Currently, VRs per person are normally estimated from peak indoor CO2 concentrations, assuming occupancy and VR are stable for a sufficient period to reach equilibrium. But the assumed equilibrium conditions are often not attained because VRs and occupancy vary over time. The goal of this task is to employ a transient mass balance model for measuring VRs using CO2 concentrations and occupant counts.

• Install CO2 sensors and occupant counters in two buildings. 

• Collect data to determine the accuracy of transient method of determining VRs.