Cooling fan purchase parameters.neck fan rechargeable

　　The cooling fan is very important to our life. We often use a variety of cooling fans in our lives. Therefore, the purchase of cooling fans has become a very particular issue. So what parameters should you pay attention to when purchasing a cooling fan? Let's follow the cooling fan brand to understand the main parameters of the cooling fan.

　　Air volume

　　Air volume refers to the total volume of air discharged or incorporated by the cooling fan per minute. If it is calculated in cubic feet, the air volume unit is CFM; if it is calculated in cubic meters, it is CMM. The air volume unit often used by cooling fans is CFM (about 0.028 cubic meters per minute).

　　The air volume is the most important indicator to measure the cooling capacity of the cooling fan. Obviously, the larger the air volume, the higher the cooling capacity of the cooling fan. This is because the heat capacity ratio of the air is constant, and a larger air volume, that is, more air per unit time, can take away more heat. Of course, in the case of the same air volume, the heat dissipation effect is related to the flow of the wind.

　　wind pressure

　　Air pressure and air volume are two relative concepts. Generally speaking, under the consideration of cost saving by manufacturers, to design a fan with a large air volume, it is necessary to sacrifice some air pressure. If the fan can drive a lot of air flow, but the wind pressure is small, the wind cannot blow to the bottom of the radiator (this is why some fans rotate at high speed and the air volume is large, but the heat dissipation effect is not good), on the contrary, High wind pressure often means that the air volume is small, and there is not enough cold air to exchange heat with the heat sink, which will also cause poor heat dissipation.

　　speed of the fan

　　Fan speed refers to the number of times the fan blades rotate per minute, and the unit is rpm. The fan speed is determined by the number of turns of the coil in the motor, the working voltage, the number of fan blades, the inclination angle, the height, the diameter and the bearing system. There is no necessary connection between speed and fan quality. The rotational speed of the fan can be measured by the internal rotational speed signal, or it can be measured externally.

　　With the change of application conditions and ambient temperature, different speed fans are sometimes required to meet the needs. Some manufacturers have specially designed cooling fans with adjustable fan speed, which are divided into manual and automatic. The main purpose of manual is to allow users to use low speed in winter to obtain low noise, and use high speed in summer to obtain good cooling effect. The automatic thermostat radiator generally has a temperature control sensor, which can automatically control the speed of the fan according to the current working temperature. If the temperature is high, the speed will be increased, and if the temperature is low, the speed will be reduced to achieve a dynamic balance and reduce wind noise. Maintain an optimal combination with the heat dissipation effect.

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