[BLDG-SIM] Floating Point Error from Glass Conductance

[Mike Johnston]

Message from Kristin Field below.

 

  _____  

From: Kristin Field 
Sent: Monday, October 22, 2007 3:13 PM
To: Mike Johnston
Subject: FW: Floating Point Error from Glass Conductance

 

Here’s the message – thanks for sending!

 

From: Kristin Field 
Sent: Monday, October 22, 2007 3:11 PM
To: 'bldg-sim at gard.com'
Subject: Floating Point Error from Glass Conductance

 

Has anyone else experienced a floating point error during loads
calculations when changing the value of GLASS-CONDUCT?  I started with a
value of 1.6, then changed to 0.46.  The GLASS-CONDUCT = 1.6 runs fine,
but the GLASS-CONDUCT = 0.46 crashes during the loads program due to a
floating point error “K-02.”  I double- and triple-checked, and these
glass conductance values are the only changes between runs.  Actually,
trying other values showed than it didn’t stop crashing until the
conductance got as high as about 1.2.  So much for decent windows!

 

I have done several models before in which glass conductance was varied
to show savings between different window products, but this has never
happened to me.  Any help is appreciated!

 

Thanks,

Kristin

 

***************************************************************

Kristin M. Field, EI

Energy Analysis Group

Architectural Energy Corporation

2540 Frontier Ave., Suite 201

Boulder, CO  80301

303.444.4149

 




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