Abstract | The consideration of environmental quality in buildings became prominent in the Modernist movement in the UK and on the international scene, after the Second World War, including the emphasis on daylight access, particularly in educational buildings. The Marylebone building of the University of Westminster (1970s), in central London, is an example of this architectural trend. With rooflights, tilted ceilings, double height spaces and other features, this is a late modernist example of optimised daylighting design in educational buildings in the United Kingdom. However, the north-south symmetrical approach to the rooflights and the distribution of internal spaces raise questions about the efficiency of daylight. Hence, the aim of this technical study was to assess the daylight performance of the Marylebone building, considering its original and current layouts, with the use of Climate-Based Daylight Modelling (CBDM). Performance criteria included Useful Daylight Illuminance (UDI), Daylight Factor (DF), Illuminance levels and Glare Probability. Among the main results, it was found the achievement of the minimum threshold of 300 lux for most of the year (equivalent to 2% DF). Risks of glare were identified closer to windows and under the rooflights on the south side. It is concluded that the daylight strategies of the project were attuned to the activities and furniture layout of the atelier studio of the 1970s but not fully suitable for the use of personal computers that replaced the drawing boards in the 1990s, due to the excessive illuminance levels and penetration of direct solar radiation, leading to the recent insertion of internal blinds. |
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