Paper Conference

Proceedings of eSim 2020: 11th Conference of IBPSA-Canada


A Parametric Study on the Relationship between Geometric Envelope Parameters and HVAC Systems

Mariana Barssoum, Edward Vuong, Iain Macdonald
National Research Council Canada

Abstract: This paper examines the impact of building orientation, number of storeys, aspect ratio, and building geometrical shapes (Courtyard, Rectangular, T-shape, U-shape, and Lshape) on total annual energy demand of National Energy Code of Canada for Buildings (NECB) 2017 (National Research Council of Canada 2017) compliant reference archetypes. The study was conducted using OpenStudio and Parametric Analysis Tool (PAT) to simulate seven archetypes (mid-rise multi-unit residential, retail strip mall, medium office, full service restaurant, primary school, warehouse, and small hotel) located in Victoria, BC, Canada. Results showed that for most of the archetypes, excluding small hotel and multi-unit residential, rectangular shaped buildings were the most energy efficient; whereas the Lshaped buildings had lower energy use for other two archetypes. Furthermore, it was found that changing the number of storeys for the medium office and retail strip mall from two to three (while keeping all other parameters fixed) resulted an increased in annual total energy consumption by 54 and 60%, respectively; this is attributed to the modelling rules in the NECB. This is significant because in practise, it permits the design of less efficient buildings by simply adding a storey for a fixed floor area. Lastly, a detailed study for primary schools and small hotels was conducted across the six climate zones in Canada. An optimized set of parameters and articulation of these parameters is presented. This study will benefit relevant architects and stakeholders in the early design stages across Canada and future work will expand the study to other locations and archetypes.