Induction Terminal Units

[GreatSmoky]

Does anybody have experience in these units? These units have a venturi tube section (Bernoulli effect)that inducts in return air without an assistance of a fan. I am designing one and have a question on how to calculate the induction velocity versus the static pressure drop through the venturi tube?

Example: If my static pressure upstream of the tube is at 8"wg and downstream of the tube is 7"wg, the pressure differential creates a local vacuum and inducts air into a secondary opening. What would be the velocity of air as it enters the opening?

 

[willard3]

You are going to have to ask the mfg for a drawing of the nozzle to know this. I think the nozzles are proprietary and they are not likely to share.

 

[cdxx139]

sounds like manufacturer info as stated above.

They have different nozzles for different pressurs. From memory you can get 2:1, 3:1 or 4:1 return air to primary air ratio, depending on the upstream pressure.

knowledge is power