Output air volume of cooling fan of mining machine

1. Some mining machines can be equipped with water cooling, mainly to ensure that the operating environment ventilation, temperature is not higher than 40 degrees Celsius

2. Air volume refers to the total volume of air discharged or classified by the air-cooled radiator fan per minute. If it is calculated by cubic feet, the unit is CFM; If calculate by cubic metre, it is CMM. Cfm (about 0.028 m3 / min) is often used in radiator procts. The 50 x 50 x 10 mm CPU fan can reach 10 CFM, and the 60 x 60 x 25 mm CPU fan can reach 20-30 CFM. In the case of the same radiator material, the air volume is the most important index 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 the air is fixed, larger air volume, that is, more air can take more heat per unit time

of course, under the same air volume, the heat dissipation effect is related to the air flow mode. Air volume and air pressure air volume and air pressure are two relative concepts. Generally speaking, to design a fan with large air volume, it is necessary to sacrifice some air pressure. If the fan can drive a large amount of air flow, but the wind pressure is small, the wind will not blow to the bottom of the radiator (this is why some fans have high speed and large air volume, but the cooling effect is not good). On the contrary, if the wind pressure is large and the air volume is small, and there is not enough cold air to exchange heat with the heat sink, the heat dissipation effect will be poor. In general, the air pressure of the fan is required to be large enough for the aluminum fin, while the air volume of the fan is required to be large enough for the copper fin; The heat sink with dense fins needs a fan with higher air pressure than that with sparse fins, otherwise the air flow between the fins is not smooth and the heat dissipation effect will be greatly reced.

3.

The air volume of the radiator refers to the air flow generated by the radiator fan, not the number of fans

notebook radiator is a fan device that directly blows heat to the bottom of the notebook, forces the heat out of the notebook, and introces cold air to increase the air flow at the bottom of the notebook, so as to make all heating elements in the notebook get heat dissipation

the radiator can effectively maintain the internal low temperature working environment, which is a small device to effectively rece the temperature of notebook computer. However, notebook radiators usually only assist notebook cooling, and most of the radiators rece the external temperature of the notebook by strengthening the air flow speed of the plastic shell at the bottom, while the internal heat of the notebook mainly depends on the CPU fan to force convection, and the notebook radiator relay takes away the heat to complete cooling, Therefore, the pure external cooling effect can not reach our ideal state

features

1. every corner of radiator panel has fine chamfering treatment, which will not bring scratch to the book

2. reasonable slope setting makes the notebook more comfortable to use

3. it's natural to use laptops for a long time to cool down. Due to the increasing frequency of mainstream laptops, the temperature of long-term use is also getting higher and higher. In order to better protect their love & quot; Ben & quot; It does need to cool down. The cooling pad can help our notebook keep away from the pain of high temperature and ensure the normal operation of the notebook

4. blow the heat directly to the bottom of the notebook computer, force the heat out of the notebook computer, and introce cold air to increase the air flow at the bottom of the notebook computer, so as to make the heating elements in the notebook computer get heat dissipation, and effectively maintain the internal low-temperature working environment

5. the USB power supply is designed to be directly connected to the USB interface of the notebook without the need to add the socket and other devices

6. the wind speed of the radiator of a single fan is not very high, but it definitely does not mean that the heat dissipation effect is bad, because it is a single super large fan. The fan speed is a constant value set by the manufacturer after testing, which can achieve the best balance between the fan life and heat dissipation effect. The effect of this radiator should be the result of a customer's long-term use

4. CFS：Cubic Feet Per Second，立方英呎/秒(ft3/s)
CFM：Cubic Feet Per Minute，立方英呎/分(ft3/min)
CMS：Cubic Meter Per Second，立方公尺/秒(m3/s)
CMM：Cubic Meter Per Minute，立方公尺/分(m3/min)
CMH：Cubic Meter Per Hour，立方公尺/时(m3/h)
L/s：Liter Per Second，公升/秒(L/s)
L/min：Liter Per Minute，公升/分(L/min)资料来源：www.qzfan.com

5. Your problem is that there is too much st on the radiator fins
or the fan can not rotate at the highest speed e to long running time and bearing wear

6.

There are two methods to measure the air volume and pressure of cooling fan, one is wind tunnel instrument, the other is double box method. But for ordinary users, there is no such device. Only according to the data provided by the manufacturer as a reference, ultimately depends on the cooling effect

air volume: air volume refers to the proct of fan ventilation area and plane velocity. The ventilation area is the exit area minus the projected area of the vortex tongue. Plane velocity is the velocity of air flow through the whole plane, and the unit is m3 / s. When the plane velocity is constant, the larger the impeller diameter is, the larger the ventilation area is, and the larger the air volume is. The plane speed is determined by the rotor speed and wind pressure. When the ventilation area is fixed, the larger the plane velocity is, the larger the air volume is. The larger the air volume is, the greater the heat absorption of the air is. When the air flows and transfers, more heat can be taken away around the belt, and the more obvious the thermal effect of the fan is

air pressure: in order to carry out normal ventilation, it is necessary to overcome the resistance in the ventilation stroke of the fan, and the fan must proce the pressure to overcome the air supply resistance. The measured pressure change value is called static pressure, that is, the differential pressure between the maximum static pressure and atmospheric pressure. It is the pressure of the gas acting parallel to the surface of the object, and the static pressure is measured through a hole perpendicular to the surface. Converting kinetic energy needed in gas flow into pressure form is called dynamic pressure

7. The key of fan selection lies in the large air volume, followed by the best sound light, does not affect the mood of the operator. The key factors of large air volume are caliber and power. Within the allowable range, the larger the diameter of the fan is, the larger the air volume is and the wider the action area is. Generally, the reserved position in the main engine box is 8cm × 8cm axial fan, if not installed in the standard position, there is no such restriction. As for the power directly related to the speed of the fan, it is an important standard to measure the air volume of the fan with the same caliber. Generally, the 8cm is sold in the computer market × The fan power of 8cm chassis is relatively small, which is about 12V and 0.14a, but it is easy to use, as long as the microcomputer power is plugged in, it can work. To get high-power fans, you need to do it yourself. In the electronic market, there are fans of various powers, but there is no special interface for computers. You need to do it yourself. You can buy some power supply for the interface. The two-way expansion line takes its four core interface. Generally, the yellow line means + 12V, the black line means 0V, and the red line means + 5V. We use the yellow and black lines to power the fans, In addition, in the electronic market, there are a lot of second-class mobile phone axial fans to buy. These are rare and good things. Most of them are removed from imported instrial equipment. Many fans are made in Europe, America and Japan. When they are used, the noise is particularly low, and the power is generally large, with 8cm × Most of the 8cm fans are about 12V and 0.35A. Some of the aluminum alloy shell is the best, after power on feel the size of the air volume to know. You can also find 9cm × 9cm
and 12cm × 12cm large diameter fan.

8. The reason may be that the inclination angle of the blade is large
it can't be ruled out that if the air volume is larger, it's actually not big

when the ambient temperature is low, the air volume parameter is important for heat dissipation
when the ambient temperature is high, the speed (corresponding to wind speed) is important for heat dissipation.

9. It's very difficult, because we have to consider whether there are heat pipes, the number of heat pipes, the shape of heat pipes (the heat dissipation efficiency will decrease with each bending), the material of heat sink, the structure of heat sink, the working mode of heat sink, the ambient temperature and so on
generally speaking, the larger the fan is, the faster the speed is, and the larger the radiator is, the better the heat dissipation effect is. If there are specific examples, I can give you some suggestions