Solar heating system

A solar heating system comprising a hollow solar heat collector including a transparent top wall, a heat insulating bottom wall, and a heat absorber element between said walls to absorb heat from the sun's rays passing through said top wall and to heat air adapted to be circulated through said collector in contact with said element;

• a heat storage device including an insulated tank filled with liquid heat storage medium, and vertically spaced apart lower and upper heat exchangers having air passages extending through the lower and upper portions of said tank in heat exchange relation with said medium;
• air ducts intercommunicating said collector and lower heat exchanger in closed loop arrangement;
• blower means in one of said ducts operative, when energized, to induce flow of hot air from said collector through said lower heat exchanger for transfer of heat to said medium and back through said collector for re-heating of the air;
• and other air ducts and another blower means to conduct room air to be heated through said upper heat exchanger for transfer of heat stored in said medium to the room air and to conduct the heated room air from said upper heat exchanger to a room space;
• said lower and upper heat exchangers each comprising a length of metal duct surrounded by said medium and a series of longitudinally spaced banks of open-ended vertical and laterally spaced apart heat-conducting tubes filled with said medium whereby hot air from said collector flowing through said lower heat exchanger transfers heat to said medium around said duct and in said tubes of said lower heat exchanger, and whereby said upper heat exchanger transfers heat from said medium through said duct and vertical tubes of said upper heat exchanger to room air flowing through said upper heat exchanger.