基于场协同理论的供暖房间甲醛扩散模拟研究

Simulation of formaldehyde diffusion in floor heating room based on field synergy theory

自然通风可有效控制室内的甲醛污染,应用场协同理论分析速度场和温度场对甲醛扩散过程协同作用,可为优化通风排污和净化效果提供依据。文章采用计算流体动力学方法,对冬季地板供暖房间以自然通风方式稀释甲醛的过程进行数值模拟研究,对比分析了污染源位置不同,即衣柜位于通风口邻侧与对侧时,室内甲醛的浓度分布情况,并基于传热、传质的类比关系,应用传质场协同理论分析了甲醛稀释的对流传质过程。结果表明:地板供暖房间内的流场分布对房间的温度场及甲醛的浓度场影响较大;地板供暖房间甲醛的分布在竖直方向上有明显的分层现象,由于重力的抑制作用,随高度的增加,甲醛的含量逐渐降低;当污染源衣柜位于通风口邻侧时,各特殊截面的传质场协同角较小,对流传质效果更好,更有利于将引入的新风稀释甲醛,降低室内的甲醛含量。

The natural ventilation can effectively control formaldehyde pollution.The synergistic effect of velocity field and temperature field on formaldehyde diffusion process is analyzed by field synergy principle.It can provide basis for purification effect.The process of formaldehyde dilution by natural ventilation in floor heating rooms in winter is numerically simulated by Computational Fluid Dynamics method.The concentration distribution of indoor formaldehyde when the pollution source wardrobe is located on the adjacent side and opposite side of the ventilation vent is mainly compared and analyzed.Based on the analogy of heat and mass transfer,the convective mass transfer process of formaldehyde diluted was further analyzed by applying the principle of mass transfer field synergy.The results show that:the distribution of flow field in a floor heating room has a great influence on the temperature field and the concentration field of formaldehyde,and the concentration field of formaldehyde in the room is similar to that in the temperature field;the distribution of formaldehyde in the floor heating room has obvious stratification in the vertical direction.And the content of formaldehyde decreases gradually with the increase of height due to the inhibition of gravity in the vertical direction.When the pollution source wardrobe is located near the vent,the synergistic angle of mass transfer field of each special section is smaller,the effect of convective mass transfer is better,and the concentration of formaldehyde in the bedroom is lower.It will be more conducive to the dilution of formaldehyde by the fresh air introduced and the reduction of indoor formaldehyde content.