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Explanation of air volume, air pressure and PQ curve of cooling fan

by:TOCH     2021-04-01

Automobile radiator fan factory is a cooling fan manufacturer integrating Ru0026D, production and sales. We have worked hard in the cooling fan industry for the rest of our lives. Brand Fan Yimeng is a first-line brand in China. The following car radiator fan factory will briefly explain the relevant knowledge of the air volume, air pressure and PQ curve of the cooling fan. The air volume of the cooling fan refers to the total volume of air sent or sucked in by the fan per minute. The air volume unit often used in fan products is CFM, which is Cubic Feet per Minute. When the material is the same and the heat dissipation principle is the same, the air volume is the most important indicator to measure the heat dissipation capacity. Simply put, the larger the air volume, the higher the heat dissipation capacity of the fan. This is because the heat capacity of the air is constant, and the greater the air volume, that is, the more air per unit time can take away more heat. The air pressure of a cooling fan is also called static pressure, which refers to the difference in air pressure between the air inlet and the air outlet of the fan. The unit is usually millimeter water column height (mmHO) or inch water column height (inchHO). For the air pressure and air volume specification and characteristic test of the cooling fan, it is mainly carried out in accordance with the 'Laboratory Method of Testing Fans for Rating' test specification numbered by the American Air Movement and Control Association (AMCA). The characteristic curve obtained by the measurement is generally called the PQ curve. (As shown in the figure below) PQ curve is usually described by a physical value: () Pmax: When the air volume is, the maximum static pressure value of the fan in the state of a fixed volume in a confined space. () Qmax: The flow when the pressure difference between the inlet and outlet of the fan is, which is the maximum flow of the fan. () PQ value: the corresponding value of the pressure difference between the inlet and outlet of the fan and the flow Q in the current state. Once the size of the cooling fan is determined, corresponding to each voltage or speed, under different air flow, measuring its pressure value, you can draw a PQ curve as shown in the figure above, and this curve can be used to describe the characteristics of the fan, so It is called the fan characteristic curve.
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