Location where ducts with different air volumes feed into the same exhaust stack
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The company is upgrading its gas-related systems by combining the two original exhaust stacks into one. One of the fans has an air flow rate of 15,000 cubic feet per hour and a pressure of 5,200 PA； The other fan has a lower air volume, around 5000, while the wind pressure is similar, at 5000 PA. During the renovation, the two air ducts were placed on the same plane, entering the exhaust stack at angles of 180 degrees to each other. Within less than a month of operation, it was found that the flexible connection at the outlet of the fan with the lower air volume was leaking fluid; it is suspected that the air ducts of the two exhaust stacks being at the same height is causing interference in the airflow. I would like to ask the experts: I am planning to modify the air ducts of the intake and exhaust ducts so that one is located at the top and the other at the bottom. Is it better to have the duct with higher airflow at the top, or one with lower airflow? Thank you!
Hehe, your question is too vague; it’s necessary to take into account factors such as pressure, flow rate, the diameter of the outlets of each fan, and the diameter of the main pipes in order to calculate the resistance and related values, which is required for verification. This is called design. It’s only by making arbitrary assumptions that such problems arise. It’s best to find someone with design skills, or there is information on this topic in the book \"Principles of Chemical Engineering\".
I’m not sure if your air intake ducts are at a low height above the ground. If so, it’s possible to build a barrier in the middle of the chimney – one that is slightly larger than the diameter of the ducts. This is how two boilers share one chimney. If you follow what you suggested and position the air intake ducts at different heights, then definitely the area with lower pressure will be on top, while the area with higher pressure will be at the bottom