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Air flow capture hood is used to collect air volume in the chamber

日期:2021-06-12 21:56
浏览次数:113
摘要:The air volume cover is mainly composed of three parts: the air volume cover body, the base and the PDA. It is mainly used to collect air volume in the chamber. Applicable Scope: 1. The air flow at the air outlet in the central air conditioning system is relatively complex, and the measurement work is relatively difficult. Only if it can not be measured at the branch pipe, it is measured at the air outlet. Generally, the method of air volume cover and wind speed of the wind outlet is a
The air volume cover is mainly composed of three parts: the air volume cover body, the base and the PDA. It is mainly used to collect air volume in the chamber.

Applicable Scope:

1. The air flow at the air outlet in the central air conditioning system is relatively complex, and the measurement work is relatively difficult. Only if it can not be measured at the branch pipe, it is measured at the air outlet. Generally, the method of air volume cover and wind speed of the wind outlet is adopted.

2. Relative to the wind velocity method of the tuyere, the air volume cover can quickly and accurately measure the average ventilation volume of the tuyere. Whether it is installed on the ceiling, wall or the ground, the air supply, return and exhaust tuyere, equipped with the corresponding sensor can directly read the wind speed, pressure and relative temperature and humidity, especially suitable for the diffuser type tuyere. When used, the cover mouth is close to the ceiling surface, so that the tuyere is completely inclusive, which can be read directly.



Air volume cover composition structure





What should be paid attention to in the air volume measurement of the air volume cover?

1, the size of the cover body (tuyere size) the air volume of the cap cover body and tuyere size difference will cause a large measurement error, so it is necessary to use the tuyere size similar to the cover body for measurement. According to the size and area of the tuyere to be tested, the air volume cover body which is close to the area of the tuyere should be selected, and the long side length of the air volume cover body should not exceed 3 times of the long side length of the tuyere; The area of tuyere should not be less than 15% of the boundary area of the cover body.

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

3, determine the placement position of the cover body to cover the tuyere, the tuyere should be located in the middle of the cover body, until the whole tuyere is covered by the wind hood.

4. Make sure that there is no air leakage in 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;

When the air volume of the tuyere is large, the resistance of the throttle of the air volume cover body and the measuring part to the tuyere will increase and cause the air volume to decrease more. In order to eliminate the air volume of this part of the tuyere is less, the back pressure compensation is needed. When the air volume value is less than or equal to 1500m3/h, there is no need for back pressure compensation, and the read air volume value is the air volume 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. The measured air volume after compensation is obtained by reading the display value of the air meter.

6. If the size of the tuyere is particularly large, we can put forward the cover body of the customized air meter.



Fittings support for air cover





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