) for accumulating salt water heated by solar radiation and a moisture supply device ( 20 ) allowing the vapor evaporated from the water having impurities such as sea water to be absorbed by the salt water; a method of maintaining the solar pond; and a method of forming the solar pond; the system, wherein the moisture supply device may have an absorbing heat pump for receiving the supply of the salt water and the water having the impurities, and the salt water with excellent cleanliness is circulated to the solar pond by the operation of the moisture supply device, whereby scale deposit and propagation of algae in the solar pond can be prevented.

What is claimed is:  
     
         1 . A solar heat system, comprising: 
 a solar pond for storing a saline water which is heated by a solar radiation; and    a water providing device which allows the saline water to absorb a water vapor evaporated from an impurities containing water.    
     
     
         2 . The solar heat system according to  claim 1 , wherein the water providing device includes an absorption heat pump which is supplied with the saline water and the impurities containing water.  
     
     
         3 . The solar heat system according to  claim 1 , further comprising a concentrator for concentrating the saline water.  
     
     
         4 . The solar heat system according to  claim 3 , wherein the concentrator is a distillation device.  
     
     
         5 . A method for maintaining a solar pond, comprising the steps of: 
 storing a saline water having a prescribed distribution of concentration in a solar pond; and    allowing the saline water to absorb a water vapor evaporated from an impurities containing water.    
     
     
         6 . The method for maintaining solar pond according to  claim 5 , further comprising the step of concentrating the saline water.  
     
     
         7 . A method for constructing a solar pond, comprising the steps of: 
 dissolving a solid salt by a saline water which is unsaturated;    supplying the saline water in which the solid salt is dissolved to a water providing device;    allowing the saline water in which the solid salt is dissolved to absorb a water vapor evaporated from an impurities containing water in the water providing device;    further dissolving the solid salt by returning a part of the saline water which has absorbed the water vapor evaporated from the impurities containing water to the solid salt; and    feeding the rest of the saline water which has absorbed the water vapor evaporated from the impurities containing water to the solar pond.