When purchasing a ventilation system, many people blindly pursue the volume of the ventilation system, thinking that the bigger the better. Is it true that the bigger the fresh air volume of the fresh air blower, the better? Not so. Many people think that the air volume of the ventilation system is the fresh air volume, and "air volume" is just an abbreviation. In fact, the air volume of the ventilation system is not necessarily equal to the fresh air volume.

In addition to representing the fresh air volume, the air volume of the ventilation system may also represent:

1. Fresh air volume + return air volume;

2. Fresh air volume + exhaust air volume;

3. No-load air volume without filter.

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How to calculate the amount of fresh air required indoors

There are two ways to calculate the ventilation volume of a house. Calculating the maximum of these two values based on the "space area" and "number of users" will have a better effect on fresh air.

A Calculated according to the use area

The amount of fresh air is calculated based on the space area of the room and the number of air changes. According to the "Fresh Air Change Frequency Reference Table", the number of air changes for household fresh air is generally 0.7-1.0 times per hour, and is calculated based on the room space area.

Q1=volume*number of times=area*layer height*number of times.

B Calculated based on permanent population

The calculation of fresh air by area is based on the number of indoor residents. According to the standards in "Fresh Air Volume in Different Types of Buildings with Air-conditioned Environments", the fresh air volume required per person per hour is 30 cubic meters/h. Based on the number of permanent residents in the home, Can calculate the entire fresh air volume.Q2=30 (single person needs fresh air)*n (number of people).

There are certain differences in the calculation results based on the two methods. For the same house type structure, we will adopt the larger value of fresh air volume as the standard for fresh air design.

Usually the air volume is not only affected by the rated air volume, but also by the length of the pipe and the smoothness of the inner wall of the pipe. The air volume of the fresh air fan will suffer a certain loss during the transmission through the pipeline, which requires our fresh air fan to have a strong static pressure value, and the static pressure loss of each meter of pipeline reaches 3-5Pa.

Therefore, when purchasing a ventilation system, everyone must ask clearly what the fresh air volume is, and when choosing the fresh air volume of the ventilation system, choose a suitable fresh air volume.

If the fresh air volume is too small, it cannot achieve the purpose of indoor fresh air filtration and purification. If the fresh air volume is too large, it will lead to increased noise levels, limited installation locations, and increased investment costs. However, the fresh air effect will be better. It is still recommended to choose the fresh air volume that suits your apartment type.