ECONOMIC ASSESSMENT OF DAYLIGHT AVAILABILITY CHANGES CAUSED BY NEW CONSTRUCTIONS

摘要

This paper presents a case study demonstrating new techniques to assess the financial impact caused by changes in daylight availability due to the construction of a high rise building in a city downtown. The entire site surrounding the building has been modelled with a Computer Assisted Design tool. A powerful daylight simulation tool was then used to compute Daylight Factors on all building facades, taking into account multiple reflexions of light in the streets. Local data on luminous climate were used to determine the variations in daylight availability in the buildings in hours per year. Finally, the financial impact related to the modification of daylight availability has been assessed, for the additional lighting consumption as well as the reduction of office rental values. The total losses for the surrounding buildings was found to be 130,000 $/year for a 50 meter high building and 200,000 $/year for a 100 meter high building.