地板送风系统中无量纲数对室内CO2浓度的影响

本文对地板送风系统进行数值模拟,通过分析室内温度场、速度场以及不同工况下CO2浓度随空间高度的变化,结果表明不同工况下的CO2排除效率有所不同,通过比较热长度尺度Lm/H和阿基米德数Ar与CO2排除效率的关系曲线,指出热长度尺度Lm/H与阿基米德数Ar都与分层高度有关,当阿基米德数Ar越小,CO2的排除效率变化越明显,当阿基米德数Ar很大的时候,CO2的排除效率几乎不变;而热长度尺度Lm/H不论变大还是变小,其CO2的排除效率都变化很明显。

The Influence of Nondimensional Parameter to the Concentrations of Carbon Dioxide in the Underfloor Air Distribution System

Numerical simulations were performed on a chamber with underfloor air distribution system.Based on observing the temperature field,velocity field and concentrations of carbon dioxide in different conditions,the results show that the exclusive efficiency of carbon dioxide in different conditions is different.It indicates that the thermal length scale of the supply jet and Archimedes number have some connection with exclusive efficiency of carbon dioxide by comparing the relationship between the thermal length scale of the supply jet and Archimedes number with the exclusive efficiency of carbon dioxide.When the thermal length scale of the supply jet is getting smaller,the exclusive efficiency of carbon dioxide changes a lot.However,when the thermal length scale of the supply jet is getting bigger,the exclusive efficiency of carbon dioxide hardly changes.While whether Archimedes number is getting smaller or getting bigger,the exclusive efficiency of carbon dioxide changes a lot.