Abstract
In order to study the purification effect of clean fresh air on PM2.5 in bedroom, the concentration distribution of PM2.5 in bedroom was numerically simulated using RNG k-e turbulence model based on DPM discrete phase model. In the case of severe haze, clean fresh air is introduced to meet the needs of indoor personnel. Aiming at two common types of airflow in the bedroom (same side/opposite side upper and lower back) and two different air supply speeds, studied the purification effect of fresh air on PM2.5. The results showed that there was no significant difference in the decrease rate of PM2.5 in the respiratory surface under the two inlet velocities. In the first 600s, the concentration of PM2.5 decreased by 75% with the inlet and outlet were on the same side, while the PM2.5 concentration decreased by 63% with the inlet and outlet were on the opposite side. The PM2.5 concentration distribution was more uniform when the inlet and outlet were on the same side than the opposite side. It is concluded that the air supply position has a greater influence on the purification effect than the air inlet velocity when the fresh air volume is constant. When the inlet and outlet were on the same side the introduction of the clean fresh air in the bedroom is more effective in purifying the PM2.5 than the opposite side.
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