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Green Buildings Roof design approach
 

Green Buildings Roof design approach

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    Green Buildings Roof design approach Green Buildings Roof design approach Presentation Transcript

    • Developing Energy Efficient Building Envelope (Roof) Abdulkader Bengali, Head–Sales & Marketing, Indian Sub Continent THE PINK PANTHER™ & © 1964 – 2009 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. © 2009 Owens Corning.
    • Agenda • Why Insulation ??? • Energy Conservation Building Code • Insulation – Energy Conservation Building Code – Selection Criteria – Insulation Material – Comparison • Roof System • Wall System
    • Why Insulation ??? THE PINK PANTHER™ & © 1964 – 2009 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. © 2009 Owens Corning.
    • Where Energy goes from a house… Energy Costs are going through the roof, walls and windows
    • Energy Demand – Roof & Wall Need for High Efficient, Insulated Building Envelope
    • The Most Cost-effective Method for Decreasing Greenhouse Gas Emissions Building Insulation Curbing Global Energy Demand Growth: The Energy Productivity Opportunity Diana Farrell, McKinsey Global Institute May 2007
    • Energy Conservation Building Code (ECBC) THE PINK PANTHER™ & © 1964 – 2009 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. © 2009 Owens Corning.
    • Energy Conservation Building Code • Prescriptive Method • Trade Off Method • Whole Building Performance Method Envelope Performance Factor (EPF)
    • Insulation – Selection Criteria & Comparison THE PINK PANTHER™ & © 1964 – 2009 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. © 2009 Owens Corning.
    • U Value • Amount heat transmitted in – unit time – through unit area of a material or construction and the boundary air films, – induced by unit temperature difference between the environments on each side. – Units of U are W/m2-ºC (Btu/h-ft2-°F) – U = k/t (k = thermal conductivity of material & t = thickness) Area = 1 m2 T1 = 1oC U = 13 W/sqm K (6” RCC Slab) T2 = 0oC
    • R Value – Thermal resistance • The reciprocal of the time rate of heat flow – through a unit area – induced by a unit temperature difference between two defined surfaces of material or construction – Units of R are m2-°C/W (h-ft2-°F/Btu). – R = 1/U = t/k (k = thermal conductivity of material & t = thickness)
    • Selection Criteria – Insulation System for Concrete Building Envelope • Thermal Performance – Selection – Thermal Resistance (R-Value) – not on density & thickness – Eliminates or minimizes thermal bridging – Ideal Location – Durable (weather-ability) • Functional – Absorbs minimum moisture – Should not be exposed to fire risks – Safe & Durable (aging and functional use)
    • Cell Structure – Insulation Material Foamular Metric eXtruded PolyStyrene (XPS) PolyUrethane Foam (PUF) Expanded PolyStyrene (EPS)
    • Product Comparison–Moisture Absorption • Insulation should absorb minimum moisture for best thermal performance – Very low water absorption per ASTM C578 standard Property XPSa EPSa SPUb Water Absorption, Vol. % < 0.3c 2.0 - 4.0c 5.0d Water Vapor Permeance perm 1.1e 2.0 - 5.0e 2.5 - 3.0e ng/Pa.s.m2 63 115 - 287 144 - 176 Thermal Resistance °F.ft2.h/btu 5.0 3.1 - 4.2 6.2 Km2/W 0.88 0.55 - 0.74 1.10 XPS – Extruded Polystyrene ; EPS – Expanded Polystyrene ; SPU – Sprayed Polyurethane Notes : a. Data from ASTM C-578 ; b. Data from ASTM C-1029; c. Tested 24 hr ; d. Tested 96 hr ; e. Desiccant Method
    • Product Comparison – R Value retention CRREL : 80% Minimum Acceptable • Moisture content affects thermal resistance – Select an insulation product ( for building envelope ) which retains its thermal resistance – R Value Retain R Value v/s Exposure to time @ 70% RH XPS New Wetting Curves for Common Roof Insulations, U.S. Army Corps of Engineers Cold Regions Research and Engineering Laboratory (CRREL) April 1991
    • Prescriptive Method - Roof THE PINK PANTHER™ & © 1964 – 2009 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. © 2009 Owens Corning.
    • Roof Assembly: Insulation Requirements As per Energy Conservation Building Code (ECBC) 2007
    • Insulation Material – Comparison 98 XPS = 116PUF = 175EPS = 420Bead Mortar=770 AAC = 2345 Clay Brick R= 3.5 (m2· K/W) = 19.9 (F· ft2· h/Btu) XPS = Extruded Polystyrene; PUF = Polyurethane Foam; EPS = Expanded Polystyrene; AAC = Aerated Autoclave Concrete
    • Roof Insulation - System THE PINK PANTHER™ & © 1964 – 2009 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. © 2009 Owens Corning.
    • Roof Assembly: Insulation Requirements As per Energy Conservation Building Code (ECBC) 2007
    • Roof System – U Values Chemical Waterproofing Chemical Layer Cement Screed Waterproofing Layer Brick Batt Coba 150 75 75 25 200 200 RCC RCC Slab Slab U Value : 3.19 W/m2.K U Value : 2.61 W/m2.K U Value for 24 hour use : 0.261 W/m2.K As per ECBC U Value for daytime use : 0.409 W/m2.K Geo Textile Tile Screed Water Proofing Layer Extruded Polystyrene Insulation Screed U Value: 0.237 W/m2.K RCC Slab A layer of Insulation reduces U value by >10 times
    • Roof System Screed Pebbles / Gravels Tile Protective Membrane Pavers (Geo Textile) Water Proofing Extruded Polystyrene Layer Insulation Material Screed Mortar Concrete Slab
    • PRMA System – Types
    • Long Lasting Durability – Dallas Forth Worth International Airport Project Highlights – PRMA System • 3,036 squares re-roofed • 88% of existing insulation reused • $180,000 saved in new material cost • $15,000 saved in hauling/landfill • $100,000 saved in labor costs Environmental Benefits • Usable insulation recycled • New product resource consumption minimized • Saving in Fossil fuels • Recycled insulation continues to save energy
    • Prescriptive Method - Wall THE PINK PANTHER™ & © 1964 – 2009 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. © 2009 Owens Corning.
    • Wall Assembly: Insulation Requirements As per Energy Conservation Building Code (ECBC) 2007
    • U VALUE COMPARISON – WALL SYSTEM Single (Brick) Wall Single (Brick) Wall Double Wall (Brick) + ACP with air gap ACP 9” thick cement air plaster gap U value: ~1.78 U value: ~1.40 U value: ~0.93 insulation on external fascade U value: ~0.39 U value: ~0.40 U value: ~0.37 Single (Brick) Wall + Double Wall + air gap + Brick Wall + ACP 50mm Insulation 50mm insulation + 50mm Insulation Source: Owens Corning Unit in W/m2.K
    • Wall Solutions - External Insulation (Wet Cladding – Paint )
    • Wall Solutions - External Insulation (Wet Cladding – Tile ) Hangzhou Palm Bay
    • Wall Solutions - External Insulation (Dry Cladding – ACP / Stone) Metal Finish Beijing Orient Plaza Stone Finish
    • Wall Solutions - Internal Insulation (Dry & Wet)
    • Thank You abdulkader.bengali@owenscorning.com (+91- 9819987696) THE PINK PANTHER™ & © 1964 – 2009 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. © 2009 Owens Corning.