Abstract
An innovative column attachment ventilation (CAV) was proposed for heating, ventilating and air-conditioning (HVAC) systems and its performance was evaluated through experimental investigation and numerical modeling. Airflow pattern, air temperature distribution, air diffusion performance index (ADPI), predicted mean vote (PMV), and draught rate (DR), were used as the performance indicators to investigate the air distribution performance. The ventilation effectiveness for heat removal in the CAV mode was compared with a conventional mixing ventilation (MV). The results showed that the discharged air from the linear slot diffuser can attach to the column and enter into the occupied zone creating air lake phenomenon. The airflow spread over the floor in a radial pattern behaved as a stratified air distribution like displacement ventilation (DV), providing good air quality and comfort level for occupants. Moreover, the heat removal effectiveness in the CAV was found to be higher than in the MV, i.e. 1.32 in the C-CAV and 1.29 in the S-CAV modes. The column attachment ventilation can achieve thermal comfort in the occupied zone without local discomfort caused by high vertical temperature difference and draught, and this ventilation strategy could be expected as a new and efficient air distribution pattern for different HVAC applications.
Highlights
With the development of building technologies and the demand for economic progress, large spaces are emerging in the civil and industrial fields such as shopping centers, subway stations, airport terminals, and factory halls
Similar to Displacement ventilation (DV), the airflow pattern in column attachment ventilation (CAV) was characterized by stratified flow, creating an air lake phenomenon in the occupied area, which provided the occupied zone with fresher and cooler air than the other zones
When operated in the occupied zone, the CAV mode was similar to DV mode, and can result in higher energy utilization when compared with the Mixing ventilation (MV) mode in a large space building with column structure
Summary
With the development of building technologies and the demand for economic progress, large spaces are emerging in the civil and industrial fields such as shopping centers, subway stations, airport terminals, and factory halls. When applied to large space buildings with higher cooling load and larger building span, DV systems are mostly combined with other systems such as cooled ceiling systems [15] and radiant floor cooling systems [16]. Another problem limiting the application of DV is space consideration. The typical locations of supply outlets are on the low side wall or floor These supply outlets typically take up considerably more occupied space than the outlets used in the MV system [17]
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