The natural ventilation can be incorporated and control through the following steps
1. Define the ventilated surfaces as window or door in the sketchup model
2. Define the ventilation control zone temperature set point schedule in schedule:Compact
3. In AFN define an objective in airflownetwork:simulation control
4. select zone in Airflownetwork:Multizone:zone
5. select surfaces in Airflownetwork:Multizone:surface
6. Define objectives in Airflownetwork:Multizone:component:Detailedopening
Here it should be remember that though the step 6 is after the step 5, the step 5 can not completed without step 6. So step 6 need to be define before step
On Thursday, May 26, 2016 6:53 PM, "'Edward G. Lyon' eglyon@xxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
AFN also has a crack definition for surfaces. I often use this with a very large flow capacity to create open passages or I define a flow based on a known or
assumed leakage rate.
Ned Lyon, P.E. (MA, WV)
Staff Consultant
Staff Consultant
SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct
617.285.2162 mobile
781.907.9009 fax
www.sgh.com
781.907.9000 main
781.907.9350 direct
617.285.2162 mobile
781.907.9009 fax
www.sgh.com
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Thursday, May 26, 2016 7:29 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Problem Defining Opened floor
Sent: Thursday, May 26, 2016 7:29 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Problem Defining Opened floor
As long as the openings are not horizontal, AFN is okay. Model the openings as windows with thin clear glass. Assign them as always open and on for natural ventilation. One bit that I'm unsure of is the window u-value. There is no window so I don't think
energy should be transferred via this hole area in this mode. If the air were standing, then the conduction of heat in air would count, but air never stands and the AFN takes care of mass transfer into the zone. So really your glazing should be a perfect insulator
to not double count heat transfer, because it's not there. So you may need to increase the insulation rating of the walls to either sides of the hole to make up the nonsensical heat transfer over glazing that does not exist. It depends on the amount of open
area and the error in heat transfer.
Sorry for the long post. Your second option is to model the open to outdoors zones as simply not a zone and external. Walls, etc. are then simply shading surfaces.
Hello everyone.
I need your support for I problema I have with energy plus.
I have to design a building with Natural Ventilation.
The problem is that the first story is completely oppened to the environment and I don't know how to define these openings for Airflow with natural ventilation...
So the idea is to calculate the contribution of the openings for the whole building, considering the same as the main source of fresh air.
There is no HVAC system, everything Works with Natural Ventilation.
Please help
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Posted by: <barmansankar45@xxxxxxxxx>
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