SHADING - A DESIGN TOOL FOR ANALYZING MUTUAL SHADING BETWEEN BUILDINGS

A method and a model for analyzing visually and quantitatively mutual shading between buildings is presented. The method allows fast and eff icient calculation of the ratio between insolated and total surface ar eas of any given examined object that is shaded by other irregular and nonplanar elements. The calculation of this ratio is carried out for all the months and hours for which either shading or insolation is req uired. The information obtained may serve as hourly input data for any dynamic simulation model which evaluates the thermal performance of t he different external or internal shading systems. For a visual and a qualitative evaluation of the shadows among buildings, the suggested m odel permits a very realistic representation, in which the light sourc e is defined according to the azimuth and the altitude of the sun at t he particular time of examination. The self shading and brightness of the different surfaces and the shadows cast by the different elements at the designated time are then generated and can be evaluated visuall y. The method is demonstrated by a case study.