Effects of Internal Partitions on Flow Field and Air Contaminant Distribution under Different Ventilation Modes.

Xiaoping Liu,Xiaojiao Wu,Linjing Chen,Rui Zhou

doi:10.3390/ijerph15112603

Abstract

Based on frequently used internal partitions in offices, the effects of pollutant source characteristics and an internal partition on airflow and contaminant distribution under different ventilation modes are studied in this paper. The indoor flow field measurement is implemented in a 1:1 single environmental chamber under different ventilation patterns, and then the numerical model is established. The numerical method is verified and analyzed by comparing the measured and simulated results. According to the verification results, the numerical simulation is introduced to study the influence of different supply and return air mixes and pollutant source distributions on the flow field and diffusion performance with an internal partition. The indoor flow field and concentration distribution under different conditions are compared, and the discharge efficiency under different working conditions is analyzed. The results indicate that internal partitions have a greater influence on the down-supply up-return ventilation mode than the floor-supply up-return and top-supply down-return ventilation mode. Furthermore, if the room is zoned, the effect of source position is larger under the down-supply up-return ventilation mode than under the other two modes.

Highlights

In modern society, indoor air quality has become an important concern for public health due to the improper use of most building decoration materials and air-conditioning equipment
Indoor air flow patterns under different ventilation modes are the dominant factors of contaminant diffusion and distribution, and pollutant source characteristics play a key role in indoor contaminant distribution [4,5,6]
Li et al deduced an analytic equation of indoor contaminant distribution by optimizing the single-chamber air supply model and selecting the appropriate pollutant dispersion model and initial conditions, and validated the equation based on the experimental data [8]

Summary

Introduction

Indoor air quality has become an important concern for public health due to the improper use of most building decoration materials and air-conditioning equipment. Indoor air contaminants are closely related to people’s health: The contaminants will accumulate with poor ventilation, and the enclosed environment is more likely to deteriorate the indoor air quality [2,3]. Indoor air flow patterns under different ventilation modes are the dominant factors of contaminant diffusion and distribution, and pollutant source characteristics play a key role in indoor contaminant distribution [4,5,6]. Many experts and scholars have studied indoor ventilation and contaminant distribution characteristics in a single room. Li et al deduced an analytic equation of indoor contaminant distribution by optimizing the single-chamber air supply model and selecting the appropriate pollutant dispersion model and initial conditions, and validated the equation based on the experimental data [8]. Zhao et al studied the diffusion characteristics of particulate matter

Results

Discussion

Conclusion