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RE: [EnergyPlus_Support] material conductivity troubleI

What is the solar intensity on the exterior surface?  Are the sruface roughness the same?
Use the DesignDay sizing simulation with different skyclearance and see the differences dure to radiation effect.
Surface roughness changes the convection coefficient.  If you know how to solve the CTF equation with the surface property, you may be able to discover more factors on the properties of material.
 Dr. Li  


To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: rbmeller@xxxxxxxxxxx
Date: Sat, 3 Nov 2012 11:28:54 +0000
Subject: [EnergyPlus_Support] material conductivity troubleI

Hi guys... first of all, sorry about my english 'cause I´m brazilian...
I'm having trouble about simulating with other material. I ran the simulation with a material wich the property goes below:
Name: concreto
thickness: 0.1m
conductivity: 1.75 W/mK
Density: 2300 kg/m³
specific heat: 1000 J/kg.K

The other material is:
name: Concreto celular
conductivity: 0.35 W/mK
Density: 500 kg/m³
Specific heat: 1250 J/kg.K

When I run with concreto celular, the district cooling is higher than concreto. And also the surface inside temperature is higher than concreto. Isn't it strange? The conductivity is lower, but all of the variables shows higher temperature or cooling power higher...

Ps: The concreto celular's absorptance is lower than concreto.

Can anyone help me out?


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