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FullInteriorAndExterior VS FullExterior

asked 2019-10-03 03:32:29 -0500

JepsonYU gravatar image

updated 2020-01-14 09:41:36 -0500

I am a new beginner of EnergyPlus. I saw it in the Document of EngineeringReferece that FullInteriorAndExterior cannot be used in non-convex model. Does anyone know the reason? I thought FullInteriorAndExterior should be more accurate but cannot configure out why it cannot be used in non-convex model.

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answered 2019-10-03 10:32:22 -0500

I believe it has to do with the calculated radiation heat transfer between surfaces. In non-convex geometry, there will exist (at least) two surfaces which cannot 'see' one another, and thus it is not possible for them to trade/balance radiation heat transfer. In convex geometry, every wall can 'see' every other wall and thus can transfer heat.

An example of non-convex geometry is an L Shape. The right wall of the upper part and the right wall of the lower part cannot 'see' on another to transfer heat. For convex, a box or a pentagon, all of the surfaces can 'see' each of the other surfaces; and no heat balance/transfer problem.

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Thank you for you answer. It's amazing to get an answer so fast. Is that that means the algorithm of radiation calculation in Energy+ takes no consideration of the inner face or outside face. To use the example of L Shape room. Obviously, the right wall A of the upper part should not transfer radiation heat to the right wall B of the lower part which is not in front of inside face of wall A. But in FullInteriorAndExterior, radiation form A to B would be calculated by mistake. I tried to upload a illustration picture in this comment, but it seems to be no image upload function.

JepsonYU gravatar imageJepsonYU ( 2019-10-07 20:27:36 -0500 )edit

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Asked: 2019-10-03 03:32:29 -0500

Seen: 97 times

Last updated: Oct 03 '19