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Energy Efficiency - Lunch & Learn
 

Energy Efficiency - Lunch & Learn

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The presentation addresses the thermal comfort requirements of the NSW Building Sustainability Index (BASIX) and how lightweight wood-based construction systems can be easily used to meet these ...

The presentation addresses the thermal comfort requirements of the NSW Building Sustainability Index (BASIX) and how lightweight wood-based construction systems can be easily used to meet these requirements. Emphasis is placed on simple techniques to insulate walls, roofs and sub-floor areas of suspended floors for new construction as well as alterations and additions. The presentation will highlight cost effective design and building details, ventilation issues and smart use of thermal mass.

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  • To operate properly, it requires:clear exposure to the sun on north facing windows for living rooms (attractive views in other directions may compete with this requirement or solar access may be restricted by vegetation or buildings)a site that allows for a long rectangular building on the East-West axis (to allow large north-facing façade & windows)householders who are prepared to leave living room (and other) windows ‘unscreened’ during winter days to allow sunlight penetration (this may conflict with privacy considerations, especially in denser developments)a construction method that allows for wall and ceiling insulation (it is difficult to place insulation in cavity brick walls
  • Lightweight timber framed construction is very cost effective. And it’s not just the timber industry saying that. This graph, in a report by Think Brick based on research by the University of Newcastle shows the cost of different external walling systems with the differences in annual energy consumption. The differences they found in this study, which we don’t agree with by the way, are very minor. However the differences in costs of construction are huge

Energy Efficiency - Lunch & Learn Energy Efficiency - Lunch & Learn Presentation Transcript

  • Wood and Energy Efficiency
    Lightweight Timber Framed Construction and NSW’s BASIX Thermal Comfort
  • Learn more about wood at UTAS
    Centre for Sustainable Architecture with Wood
    Graduate Certificate in Timber (Processing & Building)
    4 units, part time, online
    Areas covered include:
    Wood science
    Design for durability and service for life
    Timber as a renewable resource
    Sustainable design and construction
    Engineered wood products
    International technologies and developments
    Plus, selected topics of individual interest
    More information: Associate Professor Greg Nolan
    (03) 6324 4478 or enquiries@arch.utas.edu.auwww.csaw.utas.edu.au
  • Learning Objectives
    After this presentation you should be able to:
    Understand the thermal comfort methods of BASIX
    Understand the thermal properties of wood
    Understand how wood products can meet BASIXs thermal comfort requirements
    For architects - AACA Competencies:
    Design
    Documentation
  • This Presentation
    Thermal comfort requirements of BASIX
    How wood-based construction systems can meet these requirements
    Simple techniques to insulate:
    walls, roofs
    sub-floor
    Ventilation issues
    Smart use of thermal mass
  • BASIX - Thermal Comfort Requirements
    Methods:
    Simulation (AccuRate, BERSPro, Firstrate5)
    Whole house must not exceed maximum (separate) heating and cooling loads
    Deemed-to-satisfy
    DIY
    Rapid – simple single storey detached dwellings
    All methods require some form of additional insulation
  • Thermal Properties of Wood
    1calculated based on values and method provided in BCA 2010 Volume One Specification J1.2 Table 2a.
  • R-values for Timber Framed Elements
  • Roof
    Insulation is required in all climate zones in NSW
  • Walls
    Insulation is required in all climate zones in NSW
  • Floors
    Increase in floor system R-value required in most climate zones in NSW
    Additional insulation required in Rapid Method
  • Floors: BASIX requirements
  • Floors: Increase system’s R-value
    Additional insulation techniques:
    Insulate above the floor (e.g. carpet)
    Enclose sub-floor perimeter wall
    Decrease air-flow:
    Cover ground with plastic / halves ventilation
    Install cavity barrier into external wall cavity
    Insulate under floor:
    Insulate sub-floor perimeter wall
    Insulate directly under floor
  • Sub-floor: Enclose sub-floor perimeter
  • Floors: Enclose sub-floor perimeter
    Increase R-value of perimeter enclosure - depends on height of floor above ground
    Can increase system R-value by R1.0
  • Floor: Decrease sub-floor air flow
    Decrease air flow
    Cover ground with plastic
    Reduced ventilation requirements
    Source: BCA 2010 Volume Two Figure 3.4.1.2
  • Floor: Cavity barrier
    Increases R-value of floor by at least R0.5
  • Floor: Insulation below the floor
    Additional insulation below ground floor:
    Insulate inside of sub-floor perimeter wall
    May be cheaper
    Thermal connection maintained with ground (better for hot conditions)
    Insulate under the floor
    Foil integrated with flooring (e.g. R-Flor – no gluing issues)
    Under floor joists with plywood, foil etc
    Bulk insulation
  • High Mass House
    Solar Mass House
  • Energy Efficient Housing
    High mass house
    Main features and limitations
    Pending research
    Lightweight house
    Main features and benefits
    Hybrid and combination houses
  • High Mass House: Main features
    Main design features:
    Zoned design with living rooms to the north and bedrooms to the south. Main heating in living areas
    A length-to-width ratio of approximately 1 to 1.5 on the E-W axis
    Cavity/solid brick and slab-on-ground construction
    Ceiling and walls may be insulated (recommended values vary with climate)
  • High Mass House: Main features
    Main design features:
    North facing windows, sometimes with a recommended area as a function of floor area
    No, or minimum glass facing east and west
    Shading devices to windows during summer
    e.g. eaves projection, deciduous trees for north facing windows
    shutters etc. for east and west facing windows
  • High Mass House
    To operate properly requires:
    Clear exposure to north facing sun
    Site that allows for building on East-West axis
    Living room (and other) windows ‘unscreened’ during winter days to allow sunlight penetration
    Construction method that allows for wall and ceiling insulation
  • Thermal Mass
    How much mass is required?
    Suggested that 1,200 kg of thermal mass per m2 will produce a zero heating house in cold European climates (Vale and Vale 2000)
    Southwell, UK – 723 kg/m2 sufficient (Vale)
    Bairnsdale, AUS – 580 kg/m2 sufficient (Oppenheim)
    More theoretical work needs to be undertaken for temperate climates
  • Thermal Mass
    Suitable when:
    Climate is suitable
    Diurnal range > 8 degrees
    Site is suitable
    Allotment is oriented and sized adequately
  • Wood and Energy Efficiency – Lightweight Construction © FWPA 2011
  • Diurnal Range
    Source: Your Home Technical Manual
  • Lightweight House
  • Lightweight House
    Structural framework supports the building
    Other materials provide spatial separation and infill
    Great flexibility
    Providing excellent operational environmental performance
  • Lightweight Timber: Benefits
    Less sensitive to orientation and solar access
    Northern orientation is not critical
    Provides much more flexibility for sighting on a block
    Greater flexibility in design, layout and internal zoning
    Adaptable over time
  • Lightweight Timber: Benefits
    Reduced capital costs compared with mass house
    Ease of construction – no cut and fill on sloping blocks, easy installation of insulation in walls and ceiling.
    Reduced carbon footprint through whole life
  • Lightweight Timber: Cost effective
    $20,0000
    100 kWh/pa
    Source: Think Brick (2009) Wasting Energy. Available at http://www.thinkbrick.com.au/assets/documents/position_papers/PP2-Wasting-Energy.pdf
  • Lightweight Timber: Cost effective and energy efficient
    Largest difference is 100 kwHper annum to heat/cool
    Extra cost ~ $20 per year
    Compare cost of construction:
    insulated double brick $52,000
    insulated timber $32,000
    saving $20,000
    House life >1,000 years to pay for the difference
    Enough to buy a big solar power system and make house greenhouse neutral
    Calculations don’t include the greenhouse gases emitted in brick production or absorbed during tree growth
  • Lightweight Timber: Lower carbon footprint
    Total GHG emissions - 5 star
  • Lightweight Timber & Thermal Mass
    The difference in thermal mass between standard new build masonry and insulated lightweight timber frame construction is not a significant factor affecting either thermal comfort or energy consumption, now or within the lifetime of the building.
  • Lightweight Timber: Lower carbon footprint
    GHG emissions reductions using timber
  • Wood is an insulator
    Thermal image
  • Hybrid house
    The heavy mass and lightweight house hybrid:
    It’s not always a simple decision of either/or!
    If site allows access to some northern sun, mass can be incorporated in specific locations to use the solar heat in wintere.g. composite concrete/timber with lightweight timber-frame walls
  • Composite concrete/timber floor
    Tim Gibney and Associates :: Office Development – Surrey HillsImage 5 of 10
  • Combination Lightweight House
    +
  • Learn more about wood at UTAS
    Centre for Sustainable Architecture with Wood
    Graduate Certificate in Timber (Processing & Building)
    4 units, part time, online
    Areas covered include:
    Wood science
    Design for durability and service for life
    Timber as a renewable resource
    Sustainable design and construction
    Engineered wood products
    International technologies and developments
    Plus, selected topics of individual interest
    More information: Associate Professor Greg Nolan
    (03) 6324 4478 or enquiries@arch.utas.edu.auwww.csaw.utas.edu.au
  • More Information