selecting an exhaust fan for a straight duct
selecting an exhaust fan for a straight duct
(OP)
Hello,
I need to select an exhaust fan to extract nitrogen vapour at 77K(-196C) from an enclosed machine of size 1m x 1m x 1.5m through a duct (about 2m long)to the atmosphere. Can anyone explain the calculations i have to do to select the appropriate fan?
I look forward to hearing from you.
Thanks.
I need to select an exhaust fan to extract nitrogen vapour at 77K(-196C) from an enclosed machine of size 1m x 1m x 1.5m through a duct (about 2m long)to the atmosphere. Can anyone explain the calculations i have to do to select the appropriate fan?
I look forward to hearing from you.
Thanks.





RE: selecting an exhaust fan for a straight duct
RE: selecting an exhaust fan for a straight duct
Thanks
RE: selecting an exhaust fan for a straight duct
Where would you exhaust that vapor, which apparently presents health hazard? You should have extremely good mixing with outside air at short distance from exhaust point, means some large effective velocities at the outlet.
I believe you should find very special fan if such exists at all.
RE: selecting an exhaust fan for a straight duct
RE: selecting an exhaust fan for a straight duct
You'll have a very difficult time finding a fan with bearings and lubricant that can cope with your temperatures.
You could power the ejector with a conventional fan or blower.
This would also give you some dilution of the exhaust.
RE: selecting an exhaust fan for a straight duct
RE: selecting an exhaust fan for a straight duct
RE: selecting an exhaust fan for a straight duct
RE: selecting an exhaust fan for a straight duct
kunkol is Offline:
Posts: 1 Designing/selecting an exhaust fan
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Hi all,
I'm a mechanical engineering student working on a group project which involves designing a machine which uses liquified nitrogen during its operation. I want to design an exhaust fan-duct system to extract the the nitrogen vapour to an open environment. I don't know how to go about selecting an appropriate fan or calculations required to ensure the system is efficient; so any help will be appreciated. Thank you.
Kunkol
Did you read the remarks about student posting in this forum?
B.E.
RE: selecting an exhaust fan for a straight duct