BS2025 / Program / Implications of window opening assumptions in English overheating regulation on assessing residential heat resilience under uncertain climate

Implications of window opening assumptions in English overheating regulation on assessing residential heat resilience under uncertain climate

Location
Room 3
Time
August 25, 2:00 pm-2:15 pm

Climate change causes more frequent and severe heatwaves in temperate regions, posing a grave risk of heat exposure to dwellings. To address this, the United Kingdom government recently implemented regulations to mitigate overheating in English and Welsh homes. Approved Document O (ADO), as its accompanying technical guidance, recommends a mdoelling approach to demonstrating regulatory compliance for summertime thermal comfort, which is based on the Technical Memorandum 59 (TM59) methodology with modifications to the standardised window control behaviours. Previous studies have highlighted adaptive ventilation as a crucial measure to enhance heat resilience of future homes; however, the impact of such modifications on overheating prediction have not been quantitatively discussed, particularly in consideration of climate uncertainty. This paper aims to investigate the implications of the tailored window control rulesets in ADO on heat resilience evaluation for future homes under uncertain climatic condistion. Results suggest a statistically significant difference (p < 0.001) in overheating assessment results between TM59 and ADO,withthegreatesteffectobservedontheexpected overheating risks in nocturnal bedrooms. Quantitative evidence also reveals the critical role of nighttime ventilation in enhancing thermal comfort in future summers regarding both effectiveness and robustness.

Presenters

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