Abstract
Buildings globally are subjected to climate change and heatwaves, causing a risk of overheating and increasing energy use for cooling. Low- energy cooling solutions such as night cooling are promising to realize energy reduction and climate goals. Apart from energy performances, resilience is gaining importance in assessing the performance of the building and its systems. Resilience is defined as “an ability to withstand disruptions caused by extreme weather events, man-made disasters, power failure, change in use and atypical conditions; and to maintain capacity to adapt, learn and transform.” However, there is a clear lack of Resilience indicators specific for low energy cooling technologies. In this paper, the resilience of the night cooling in a residential building in Belgium is assessed for two external events: heat wave and shading failure. This paper shows the first attempt of a resilience indicator for night cooling as the effect on the shock of solar shading failure, heat wave or combination of both. It take 3.4 days to bring down the temperature below 25?, in case of shading failure and heatwaves compared to 9 hours in the reference case. Further research is needed to determine resilience indicators as a performance criteria of low-energy cooling systems.
Highlights
IPCC’s Special Report on Global Warming of 1.5°C concludes there is a growing risk of overheating in buildings and an increase in severity of heatwaves[1]
Focus should be on the low energy cooling technologies to mitigate climate change and overheating in buildings while respecting the energy reduction goals
The results of this study clearly indicate the necessity of resilience as performance indicator for the night cooling system
Summary
IPCC’s Special Report on Global Warming of 1.5°C concludes there is a growing risk of overheating in buildings and an increase in severity of heatwaves[1]. Focus should be on the low energy cooling technologies to mitigate climate change and overheating in buildings while respecting the energy reduction goals. To combat climate change, overheating in buildings and the parallel energy reduction goals, there is a need for passive cooling technologies. The state of the art report of Ventilative cooling in the framework of Annex 62[1], a study[4] on the performance of night cooling using uncertainty and sensitivity analysis and on the predictive performance of natural night cooling concluded that the efficiency of night cooling depends mainly on (1) thermal mass of the building and (2) local climate conditions, i.e. night-time wind speed and temperature swing of the ambient air. Studies on future climate scenarios suggests increase in night temperatures[5].
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