The time-based metrics of thermal autonomy and passive survivability and their correlation to energy use intensity

The aim of this paper is to demonstrate an approach for analyzing robust passive measures through the time-based metrics of thermal autonomy and passive survivability. For this study, parametric simulations of multi-unit residential buildings are conducted in a given climatic location. The results are discussed using these two metrics to ensure architectural parameters, such as building form, orientation and fabric, are intelligently selected to improve environmental performance and resilience of buildings. Furthermore, the paper shows how time-based metrics can be correlated to enhanced energy performance, particularly comparing with enegy use intensity. Current energy-related metrics are aimed at the use of engineers more than architects in the discussion of building performance. Compared to energy metrics, such as Watts and kilowatt-hours, performance metrics based on a measure of “time" are more intuitive. The approach presented in that paper can provide a common language and fill the communication gap between architects and engineers in the discussion of building performance. In addition, architects may also maintain better control on their aesthetic and functional design values without compromising performance.