Abstract
When assessing a buildings' performance under overheating conditions there is a need to identify extreme hot years (EHYs) for a given climate location. Different types of EHYs can be selected depending on the criteria used for their selection, such as long, intense, or severe heatwaves defined based on dry-bulb temperature and other thermal comfort indices. However, the effect of the EHY type on the extent of indoor overheating has not been quantitively evaluated. The selection of multi EHYs also complicates the overheating assessment process. Therefore, an investigation was undertaken to explore the suitability of different EHY when assessing the extent of indoor overheating in buildings. In this study, the “Percentage of Synchronization” (POS) of outdoor and indoor-based extreme years was proposed as an approach to the selection of EHYs. A higher value of POS for a given EHY implied that there was a more significant risk for indoor overheating to occur. Thus when evaluating different EHYs, the most suitable choice in EHY would then be selected as the one with the highest POS value. The proposed method was demonstrated for residential archetype building models for five different climate zones. In the selection of EHYs for building overheating analysis, the thermal-based index was confirmed to be more suitable than the temperature-based index in the selection process; in the same context, the heatwave intensity and severity are more important than the duration of the event. Representative EHYs for each of the cities studied were identified; these include: 2010 (Ottawa and Montreal), 2013 (Toronto), 2006 (Baltimore), 1992 (Phoenix), and 2005 (Houston).
Published Version
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