Indoor Climate of an Open-plan Office Building Having the South-facing Large Window Designed with a Conception of "Semi-passive Control" : Part 2-Performance Measurement of Ventilation System by Age of Air

Abstract

In order to evaluate the performance of mechanical ventilation system, which is installed in a long office space of the east-west orientation, the ventilation efficiency at various points are measured. The ventilation system intakes outdoor air from the east side and exhausts indoor air to the west side. The measurements provide evidence that (1) the actual ventilation performance of investigated office space is almost the same as designed, (2) the difference between the step-up and the decay methods is very small, (3) the ages of air obtained by the step-up method using SF_6 are somewhat greater than those by the decay method using CO_2.