Abstract: An extended Gebhart–Block model for large space buildings is proposed in this paper, which is used to predict the vertical temperature distribution of hybrid ventilation. Natural ventilation coupled with air-conditioning is described with a mathematical model. The indoor thermal environment formed by the air-conditioning and the natural ventilation can also be conducted for the potential analysis and optimal use of the natural ventilation. Experiments were carried out in an atrium building in Shanghai Research Institute of Building Sciences. This paper describes aforementioned model, and it is found that the calculation results implying this model agree well with the measurement data. [Copyright &y& Elsevier]
Kong, Qiongxiang, Zheng, Weirong, Feng, Ji, He, Xiao, Yan, Yan, and Fu, Zhibo
Subjects
ATRIUM buildings, VENTILATION, AIR flow, SPACE cooling, AIR quality, HEATING & ventilation industry
Abstract
The accurate numerical simulation of large space airflow needs large computational quantity and long computation time usually. However, parallel computing is a good method to increase the speed of simulation. In this paper, the indoor airflow and thermal environment of a ventilated atrium with large space is simulated using the paralleling solver of FLUENT software, and the effect of two domain partitioning methods and various number of subdomains after domain partitioning on the simulated results are discussed. The calculated results show that the calculation time significantly reduced and the speedup rises from 1 to about 3 when the number of cores increases from 1 to 5. Furthermore, Principal Axes method has smaller wall times and higher speedups than Cartesian Y-Coordinate method. In addition, the number of subdomains should be controlled reasonably according to the number of cores because parallel computing needs the added boundary conditions through artificial hypothesis. [ABSTRACT FROM AUTHOR]