Which flow meter to choose for measuring air flow
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Pipe diameter: DN150, pressure: 10 KPA, temperature: room temperature, flow rate: 1500 N3/H, medium: air. Which flow meter is the best choice? Factors such as cost and accuracy need to be taken into consideration. Used: Vortex flow meter, thermal type, venturi tube. What type of flow meters do students generally use? Is temperature and pressure compensation still needed?
Vortex flow meters are sufficient; they are easy to install and use. Whether temperature and pressure compensation is needed depends on your requirements for accuracy
At first, when I saw the question, I thought it was about the selection of an instrument air flow meter. But then I noticed that the pressure was 10 KPa, which is a very low value; the pipe diameter was DN150, which is considered relatively large; and the flow rate was 1500 NM3/h. The flow velocity is 23.57 m/s. It actually falls within the range of low to moderate flow rates. Considering overall cost factors, it is recommended to use a float flow meter, a metal tube float flow meter (a tapered tube type is preferred), or a glass tube float flow meter. If higher control precision is required, thermal and pressure compensation can be added. If you think the float flow meter is slightly cheaper but not very accurate, you can also choose a vortex flow meter or a porous balance (orifice plate); however, the price will be a bit higher in that case.
For accuracy, use a thermal mass flow meter; for affordability, use a domestic vortex street meter.
Vortex street meters with temperature and pressure compensation – ours are of good quality; we’d be happy to work together if there’s a chance
A DN150 metal float flow meter probably isn’t much cheaper either
Cheapness is relative; it’s still cheaper than vortex flow meters
Differential pressure, vortex street type; thermal types have poor cost-performance – not recommended