Fresh air volume refers to the air volume that each person enters the room in unit time, and the unit is cubic meter per hour per person. There are three ways to get fresh air: natural ventilation, mechanical ventilation and central air conditioning ventilation.
There was a significant difference in the minimum fresh air volume needed by different populations. Adults needed ≥ 30 m? / (person). H) , middle school students need ≥ 32m? /. H) Junior high school students need ≥ 25m? /. H) , pupil ≥ 20 m? / (people. H), the minimum amount of fresh air required by people in different places is slightly different. For example, in indoor places with high air quality requirements or places with poor environment, people's requirements for fresh air volume will increase accordingly.
As we all know, "natural ventilation" is to open the doors and windows of buildings for ventilation.
There are three functions of natural ventilation: first, to supplement fresh air; second, to discharge indoor air pollutants; third, to inhibit the growth and propagation of indoor bacteria and molds.
Natural ventilation is one of the cheapest, fastest and most effective ways to improve indoor air quality. When the concentrations of indoor air pollutants, radioactive pollutants and biological pollutants are high, natural ventilation should be preferred to improve indoor air quality. For example, in the newly-built, rebuilt, expanded and newly decorated buildings, the concentration of VOCs in the air is often several times higher than that in the outdoor, so natural ventilation is the first choice to discharge VOCs to the outdoor area and improve the indoor air quality.
Another effect of natural ventilation is to reduce indoor relative humidity, especially in kitchens, bathrooms and toilets, and other indoor humidity, condensation or water damage and maintain good ventilation, quickly outside the indoor water, it can effectively destroy the environment where bacteria and mold are easy to grow in humidity, inhibit the growth of bacteria and mold, and influence the potential source of pollution control.
It should be noted that when heating in winter and cooling in summer, heating or cooling outdoor air to indoor temperature after ventilation will increase energy consumption. Therefore, the opening size of doors and windows should be determined according to the degree, frequency and time of indoor air pollution, so as to save energy.
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