Building facade optimization for maximizing the incident solar radiation Kyane Bomfim 1 , Felipe Tavares 2 1,2 Faculty of Architecture – UFBA 1,2 {kyane.bomfim|felipe.tavares}@ufba.br The technological breakthrough on photovoltaic facades and the high potential for installing photovoltaic (PV) systems in the city of Salvador are the motivation for this article. This case study explores the feasibility of implementing solar energy technology on a building facade, proposing a design method for optimizing insolation performance by the form-finding process in a parameterized shape. The goal was to generate a parametric design workflow, in which it could be found some facade shapes, generating triangle and quadrilateral supporting grids, leading to better results in the total amount of radiation in comparison to the basic flat facade. In these supporting grids were evaluated also the fitting in the distribution of quadrilateral commercial PV cells, measuring its geometric compatibility. By the results, it could be verified the gains and losses in PV potential in several instances obtained by the form-finding process, as the potentials to consider this in the design of every building. Keywords: Radiation skydome, Shape parameterization, Form-finding, Genetic Algorithm, PV facade INTRODUCTION On the mid-twentieth century Third Industrial Rev- olution, the capitalist urban-industrial environment emerged and has been intensified until today, trig- gering the production of machines and competitive technological development (Silva et al. 2016). Con- sequently, there has been an exponential increase on energy demand, which is the main focus of multiple global discussions for promoting renewable energy, as in the Renewable Energy Policy Network for the 21st Century (R.E.N.21 2018). The global building energy consumption could increase by 50% to 2050, without assertive energy ef- ficiency action (I.E.A. 2016). The use of solar energy in buildings is critically important for reducing expo- sure to global warming impacts and associated envi- ronmental costs. In order to mitigate environmental problems, it is possible to integrate active solar tech- nologies into buildings (Probst and Roecker 2012). The Photovoltaic (PV) system is a type of active solar technology. In it, devices made with semiconducting material turn sunlight into electricity, generating a di- rect current when sunlight hits a PV panel, which will then be converted into alternating current through an inverter. Photovoltaic panels often have been installed on rooftops, because on horizontal surfaces, they can have an optimal tilt angle based on geo-location. While on vertical facades, this inclination may not be optimal, even though they hold significant potential - Simulation - PREDICTION AND EVALUATION - Volume 2 - eCAADe 37 / SIGraDi 23 | 171
Building facade optimization for maximizing the incident solar radiation
Jun 28, 2023
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