Now, although people's quality of life has improved, the problem of environmental pollution has become more and more serious, which has greatly affected our health. In order to improve the indoor air quality, many people have equipped their homes with fresh air systems. So, how to calculate the air volume of the fresh air system?

The simplest principle of fresh air system is to discharge indoor turbid air and suck in outdoor fresh air in a closed environment without windows, so as to keep fresh air in the room all the time and maintain moderate air flow, thus isolating outdoor noise, germs, dust and mosquitoes. The fresh air system can exhaust the harmful gases in the room to the outside, change the fresh air into the room at the same time, and filter the dust at the same time to prevent the outdoor sundries from entering the room.

area of a computer room: S=65(㎡), clear height h=3 (m), and personnel n=25 (persons);

required fresh air volume per person: [take the required fresh air volume per person q=31(m3/h)];

total fresh air volume: Q1=n? q=25? 31=751(m3/h);

calculation of room fresh air ventilation times: [take room fresh air ventilation times dial p=4 (times /h)], then the fresh air volume Q2=p.s.h=4? 65? 3=781(m3/h);

note: calculation formula of room volume: volume = length? Wide? The number of fresh air heat exchangers or the number of air supply and exhaust machines should be selected at the height below the air supply outlet = room volume? Number of air changes required.

exhaust air volume = room volume? Ventilation times;

air supply volume = room volume? Air supply and ventilation times;

negative pressure should be maintained in some places, such as toilets and kitchens. Where the positive pressure is maintained, it is best to calculate that the indoor pressure is much, so as not to open the door if the design is too big. The minimum fresh air volume in the room is Lw=nRp+Rb*Ab.

Rp- minimum fresh air per person, m3/(h? People), Rb- minimum fresh air required per square meter of floor, m3/(h? m2); Ab- floor area, m2.

as we all know, a house will produce a lot of toxic gases after renovation, which will threaten our health and cause diseases if it is not ventilated. Therefore, it is very necessary to install fresh air system, so as to improve the indoor air quality and let us breathe fresh and healthy air.