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