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Nowadays, the flexibility for changes maintaining thermal comfort conditions is one of the main requirements of an office room to fully answer to the use and occupation needs. The underfloor air distribution system is being used in the office buildings to guarantee the integrated flexibility of the system with the furniture layout. The system supplies cooled air to the room from a pressurized plenum, passing through air diffusers located in the raised floor panels. The air diffusers can be adjusted or relocated by the room users themselves, making possible the control of the thermal conditions in their surroundings, according to their individual preferences. Though the underfloor air distribution system presents a lot of advantages with regard to conventional overhead distribution systems, there is still a lack of objective information and standardized guidelines, and the necessity of accomplishment of more researches about the subject. The introduction of Computational Fluid Dynamics presented an alternative for the experimental tests related to the study of airflow in rooms. Thus, for the development of the present study a CFD tool was used, the code FLUENT. The purpose of the present work is to present a strategy for the determination of the operation parameters of an underfloor air distribution system applied to office rooms. The strategy is based on the establishment of interrelations between the main parameters that define the airflow in rooms with the underfloor air Determinacao de parâmetros de operacao de sistema de distribuicao de arfrio pelo piso em ambientes de escritorios 2 distribution system: the input volume flux, the input air temperature and the pressure difference between underfloor plenum and the room. The use of this strategy enables the designer to identify several combinations of the operation parameters that result in one desired condition, aIlowing the choice of the most satisfactory option. Key-words: Air conditioning (HVAC systems). Computational Fluid Dynamics. Numerical Analysis.

Determinação de parâmetros de operação de sistema de distribuição de ar frio pelo piso em ambientes de escritórios.