Evaluation of daylighting performance in a retrofitted building facade
conference contributionposted on 26.07.2017 by Doris A. Chi Pool, Eleonora Brembilla, John Mardaljevic
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This paper analyses two main renovations of a University building façade retrofit from the viewpoint of annual daylighting improvement. Currently, this building consists of some teaching rooms connected by a hall but it is expected that this arrangement will change in order to accommodate two open-plan spaces for architecture students. The renovated design will increase the height of the North-East windows and introduce shading devices on the South-West facade. These renovations were explored to determine if the internal luminous conditions will maintain adequate levels. Five degrees of visual screening (100, 90, 70, 45 and 34%) and two slats positions (horizontal and vertical) were evaluated in relation to the building with no screens. Climate-based daylight modelling (CBDM) was carried out by using Diva-for-Grasshopper. The study revealed that effectiveness of convergence testing depends strongly on the choice of CBDM metrics employed as a diagnostic – an important consideration when modelling light transfer through louvres. Results recommended using louvred panels with no more than 70% of visual screening as higher percentages decrease useful illuminances over the range 300-3000 lux (UDI-a), to less than 50% of the occupancy time. Furthermore, vertical louvres were better suited to increase UDI-a than horizontal slats.
Ms. Chi Pool acknowledges the support of CONACYT (Mexico), IUACC (Spain) and Erasmus+; Ms. Brembilla acknowledges the support of the EPSRC and industrial partner Arup (London, UK) and Prof. Mardaljevic acknowledges the support of Loughborough University.
- Architecture, Building and Civil Engineering