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New air system design selection detailed tutorial

Blog | 2022/10/8 10:11:06

The occurrence of diseases such as haze, influenza and tuberculosis has caused China to pay great attention to indoor air quality. Central fresh air system is an inevitable choice for the development of building technology, building energy saving can not be separated from the new air system, people's health can not be separated from the new air system. As more and more families choose to install centralized fresh air system, centralized fresh air has long become a household name in existence.


Three design principles

1、Ventilation path

Define the path of ventilation: fresh air from outdoors enters the room from bedrooms, living rooms, etc., and is then discharged from bathrooms, dining rooms, etc., where dirty air is easily generated.


2、Ventilation air volume

Determine the minimum amount of fresh air in the housing - to meet the amount of fresh air people need for their daily life indoors.


3、Ventilation time

Ensure the continuity of ventilation - 24 hours a day, 365 days a year according to the first and second principles of continuous ventilation.


Calculation method

A number of air changes method.


G - total air volume

S---Set use area

H --- height of the dwelling

n---the number of air changes

Ve --- effective volume

(Indoor use volume excluding fixed furniture, storage rooms, etc. is generally 80%-100%)


Table: Minimum number of air changes in residential building design

B. Minimum fresh air volume:


  G - total air volume

  V - the minimum fresh air volume required per person (check table 3.0.6-1)

  n - the number of people in the residence


           Minimum fresh air volume required per person in main rooms of public buildings [m³/(h-people)

Area corresponds to the machine

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Fresh air design principles

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1 The numerator of the listed values is the recommended flow rate, and the denominator is the maximum flow rate.

2 For systems with anechoic requirements, the flow rate in the duct should be in accordance with the provisions of 10.1.5 of this specification.

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Air outlet selection



          Green is the recommended value for branch pipes, yellow is the recommended value for supervisors, and red is the alert value.