Who determines the airflow and air pressure of a fan?
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When a fan operates at a constant power level, which one determines the other – airflow volume or air pressure – and how does it change? Which parameter is controllable? Is the air volume determined by the rotational speed?
The wind pressure and its components of a fan are related to each other; they influence one another, with changes in one leading to changes in the other. Both airflow volume and wind pressure are determined by the rotation speed.
Wind pressure is the difference between the air pressure at the inlet and outlet, while the air intake volume depends to a certain extent on wind pressure; the two influence each other·
The accurate statement is that the two influence each other: a higher air flow rate results in a lower wind pressure, while a lower air flow rate leads to a higher wind pressure
Air volume and air pressure are interrelated; air pressure has a significant impact on air volume. When air pressure is too high, the air volume decreases significantly, while when air pressure is too low, the air volume increases significantly as well.
The relationship between airflow rate and pressure can be roughly divided into three types: (1) flat type, (2) steep type, and (3) hump type. Fans with a flat Q-H curve are able to maintain a basically constant head even when the flow rate changes significantly. For fans with a steep curve, the head changes considerably as the flow rate varies. In the case of fans with a hump curve, as the flow rate increases from zero, the head rises at first, reaches its maximum value, and then starts to decline. Therefore, to determine the relationship between air volume and elegance, it is necessary to ask the manufacturer more questions or consult the instructions. It cannot be simply said to be an inverse relationship. References:
Our company also has several large fans; it has been found that some of them can achieve the required air volume while others cannot. The air delivered by the fans passes through filters, so it seems necessary to check the air pressure.