[Equest-users] BDl Error

[Nick Caton]

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.

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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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