Abstract
In order to evaluate indoor air quality and ventilation effectiveness, it is necessary to comprehend properties of various ventilation systems. In this paper we describe the results of field measurement of ventilation effectiveness for four office rooms using age of air and air exchange effectiveness. The results are as follows. (1) In the case of air conditioning system and ventilation system using ceiling chamber for return air, the local air exchange effectiveness in the room is ranged from 0.8-1.2. (2) In the case of raised floor air supply system, the local air exchange effectiveness is ranged from 0.9-1.1, however in the case of ceiling supply chamber system is ranged from 0.8-1.0. (3) The room which is ventilated by duct system, local air exchange effectiveness becomes about 0.7-1.1. When supply outlets are closed to make bad ventilated area, local air exchange effectiveness of bad ventilated area becomes 0.8-1.0, in the other hand the release area of supply outlets becomes 1.0-1.1. (4) It is possible to evaluate ventilation characteristics of office space by local age of air and local air exchange effectiveness.
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