(CS2.5) Améliorer l'efficacité énergétique des bâtiments patrimoniaux, une approche par les systèmes mécaniques

Over the last decade, the goal of reducing building energy usage has moved to the forefront of design. For a new building, the form can be optimized to minimize energy usage, wall and roof assemblies can incorporate materials with high R values and tight construction, and high performance glazing can be selected to reduce solar heat gain. When considering an existing historic structure, many of these options are not feasible. In these cases, energy savings can be achieved through an efficient mechanical system tailored to fit within the existing historic building with minimal impact to the historic resource itself. Specific strategies are presented as they have been applied to the following historic structures along with energy savings. Through modelling, we can determine which portions of the building we should focus on for improvements and which historic fabric elements are actually improving the performance of the building. In addition to project examples, energy code compliance considerations including ASHRAE 90.1 and 189.1 will be discussed with strategies for improving building energy efficiency without negatively impacting the historic fabric of the structure. Finally a description of commissioning and how it fits into planning for historic facility planning is provided.