基于室内非均匀环境营造的新型通风模式下人员热舒适性及系统节能潜力

Personnel thermal comfort and system energy-saving potential of a new ventilation mode based on indoor non-uniform environment creation

为解决现有通风空调系统无法根据占用区域实现按需供冷造成的热不舒适及能源浪费问题,本研究根据人员占用区域需求实时切换气流模式组合及冷量供给,提出了一种新型通风模式,旨在利用多种气流模式的最优组合控制特定需求场景。采用数值模拟的方法探究了不同占用区域情况下新型通风模式的人员热舒适性和系统的节能潜力,并与混合通风模式和层式通风模式进行了对比。结果表明:新型通风模式在气流组织上具有明显优势;新型通风模式较混合通风模式和层式通风模式具有更高的热舒适性,空气分布特性指数最大;新型通风模式局部冷量利用系数最小,冷量有效利用率最高,所需供冷量最小,因此新型通风模式的节能潜力最大。

In order to solve the thermal discomfort and energy waste problems caused by the inability of existing ventilation and air conditioning systems to achieve on-demand cooling according to the occupied area,this study proposes a new type of ventilation mode,which switches the airflow pattern combinations and cooling supply in real time according to the demand of the occupied area of the personnel,aiming to control specific demand scenarios by using the optimal combination of multiple airflow modes.Numerical simulation methods are used to investigate the thermal comfort of the personnel and the energy-saving potential of the system for the new ventilation mode under the conditions of different occupied areas,and to compare them with those of mixing ventilation mode and stratum ventilation mode.The results show that the new ventilation mode has obvious advantages in air distribution,and better thermal comfort than mixing ventilation mode and stratum ventilation mode,with the largest air diffusion performance index.The new ventilation mode has the lowest coefficient of local cooling capacity utilization and the highest effective utilization rate of cooling capacity,so the cooling capacity required is the smallest and the energy-saving potential is the greatest.