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The air volume hood is used to collect the air volume of the chamber

日期:2022-09-25 07:20
浏览次数:245
摘要:The air volume hood is mainly composed of three parts: the air volume hood body, base and PDA. Mainly used for collecting chamber air volume. Applicable Scope: 1. The airflow at the air outlet in the central air conditioning system is relatively complex, which makes it difficult to measure. Only can not be measured at the branch pipe, only at the air outlet measurement, generally using tuyere air volume cover and tuyere wind speed method. 2. Compared with the tuyere wind speed met
The air volume hood is mainly composed of three parts: the air volume hood body, base and PDA. Mainly used for collecting chamber air volume.

Applicable Scope:

1. The airflow at the air outlet in the central air conditioning system is relatively complex, which makes it difficult to measure. Only can not be measured at the branch pipe, only at the air outlet measurement, generally using tuyere air volume cover and tuyere wind speed method.

2. Compared with the tuyere wind speed method, the air volume hood can quickly and accurately measure the average tuyere ventilation. No matter the inlet, outlet or outlet installed on the ceiling, wall or the ground, it is equipped with the corresponding sensor to directly read the wind speed, pressure and relative temperature and humidity, especially suitable for the diffuser tuyere. When used, the cover will be close to the ceiling face, so that the tuyere as a whole is completely contained, you can directly read.



Air volume hood structure





The following points should be paid attention to in the air volume measurement:

1. Cover size (tuyere size) Cap air volume A large difference between the cover and tuyere size will cause a large measurement error, so it is necessary to use a cover with similar tuyere size for measurement. According to the size and area of the tuyere to be measured, a volume hood close to the area of the tuyere should be selected, and the length of the air volume hood should not exceed three times of the length of the length of the tuyere; The area of the tuyere should not be less than 15% of the boundary area of the cover.

2. Check whether the air flow meter is normal and make all Settings of the air flow meter meet the requirements.

3. Determine the position of the cover to cover the tuyere, which should be located in the middle of the cover until the whole tuyere is covered by the wind cover.

4. Determine to ensure no air leakage at the tuyere, observe the display value of the air volume meter, and read the air volume value after the display value tends to be stable;

5. Back Pressure Compensation When the tuyere air volume is large, the resistance of the air volume hood and the throttling of the measured part to the tuyere will increase, causing the air volume to drop more. In order to eliminate the air volume of this part of the tuyere is small, the back pressure compensation is needed. When the air flow value ≤1500m3/h, there is no need for back pressure compensation, and the read air flow value is the air flow value of the measured tuyere; When the air volume value is >1500m3/h, the back pressure compensation baffle is used to compensate the back pressure. Reading the display value of the air meter is the measured air volume value after the compensation of the tuyere.

6. If the size of the tuyere is particularly large, you can propose the cover body of the customized air flow meter to us.



Air volume hood fitting bracket





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