Curtainwalls. Brussels Window. Objectives. Windows & Curtainwalls. Curtainwalls. 1 R2 R3. High tech? Low tech?
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1 Curtainwalls Windows have long been important to buildings Brussels Window Objectives Windows & Curtainwalls This talk aims to Develop awareness of curtainwall performance appreciate impact of performance on bldg differentiate between window features understand variables in selection A major element in modern architecture Must apply the usual building enclosure design principles Support, Control, Finish, Distribute Must also consider Control of solar radiation and light Allowance for ventilation Curtainwalls R2 R3 Functions: Same as wall plus transparent and allow ventilation not easy= hence expensive + compromise Structure - transfer loads Rain control Heat control Airflow control tight / ventilation Solar control gain / reject High tech? R4 Low tech? 1
2 Getting good R6 R24 R8 Comfort Why Good Curtainwalls? Warmer windows = more comfort! Major impact on energy performance, e.g. HVAC equip condensation resistance comfort (warm, no drafts view and light rain penetration resistance sound control (air and mass) Curtainwalls Similar principles as windows Increased lateral structural loads Larger units means more movement Different joints Metal Back Pan Insulation 2.50 Vertical mullion 3.95 Thermal Break Neoprene Gasket Pressure Plate 2.50 Opaque Spandrel panel 2
3 Types Anatomy of a Curtain Wall (Typical Mullion) Glazing unit Pressure plate Snap cap (finish) Inner Gasket (airseal) Thermal break Drainage space Outer Gasket (rainscreen) Anatomy of an IGU IGU = Insulated Glazing Unit = Glazing + Spacer & Seal + Fill Functions Performance Metrics Performance Metrics Controlling Heat Heat Flow (R,U) Condensation resistance (CRI) Solar Heat Gain Coefficient (SHGC) Visual Transmittance (VT) Air Leakage (AL) Water penetration Windows and curtainwalls usually have the lowest thermal performance of all parts of the enclosure Must control heat for Comfort Energy Health Durability Prevent Condensation 3
4 Controlling Heat Heat Flow Available: krypton gas fill quad glazing (to R7) super spacers U= W/mK RSI = R= Thermal break -a must Frame Center of Glass Edge of Glass Glazing System U-value IGU Low-e Coatings Simple tabulated values Center of glass quoted Edges matter! Low-e coatings reduce the amount of heat transferred by radiation Common Coating Uncoated Glass Low-e 0.2 Low-e 0.1 Low-e 0.04 Emissivity Radiation Reduction - 75% 90% 95% Gas Fills Gas fills reduce the amount of heat transferred by conduction and convection through the space in the glazing unit Fill Air Argon Krypton Xenon Conductivity (W/mK) Reduction in Conductive Transfer - 33% 64% 79% Double Glazing center of glass No coatings e=0.03 avail. commercially R2 R3 R4 4
5 Warm-edge / super spacers No coatings Triple Glazing center of glass R3 R4 R5 R7 e=0.03 avail. commercially Heat flow through spacers is important Critical for condensation control Super spaces Plastic/foam edges seals stainless steel, very thin Dramatically reduce cool glazing edges PTB Mullions = heat loss 8 Controlling Heat R1.5 R2 R3 Design Space Heating Load (W/m 2 ) Uglaz=2.0 Design Heating Load based on outdoor temperature of -20 C, and average of 10 m distance from enclosure to center of building Uglaz=1.3 Uglaz=0.8 1/4 Lighting Load Power Level Better enclosures allow one to avoid need for perimeter heating Kawneer isoport % 25% 50% 75% 100% Percentage of Vertical Enclosure that is Glazing 5
6 Controlling Sun Solar Heat Gain Coefficient Balance between Controlling solar heat gain (SHGC) Controlling light transmission (VT) SHGC = Solar Heat Gain Coefficient = Fraction of solar radiation that passes Typical clear, dbl-glazed window SGHC = 0.72 Higher SHGC? Maybe small residential buildings in heating climate Low SHGC? Commercial buildings Buildings with large glazing ratios (large window/wall) Buildings in cooling or mixed climate Visible Transmittance Solar Gains - July N VT = Visible Transmittance = Fraction of visible light that passes Typical clear, dbl-glazed window VT = Windows with VT > are perceived to be clear Tinting changes the color of light that passes low-e coating does not change color Solar Gain (W/m2) North Wall East Wall South Wall West Wall Roof Spectrally selective has lower SHGC with good VT Hour of the Day Solar Gains - Jan 45 N Shade West Wall 600 Roof 500 Mother 400 Nature is try to tell you something Solar Gain (W/m2) 900 North Wall 800 East Wall 700 South Wall Hour of the Day 6
7 Shades & high performance Interior Shade High performance glazing reduces efficacy of interior shades Increases performance of exterior shading Exterior Shade Body tints Reduce VT and SHGC Spectrally Selective Magic Reduced SHGC with a high VT Allows daylighting and view with low solar heat gain Tend to have good U-values Great choice for west/east view windows All directions in large commercial buildings 7
8 Glazing Film on clear glass Green low-e Balancing SHGC & VT Reflective blue-green Green tinted, medium Sun-control low-e + green Super low-e + clear Super low-e + green VT SHGC Spectral Selectivity of Several Glazings LSG = Light to Solar Gain ratio = Tv/SHGC 0.00 LSG Effective SHGC Controlling Solar Radiation SHGCglaz=0.15 SHGCglaz=0.35 SHGCglaz=0.55 0% 25% 50% 75% 100% Ratio of Glazing Low SHGC and Reduced Glazing Ratio to reduce cooling load Controlling Rain Penetration Controlling Rain Penetration IGU is a perfect barrier Concentrates water What about the interfaces between IGU & Frame Frame and Other claddings Curtainwall and parapets and grade Curtain leak internally (esp. at corners) they leak at the interface with the wall Therefore Design and install using the drained approach 8
9 Controlling Rain Controlling Air Leakage Horizontal mullion Drain hole Drain hole Drainage Rain shedding Insulation Opaque Spandrel panel Primary plane of airtightness Air Flow Control Terminations 9
10 Grade termination Allow for: 1. Movement 2. Construction tolerances Movements Performance Metrics Conclusions Heat Flow (R,U) Condensation resistance (CRI) Solar Heat Gain Coefficient (SHGC) Visual Transmittance (VT) Air Leakage (AL) Water penetration Understand importance of windows to building performance Balance U, SHGC, and VT Design and build draining frames, drained connections air barrier continuity with walls Curtainwalls - use less glass of better quality Websites University of Waterloo Building Engineering Group Balanced Solutions
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