a home heated by the direct gain passive Passive solar solar method. South-facing windows act as solar collectors. Sunlight enters the living space, the energy is converted to heat at absorbing surfaces. and the heat is dispersed throughout the space and to the various enclosing surfaces and room contents. The windows can be covered at night with movable insulation to reduce Insulation heat loss. A massive masonry floor and back wall serve for heat storage and Thermal prevent overheating. The exterior overhang mass helps to prevent overheating in the summer South a typical Trombe wall installation. The massive concrete wall inside a glass window acts both as a collector and a heat storage medium The room air circulates by natural convection as shown. Heat is South also radiated by the wall into the living space 复旦大学环境科学与工程系 Department of Environmental Science and Engineering, Fudan UniversityA typical Trombe wall installation. The massive concrete wall inside a glass window acts both as a collector and a heat storage medium. The room air circulates by natural convection as shown. Heat is also radiated by the wall into the living space. A home heated by the direct gain passive solar method. South-facing windows act as solar collectors. Sunlight enters the living space, the energy is converted to heat at absorbing surfaces, and the heat is dispersed throughout the space and to the various enclosing surfaces and room contents. The windows can be covered at night with movable insulation to reduce heat loss. A massive masonry floor and back wall serve for heat storage and prevent overheating. The exterior overhang helps to prevent overheating in the summer. Passive solar