Ventilation Purification Effect Of Indoor Formaldehyde Pollution

Sick Building Syndrome is a series of nonspecific symptoms including body fatigue,dizziness,headache,breathing disorders and memory loss of person living indoors for a long time.Mostly,SBS is result of the accumulation of gaseous pollutants such as formaldehyde long-term released by indoor decoration materials.Since the1970 s,Indoor Air Quality has become an important target in the field of green building.At present,the purification research of indoor gaseous pollutants is limited to the model with single room and simple layout.And the research of complex model taking into account furniture arrangement and wind field environment is less.Firstly,the paper introduced the indoor formaldehyde pollution of overweight status,influence factors and releasing mechanism and established the formaldehyde emission model of woodiness floor.Then using method of Computational Fluid Dynamics and considering Shaoguan dominant wind direction in summer,paper made a numerical simulation about formaldehyde concentration distribution under airtight and ventilation working conditions at different floors of the complex model by Fluent software.Then we obtained indoor airflow field and formaldehyde pollution concentration under different ventilation conditions.And paper analyzed the ventilation purification effect of indoor formaldehyde pollution in varies floors detailedly.Lastly,paper indicated the blind area of ventilation purification of formaldehyde pollution at each room,which room is the poor purification ability of formaldehyde pollution under natural ventilation and becomes the simulation object under forced ventilation.Then the paper provides guidance efficiently for controlling indoor formaldehyde pollution and improving indoor air quality at the ventilation condition.Based on the south wind that is predominant wind direction in summer,the paper?s main conclusions are as follows:(1)The community oblique direction layout promotes the formation of tunnel effect between the buildings,causing uncomfortable feeling of the wind;(2)Groove shape of building A causes surface dust and particle pollutants raising and gathering,which reduces the outdoor environmental quality;(3)The ventilation purification efficiency of indoor formaldehyde pollution is bestat the mezzanine position of building A,poor at the top location and worst at the underlying location.And the master bedroom and second lie A is poor purification efficiency of indoor formaldehyde pollution under the South-wind action,which areas need forced ventilation purification.(4)The formaldehyde concentration level of single room under forced ventilation purification is far lower than the permissible value in standard.But the inlet velocity is unfavorable to use high wind speed.And the appropriate velocity is about 1m/s.Then the paper suggests that we can use floor fan to purify indoor formaldehyde pollution of adult bedroom and use desk fan to purify indoor formaldehyde pollution of infants and young children bedroom.