[Equest-users] BDl Error

[Nick Caton]

Ramesh,

 

This is an odd problem, but for now, I think you need to either (A) choose a different interior ceiling type (drywall/acoustic), or else (B) go to detailed, change the “Ceilg Construction” construction to “U-value Input,” type – 0.87, and then right-click delete the “Ceilg Cons Layers” in the component tree – either route will allow the model to run.

 

All,

 

I think this is a bug in the SD wizards…

 

The SD Wizard-generated layers construction for “Plaster Ceiling,” for interior ceilings is causing the BDL error as follows:

 

*ERROR*****Cannot simulate LAYERS Ceilg Cons Layers as given. The wall is too

            thin or too light. THICKNESS and/or DENSITY*SPECIFIC HEAT is too

            small. Use U-VALUE CONSTRUCTION.

 

The preceding line is:

 

               COMMON RATIO =    0.0000009191               U-VALUE =    0.8696221113

 

0.87 isn’t odd, and library gyp board is the only layer defined aside from the final air film layer.  The problem goes away if “drywall” or “acoustic” ceiling is selected instead.  

 

~Nick

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

 

 

________________________________

From: ramesh buddhi <ramesh at greenevolution.in>
To: Nick Caton <ncaton at smithboucher.com>; equest-users at lists.onebuilding.org
Sent: Tue, 29 June, 2010 11:00:43 AM
Subject: Re: [Equest-users] BDl Error

Hi Nick

Thanks a lot for your prompt reply, as requested please find the attachment of the complete project file. 

The layers 
"Ceilg Cons Layers" = LAYERS
   MATERIAL         = ( "Gypsum  LW Agg 3/4in (GP04)" )


"Ceilg Construction" = CONSTRUCTION
   TYPE             = LAYERS
   LAYERS           = "Ceilg Cons Layers"

are getting created automatically please let me know where i am wrong. And one more clarification I had created four storey building if you look at the model it has an gap of one floor I do not where i am wrong.


Thanks
Ramesh BR

 

 
  New No.110 / Survey No. 151/1, Mahatma Gandhi Road 
  Thiruvanmiyur, Chennai 600041 INDIA
  Web: www.greenevolution.in
  Land: +91-44-4201-8369
  Cell : +91-99406-19915

 

 

________________________________

From: Nick Caton <ncaton at smithboucher.com>
To: ramesh buddhi <ramesh at greenevolution.in>; equest-users at lists.onebuilding.org
Sent: Mon, 28 June, 2010 9:01:00 PM
Subject: RE: [Equest-users] BDl Error

Ramesh,

 

For future reference, you need to send out more than your pd2 file for others to be able to view your model.  In this case, you should at minimum send the pd2/inp, and you’d want to include the non-library weather file as well if you anticipated others might need to run simulations to troubleshoot.  That said, I think I can guess at the source of this error without looking at your model:

 

When defining a custom construction (or modifying a wizard construction) -  you cannot define too many layers using the “simplified” method with only an R-value.  This is how simpler programs like HAP/TRACE operate – I suppose they assume thermal massing figures, if retained/transferred heat is modeled at all.  This input method for construction layers exists in eQuest specifically to define things like air film which have no appreciable thermal mass.  

 

If the total defined thermal mass of the wall is too low or zero, the program giving you an error like this because it is recognizing that the energy model will behave unlike any real construction.

 


~Nick

 



 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of ramesh buddhi
Sent: Friday, June 25, 2010 2:27 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] BDl Error

 

Hi

I am using eQuest 3-63 can any one help me out on the below error please find the attachment.

 TYPE=PROPERTIES TH=0.0625 COND=0.1330 DENS=45.0 S-H=0.2   ..
Cannot simulate LAYERS Ceilg Cons Layers as given. The wall is too thin or too light. THICKNESS and/or DENSITY*SPECIFIC HEAT is too small. Use U-VALUE CONSTRUCTION.


BDL Error

cannot simulate Layer ceilg cons layers as given. The wall is too thin too light. Thickness and/or Density*specific heat is too small. Use U-Value construction.

Thanks
Ramesh BR

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