高大空间建筑置换通风系统观众席舒适性研究

Thermal comfort of stands zone about displacement ventilation system in large space buildings

针对高大空间建筑置换通风系统的热舒适性问题,选取采用置换通风系统的高大空间建筑观众席典型区域,根据采暖通风与空气调节设计规范(GB50019-2003)的推荐参数,采用标准k-ε双方程湍流模型,利用CFD商业软件对该区域进行数值模拟,详尽地分析该区域的流场、温度场、PMV场等的分布.该区域内后排观众席有温度过高的可能;而前排观众席则可能有吹风感;顶部灯光辐射对舒适性影响较大.模型内的平均风速为0.03 m/s,平均PMV值为0.73.结果表明,大空间建筑置换通风系统观众席的舒适性可满足设计要求.

Aiming at the thermal comfort of displacement ventilation system in large space buildings, the typical zone of stands in large space buildings adopting displacement ventilation was selected to study the thermal comfort of this system. According to the parameters advised by Code for Desion of Heating Ventilation and Air Conditioning （GB50019 -2003 ）, the airflow in this zone was simulated numerically through CFD business software by employing the standard k-ε double-equation turbulence model. The field distribution of air flow, temperatureand PMV in this zone were analyzed in detail. It is possible that the temperature is higher in back rows and velocity of airflow is higher in front rows than designed parmeters. And the light radiations from the top of buildings impact largely on the thermal comfort. The mean velocity of airflow and PMV is 0. 03 m/s and 0. 73 respectively. The results of numerical simulation show that the thermal comfort of stands zone about displacement ventilation system in large space buildings can meet the demands of design.