An Experimental and Numerical Study on the Effect of Column Layout on Air Distribution and Performance of Column Attachment Ventilation
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An innovative column attachment ventilation (CAV) was proposed for heating, ventilating and air-conditioning (HVAC) systems, which can directly deliver supply air to the occupied zone without over conditioning the upper zone of the room. The effects of the column layout (i.e. uniform, centralized, dispersed and crossed distribution) in a typical four columns room on the air distribution of CAV were studied through experiments and simulations. Airflow pattern, air temperature distribution, air diffusion performance index (ADPI), and ventilation effectiveness for heat removal were used as the indicators to investigate the ventilation performance. In CAV mode with a uniform column layout scheme, the experimental results indicated that airflow spread over the floor in a radial pattern behaved as a stratified air distribution like displacement ventilation (DV), resulting in an air lake or air pool phenomena in the occupied zone. In the simulation cases, it can be seen that a reasonable air distribution and acceptable indoor environment can be achieved by CAV mode with different column layout schemes. The results indicated that the CAV mode could be an efficient air distribution method and demonstrated the technical feasibility of applying the CAV in the space with different column layout schemes.
KeywordsColumn attachment ventilation Air distribution Column layout Performance evaluation Large space buildings
This study was jointly funded by the National Natural Science Foundation of China (No. 51408477), the Innovative Talent Promotion Plan of Shaanxi Province (No. 2018KJXX-087), and the Natural Science Foundation of Education Department of Shaanxi Province (No. 17JK0450).
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