How to convert wind speed and air volume

Wind speed and air volume conversion formula? : l = 3600 * f * v(f- tuyere ventilation area M2V- measured tuyere average wind speed (m/s))

Brief description of wind speed

Wind has both magnitude and direction, so the wind forecast includes wind speed and direction. The magnitude of wind speed is usually expressed by wind grade. The level of wind is determined according to the degree of influence of wind on ground objects. Meteorology is generally divided into seventeen grades according to the magnitude of wind.

In the weather forecast, we often hear the expression "the north wind is 4 to 5", in which the wind refers to the average wind; If you hear the phrase "gust 7", gust refers to the wind with large and small speed, and the wind at this time refers to a wide range of winds. In fact, in nature, the wind sometimes exceeds 12. For example, the central wind force of a strong typhoon or tornado may be much larger than the magnitude of 12, but the wind above the magnitude of 12 is rare, so the magnitude is generally not specified.

Second, a brief description of the air volume

1, and air volume refers to the product of wind speed v and cross-sectional area f of air duct. Because the large fan can accurately measure the wind speed with the anemometer, the calculation of the air volume is also very simple, and the air volume can be calculated directly with the formula Q=VF. Where q is the single machine capacity of the selected fan model; V is the site volume; F is the cross-sectional area of the air duct.

2. Air volume is the most important index to measure the heat dissipation capacity of air-cooled radiator. Obviously, the greater the air volume, the higher the heat dissipation capacity of the radiator. This is because the heat capacity of air is fixed, and the larger the air volume, the more heat is taken away from the air per unit time. Of course, the heat dissipation effect is related to the airflow mode under the same air volume.

However, in practical application, the nominal maximum wind value is not the air supply volume obtained by the actual heat sink, and large air volume does not mean strong ventilation capacity. When air flows, the air flow will be blocked by the fins in its flow path, and its impedance will limit the free circulation of air. That is, as the air volume increases, the wind pressure will decrease. Therefore, there must be an optimal operating point, that is, the intersection of fan performance curve and wind resistance curve. At this operating point, the slope of the fan characteristic curve is the smallest and the change rate of the system characteristic curve is the lowest.

3. When the plane speed is constant, the larger the outer diameter of the blade impeller, the larger the ventilation area and the greater the air volume. The greater the air volume, the greater the heat absorption of cold air, and the more energy can be absorbed when the air flow is transmitted.

The more heat is taken away, the more obvious the cooling effect is.

Third, the unit of wind speed

The common unit of wind speed is m/s, 1m/s = 3.6?

Kilometers per hour.

Fourth, the unit of air volume

If the air volume is calculated in cubic feet, the unit is CFM；; ; If calculated in cubic meters, it is CMM, and the common air volume unit of radiator products is CFM.

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