Warm air solar heater - has underground thermal storage with perforated ducts and ground level outlets

摘要

The air heater consists of an underground mass of pebbles in which are buried perforated ducts. The ducts have air outlets into the room at floor level. Heat stored in the thermal mass is given up to the room by radiation and conduction through the floor and by convection through the air ducts. Air is circulated from the top of the greenhouse by a fan and passes through the thermal mass. Heat can flow in either direction to heat or cool the mass. By adding filtration and humidification, air conditioning can be achieved.