The fresh air system forms indoor and outdoor air circulation through mechanical forced ventilation, uses air supply and exhaust systems to build a "fresh air flow field", and combines filtering, temperature control and other functions to achieve air replacement.
Core working principle
Forced ventilation forms a flow field
The system forces purified outdoor air into one side of the closed room through a high-pressure fan, and exhausts dirty air on the other side through exhaust equipment, forming a directional "fresh air flow field".
Airflow organization methods include:
Positive pressure air supply: Directly supply air to the room, but the convection is weak.
Negative pressure ventilation: The exhaust fan sucks air to form a low-pressure area, which promotes the natural inflow of outdoor air and makes the airflow more stable.
Air treatment process
Triple purification: Outdoor air passes through the primary filter, IFD micro-electrostatic filter, and HEPA high-efficiency filter to remove pollutants such as particulate matter and bacteria.
Additional functions: Some systems have preheating (in winter), oxygenation, sterilization and other functions to improve air supply quality.
Heat recovery and temperature control (advanced system)
The two-way heat recovery system recovers heat/cold from the exhaust air through a full heat exchanger to reduce energy loss.
The temperature control system maintains a stable supply air temperature through the linkage of sensors and electric regulating valves (such as PI control in the fresh air unit).
Technical implementation details
Power source: A large-flow DC brushless motor is used to drive the fan to ensure efficient and low-noise operation.
Pipeline design: It must be horizontal and vertical, and environmentally friendly materials must be used to avoid secondary pollution.
Maintenance requirements: Clean the filter and air outlet regularly to prevent dust accumulation from affecting performance.
Summary: The fresh air system uses mechanical ventilation and multiple purification technologies to achieve indoor and outdoor air replacement, while taking into account energy efficiency and comfort. It is a key solution for improving air quality in modern buildings.