[Equest-users] BDL Error

[Kelsey VanTassel]

Hello Thomas,
I don't think you can make a construction where all the layers are R-value inputs. For a construction to have layers the program must be able to calculate some mass for the wall. If you want to specify only the thermal resistance of the wall choose "u-value input" when you create a new construction and put in the overall u-value for the wall assembly.

Kelsey Van Tassel
Mechanical Engineer | kvantassel at sustaineng.com<mailto:kvantassel at sustaineng.com>

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Thomas Vu
Sent: Tuesday, June 01, 2010 7:38 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] BDL Error

All,

I get the following BDL error in my model

WALL has no heat capacity. U-Value used.

I am modeling the baseline envelope as prescribed in Appendix G of 90.1-2004.  Referring to Appendix A of 90.1-2004 to model the baseline envelope, I  created layers for the wall construction seen in the attached screenshot.  The resulting U-value for the wall is 0.124.  Can I not model a wall in this manner?  It seems specifying the U-value alone in the construction layer would do the same thing.

Thomas Vu, E.I.
Graduate Student
Dept. of Mechanical and Aerospace Engineering
University of Florida
vietdrum at ufl.edu

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