developing energy efficient building envelope (concrete)
TRANSCRIPT
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.
Developing
Energy
Efficient
Building
Envelope
(Roof)
Abdulkader Bengali, Head–Sales & Marketing, Indian Sub Continent
Agenda
• Why Insulation ???
• Energy Conservation Building Code
• Insulation
– Energy Conservation Building Code
– Selection Criteria
– Insulation Material – Comparison
• Roof System
• Wall 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.
Why Insulation ???
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
Curbing Global Energy Demand Growth: The Energy Productivity Opportunity Diana Farrell, McKinsey Global Institute May 2007
BuildingInsulation
The Most Cost-effective Method for Decreasing Greenhouse Gas Emissions
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
(ECBC)
Energy Conservation Building Code
• Prescriptive Method
• Trade Off Method
• Whole Building Performance Method
Envelope Performance Factor (EPF)
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.
Insulation – Selection Criteria &
Comparison
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
T2 = 0oC
U = 13 W/sqm K (6” RCC Slab)
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)
Expanded PolyStyrene
(EPS)
PolyUrethane
Foam (PUF)
Property XPSa EPSa SPUb
Water Absorption, Vol. %< 0.3c 2.0 - 4.0c 5.0d
Water Vapor Permeanceperm 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
Product Comparison–Moisture
Absorption
• Insulation should absorb minimum moisture for best thermal performance
– Very low water absorption per ASTM C578 standard
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
XPS
Retain R
Value v/s
Exposure
to time @
70% RH
New Wetting Curves for Common Roof Insulations, U.S. Army Corps of Engineers
Cold Regions Research and Engineering Laboratory (CRREL) April 1991
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.
Prescriptive Method - Roof
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
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 Insulation - System
Roof Assembly: Insulation
Requirements
As per Energy Conservation Building Code (ECBC) 2007
Roof System – U Values
U Value : 3.19 W/m2.K
Brick Batt Coba
200
15
0
75
Chemical
Waterproofing Layer
RCC
Slab
U Value : 2.61 W/m2.K
U Value for 24 hour use : 0.261 W/m2.K
U Value for daytime use : 0.409 W/m2.K
Cement Screed
RCC
Slab
200
75
25
Chemical Waterproofing
Layer
U Value: 0.237 W/m2.K
A layer of Insulation reduces U value by >10 times
Water Proofing
LayerExtruded Polystyrene Insulation
Geo Textile
Screed
RCC Slab
Screed
Tile
As per ECBC
Water Proofing
LayerExtruded Polystyrene
Insulation Material
Protective Membrane
(Geo Textile)Pavers
Pebbles /
Gravels
Roof System
Concrete
Slab
Screed Mortar
TileScreed
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
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.
Prescriptive Method - Wall
Wall Assembly: Insulation
Requirements
As per Energy Conservation Building Code (ECBC) 2007
U VALUE COMPARISON – WALL SYSTEM
Source: Owens Corning
Double Wall (Brick)
with air gap
air
gap
U value: ~0.93
Double Wall + air gap +
50mm insulation
U value: ~0.37
Single (Brick) Wall
+ ACP
U value: ~1.40
ACP
U value: ~0.40
Brick Wall + ACP
+ 50mm
Insulation
insulation on
external
fascade
U value: ~0.39
Single (Brick) Wall +
50mm Insulation
Single (Brick) Wall
U value: ~1.78
cement
plaster
9”
thick
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
Stone Finish
Beijing Orient Plaza
Wall Solutions - Internal Insulation
(Dry & Wet)
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.
Thank You
[email protected] (+91- 9819987696)