[Equest-users] window, framing combined U-value

[John Shen]

I am wondering if this method seems appropriate for
determining the U-value of glazing combined with framing. For my purposes I am
not concerned with meeting LEED criteria I am just wondering if there is
anything that is wrong or overlooked with this method.


Method:

Based on whatever information I have on the window I
recreate it the best I can in WINDOW 6.3 which allows for SHGC values at
different angles as well as a combined U-value which can be put into a DOE2 report. However eQUEST will only import
the glazing information (haven’t found a way around this) which gives me the
SHGC at different angles based on glazing however the U-value does not include
framing. So, I go back into WINDOW 6.3 and tell it to generate a detailed
report which tells me the combined U value of glazing and framing among other
things. I then go into my eQUEST .inp file and edit the U value in the Glass
type code.


"Exterior Glazin" = GLASS-TYPE-CODE 

   DESCRIPTION      = *Exterior Glazin*

   NLAYER           = 2

   GAPS-THICK       = ( 12.7, 0, 0, 0 )

   GAPS-COND        = ( 0.02407, 0, 0, 0 )

   GAPS-DCOND       = ( 7.76, 0, 0, 0 )

   GAPS-VISC        = ( 1.722, 0, 0, 0 )

   GAPS-DVISC       = ( 4.94, 0, 0, 0 )

   GAPS-DENS        = ( 1.292, 0, 0, 0 )

   GAPS-DDENS       = ( -0.0046, 0, 0, 0 )

   GAPS-PR          = ( 0.72, 0, 0, 0 )

   GAPS-DPR         = ( -0.0002, 0, 0, 0 )

   TSOL             = ( 0.245, 0.246, 0.243, 0.238,
0.231, 0.219, 0.191, 

         0.139,
0.064, 0, 0.204 )

   TVIS             = ( 0.638, 0.642, 0.633, 0.621,
0.605, 0.572, 0.5, 0.362, 

         0.168, 0,
0.532 )

   ABS-1            = ( 0.216, 0.219, 0.223, 0.226,
0.226, 0.227, 0.234, 

         0.236,
0.191, 0, 0.223 )

   ABS-2            = ( 0.016, 0.017, 0.017, 0.017,
0.017, 0.017, 0.017, 

         0.015, 0.011, 0, 0.016 )

   RBSOL-HEMI       = 0.392

   RBVIS-HEMI       = 0.205

   SHDCOF           = 0.303

   PANES-TIR        = ( 0, 0, 0, 0, 0 )

  
PANES-EMIS-F     = ( 0.838, 0.84,
0, 0, 0 )

  
PANES-EMIS-B     = ( 0.018, 0.84,
0, 0, 0 )

   PANES-THICK      = ( 5.7, 5.7, 0, 0, 0 )

   PANES-COND       = ( 176.6, 175, 0, 0, 0 )

   U-CENTER         = 2.155 
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<   I CHANGE THIS !!!!

   GAPS-FILL        = ( Air, Air, Air, Air )

   PANES-ID         = ( 5439, 103, 0, 0, 0 )

   ..

I change U-CENTER to the U value given to me by WINDOW 6.3. Does
everything seem appropriate? I am trying to avoid using simplified method for
glazing.

Also when I run the simulation and look at the SIM report
section LV-H Details of Windows I find the CENTER-OF-GLASS U-VALUE to be much lower
than the value WINDOW 6.3 came up with. What kind of further calculations does
eQUEST do with the U-value I have provided to come up with the U-value shown in
the report?

Any input would be greatly appreciated. Thanks.
John 		 	   		  
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