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Evaluation of daylighting performance in a retrofitted building facade

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conference contribution
posted on 26.07.2017, 13:36 by Doris A. Chi Pool, Eleonora Brembilla, John MardaljevicJohn Mardaljevic
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

Published in

Passive Low Energy Architecture (PLEA)


CHI POOL, D., BREMBILLA, E. and MARDALJEVIC, J., 2017. Evaluation of daylighting performance in a retrofitted building facade. IN: Proceedings of PLEA 2017, Edinburgh, 3rd-5th July 2017.




AM (Accepted Manuscript)

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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

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This paper was presented at PLEA 2017 and is also available at http://plea-arch.org/plea-proceedings/.




Edinburgh, UK