Active thermal storage using the ground underlying a solar pond

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Details

126400, 126436, 126437, F24J 302

Patent

active

044522274

ABSTRACT:
An apparatus is presented for actively using the ground underlying a solar pond for storage of heat accumulated in the pond. Heated water will be injected down shallow wells and percolated through the soil. Recovery of heat will usually just reverse this injection. With this invention both major components will perform better than they would alone. Solar ponds will now have huge, cheap, thermal storage without requiring extra brine. In addition, the ground will be insulated by the overlying solar pond so heat losses will be low and heat recovery efficiency quite high. Embodiments of the basic strategy--thermal storage in permeable material insulated by the overlying solar pond--can be economically adapted to a wide variety of solar pond applications and locations. For example, where impermeable rock underlies a pond site a pond should be designed with a very deep, lined bottom zone filled with gravel. A small amount of brine will fill and circulate through the voids in this gravel. This embodiment also gives the large insulated thermal storage desired.

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