The natural ventilation performance of buildings under alternative future weather projections

Different climate change projections, such as UK Climate Impacts Program (UKCIP02) and 2009 UK Climate projections (UKCP09), have generated a large quantity of data that represent a range of possible future weather scenarios. This article investigates the potential consequences of alternative scenarios for the natural ventilation of non-domestic buildings. The article considers future natural ventilation rates in example buildings, the risk of summer overheating and whether natural ventilation will be a viable thermal control option for future summers. The wind is obviously a key driver of natural ventilation, and a necessary component of building simulation weather files. Problems associated with the generation of wind data from UKCP09 for the natural ventilation analyses are discussed and the influence of differences in weather files on predicted performance considered. These differences are important to the understanding of the consequences for the wider use of UKCP09 derived weather data for building energy evaluation. Practical applications: Weather data are widely used in practice to evaluate the potential and performance of natural ventilation in non-domestic buildings. The predicted differences in future weather data will have direct implications for the design of naturally ventilated buildings, and engineers will need to be aware of the possible implications these climatic differences will create.

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