A SERIES OF INVESTIGATIONS ON THE URBAN SURFACE CONDITIONS FOR URBAN CLIMATE MODEL CONSISTING FEATURES OF ANTHROPOGENIC HEAT FROM HVAC SYSTEM AND URBAN GEOMETRIC FIGURE

Abstract

First, the authors performed the investigations on the released height of anthropogenic heat from HVAC system. The subjects of investigation are 203 buildings in the central city of Fukuoka and 111 buildings recorded in the database of HVAC system of a certain journals. From these investigations, following features are summarized. 1. The ninety percent of buildings with less than 5000 square meters of building area adopt the air-cooling type of heat disposal equipment, so-called cooling tower, which are mainly sited at the each floor level. 2. The fifty percent of buildings with more than 5000 square meters of building area adopt the water-cooling type of heat disposal equipment of HVAC system, which are mainly sited at the roof. Secondly, the investigation on the urban geometric figure was conducted using the GIS data of Tokyo and Fukuoka. The features of vertical distribution of both roughness volume density and building wall area density were classified with the gross ratio of building volume. And the histograms of building area, floor area, story, distortion factor and aspect factor are presented, which are grouped into 6 classed according to both the gross ratio of building volume and building plan area fraction.