7
22,680 (January)
Internal Heat Gains (Btu / h) = Int. Heat Gains People (Btu/h) =
January:
3,510
22,680 (July) July:
3,510
Internal Heat Gain People = (Area) x (Sensible Heat Gain Btu/h ft2) (Area) 2700
Int. Heat Gains Equip. (Btu/h) =
x
January:
(SHG) = Heat Gain Btu/h 1.3 3,510
13,770
July:
13,770
Internal Heat Gain Equip = (Area) x (Sensible Heat Gain Btu/h ft2) (Area)
Int. Heat Gains Lights (Btu/h) =
x 2700
January:
(SHG) = Heat Gain Btu/h 5.1 13,770
5,400
July:
5,400
Internal Heat Gain Lights = (Area) x (Sensible Heat Gain Btu/h ft2) 8 (Area)
x 2700
(SHG) = Heat Gain Btu/h 2 5,400
15,735,621 (Jan.)
Solar Heat Gain Glazing (Btu / Month) =
14,042,872 (July)
Solar Heat Gain Glazing 9 = (Area of Glazing) x (Radiation Btu/SF Day) x (SC) x (SHGC Glaze) (Day/Mnth) North Façade January July South Façade January July East Façade January July West Façade January July
(Area Glaze) 202.5 202.5 (Area Glaze) 202.5 202.5 (Area Glaze) 270 270 (Area Glaze) 270 270
x (Radiation) 0 151 x (Radiation) 1709 310 x (Radiation) 549 889 x (Radiation) 549 889
x
x
x
x
(SC) 1.00 1.00 (SC) 1.00 1.00 (SC) 1.00 1.00 (SC) 1 00 1.00 1.00
x
x
x
x
(SHGC)10 0.79 0.79 (SHGC)10 0.79 0.79 (SHGC)10 0.79 0.79 (SHGC)10 0 79 0.79 0.79
x (Day/Mnth) 31 31 x (Day/Mnth) 31 31 x (Day/Mnth) 31 31 x (Day/Mnth) 31 31
= Heat Gain Month 0 748,843 = Heat Gain Month 8,475,316 1,537,360 = Heat Gain Month 3,630,153 5,878,335 = Heat Gain Month 3 630 153 3,630,153 5,878,335
Direct Solar Radiation11 Month January July
North Façade 0 151
South Façade 1709 310
East Façade 549 889
7. Heat Gain Coefficients from MEEB (10th ed., Appendix Table F.3 Parts A and B, p.1610). 8. Sensible Heat Gain from lighting g g is based on the Daylight y g Factor for the space. Assumed DF < 1 for Base Case Analysis and DF > 4 for Competition Design Case Analysis 9. SHGC Base Case value assumes clear single glazed for January and no glazing (open windows) for July. For Competition Design Case SHGC is based on type of window best for facade. See Part I: Technical Task #1 for additional information.
West Façade 549 889
10. SC Shading + SHGC Glazing Values from MEEB (Appendix Tables E.15 and E.20, p. 1585 and 1590)) 11. Data collected from PEC Solar Calculator created by Charles C. Benton, and Robert A. Marcial with The PG&E Energy Center, Pacific Gas & Electric Co., 1993. (See Part II: Reference Charts for worksheet).