Paper Conference

Proceedings of BSA Conference 2015: Second Conference of IBPSA-Italy


Energy Saving Exploiting Light Availability: A New Method to Evaluate Daylight Contribution

Claudio Campanile, Francesco Leccese, Michele Rocca, Giacomo Salvadori

Abstract: Rhinoceros and Grasshopper have the extensibility which makes architects able to study forms, structures, acoustic behaviour, energy consumption, etc. as well as daylight availability: the most important aspect in this study. The software described has been useful to evaluate running costs including heating, cooling, electrical devices and lighting systems. The software used includes Ladybug and Honeybee; they connect the Radiance and Daysim engines to Grasshopper and Rhinoceros. The building analyzed in this study is a competition proposal for the New Town Hall in Remseck Am Neckar (Germany). The simulation started by designing the electric lighting system while the daylight availability was evaluated afterwards. The core study is the critical investigation of the daylight contribution necessary to satisfy the lighting demand. Two simulations were run: the first one followed the European Regulation EN 15193, the second one was based on Daysim. If these methodologies gave two equivalent results for the north-exposed offices, on the other hand the south-exposed rooms obtained slightly different values. The idea consists in developing a third method to use opposed to the others described before, called the ‘Octopus method’ (OM) and based on Octopus, a multi-objective evolutionary algorithm integrated within Grasshopper. The new feature the OM introduces is the annual illuminance data computation being different from Daysim. The latter just makes a multiplication between the illuminance deficiency and the required comfort level. The OM considers the comfort level throughout the year simulating the real illuminance distribution within the ambient of study and the effect of electric light system installed.
Pages: 239 - 246