[BLDG-SIM] Thermal mass walls

[K Emerson]

I hate to suggest bringing reality into this, but a
little research into examples provided by the
manufacturer might be in order.  With the owner's
permission, the local utility companies where the
various types of construction have been in operation
should be able to release energy data.  

Keith Emerson

PS Beware of bridging paths in the metal construction.
 

--- Jeff Haberl <jhaberl at esl.tamu.edu> wrote:
> Couple of questions:
>  
> 1. What is the freezer floor? Is it insulated? 
>  
> 2. What are the exterior conditions? Is this freezer
> in an unconditioned
> warehouse?
>  
> 3. Are you using custom weighting factors or
> pre-calculated weighting
> factors?
>  
> Jeff
> 
> 
> 8=!   8=)  :=)   8=)   ;=)   8=)   8=(   8=)   8=() 
>  8=)   8=|   8=)   :=')
> 8=)   8=)   8=? 
> 
> Jeff S. Haberl, Ph.D.,
> P.E.............................jhaberl at esl.tamu.edu
> 
> Associate
> Professor....................................Office
> Ph:
> 979-845-6507 
> Department of
> Architecture...........................Lab Ph:
> 979-845-6065 
> Energy Systems
> Laboratory...........................FAX:
> 979-862-2457 
> Texas A&M
>
University..................................77843-3581
> 
> College Station, Texas,
> USA...........................URL: www-esl.tamu.edu 
> 
> 8=/   8=)  :=)   8=)  ;=)   8=)   8=()   8=)   :=)  
> 8=)   8=!   8=)   8=?
> 8=)   8=)   8=0   
> 
> -----Original Message-----
> From: postman at gard.com [mailto:postman at gard.com]On
> Behalf Of Mark E. Case
> Sent: Tuesday, June 24, 2003 3:45 PM
> To: BLDG-SIM at gard.com
> Subject: [BLDG-SIM] Thermal mass walls
> 
> 
> 
> Ok - here's a question, maybe stimulate a little
> controversy but as many of
> you know -  that's the way I like it. 
> -10 F freezer, 100,000+ square feet. Reasonably
> steady product loading 24
> hours a day (say 90 tons +/- 25 tons in a given
> hour).
> 
> Two envelope systems: 5" metal skin panel with
> expanded polyurethane vs.
> thermal mass panel of 8" HW concrete interior, 6"
> extruded polystyrene,
> 2-1/2  HW concrete exterior.
> 
> Polyu conductivity .0142 btu/h-ft-F (LTTR basis).
> Metal skin wall U without
> external skin resistance (DOE2) = ..033. Polystyrene
> .0167, thermal mass
> wall U = .030.  
> 
> Question - which one is better? That's a loaded
> question but from a strictly
> thermal performance measure -  kWh per year to cool
> - is there more
> difference than the .030 vs. .033 U-value would
> imply?.
> 
> We are using eQuest (Doe2.2) and it show the thermal
> mass as `slightly'
> better. The manufacturer, based largely on
> testimonial evidence, insists it
> is MUCH better. 
> 
> One issue that they raise is infiltration through
> the metal skin panels and
> the impact on in-situ R value. They site ORNL test
> results that apparently
> show this but I've not seen them. I know ORNL did
> some testing on apparent R
> of mass walls but it didn't seem conclusive to me
> that it would apply in
> this situation.
> 
> Anyone out there that can cite well documented
> research about the
> differences? Anyone have comments about DOE2's
> strengths and weaknesses in
> capturing the effects of the large wall thermal
> mass?
> 
> 
> Mark E. Case, President 
> etc Group, Inc. 
> 
> 
> 
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