高大空间建筑新型复合气流供暖系统可行性研究

Feasibility Study on a Novel Heating System Using Coupled Airflow in Large Space Buildings

高大空间供暖系统常采用分层空调,但浮力作用会导致送风热射流上浮严重,造成大量热量浪费且活动区舒适性差。提出一种在送风热射流上部附加控制气流的新型复合气流供暖方案,利用控制气流压制送风热射流以减弱其上浮。采用CFD数值模拟方法建立典型铁路客站候车厅喷口送风模型,对冬季供暖时有无控制气流作用下的室内空气流动和热环境进行模拟分析。结果表明该复合气流方案能有效减弱送风热射流上浮,使射流的垂直和水平射程分别增加40%和70%以上,并将活动区平均温度提高到18℃以上。

Stratified air-conditioning system is widely used for heating in large space buildings,but the supplied airflow largely floats due to the buoyancy effect,with a large amount of heat wasted and poor thermal comfort in the occupied zone.This paper proposes,a novel heating system using another airflow above the supplied airflow,which can suppress the heating jet and reduce the ascent of the jet.CFD numerical simulation is adopted to build the model of air jet system in the waiting hall of a typical railway station,and the indoor air flow pattern and the thermal environment when heating in winter with and without the extra jet are analyzed.Results show the airflow ascent is suppressed effectively using this novel heating system.Both the vertical flow range and the horizontal flow range are increased by above 40% and 70%.The average temperature in the occupied zone is increased to 18℃.