Heat storage for building heating

Claim 1

IN A SYSTEM OF THE CLASS DESCRIBED, A TANK HAVING INLET AND OUTLET OPENINGS, HEAT INSULATION MEANS ENCLOSING SAID TANK, A HOUSING ENCLOSING SAID TANK AND INSULATION MEANS BUT REMOTE THEREFROM TO PROVIDE A SPACE THEREBETWEEN, A HEAT STORING MEDIUM IN SAID TANK, FLUID FLOW PASSAGEWAY MEANS EXTENDING BETWEEN SAID INLET AND OUTLET OPENINGS AND IN HEAT TRANSFER RELATION WITH SAID HEAT STORING MEDIUM, MEANS FOR CHARGING SAID MEDIUM WITH HEAT TO BE STORED, FAN MEANS POSITIONED ADJACENT SAID INLET OPENINGS AND ADAPTED TO DIRECT A FLOW OF FLUID THROUGH SAID FLUID FLOW PASSAGEWAY MEANS IN HEAT TRANSFER RELATION TO SAID HEAT STORING MEDIUM, A DAMPER PLATE HAVING A SERIES OF APERTURES POSITIONED TO REGISTER WITH SAID INLET OPENINGS AND HAVING OPENINGS POSITIONED TO REGISTER WITH SAID SPACE BETWEEN SAID HOUSING AND INSULATED TANK, MEANS ADJUSTING SAID DAMPER PLATE BETWEEN A FIRST POSITION INITIALLY TO PERMIT THE FLOW OF FLUID ONLY THROUGH SAID SPACE AND FURTHER POSITIONS TO PERMIT THE FLOW OF FLUID SIMUL-