Equivalence and Superposition in ASHRAE 62.2

Standard 62.2-2016 added a new section that includes provisions for real-time tracking of variable ventilation.  Smart ventilation controls are permitted to shift ventilation from times of high energy penalty to lower energy penalty, with the potential for significant ventilation-related energy savings. An ongoing initiative within the committee is an improvement to the calculations that combine natural infiltration with mechanical ventilation. These new calculation methods are intended to account for non-linear air flow interactions. This presentation discusses the technical background behind these changes and give examples of application of the new calculations.