RE: [EnergyPlus_Support] Internal Mass with "FullInteriorAndExterior" Solar Distribution Model

["Linda Lawrie linda@xxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

I think the "use with caution" means when you use
the "FullInteriorAndExterior" solar distribution model -- and
lump internal partitions into "Internal Mass" then places
inside the zone would see solar gain where they wouldn't if the internal
parititions were modeled as surfaces.

 At 07:53 AM 1/17/2015, 'Edward G. Lyon' eglyon@xxxxxxx
[EnergyPlus_Support] wrote:


> As I understand it, the internal
> mass object does not see direct solar gain.  I have also found that
> it is sensitive to area defined.  That means you canâ??t just make a
> random object with total mass you want to simulate.  The mass object
> should have the surface area of what you are representing.  
>  
> Ned Lyon, P.E. (MA, WV)
> Staff Consultant 
> SIMPSON GUMPERTZ & HEGER 
> 781.907.9000 main
> 781.907.9350 direct  
> 617.285.2162 mobile  
> 781.907.9009 fax
> www.sgh.com
>   
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [
> mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] 
> Sent: Friday, January 16, 2015 5:44 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx;
> EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Internal Mass with
> "FullInteriorAndExterior" Solar Distribution Model
>  
>   
> Dear EnergyPlus_Support,
> Please excuse the accidental cross-posting.
>  
> I am trying to understand how the internal thermal mass (aka
> "InternalMass") is being handled in my EnergyPlus models. On
> page 222 of the EnergyPlus Input-Output Reference it states,
> "simplifying calculations using internal mass must be used with
> caution when the "FullInteriorAndExterior" Solar Distribution
> model is chosen. 
>  
> Could anyone kindly help me understand what "use caution"
> means?  Does that mean that my internal thermal mass does not
> "see" the solar radiation potentially hitting it (which might
> realistically be the case for certain interior elements if they are
> always in shade)?  However, would you assume that this internal mass
> is still exposed to the indoor air, and thus could still be absorbing or
> emitting heat in that way?
>  
> Many thanks for any guidance.
> Best,
> Holly
>  
> Holly W. Samuelson, DDes, LEED, AIA 
> Assistant Professor Harvard Graduate School of Design  
>

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Posted by: Linda Lawrie <linda@xxxxxxxxxxxxxx>

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