DEVELOPMENT OF WIND ENVIRONMENT DATA-BASE FOR COMPREHENSIVE ASSESSMENT SYSTEM FOR BUILDING ENVIRONMENTAL EFFICIENCY ON HEAT ISLAND RELAXATION

Abstract

A new assessment system named CASBEE-HI (Comprehensive Assessment System for Building Environmental Efficiency on Heat Island Relaxation) has been developed for evaluating the effects of various countermeasures related to building design on heat island relaxation. In CASBEE-HI, environmental efficiency concerning the heat island relaxation (BEE_HI) is defined as Q_HI/L_HI, where Q_HI is the quality of outdoor thermal environment within a building site and L_HI is the loadings emitted from this building site to increase the heat island effects in its surroundings. To assist the evaluator to examine the wind environment, two different scale wind environment databases were developed. In the present paper, wind environment databases for Tokyo and Osaka are described. The present Tokyo database includes results of three-dimensional CFD analysis in which all the existing buildings in the special 23 wards of Tokyo are reproduced in three-dimensional geometries in a grid network of approximately 500,000,000 meshes with a spatial resolution of 8 m in the horizontal directions.