THERMAL CHARACTERISTICS OF A DOUBLE-GLAZED EXTERNAL WALL SYSTEM WITH ROLL SCREEN IN COOLING SEASON

The double-glazed external wall (double-skin) system is an effective passive technique that can decrease solar heat gain into the building. Detailed information concerning the thermal characteristics of the double skin is necessary to accomplish a good design for thermal comfort and energy-saving. In this paper, the 3-dimensional thermal characteristics of the double skin that had the openings partially installed and was partially shaded by the adjacent building were investigated by a field measurement. To that end, field measurements were conducted at a double-skin exterior wall (8.5 m high and 27.0 m wide) installed in an atrium located in the west of an existing building, during cooling period for typical summer conditions. Maximum air change rate of natural ventilation through the bottom opening up to the top opening is about 20~25 (1/hour), the reduction ration of total solar heat gain to compared with those of non-natural ventilation is about 25%. The exhaust solar heat gain is 24kw and is about 100w/m2 per inner glass surface area of the double-skin. The double-skin was verified its effectiveness of reducing the air-conditioning loads by field measurement during the cooling