DOE-2 Energy Modeling Summary - Courthouse
Page 21 of 26
F.
LEEDTM ENERGY ANALYSIS
A LEED Reference Case was developed to determine the number of credits earned by the
Baseline GSA building.
SUMMARY OF DIFFERENCES BETWEEN BASELINE CASE AND LEEDTM REFERENCE CASE
GSA Baseline Case
LEEDTM Reference Case (ASHRAE 90.1)
Windows (Base glass):
Windows:
C 1" Insulating glass (2 - 1/4" panes with
C Shading coefficient
0.45
C Visible transmittance
78%
" air space), low-E
C Ucenter of glass
C Ufenestation
0.32
0.57
C Visible transmittance
57%
C Shading coefficient
0.35
C With thermally broken aluminum frame
C Ufenestration
0.43
Windows (Curtain wall glass):
Windows:
C 1" Insulating glass (2 - 1/4" panes with
C Shading coefficient
0.45
C Visible transmittance
" air space), low-E
78%
C Ucenter of glass
C Ufenmestration
0.32
0.57
C Visible transmittance
57%
C Shading coefficient
0.35
C Without thermally broken aluminum
frame
C Ufenestration
0.59
Exterior wall construction
Exterior wall construction (Stone wall)
C 3" Stone
C 3" Stone
C 1" Air space
C 1" Air space
C 8" CMU
C 8" CMU
C 1" Extruded polystyrene (R-5/in.)
C ASHRAE insulation
C 5/8" Gypsum wallboard
C 5/8" Gypsum wallboard
C U-value=0.119 (includes air films)
C U-value= 0.151 (includes air films)
Exterior wall construction (Panel wall)
Exterior wall construction
C 4" Concrete
C 4" Concrete
C 1" Extruded polystyrene (R-5/in.)
C ASHRAE insulation
C 6" Steel stud w/R-19 batt insulation)
C 1/2" Gypsum wallboard
C 1/2" Gypsum wallboard
C U-value= 0.151 (includes air films)
C U-value=0.066 (includes air films)
APPENDIX I - GSA LEED COST STUDY
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