Ceiling mounted personalized ventilation (PV) aims to provide clean outdoor air into human breathing zone without affecting indoor aesthetics in energy-efficient manner. In steady state, its performance depends much on the ceiling mounted air terminal device (ATD) because supply air momentum, other than human body thermal plume and ambient air flow, is the major driving force in the micro-environment of occupied zone. A typical office workplace consisting of ceiling mounted PV ATD and ambient air supply diffusers was simulated. One person was seated and another moving person was simulated by dynamic meshes in computational fluid dynamics (CFDs). A new index, computational personal exposure effectiveness (PEEc), was utilized to assess the performance of ceiling mounted PV system in regard to inhaled air quality under influence of moving person. Meanwhile, influence of evenly distributed ceiling mounted PV ATDs on inhaled air quality was also studied. According to numerical results, stability of ceiling mounted PV under dynamic environment with moving person was acceptable with minor changes of PEEc and inhaled air quality could be improved over larger occupied area for both seated person and moving person.
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