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Assessment of the summertime thermal performance of natural, mixed-mode and mechanical ventilation strategies in newly built schools under UKCIP02 climate change scenarios and the efficacy of potential adaptation strategies
Abstract
This study investigated three newly-built Central London schools that employed natural, mixed mode and mechanical ventilation strategies for the provision of thermal comfort. The operations of the respective ventilation strategies were modelled for summertime overheating using a medium-high climate change scenario as defined by the United Kingdom Climate Impacts Programme 2002 (UKCIP02) for the present day, the 2020s, 2050s and 2080s. The points at which the designed ventilation strategy failed were determined, and adaptations were devised and modelled to alleviate the occurrence of summertime overheating. Results showed that the use of cross-ventilation and split-duct systems, in conjunction with night cooling could prolong natural ventilation strategies till at least the 2050s without significant overheating. Beyond the 2050s, comfort cooling was recommended as a low-energy hybrid solution to cope with increasing external temperatures. Furthermore, classroom geometry was also determined to have an effect on summertime thermal performance.
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Many non-domestic buildings, built recently in the UK, use natural means to provide ventilation for indoor air quality and thermal comfort. This paper presents monitoring results obtained from such a purpose built naturally ventilated educational building. Its performance during the summer is discussed based on monitored results. Using thermal and ventilation modelling, the paper also discusses the optimisation of the building’s summer performance. Recommendations on the selection of appropriate ventilation strategies in relation to the prevailing external conditions are derived and the appropriateness of the control methods is discussed.