Abstract
A wall cavity with two open slits at top and bottom is expected to regulate overheating of the exterior walls by solar irradiation. This study focuses on estimating the effect with the simulation in steady-state. For a cavity wall which has 3000 mm height, 50 mm thickness and 40% aperture ratio of openings, scores of calculations were excuted. With the condition of 200 W/ m 2 solar irradiation, 15°C temperature difference between interior and exterior and 5 m 2 K/W heat resistance value of the solid part wall, the excution results indicated that the increasing rate of heat resistance by cavity was 21%, more temperature difference provided less efficiency, and more solar irradiation generated more effeciency. To define the ability of the cavity, apparant thermal conductivity of the cavity was estimated. The thermal conductivity of cavity (0.022 W /mK) can be smaller than good insulation materials under the condition of large solar irradiation value (600W/m2). Results proved that the cavity wall had enough performance for reduction of cooling load.
