Thermal stratification level of low sidewall air supply with air-conditioning system in large space
Thermal stratification level of low sidewall air supply with air-conditioning system in large space
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发表时间：
2009
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通讯作者：
黄晨;蔡宁;高雪垒
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作者：
黄晨;蔡宁;高雪垒
确定了大空间低侧墙送风系统的热分层水平。以2008年夏季的低侧送风试验为基础，采用数值模拟方法研究了低侧送风对室内热分层的影响。在模拟实验条件的基础上，模拟了不同送风速度下大空间内的风速和垂直温度分布，得到了热分层水平线。模拟结果与实验结果吻合较好，平均相对误差为3.4%。采用低侧墙送风方式，提高送风速度可以提高热分层程度。结果表明，在实验条件下，当出风风速为0.29 m/s时，高占区热环境均匀，层结水平稳定;当出风速度较低时，如0.05 m/s，热分层水平太低，气流速度太小，不能满足人体热舒适性。因此，当占地高度为2 m时，出风速度设计为0.31m/s较为合理。
The thermal stratification level of low sidewall air supply system in large space was defined. Depending on the experiment of low sidewall air supply in summer 2008,the thermal stratification level was studied by simulation. Based on the simulation of experiment condition,the air velocity and vertical temperature distribution in a large space were simulated at different air-outlet velocities,and then the thermal stratification level line was obtained. The simulation results well match with the experimental ones and the average relative error is 3.4%. The thermal stratification level is heightened by increasing the air-outlet velocity with low sidewall air supply mode. It is concluded that when air-outlet velocity is 0.29 m/s,which is the experimental case,a uniform thermal environment in the higher occupied zone and a stable stratification level are formed. When the air-outlet velocity is low,such as 0.05 m/s,the thermal stratification level is too low and the air velocity is too small to meet the human thermal comfort in the occupied zone. So,it would be reasonable that the air-outlet velocity may be designed as 0.31 m/s if the height of the occupied zone is 2 m.