Basic Research Of Indoor Air Stability Theory

This paper first summarizes IAQ assessment methods and notices that there are similarities or at least part of the similarities in the pollution transport property between indoor air and outdoor air ambient or atmosphere. We tries to introduce relevant new concepts from atmosphere for indoor pollution transport issues.We introduce relevant atmosphere concepts such as dry air adiabatic lapse rate and temperature lapse rate. We also introduce basic concepts of the atmospheric stability theory and its sorting processes. Then we have cited some relevant concepts like the indoor dry air adiabatic lapse rate and the indoor temperature lapse rate from atmospheric stability and further introduced them into indoor pollution assessment. We define that indoor air stability is the amount of the correlation between indoor turbulence flow climatic environment and the pollution transport property. We roughly categorize indoor air stability into following types: stable type,unstable type and neutral type.The paper adopts computational fluid dynamics (CFD) method to exhibit temperature distribution, indoor air vertical temperature lapse rate and contamination diffusion trend of our models, i.e. simulate pollution transport property of ammonia and catbon dioxide in three different indoor air stabilitis,case1～case3. Correlation analyses of stability strongly corroborate that under the two absolutely opposite circumstances, i.e., normal distribution with positive temperature lapse rate and inverse distribution with negative temperature lapse rate, pollutant transport property will differ apparently accordingly. If indoor air is unstable type, turbulence flow is intensified and reinforces the pollution diffuse while turbulence flow is restrained compared with unstable type when indoor air is stable.For indoor pollution transport property being restricted by a vatiety of factors due to its finite space, we point out that dimensional analysis and fuzzy mathematics methods can helpful to our future research.