Re: [EnergyPlus_Support] Why Inside and Outside face temperaures for a floor surface are same ?

[Faran Qureshi <qureshi.faran@xxxxxxxxx>]

Okay thank you it seems I was misinterpreting the explanations for the adiabatic surface.

Sorry I don't want to make drawings now but if this is still unclear I can. 
The purpose of this question is actually that I try to recreate an RC network describing the surface. So I would like to know what the RC network should look like. For each layer, I have a bunch of RC pairs. To maintain the same temperature on each side of the surface, I can then shortcircuit the first and the last nodes.

But then it seems to me that it is as if both sides of the surface are touching the zone. If it is not then I am not sure what it is.

Then my second question is :

Is it possible to simulate in energy+ a surface which is completely insulated from the other side ? I initially thought this was done with Adiabatic surface but apparently not.

Thanks in advance,

Tomasz

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From: Linda Lawrie <linda@xxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Friday, August 9, 2013 5:42 PM
Subject: Re: [EnergyPlus_Support] Why Inside and Outside face temperaures for a floor surface are same ?

 

You've called it an adiabatic surface -- by definition both sides will have the same conditions/temperatures.

InternalMass is used to describe partitions within a zone. Adiabatic surfaces describe surfaces that may have contact with other zones -- but both zones are assumed to have the same conditions.  (ergo, the same temperatures on both sides).

At 07:34 AM 8/9/2013, qureshi.faran wrote:

I have a building model with its floor having one insulation layer. The details are given below. My question is that the energy plus simulation shows me exactly the same temperatures for the Inside and the Outside face of this floor. I am expecting a difference due to insulation layer. How can this be explained ?

  BuildingSurface:Detailed,
    Zn001:Flr001,            !- Name
    Floor,                   !- Surface Type
    Slab Floor with Radiant, !- Construction Name
    ZONE ONE,                !- Zone Name
    Adiabatic,               !- Outside Boundary Condition
    ,                        !- Outside Boundary Condition Object

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