Ventilation balance with different pressure drop and flow requirements
Ventilation balance with different pressure drop and flow requirements
(OP)
Hello,
We have to integrate a ventilation system with two branches. We have a detailed calculation for each branch and it shows that pressure drop curve vs flow is higher in one of them.
Additionally, the flow requirement is that main flow has to be diverted 70% for the branch with higher pressure drop, so some kind of balancing device is needed.
After some work with our CFD consultant and Fan supplier we have two proposals for the balancing, but I am not very confident with any of them.
See file attached.
Any comment or suggestion will be welcomed
We have to integrate a ventilation system with two branches. We have a detailed calculation for each branch and it shows that pressure drop curve vs flow is higher in one of them.
Additionally, the flow requirement is that main flow has to be diverted 70% for the branch with higher pressure drop, so some kind of balancing device is needed.
After some work with our CFD consultant and Fan supplier we have two proposals for the balancing, but I am not very confident with any of them.
See file attached.
Any comment or suggestion will be welcomed
RE: Ventilation balance with different pressure drop and flow requirements
RE: Ventilation balance with different pressure drop and flow requirements
See CFD flow field with proposal deflector position, any comment?
Thanks
RE: Ventilation balance with different pressure drop and flow requirements
On the return & OA intake side the pressure drop from each inlet to the fan suction must be the same for balanced flow (since each inlet is at atmnospheric pressure). Similarly balancing dampers would be required and tees similarly constructed.
RE: Ventilation balance with different pressure drop and flow requirements
That´s what I tried to express with using a custom adjusted "perforated plate" downstream the T junction to match both pressure drops, so using it as damper. am I right?
The installation is a retrofit for a railway vehicle, so a lot of non standards solutions have to be used due to space constraints.