Fan exhaust volume of ant mining machine

1. Bubble milk powder generally choose tap water at home to boil and cool, do not choose mineral water, which contains some substances not suitable for the baby.

3. How to cool without fan

4. 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.

5.

The exhaust volume L is calculated as follows: l = L1+ ν· F· β Where L1 -- the amount of polluted gas in the cabinet, / S

to confirm this orientation, we need to pay attention to the use environment, and see which part is the most suitable, so that the exhaust fan can achieve the best use effect

When installing, pay attention to whether each fastener is installed tightly to ensure the normal and safe operation of the exhaust fan. The installation of exhaust fan should pay special attention to the smooth installation

ν—— Control wind speed at working orifice

F -- total area of working orifice and gap

β—— safety system, β= 1.1～1.2

extended data:

the use environment of exhaust fan is generally used for some occasions requiring low noise and high static pressure to achieve an air circulation effect. Different exhaust fans have different voltage and size specifications. Users can choose different types of exhaust fans according to their different needs. Before installing the exhaust fan, it is necessary to determine an installation orientation

to put the exhaust fan in a stable horizontal position, it is also necessary to install the exhaust fan in a convenient position for daily use. Generally speaking, when installing the exhaust fan, it needs a bracket, and the fixation of this bracket also needs certain skills and precautions

6. The formula for calculating the fan exhaust air volume is as follows:
the calculation principle of the exhaust air volume is to ensure that the exhaust air volume meets the requirements of the orifice suction wind speed and the control wind speed. The exhaust volume L is calculated as follows: l = L1+ ν· F· β
where L1 is the amount of polluted gas in the cabinet, / S< br /> ν—— Control wind speed at working orifice
F -- total area of working orifice and gap< br /> β—— safety system, β= 1.1～1.2<

calculate the fan air volume required by CPU
1. Electrical heat (H) = thermal power (P) * second (T) / 4.2 unit joules
2. Fan heat dissipation (H) = specific heat (c) * mass (M) * temperature difference (△ T)
3. Mass (m) = air volume (CFM) * density ρ)* Time (T)
can be calculated:
air volume q = 1.76p / △ t -------- CFM
air volume q = 0.05p / △ t -------- CMM
so theoretically, if the CPU with tpd65w thermal power has 28 ℃ room temperature and 38 ℃ exhaust air temperature, it needs 11.44cfm fan. If the temperature difference is 2 degrees, a 57.2cfm fan is required
how to calculate the working temperature of CPU
1. Chip temperature (T) = air temperature (T1) + chip thermal power (P) * thermal resistance (R)
2. Thermal resistance (R) = chip thermal resistance (R1) + thermal conctive material thermal resistance (R2) + radiator thermal resistance (R3)
3. R2 = thermal impedance (z) / [heat transfer surface proct (a) * bonding area ratio%]

7. Air volume refers to the total volume of air delivered or inhaled by the air-cooled radiator fan per minute. If it is calculated in cubic feet, the unit is CFM; If it is calculated by cubic meter, it is CMM. The unit of air volume often used in radiator procts is CFM
calculation formula: n = v × N / Q
1. N - number of fans (set); V - site volume (M3); N -- ventilation times (times / hour); Q -- single air volume of selected fan model (m3 / h)
2. Air volume refers to the total volume of air delivered or inhaled by the air-cooled radiator fan per minute. If it is calculated in cubic feet, the unit is CFM; If it is calculated by cubic meter, it is CMM. The unit of air volume often used in radiator procts is CFM.

8. Fan with differential disk, 2,3 ten, or awesome.

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