A numerical study on the effect of column layout on air distribution and performance of column attachment ventilation
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A numerical study on the effect of column layout on air distribution and performance of column attachment ventilation
School of Building Services Science and Engineering, Xi'an University of Architecture and Technology, Shaanxi, Xi'an 710055, China
Abstract
Keywords
Based on the structural characteristics of existing buildings and the disadvantages of current mixed
column attachment ventilation,
ventilation mode in the application to large space buildings, an original column attachment
air distribution,
ventilation (CAV) has been proposed. In this study, the experiment utilized a room space with four
column layout,
columns uniformly distributed in the space to visualize the movement of attached airflow along
performance evaluation,
the cylinder surface and the floor, the numerical technique was employed to study the effects of the
large space buildings
column layout (i.e., uniform, centralized, dispersed, and crossed distribution) on the air distribution of CAV mode in a standard four-column full scale model of a shopping mall. Seven indices, including airflow pattern, air diffusion performance index (ADPI), air temperature distribution, heat removal effectiveness, draught rate (DR), predicted mean vote (PMV), and carbon dioxide (CO2) concentration, were used to assess the ventilation performance. In the CAV mode with a uniform column layout
Research Article
Haiguo Yin (), Linna Li, Rui Wu, Yuanyuan Wang, Angui Li
Article History Received: 23 December 2019 Revised: 14 July 2020 Accepted: 24 July 2020
scheme, the experimental results indicated that the air supply flows downward along the wall
© Tsinghua University Press and
surface, forming a secondary attachment with the ground and spreading along the floor in a fan
Springer-Verlag GmbH Germany,
radiation flow mode. Further, an “air lake”—like speed and temperature distribution similar to displacement ventilation (DV) was formed in the occupied zone. In all simulation cases, it was
part of Springer Nature 2020
found that the average air velocity was less than 0.25 m/s in occupied zone, the effectiveness for heat removal was more significant than 1.0, DR value was less than 20%, the PMV level can also satisfy most people. The average CO2 concentration was around 470 ppm in the occupied breathing zone. These results indicated that the CAV mode could be an efficient air distribution method. They demonstrated the technical feasibility of applying the CAV in the space under different column layout schemes.
Introduction
In recent years, large space buildings have developed rapidly around the world. Due to the significant height and span, and a great number of personnel and equipment, the energy consumption of large space buildings is very high, most of which are used in heating, ventilation, and air-conditioning (HVAC) systems (Han et al. 2019). Therefore, reducing the energy consumption of HVAC systems in large space buildings is attracting more and more attention of HVAC specialists and researchers (Wang et al. 2014; Zhang et al. 2015; Liang
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