How to measure the airflow in air-conditioning ducts
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Experts, how can the air flow rate in an air conditioning duct be measured? The air duct is square. I used a Siemens anemometer before, but now I want to switch to measuring air volume directly. I would appreciate your advice
Bar-type instruments should work, I remember that the coal feeding air for boilers uses square-shaped ducts; it seems that Delta Bar is used in such cases.
Thermal gas mass flow meters can be insert-type. The diameter of a square pipe can be calculated based on the width and height of the square tube. You can contact me for details.
Plug-in bar-type instruments are the best. Aoniuba, Delta Ba, Weili Ba, Weiti Ba, etc
Search for duct anemometers on Taobao; there are insert-type ones, with imported models costing over 1,000 yuan and domestic ones costing around 500–600 yuan.
Can that cheap stuff work? At most, one can observe the trend of changes. Moreover, the diameter of air ducts is usually not small, and valves are also not cheap
This is an insert-type thermal flow meter that does not require a large pipe diameter; in fact, the larger the diameter, the better. Its accuracy is somewhat low, around 0.2 meters per second, but it is sufficient for use in the HVAC industry. At first, we used the e+e brand imported from Austria; it worked for over a year before breaking down. Later, there were domestic replicas available for around 600 yuan, and after using a few of those, I found that their quality was pretty much the same as that of the imported version.