I have been thinking about how to consider infiltration for load calculations; particularly for multifamily buildings for new and adaptive reuse projects.
New Buildings: Modern multifamily buildings often use advanced materials and construction techniques, improving insulation and airtightness. This reduces infiltration, enhancing energy efficiency. This usually ends up at a rate of approximately 0.3 AHC. The codes and regulations make this an easy variable to predict.
Historic Buildings: In contrast, old and historic buildings might have been built with less efficient materials and methods. They often have gaps, single-pane windows, and outdated insulation, leading to higher infiltration rates.
The question is: how do we make reasonable assumptions for infiltration for these projects? How much higher is the infiltration compared to a new build?
Would love to hear your thoughts, research, and experiences regarding this topic!