Abstract
The study presented in this work is performed in a virtual chamber, similar to an existing experimental chamber, with dimensions of 4.50×2.55×2.50 m3. The chamber, occupied with twelve virtual manikins, is equipped with six tables, twelve chairs, one exhaust system and one inlet system, based in confluents jets system. In the exhaust system are considered six air ducts, located above the head level, connected to the ceiling area. The inlet system, based in four vertical ducts, with 0.15 m diameter, located on the corners of the chamber, are equipped with consecutive holes, that promotes horizontal jets near the wall. The results demonstrate that when the airflow rate increases the air quality number increases, the thermal comfort number decreases and the ADI increases slightly. The predicted percentage of dissatisfied index values show that the thermal comfort level is acceptable, the dioxide carbon concentration values show that the indoor air quality is near the acceptable value and the Draught Risk is acceptable.
Highlights
Several studies have been developed on the area of confluent jets ventilation systems [1]-[2]
The occupants seated in the corridor side present best thermal comfort level than the occupants seated in the wall side; The thermal comfort number decreases when the airflow rate increases; Table 1
For lower airflow rate the occupants seated in the corridor side present best indoor air quality level than the occupants seated in the wall side
Summary
Several studies have been developed on the area of confluent jets ventilation systems [1]-[2]. Several parameters are used to evaluate the local thermal discomfort, thermal comfort and indoor air quality levels. Draught Risk (DR) is used to evaluate the local thermal discomfort level that the occupants are subjected, carbon dioxide (CO2) concentration is used to evaluate the indoor air quality level, Predicted Mean Vote (PMV) index and Predicted Percentage of Dissatisfied (PPD) index are used to evaluate the thermal comfort level of the occupants and Air Distribution Index (ADI) is used to evaluate simultaneously the air quality, thermal comfort and contaminants and heat removal efficiencies. PMV and PPD indexes, parameters developed by Fanger [5], are applied to determine the thermal comfort conditions in conditioned spaces and they are used by ISO 7730 [6] to define three thermal comfort categories (A, B, C) requirements. ADI was presented and detailed in the studies of Awbi [7], for uniform environments, and Conceição et al [8], for nonuniform environments, and it allows to assess, in an integrated way, the overall performance of the ventilation system
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