Office Chair Ventilation Principle
The ventilation principles of office chairs vary depending on their design, primarily falling into two types: 'air-injection' and 'air-suction'.
'Air-Injection' Ventilation Principle
This is a more common design, with its core being the injection of air into the seat interior through built-in fans. The fans are typically installed at the bottom or back of the seat. When activated, they draw external air into the air cavity structure inside the seat. The air cavity is connected to numerous small holes on the seat surface via pipes, and the air forms a uniform airflow at these holes and flows outward. When a user sits on the chair, the airflow directly acts on the contact area between the human body and the seat surface, carrying away body heat and moisture through continuous flow, creating a local air circulation. The advantages of this design lie in its simple structure and relatively low cost. However, attention should be paid to the impact of fan noise and airflow uniformity on the user experience.
'Air-Suction' Ventilation Principle
The 'air-suction cushion fresh air system', represented by the Qingxian OC1 Pro, adopts a reverse airflow design. Its core is to actively draw air from the contact area between the cushion and the human body through a negative pressure device. When a user sits down, the cushion surface undergoes slight deformation due to pressure, forming a sealed area that fits closely with the human body. The built-in air extraction device is connected via pipes to the air inlets at the bottom or sides of the cushion, continuously drawing the hot air and moisture from this area into the system interior. After passing through the internal heat dissipation module or filter, the airflow is discharged out of the chair through the air outlets on the backrest or sides. The advantages of this design include its ability to precisely locate the source of stuffiness and accelerate heat dissipation through forced convection, while avoiding the discomfort caused by direct airflow blowing on the human body. However, the system complexity and cost are relatively high.
Common Goal of the Two Designs
Whether it is the 'air-injection' or 'air-suction' design, their essence is to enhance the airflow in the contact area between the seat and the human body, disrupting the conditions for the formation of a hot and humid environment. Scientific research has shown that when the air velocity in the contact area between the body surface and the seat surface reaches 0.2-0.5 m/s, it can significantly lower the skin temperature by 1-3ยฐC and reduce the sticky feeling caused by sweat accumulation. Some high-end products also incorporate phase change materials or gel layers to further enhance the cooling effect through physical heat absorption.
