IGBC/BEX Presentation
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Façades in South-East Asia are well understood using typical performance metrics such as ETTV. Using the centre of pane performance values of shading coefficients (SC) and U-values, we can get a feel for the performance of façades but can these truly be determined as high performance if the conductive elements (thermal bridging) of framing and shading details are ignored? This presentation aims to illustrate the case for higher performing façade systems and hopes to be of value for those looking to fully integrate the design of such systems in South-East Asian commercial buildings. It is also aimed at those looking to understand façade framing performance and testing, to gain a greater knowledge of façade detailing and performance.
IGBC/BEX Presentation
- 1. www.inhabitgroup.com Are We Ignoring True Façade Performance In Singapore?
- 5. BUILDING PHYSICS/ SUSTAINABLE DESIGN TEAM JESSICA HOGG Associate GEORGE COUTTS Senior Building Physics/ Mechanical Services Engineer James Von Dinklage Building Physics Engineer SAMANTHA ANDERSON Senior Building Physics/ Renewable Energy Engineer SOPHIA KEE Senior Sustainable Design Consultant DAVID CARROL Building Physics Engineer/ Software Developer DARREN O’DEA Principal DENNIS CHANG Building Physics/ Façade Engineer
- 6. Shading Optimisation Rating Tools (Green Mark, LEED, Green Star, etc) Condensation Risk Energy Modelling Daylight Design Visual and Thermal Comfort Thermal Fracture Thermal Performance Passive House Wind Studies SENSE - BUILDING PHYSICS + SUSTAINABLE DESIGN SERVICES
- 7. Shading Optimisation Rating Tools (Green Mark, LEED, Green Star, etc) Condensation Risk Energy Modelling Daylight Design Visual and Thermal Comfort Thermal Fracture Thermal Performance Passive House Wind Studies SENSE - BUILDING PHYSICS + SUSTAINABLE DESIGN SERVICES
- 9. ETTV = 12(1 WWR) Uw + 3.4(WWR) Uf + 211(WWR) (CF) (SC) ETTV : envelope thermal transfer value (W/m2 ) WWR : window-to-wall ratio (fenestration area / gross area of exterior wall) Uw : thermal transmittance of opaque wall (W/m2.K) Uf : thermal transmittance of fenestration (W/m2.K) CF : correction factor for solar heat gain through fenestration SC : shading coefficients of fenestration
- 13. + + Aluminium 205 - 250 W/m K Steel 46 - 50 W/m K Glass 0.8 - 1 W/m K
- 16. Assumptions: 75% glazing, 0.25 Shading Coefficient, 1.9 W/m²K Vision U-value, 0.7 W/m²K Spandrel U-value
- 18. UgAg + UgsAgs + UfAf + UedgeAedge Usystem
- 21. TRANSOM DETAIL UF 15.7W/m²K UE 2.5 W/m²K NFRC 100 Ext Summer Conditions: . Air: 32.0 °C . Direct solar: 783 W/m² . Wind Speed: 2.75 m/s NFRC 100 Int Summer Conditions: . Air: 24.0 °C
- 22. TRANSOM DETAIL UF 13.6 W/m²K UE 2.1°Â/³¾Â²°
- 23. VISION MULLION DETAIL UF 16 W/m²K UE 2.5 W/m²K
- 24. MULLION SPAN DETAIL UF 6.0 W/m²K UE 2.0 W/m²K
- 25. USG 0.7 W/m²K UG 1.9 W/m²K UF 6.0 W/m²K UE 2.0 W/m²K UF 13.6 W/m²K UE 2.1 W/m²K UF 16 W/m²K UE 2.5 W/m²K UF 15.7 W/m²K UE 2.5 W/m²K
- 26. Edge Losses Frame Losses Centre Pane Losses 3.4 W/m²K 3.3 W/m²K VISION (U1.9) SPANDREL (U0.7) 0 50 100 150 200 250 300 Center System Center System Glass Spandrel HeatTransmission(kWh/annum)
- 27. WITHOUT FRAMES INCLUDING FRAMES
- 28. • A high performance façade design is meaningless without inclusion of the frame • Thermally improving your façade is not only a cold climate strategy • Request further guidance from the BCA • Access ETTV Façade Designer for free on the Inhabit Website
- 29. HIGH PERFORMANCE FACADES FOR THE TROPICS – THE NEXT DECADE Level 3, Begonia 3001A – 3102
- 30. FAÇADE | ADVANCED STRUCTURES | BOUTIQUE FAÇADES & STRUCTURES | ESD | BUILDING PHYSICS | ACOUTICS | LIGHTING | ACCESS & MAINTENANCE | LOGISTICS
Editor's Notes
- #19: Area-weighted average across the system Similar process with SHGCs