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Tain tmin u shgc resistance network complex coupled

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Unformatted text preview: Simulation J.L. Wright Professor Department of Mechanical and Mechatronics Engineering University of Waterloo, Waterloo, Ontario, Canada AGSL Advanced Glazing System Laboratory www.solarme.uwaterloo.ca Green Building Design Reduce loads first, insulate well Building overheats easily Solar large/variable heat gain (minute, hour, day/night, season, etc.) Shading models are of critical importance control heat gain and glare dynamic control offers great potential "Mechachromic" control High Solar Transmission Glazing Low Solar Transmission Glazing Shaded Fenestration – complex, coupled Tm,out Ta,out Radiant Convective split = ? Ta,in Tm,in U=? SHGC = ? Resistance Network – complex, coupled Tm,in Tm,out Ta,out Ta,in New Theory U Si Tm,out Tm,in Ti Ta,out SHGC Fr,in Fr,out Tj Ta,in Building Simulation Needs Speed Many time steps Many windows Iterative solvers CPU time must be used sparingly for a detailed window analysis to be practical The new network theory delivers speed and stability Recent Progress New research – more data available New models and theory for example, from ASHRAE 1311RP … Venetian Blinds Slat0Shade between Panes neoprene glass Sub Sub Cavity 23 J3 Cavity 12 T2 Jf,2 Jb,2 J1 τ2 ρ3 ρf,2 ʹȃ qʹȃ23 ρb,2 φ w s ρ1 ʹȃʹȃ q12 guarded heater plate measurements rc Tcold T3 L T1 Thot 3.5 GHP Measurements (Huang et al. 2006) Open Symbols: one low0e coating, right scale Solid Symbols: uncoated glass, left scale Dashed Lines: Δ Tbath =20°C Solid Lines: Δ Tbath =10°C U0factor The Result (W/m2K) 3.5 3 U0factor (W/m2K) 3 2.5 2 2.5 2 1.5 Legend clr/clr, L=17.78 mm clr/clr, L=25.4 mm clr/clr, L=40.0 mm clr/low0e, L=17.78 mm clr/low0e, L=25.40 mm clr/low0e, L=40 mm 90 60 30 0 30 S lat An gle, φ (degrees) 2.5 2 1.5 U0factor (W/m2K) 1 0.5 60 0 90 1 L=17.78 mm Measurement (Huang 2005) 0 symbols Simulation (N=0.7) 0 lines clear/clear, upper set clear/low0e coating, lower set solid Lines/closed symbols: ΔTbath =10°C dashed Lines/open symbols: Δ Tbath =20°C 0.5 0 90 60 30 0 30 S lat An gle, φ (degrees) 60 90 Characterization of Drapery Fabric OffNormal Solar Property Measurement New Technique 0.5 Fabrics D D Model ID IID IM IIM IIIM Sheer IL IIL IIIL 0.5 0 M M 0 0.5 0.5 0 0.5 0.5 L 0 L Model ID IID IM IIM IIIM Sheer IL IIL IIIL 0 0 0 15 30 45 60 75 90 0 15 Incidence angle,θ 30 45 60 D III Model IIIL IIIM IIL IIM IID IL IM Sheer ID 0.5 0.5 0.5 0 0.5 0.5 L 0 I Model IID ID IM IIM IIIM IIL Sheer IL IIIL 0 M II 0 90 Incidence angle,θ θ 0.5 75 0 0 0 15 30 45 60 Incidence angle,θ 75 90 0 15 30 45 60 Incidence angle,θ 75 90 ρf,bd τf,bd τf,bb ρf,dd τf,dd Pleated Drapes 0.6 0.4 0.4 IL IL 0.6 0 0.6 0.4 0.4 IM 0.2 0 0.6 IM 0.2 0 0.6 0.4 0.4 ID 0.2 0 0.6 ID 0.2 0.2 0.2 0 0 1 2 3 4 5 0 IIL IIL 0.4 0.4 IIM IIM 0 0.6 0.2 0.2 0 0.6 0.4 0.4 IID IID 0 0.6 0.2 0 1 2 3 4 5 IIIL IIIL 0.6 0.4 0.2 0.4 0.2 0 0.6 IIIM IIIM 0 0.6 0.4 0.2 0.4 0.2 0 0.6 IIID 0 0.6 IIID 0.2 0 0.6 w 10 20 30 40 50 60 70 80 90 0.2 0 0.6 s 0 0.4 0.2 Ωh 10 20 30 40 50 60 70 80 90 0.6 0.4 10 20 30 40 50 60 70 80 90 0 0.6 0.4 0.2 0 0.4 0.2 0 1 2 3 4 Folding ratio, Fr 5 Horizontal profile angle, ΩH 0.5 Open weave5% Closed weave Roller Blinds Model Glacier Chalk_5% Ebony_5% White_14% Black_14% 0.5 0 0.5 Open weave14% Open weave14% Open weave5% 0 Model Chalk_5% Ebony_5% White_14% Black_14% 0 0.5 0.5 0 0 0 15 30 45 60 75 0 90 15 30 Closed weave Model Glacier Chalk_5% Ebony_5% White_14% Black_14% 0.5 Open weave14% Open weave5% 0 0.5 0 0.5 0 0 60 Incidence angle, θ Incidence angle, θ θ 45 15 30 45 60 Incidence angle, θ 75 90 75 90 0 0.5 0 0 0 15 30 45 60 Incidence angle, θ 75 90 0.5 0 0 15 30 45 60 75 90 0.5 0.5 0 ρbt 0.5 0.5 0 τbd τbt 0 Model 150 mesh 0.0026in dia SS 120 mesh 0.0026in dia SS 20 mesh 0.016in dia SS 60 mesh 0.0045in dia SS 20 mesh 0.01in dia bluegray 26 mesh 0.006in dia charcoal 0 ρbt 0.5 0.5 0 τbd 0.5 τbt τbb 0 Model 120 mesh 0.0026in dia SS 150 mesh 0.0026in dia SS 20 mesh 0.01in dia bluegray 20 mesh 0.016in dia SS 26 mesh 0.006in dia charcoal 60 mesh 0.0045in dia SS ρbt 0.5 0 τbb Model 120 mesh 0.0026in dia SS 150 mesh 0.0026in dia SS 20 mesh 0.01in dia bluegray 20 mesh 0.016in dia SS 26 mesh 0.006in dia charcoal 60 mesh 0.0045in dia SS τbd 0.5 τbt τbb Insect Screens Model 120 mesh 0.0026in dia SS 150 mesh 0.0026in dia SS 20 mesh 0.01in dia bluegray 20 mesh 0.016in dia SS 26 mesh 0.006in dia charcoal 60 mesh 0.0045in dia SS 0.5 0 0 15 Incidence angle, θ 30 45 60 75 90 0 15 Incidence angle, θ 30 1 τbt_expt 0.9 s τbt_model τbb_expt Solar optical properties 0.8 θ τbb_model 0.7 ρbt_model ρbt_expt τbd_expt τbd_model 0.6 0.5 0.4 0.3 d 0.2 0.1 0 0 15 30 45 45 60 Incidence angle, θ 60 Incidence angle, θ 75 90 75 90 HotBox/Solar Testing Solar Transmission ASHWAT versus Measurment Solar Transmission (ASHWAT calculated) 1 insect screen outdoor side CDG white venetian blind fully open 0.8 ± 0.05 white venetian blind closed 0.6 white venetian blind slat angle 60 deg. 0.4 white venetian blind slat angle = 30 deg. beige d...
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This note was uploaded on 10/04/2012 for the course ME 760 taught by Professor Davidmather during the Spring '12 term at Waterloo.

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