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

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

No, if you use the R value -- there will be no consideration
of thermal mass in your materials.

If you use the regular defintion, L ,Cp, D, then there will be thermal
mass consideration in the materials.

In general, you should limit the use of "nomass" materials in a
building -- use very few of them.

At 06:39 AM 2/22/2012, Eng.Amin M. wrote:

Thanks Linda for answer,

Let me explain what I understood from you, correct me if I'm not,

You mean that if I used R value , the thermal mass value which it should have been stored in the materials will act as heat gain inside the building during summer which leads for more heat  load?

 

best regards,

Ameen Mattar

 

---

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: linda@xxxxxxxxxxxxxx
Date: Wed, 22 Feb 2012 06:14:57 -0700
Subject: Re: [EnergyPlus_Support] Re: Material & Material:NoMass

 
If you choose the R only (nomass) materials, you will lose the ability for your building to have thermal mass "storage" in its materials. 

At 12:15 AM 2/22/2012, syrianboy2002 wrote:

Maybe my question wasn't clear 100%.

I mean what is the benefit of evaluating of transient conducion effects in "material" object? and if I used "Material:Nomass" what am I losing practically if it's assuming steady state heat conduction?

Thanks

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