Exploring sunlight in real estate models. Application on five Chilean cities

Explosive growing of building stock in the last years on the Chilean cities has been reflected on skyscrapers real states nodes that burst urban form. Externalities are observed as shadows that impact on thermal and luminous conditions above neighbourhood buildings and urban space. Those buildings have been constructed according to urbanism normative but they affect incident sunlight on facades and ground. Consequently it decreases possibilities to capture and use as clean renewable energy, relevant issue in current context of Net Billing. The objective of the paper is to explore different ways of plot site changing building height but keeping built coefficient in five Chilean cities: Santiago, Valparaiso, Concepcion, Temuco, and Puerto Montt. Methodology consists of computational 3D modelling and energy simulation of spatial configuration. Cities selected are located on waterfront or on central valley in the middle of the Chilean territory in which there are the most urbanized areas with significant real state growing. Results shows higher energy values on facades of spatial configuration with high buildings and lower ones on ground. Thus a discussion is highlighted whether current urban ordinance should promote sunlight capture on private (facades) or public space (ground) or simply both of them.