RE: [EnergyPlus_Support] Re: Material & Material:NoMass

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

Calculated U values are shown in the output file (.eio) when
you add the report for Constructions:

Output:Constructions,Constructions,Materials;

The object is described in the Input Output reference and the output in
the Output Details documents.  These are shown without film
coefficients because film coefficients vary during the
simulation.

To change the U value, you would need to change the inputs.

Output:At 02:14 AM 2/23/2012, Eng.Amin M. wrote:

Thanks for your helpful answers,
I still have a question regarding this class:
After I define the materials and input them, How can I know the total U value of the construction? because our local codes oblige us now to exceed certain value for each construction. Is there anyway -after knowing U value- to modify it?
 
Regards,
 

---

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: linda@xxxxxxxxxxxxxx
Date: Wed, 22 Feb 2012 10:35:53 -0700
Subject: Re: [EnergyPlus_Support] Re: Material & Material:NoMass

 
That is a problem that is being worked on for the next release.

At 10:18 AM 2/22/2012, CleanTech Analytics wrote:

Also I have noticed that the finite difference algorithm for simulating Phase Change Materials does not converge when any materials no mass are used.

On Wed, Feb 22, 2012 at 8:07 AM, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:

 

That is correct, if you have some layers with nomass, the whole construction will still be okay (providing thermal mass properties to the building) if they are using the "regular" properties.

At 09:02 AM 2/22/2012, Jean marais wrote:

just that layer has no mass, not the whole contruction...? I.e. I assume that a no mass layer does not nullyfy the internalmass of the entire contruction, right?

--

Jeremiah D. Crossett

CleanTech Analytics

503-688-8951

www.cleantechanalytics.com

 

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