2.2.5. Residual lifetime of air to be vented
The index IECV described above does not incorporate any concept of time. Thus, we calculated the residual lifetime of the air to be vented as shown in Fig. 6. As the exhaust amount from opening increases, the region with higher residual lifetimes shrinks. In contrast, as the exhaust amount from opening decreases, the region with higher residual lifetimes increases.