1. INDIRECT-GAIN SUNSPACE Sunlight South-facing glazing Air Overhang Heat is transfered to interior by conduction through common wall Trombe wall

2. ISOLATED-GAIN SUNSPACE Heat is transfered to interior by convection trhough opening in insulated common wall Sunlight South-facing glazing Water wall

3. WINTER DAY Sunlight Sun is absorbed by masonry floor and walls Low sun angle provides deep sun penetration Ventilation South-facing glazing Shutters raised

4. WINTER NIGHT Masonry floor and walls release stored heat radiation and convection Moon Shutters lowered at night to reduce heat loss through glazing

5. SUMMER DAY The heated air rises at the top and is left by vents Cool air circulates through the building by means of vents upstairs Cool air

6. WINTER DAY AND SUMMER DAY In a winter day the sunlight falls on the glass and lets heat In a summer day the overhang prevents the sunlight influences the glazed avoiding heat