in all honesty thermal heat storage has been around for centuarys . just ask anyone that lives in places like norway and rusha . houses built around a main stack with multy pass chimney flues or even korean under floor heating . even moden day rocket mass heating ! SAND IS JUST ANOTHER WAY OF CAPTURING HEAT FROM AN OTHERWISE WASTED HEATING SYSTEM . i live 2 miles away from a realy big gas corp ! and all year they have burn off towere's flairing all night just to dump gasses that are not good for the enviroment . YET MY COUNTRY WANTS TO BAN WOOD FIRED STOVES . this topick is just another B.S ! [ NONSENSICAL SOLUTION THAT DOES NOT NEED FIXING ] honest i think it's the arabs trying to sell you sand in this twisted world we live in .
Someone needs to learn about the concept of entropy ! Heat energy and electrical energy do not have the same value... also low specific heat is *not* a good thing ... temperature variation needs to be much wider.
