THE METRICS AND METHODOLOGY IMPLEMENTATION FOR ANALYSING DAYLIGHTING AND ENERGY USE IN URBAN DENSE BUILDING BLOCKS

DAYLIGHTING AND ENERGY USE IN URBAN DENSE BUILDING BLOCKS

Abstract

Energy use and daylighting is very important in a dense building block. While planning a dense building block, we investigate which matrices are relevant to investigate daylighting and energy use. A set of methodology is use to assess the performance of a dense urban building block in terms of energy use and daylighting. A work flow is also described to use for a new dense building block. In metropolitan areas, daylight is a limited resource. A considerable percentage of the sky and light is typically blocked out by the urban building mass in rooms located in an urban setting. Because of the limited direct lighting potential, sunshine reflected from exterior surfaces is a significant source of light in the space. The authors provide a collection of logistic mathematical models for estimating the quantity of daylight and the energy requirement for illuminating a space. The models were based on a database of Daysim simulation results for a sample room, with parameters like as location, orientation, exterior obstructing angle, window size, glazing visible transmittance, and room depth being modified parametrically. The estimates that were obtained using the models showed, compared to the corresponding simulations results, a coefficient of variation CV lower than 16% for all the models, with one exception, having a CV up to 30%. The aim of the study was to elaborate models that could be used to incorporate daylighting strategies since the earliest stages of the building design process. Using the models, it is possible to predict the annual daylight amount in a room and the corresponding energy consumption of the lighting systems starting from some given room features to guarantee a target value of energy demand for lighting or of a daylighting metric.