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R/U Value Calculations
Heat Gain Calculations
Walls
Conduction & Radiation Roof Hrw = (A)(U)(DETD) 6349.9619ft^2 x 0.17 x 25 = 26987.34 BTUH
Outside Air Film Plywood Sheath. 3 ½” Fiberglass Batt ½” Drywall Inside Air Film
0.17 0.63 11.00 0.45 0.92
Total R Total U (1/13.17)
13.17 0.076
Glass (Rad) Hgr = (A)(Sq)(SC) 3120.3102ft^2x 41 x 40 = 5117308.73 BTUH Glass (Cond) Hgc = (A)(U)(ti-to) 3120.3102ft^2 x 0.24 x 60 = 44932.47 BTUH
Roof Outside Air Film Green Roof Comp. Insulation Conc. Deck Inside Air Film
0.17 N/A 3.5 1.35 0.92
Lights/Equip Hi = (3.4)(watts) 3.4 x 3W = 10.2 BTUH People
Total R Total U (1/5.94)
5.94 0.17
Windows Outside Air Film Triple Insul. Glaz. Inside Air Film
0.17 3.0 0.92
Total R Total U (1/4.09)
4.09 0.24
Hp = (n)(M) 10 x 650 = 6500 BTUH Total Heat Gain (Sensible) HGs = Hrw + Hgr + Hgc + Hi + Hp HGs = 5195738.74 BTUH Total Heat Gain (Sensible and Latent) HGsl = (HGs)(1.2) HGsl = 6234886.49 BTUH
Equipment Sizing Heat Loss Calculations Conduction Loss Walls Hw = (A)(U)(ti-to) 525.19 ft^2 x 0.076 x 60 = 2394.87 BTUH Roof Hr = (A)(U)(ti-to) 6349.9619 ft^2 x 0.17 x 60 = 64769.61 BTUH
Glazing Hg = (A)(U)(ti-to) 3120.3102 ft^2 x 0.24 x 60 = 44932.47 BTUH
Total required supply CFM Qs = HL/[(1.08)(te-t)] 210093.25/[1.08x(130-70)] 210093.25/[1.08x(130-70)] = ~3500 CFMs 14 Registers in Assembly Hall 3500/14 = 250 CFM per register Registers Two-way Four-way
3 11
Slab Edge He = (P)(F)(ti-to) 328.12 x 0.55 x 60 = 10827.96 BTUH
Total required return CFM* Qr = CFM(1.5) 6500 CFM x 1.5 = 9750 CFMr
Slab/Bsmt Hs = (A)(F) 5426.4389 ft^2 x 4.0 = 21705.76 BTUH Convection Loss Infiltration Hi = (.018)(ACH)(V)(ti-to) 0.018 x 0.85 x 71310 ft^3 x 60 = 65462.58 BTUH
5 Registers in Assembly Hall 9750/5 = 1975 CFM per register
Zoning Z1 – Z1 – Adj. to Glazing (4-way) Z2 – Z2 – Central Area (4-way) Z3 – Z3 – Rear Wall (2-way)
Total Heat Loss HL = Hw + Hr + Hg + He + Hs + Hi HL = 210093.25 BTUH Z3
Z2
Z1
* = accidentally used 6500 instead of 3500, all return duct sizing corresponds to 9750 CFM as a result
