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Re: [EnergyPlus_Support] very high U-value

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] very high U-value
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Tue, 30 Oct 2007 13:05:32 -0600
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Yes, but 17 is the conductance without film (convection) coefficients.  To see 
nominal u-values with film coefficients, use REPORT, SURFACES, DETAILS.

Mike


On 29 Oct 2007 at 10:27, Edwin Lee wrote:

> Yes, the U-Value can be represented by conductivity over thickness, 1.7 / 0.1 is
> about 17.
> 
> ----- Original Message ----
> From: Simge Andolsun <simgeandolsun@xxxxxxxxx>
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Sent: Monday, October 29, 2007 11:01:58 AM
> Subject: [EnergyPlus_Support] very high U-value
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>             Linda Lawrie,
> 
> 
> 
> For a simulation study, I defined the name and the layers of the floor
> 
> construction as shown in Table 1. I then entered the HF-C5 with the
> 
> properties listed in Table 2 into MATERIAL:REGULAR object of EnergyPlus
> 
> (Table 1).
> 
> 
> 
> Table1. CONSTRUCTION
> 
> 
> 
> Name        LTFLOOR
> 
> Outside Layer        HF-C5
> 
> 
> 
> Table2. MATERIAL:REGULAR
> 
> 
> 
> PROPERTIES        HF-C5
> 
> Roughness        Medium rough
> 
> Thickness (m)        0.1015
> 
> Conductivity (W/m-K)        1.7296
> 
> Density (kg/m3)        2243
> 
> Specific Heat (J/kg-K)        837
> 
> Absorptance: Thermal        0.9
> 
> Absorptance: Solar        0.65
> 
> Absorptance: Visible        0.65
> 
> 
> 
> I ran the simulation and EnergyPlus calculated the U value of the floor as
> 
> 17.04. This value is very high and it does not seem to be right. What do
> 
> you think? I would like to know more about how EnergyPlus calculates the
> 
> U-values of floors. Where may I get this information from?
> 
> I would be glad if you could help me.
> 
> 
> 
> ps: the related .idf file is attached to this e-mail.
> 
> 
> 
> Thanks in advance for your reply,
> 
> Simge Andolsun
> 
> 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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References:
- Re: [EnergyPlus_Support] very high U-value
  - From: Edwin Lee

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