Mitigating summertime overheating is increasingly viewed as a key issue in urban planning -a warming climate and increasing urbanisation will exacerbate the problem. The effectiveness of green and cool roofs at reducing summertime overheating was assessed for a naturally ventilated, poorly insulated office roof in London. This was contrasted to the application of retrofitting traditional insulation. The new Chartered Institute of Building Service Engineers overheating criteria was used to assess the level of overheating as predicted by a whole building thermal simulation model. The impacts of the roofing strategies were split into the direct and indirect effects. The indirect effects of the roofs were modelled using microclimatic modelling software. The results indicate the direct effects of green and cool roofs at reducing overheating are much greater than the indirect cooling effect. A non-insulated cool roof was found to be the most effective strategy. By insulating the roof, the level of overheating was slightly reduced. Non-insulated green and cool roofs were more effective than insulated roofs at reducing levels of overheating. When using a 2050 weather file, the building frequently overheated without the use of green or cool roof.
The new CIBSE design summer years (DSYs) for London Weather Centre, Heathrow and Gatwick in London are now available for three baseline years: 1976, 1989 and 2003. This study tested how these different design summer years impacted the assessment of overheating in a naturally ventilated office in London. Two office designs were tested, an uninsulated and one retrofitted with insulation and night cooling. The choice of baseline year impacted the level of overheating for both the uninsulated and retrofitted models. Tested in the more severe years, 1976 and 2003, the offices experienced the highest levels of overheating. When an office was retrofitted and night cooled, the choice of location had more of animpact on overheating due to the urban heat island effect. London Weather Centre and Heathrow experienced higher levels of overheating than Gatwick. The study highlights the need for designers to carefully consider how the differences between the weather files will impact their overheating assessment depending on their buildings’ fabric and ventilation design.
Practical application: This study provides initial testing of the how the new CIBSE design summer years impact overheating within a naturally ventilated office in London. Initial analysis of the weather files highlights the differences between locations and baseline years. These differences are then shown to have an impact on overheating depending on the building fabric and ventilation strategy. The results highlight how important it is that practitioners understand how both the weather variables and building and ventilation design will impact the predicted levels of overheating.
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