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RE: [EnergyPlus_Support] adiabatic surface
Edwin is right. The usual way of approximating an adiabatic wall is to
set the other side boundary conditions to be the same as on the inside.
But if the wall has thermal mass, then it can still store energy. To
have a "more adiabatic" wall, you can increase the R-value and use
Regular-R materials. Or you can eliminate the surface all together.
Opaque Surface Inside Face Conduction is notorious for confusing users,
so be careful when interpreting its values.
________________________________
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Edwin Lee
Sent: Sunday, December 02, 2007 10:47 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] adiabatic surface
Don't count my reply as a valid reply from the E+ team, but I'll give it
a shot.
Even though the wall is set to adiabatic, as the wall stores up energy,
there will be some inside face conduction moving toward the inside of
the wall. This is all because of the transient heat storage modeled in
the wall. If you were to see outside face conduction, I'm sure it would
be either zero or very close to zero.
Edwin
----- Original Message ----
From: anca_unica <anca_unica@xxxxxxxxx <mailto:anca_unica%40yahoo.com> >
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com>
Sent: Sunday, December 2, 2007 9:21:44 AM
Subject: [EnergyPlus_Support] adiabatic surface
Dear EnergyPlus Support Team:
I tested the variable Opaque Surface Inside Face Conduction of an
adiabatic wall. The result suggests that heat transfer is not 0 Watt!?!
I can't understand why. Can you tell me the reason?
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