Question-and-Answer Resource for the Building Energy Modeling Community
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If you are trying to represent the actual physics of infiltration, then you need to look at values of infiltration that are appropriate for your building type (see more info below). If you are using infiltration rate as a calibration parameter that you adjust so that your energy predictions match reality, then I advise you to find other parameters to adjust and go back to a more physically appropriate infiltration rate.
Infiltration is one of the parameters with the highest uncertainty for several reasons including 1) it changes in time and varies around the building, 2) there can be lots of leakage points on buildings that are not well known, 3) opening and closing of doors for people and equipment entering/leaving can sometimes dwarf actual infiltration but is often left out of the model. This is one reason why I advocate for using probabilistic modeling and actually propagating the uncertainty through the model.
Besides PNNL 18898 "Infiltration Modeling Guidelines for Commercial Building Energy Analysis " mentioned in a previous answer, there are several places to get information about infiltration in real buildings and modelling
Alex Berge of Chalmers University, did an MS thesis on the topic.
A good list of resources for measured infiltration can be found in AIVC TN 66:Building air leakage databases in energy conservation policies: analysis of selected initiatives in 4 European countries and the USA
Malcom Orme and Nurul Leksomono put together a ventilation modeling guide in AIVC Guide 5: Ventilation Modelling Data Guide.
Unfortunately, the AIVC papers/reports are not publicly available, but if you are in the right country, you can get free access.
Good Luck!
