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C cavity insulation none sheathing 41 x 92 mm steel

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Unformatted text preview: 97 (Appendix B) Approximate Overall Thermal Transmittance for Typical Wood or Metal Frame Walls (with aluminum or vinyl siding exterior finish and 13 mm gypsum board interior finish) Wood Frame Metal Frame aluminum siding sheathing paper sheathing 38 x 89 mm wood stud @ 406 mm o.c. cavity insulation Sheathing cavity insulation 13 mm gypsum board vapour barrier Wood Frame Wall: 38 x 89 mm @ 406 mm o.c. Cavity Insulation: None sheathing 41 x 92 mm steel stud @ 406 mm o.c. 13 mm gypsum board vapour barrier aluminum siding sheathing paper Cavity Insulation: RSI 2.11 Metal Frame Wall: 41 x 92 mm @ 406 mm o.c. Cavity Insulation: none Cavity Insulation: RSI 2.11 Effective RSI Overall USI Effective RSI Overall USI Effective RSI Overall USI Effective RSI Overall USI no sheathing 0.59 1.705 1.97 0.507 0.48 2.093 1.16 0.859 13 mm gypsum 0.67 1.494 2.07 0.484 0.56 1.795 1.25 0.802 11 mm plywood 0.69 1.457 2.08 0.480 0.57 1.744 1.26 0.791 11 mm OSB 0.71 1.403 2.11 0.473 0.60 1.670 1.29 0.775 RSI 0.88 sheathing 1.49 0.672 2.94 0.340 1.36 0.734 2.19 0.457 RSI 1.32 sheathing 1.93 0.517 3.40 0.294 1.80 0.555 2.63 0.380 Measurement Units: 2 USI = W/m - °C 2 RSI = m -°C/W RSI Adjustments for Exterior Finish: Exterior Finish 13 mm stucco wood siding 100 mm brick + 25 mm air RSI Adjustment -0.10 +0.04 +0.14 Some Approximate Thermal Conductivities of Selected Materials (near “room temperature”, i.e. ∼300 K) Material Thermal conductivity, k [W/m-°C] Aluminum (alloy 2014) ∼ 192 Steel (alloy 1080) ∼ 48 Stainless steel (alloy 31) ∼ 16 Concrete ∼ 0.9 to 2.9 (depends on density) Soda Lime Glass (architectural glass) ∼ 1.0 PVC (vinyl) ∼ 0.18 Wood (spruce) ∼ 0.09 Extruded Polystyrene Insulation (XPS) References: • • ∼ 0.022 to 0.030 W.D. Callister, “Materials Sciences and Engineering”, 3rd Edition, 1994 F.P. Incropera and D.P. DeWitt, “Fundamentals of Heat and Mass Transfer”, 4th Edition, 1996 Aside: Conduction Thermal Resistance of a Plane Wall (1-D conduction; steady-state) = thickness of material, m thermal conductivity, W/m-°C thermal resistance of material Building Energy Performance – Spring 2012 - Topic 7 - Energy Flow through Building Envelope (Part 2) Double-Glazing Unit Construction Detail (Diagram adapted from ASHRAE Handbook of Fundamental 2009 SI) OUTDOORS INDOORS desiccated cavity space filled with air or argon SURFACE #1 #2 #3 #4 glazing pane sightline metal spacer butyl primary sealant urethane secondary sealant Approximate U-Factors (Overall Thermal Transmittance) for Various Fenestration Products Values from ASHRAE Handbook of Fundamentals 2009 (SI) Product Type Single Glazed Double Glazed Double Glazed e = 0.20 on surface 2 or 3 Double Glazed e = 0.05 on surface 2 or 3 Triple Glazed Triple Glazed e = 0.20 on surface 2 or 3 & 4 or 5 Gap 1/4" air 1/2" air 1/4" argon 1/2" argon 1/4" air 1/2" air 1/4" argon 1/2" argon 1/4" air 1/2" air 1/4" argon 1/2" argon 1/4" air 1/2" air 1/4" argon 1/2" argon 1/4" air 1/2" air 1/4" argon 1/2" argon Center of Glass 5.91 3.12 2.73 2.90 2.56 2.56 1.99 2.16 1.70 2.33 1.70 1.87 1.42 2.16 1.76 1.93 1.65 1.65 1.14 1.31 0.97 Fixed Window (total U-value, including frame) (vertical installation; aluminum spacer) Aluminum Aluminum without with Insulated thermal thermal Fiberglass/ break break Vinyl 6.38 6.06 5.40 3.88 3.52 3.04 3.54 3.18 2.72 3.68 3.33 2.86 3.39 3.04 2.58 3.39 3.04 2.58 2.91 2.55 2.12 3.05 2.70 2.26 2.66 2.30 1.88 3.20 2.84 2.39 2.66 2.30 1.88 2.81 2.45 2.02 2.42 2.06 1.65 3.02 2.68 2.25 2.68 2.34 1.92 2.82 2.49 2.06 2.58 2.24 1.83 2.58 2.24 1.83 2.14 1.80 1.40 2.29 1.95 1.55 1.99 1.65 1.26 Fixed Window (1200 mm x 1500 mm) 1500 mm Glass Only 1200 mm Frame Width Aluminum without thermal break 33 mm Aluminum with thermal break 33 mm Aluminum without thermal break 46 mm Building Energy Performance – Spring 2012 - Topic 8 - Energy Flow through Building Envelope (Part 3) “Common Thermal Bridges” Some Details of Typical “Curtainwall” Construction University of Waterloo “Mathematics 3” “ Curtainwall” Construction “Vision” panel “Spandrel” panel (opaque) “Vision” panels “Spandrel” panels (opaque) Aluminum “Mullion” Photo from http://www.kawneer.com/ Anchoring to Supporting Steel (Plan View) Photo from http://www.architectureweek.com/ Vertical Mullion Anchoring to Concrete Floor Slab (Section View) Horizontal Mullion Photo from http://urbantoronto.ca Vertical Mullion “Curtainwall” system mounted outside of building structure Floor Slab Vertical Mullion Floor Slab Floor Slab Typical Vertical Mullion Profile at Vision Panel “Standard” “Improved Thermal Break” Aluminum Aluminum ≈ 6 mm separation between aluminum components ≈ 19 mm “thermal break” Vertical Mullion Profile at Vision Panel Thermal Break and Non-Metallic “Pressure Plate” “thermal break” thermally improved “pressure plate” Typical Horizontal Mullion Profile at Spandrel Panel insulation and metal “pan” Typical Ho...
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