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Re: [EnergyPlus_Support] very high U-value
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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