CPU Cooling Fan Kit 2200RPM CPU Cooler

Fan
For air-cooled radiators, the forced convection of the fan ultimately accelerates the heat dissipation, so the quality of a fan plays a decisive role in the overall heat dissipation effect. Equipped with a high-performance CPU fan is also one of the key factors to ensure the smooth operation of the entire computer. There are many factors that determine the final heat dissipation performance of a fan, mainly including air volume, speed, noise, service life, and the type of fan blade bearing used.
1. Air volume
Air volume refers to the total volume of air discharged or incorporated by the air-cooled radiator fan per minute. If calculated in cubic feet, the unit is CFM; If calculated in cubic meters, it is CMM. The air volume unit commonly used in radiator products is CFM (approximately 0.028 cubic meters per minute). A 50x50x10mm CPU fan typically reaches 10 CFM, while a 60x60x25mm fan typically reaches 20-30 CFM. When the material of the heat sink is the same, the air volume is the most important indicator to measure the heat dissipation capacity of the air-cooled radiator. Obviously, the larger the air volume, the higher the heat dissipation capacity of the radiator. This is because the heat capacity ratio of air is fixed, and a larger air volume means that more air can carry more heat per unit time. Of course, under the same air volume, the heat dissipation effect is related to the flow mode of the wind.
Air volume and pressure
Air volume and air pressure are two relative concepts. Generally speaking, in order for manufacturers to save costs, designing fans with high air volume requires sacrificing some air pressure. If a fan can drive a large amount of air flow, but the wind pressure is small, the wind cannot blow to the bottom of the radiator (which is why some fans have high speed and large air volume, but it is the reason for poor heat dissipation). On the contrary, high air pressure often means that the air volume is small, and there is not enough cold air to exchange heat with the heat sink, which can also cause poor heat dissipation. Generally, aluminum fin fins require a fan with sufficient air pressure, while copper fin fins require a fan with sufficient air volume; Fins with denser fins require a fan with higher wind pressure compared to fins with thinner fins, otherwise the air flow between the fins is not smooth, and the heat dissipation effect will be greatly reduced. So, for different radiators, manufacturers will cooperate with fans with appropriate air volume and pressure as needed, rather than simply pursuing fans with high air volume or pressure.
Fan speed
Fan speed refers to the number of times the fan blades rotate per minute, in rpm. The fan speed is determined by the number of turns of the coil inside the motor, working voltage, number of fan blades, inclination angle, height, diameter, and bearing system. There is no inevitable connection between speed and fan quality. The speed of the fan can be measured through internal speed signals or external measurements (external measurements are made using other instruments to see how fast the fan is rotating, while internal measurements can be directly viewed in the BIOS or through software. Internal measurements have relatively larger errors). As the application situation and environmental temperature change, different speed fans are sometimes required to meet the demand. Some manufacturers have specially designed radiators with adjustable fan speeds, which can be divided into two types: dynamic and automatic. The main purpose of manual operation is to allow users to use low speed for low noise in winter and high speed for good heat dissipation in summer. Automatic temperature regulating radiators generally come with a temperature control sensor that can automatically control the fan speed based on the current operating temperature (such as the temperature of the heat sink). If the temperature is high, the fan speed will increase, while if the temperature is low, the fan speed will decrease to achieve a dynamic balance, thus maintaining an optimal combination of wind noise and heat dissipation effect.
2. Fan noise
In addition to the heat dissipation effect, the working noise of fans is also a common concern. Fan noise refers to the amount of noise generated during fan operation, which is influenced by various factors and is measured in decibels (dB). When measuring the noise of a fan, it is necessary to conduct the measurement in an anechoic chamber with a noise level of less than 17dB, one meter away from the fan, and align it with the air inlet of the fan along the direction of the fan shaft, using an A-weighted method for measurement. The spectral characteristics of fan noise are also important, so it is necessary to use a spectrograph to record the frequency distribution of fan noise. Generally, it is required that the fan noise should be as small as possible and there should be no abnormal noise. Fan noise is related to friction and air flow. The higher the fan speed and air volume, the greater the noise caused, and the vibration of the fan itself is also a factor that cannot be ignored. Of course, a high-quality fan will have minimal vibration, but the first two are difficult to overcome. To solve this problem, we can try using larger fans. The working noise of a large fan at lower speeds should be smaller than that of a small fan at higher speeds, with the same air volume. Another factor that we easily overlook is the bearing of the fan. Due to friction and collision between the shaft and bearings during high-speed rotation of the fan, it is also a major source of fan noise.

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