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Defining an Always-Open Entrance Exposed to Outdoor Conditions

asked Apr 26

Zakaria's avatar

updated May 13

Hellow everyone,

I am currently working on a construction model (here) that includes an always-open entrance that is directly exposed to outdoor conditions.

Here's what I've tried so far: I set up a very thin door construction for the entrance using the Material:NoMass object, with a thermal resistance of 0.00385 m2.K/W. However, it seems like this setup isn't quite realistic since it doesn't account for infiltration, given that the entrance is exposed to outdoor conditions.

I am seeking guidance on the appropriate method to define this opening to specify the properties of air flow through it.

Also, if anyone is familiar with the AirFlowNetwork (AFN) model, I'd appreciate any guidance on how to use the AFN for modeling the infiltration through the entrance.

Thank you in advance for any assistance you can provide.

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answered Apr 29

updated Apr 30

I would treat it as outdoors and include the surfaces on the sides, back, and top of the entrance as part of the envelope that separates the interior from the exterior of the building.

The top view layout of the building from ground level to the top of the entrance would be:

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Thanks @JasonGlazer for your response Could you possibly provide a more in-depth explanation? My knowledge of EnergyPlus is limited.

Here's what I've tried so far: I set up a very thin door construction for the entrance using the Material:NoMass object, with a thermal resistance of 0.00385 m2.K/W. However, it seems like this setup isn't quite realistic since it doesn't account for infiltration, given that the entrance is exposed to outdoor conditions.

Zakaria's avatar Zakaria  ( Apr 30 )
1

Forget the idea that the "entrance" is an interior room of the building and instead define the building perimeter to go inwards at that point.

JasonGlazer's avatar JasonGlazer  ( Apr 30 )

Thanks for the response! Just to clarify, I might not have explained the issue clearly.

I am modeling a refrigerated warehouse that is composed of 13 zones, 12 walk-in coolers, and a loading zone. The loading zone has an entrance that is always open (see figure above).

Sorry for any confusion.

Zakaria's avatar Zakaria  ( Apr 30 )

I am currently doing some refrigerated warehouse modeling. Have you tried looking at the RefrigeratedWarehouse example model in E+? Below are comments from the IDF.

! Refrigeration load is highly dependent upon infiltration rates (ACH). Air chillers ! and refrigeration systems oversized to allow possible increase above rates used here. ! An effective Air Barrier System has been assumed in selecting the rates modeled here. ! A common InfiltrationSchedule has been used for all zones with adjustments for ! likely use made using the ZoneInfiltration:DesignFlowRate objects.

sashadf1's avatar sashadf1  ( May 1 )

How about the AirFlowNetwork (AFN) model?

According to the EnergyPlus documentation, AFN is an advanced model designed to compute natural infiltration influenced by wind and forced air.

Can AFN be utilized to simulate infiltration through entrances?

I've looked into some EnergyPlus examples, but navigating them is challenging given my limited understanding of EnergyPlus. It's frustrating that explanatory documentation for the examples isn't available.

Zakaria's avatar Zakaria  ( May 3 )

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Asked: Apr 26

Seen: 167 times

Last updated: May 13 '24