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How can I set temperature, speed, and other values for my fan with PWM function?
CPUFAN Target Temp Value (the temperature at which the fan speed starts to be controlled) When the CPU temperature is below this target value, the fan will rotate at a relatively low speed. When the CPU temperature is above this temperature, the fan speed will increase to full speed at a set value. CPUFAN Tolerance Value (the rate at which the fan speed changes, the larger the value, the faster the change). CPUFAN StartUp Value (When the CPU temperature reaches the set temperature of Target Temp Value, the fan speed will start to increase at this value). CPUFAN Stop Value (the setting where the fan speed decreases to this value when it is below the target value). CPUFAN StopTime Value (the time it takes for the fan speed to change from the starting value to the final value). Additional information: The speed of a fan is closely related to its power, and the size of the speed directly affects the size of the fan power. We usually believe that within a certain range, the higher the speed of the fan, the greater the amount of air it delivers to the CPU, and the better the cooling effect obtained by the CPU. But once the speed of the fan exceeds its rated value, the fan will also generate heat when working under overload for a long time. The longer the time, the greater the heat generated. At this time, the fan not only cannot achieve good cooling effect, but also "adds fuel to the fire"; Besides. During high-speed operation, fans may produce strong noise, which may shorten their lifespan over time; Moreover, higher operating speeds require greater power to provide a "power source", which is obtained from the high power of the mother
2. Unit of air volume
The unit of air volume is cubic meters per minute. The air volume refers to the total volume of air sent out or sucked in 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, and the air volume unit commonly used in radiator products is CFM. The influencing factors of air volume: When the material of the heat sink is the same, air volume is the most important indicator to measure the heat dissipation capacity of an air-cooled radiator. Obviously, the larger the airflow, the higher the heat dissipation capacity of the radiator. This is because the heat capacity of air is constant, and a larger air volume means that more air can carry away more heat per unit time. Of course, the heat dissipation effect is related to the flow of wind under the same air volume. The difference in heat distribution is large, and the generated wind is large or small. The higher the heat, the lower the density, and the higher the density where the heat is relatively small, this is thermal expansion and contraction. Airflow will flow from areas with higher density to areas with lower density. If there is a large difference in density, the airflow will be larger, which means the wind will be stronger. The above content refers to: Baidu Baike - Airflow
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