Outlet vent vs. Pressure Outlet

Diger · January 12, 2016, 18:44

What is precisely the difference here?
I cant really see when what is prefered?! :-(

LuckyTran · January 15, 2016, 00:44

The outlet vent allows you to specify a loss coefficient to simulate/model a minor loss (pressure drop across the vent). The outlet vent boundary condition is useful when you have say a filter or screens at the exit and you want to model this effect. The vent BC was popularly applied in HVAC fields.

Diger · January 15, 2016, 06:44

Hey,
THX for your answer. Why would a pressure drop acrros the vent imply a loss!?!
U dont mean pressure drop along the direction of flow, or?

LuckyTran · January 15, 2016, 08:56

I am referring to minor head loss as defined per the Darcy-Weisbach equation.

January 12, 2016, 18:44	Outlet vent vs. Pressure Outlet	#1
Diger Senior Member Join Date: Nov 2015 Posts: 135 Rep Power: 12	What is precisely the difference here? I cant really see when what is prefered?! :-(

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January 15, 2016, 00:44		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,845 Rep Power: 68	The outlet vent allows you to specify a loss coefficient to simulate/model a minor loss (pressure drop across the vent). The outlet vent boundary condition is useful when you have say a filter or screens at the exit and you want to model this effect. The vent BC was popularly applied in HVAC fields.

January 15, 2016, 06:44		#3
Diger Senior Member Join Date: Nov 2015 Posts: 135 Rep Power: 12	Hey, THX for your answer. Why would a pressure drop acrros the vent imply a loss!?! U dont mean pressure drop along the direction of flow, or?

January 15, 2016, 08:56		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,845 Rep Power: 68	I am referring to minor head loss as defined per the Darcy-Weisbach equation.