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Roof-mounted PV in Cyclonic Areas

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  • Roof-mounted PV in

    Cyclonic Areas

  • Established in 2007 by Centre for Appropriate Technology (Indigenous Science and Technology organisation)

    Engineering consultancy specialising in project management and renewable energy systems

    Previous projects include Desert Knowledge Australia Solar Centre, Crowne Plaza PV system (304kWp), Alice Springs Airport (235kWp)

    Project managers for Bushlight India project adapting the Bushlight Australia program for an Indian context with pilot projects in Orissa and the Sunderbans (a cyclone prone area)

  • Bushlight Australia

    Close relationship with Bushlight, a Department of CAT

    a program installing stand alone PV systems in remote Indigenous communities across Australia

  • GeboowamaBaas Yard

    Kununurra Fitzroy Station

    MillibunthurraGoojarr GoonyoolJimbilum

    Sandridge

    Fish Hole Gulburang

    Dingo Spring Wandangula

    LingaraScrubby Bore Larinyuwar

    Gnylmarung

    TirralintjiKulumbulani

    JingalooCAIRNS

    Jabir JabirViolet Valley

    DERBY

    Communities with Bushlight RE Systems 2002 - 2011

    Communities where Bushlight has

    implemented its Community Energy

    Planning Model and established a

    Renewable Energy System. Paradise Farm

    Kapalga

    Galawdjapin Mata MataJi-Bena

    DARWIN

    Katherine

    Kabulwarnamyo Ji-Marda

    Ji-MalawaMurrungga

    Bawaka

    Gutjangan

    Gurrumuru

    Patonga Homestead

    Chile Creek

    Djugarargyn

    MungetMaddarr

    Nhulunbuy

    Emu Springs

    Mount Catt

    Balma

    Yedikba

    4 Mile

    Yanbakwa

    Mirrnatja

    Kulpa

    Chuula

    Coen

    Puntimu

    Theethinji

    Kewulyi

    Ganiyarrang Wumajbarr

    WuyagibaWanduWarpaant

    Wada Warra PenkelthenGlen Garland

    Broome

    Wanamulyandong

    Yandarina

    Jilayria

    Ngarantjadu

    Bedunburru Balginjirr

    Mt Anderson Fitzroy Crossing Kartang Rija

    Birri Williams

    Lametha

    Mingalkala

    Kurlku

    Lul-tjuBlue Bush Likkaparta

    Gunun Woonun

    Gubbangurru

    Barawoorooga NgapagunpaConnells Lagoon

    Kitty Well GunbahPitulki

    Mungalawarru

    Tennant Creek Kurraya

    Nguyarramini10 Mile

    Mount Isa

    Hatches Creek

    Mt Dennison

    Mt Theo Pulardi

    Petyale Angula

    Illya Pinu

    KarrinyarraAlyuen

    MulgaBore Urlampe

    Mt Eaglebeak

    Irrerlirre

    Warren Creek New Bore Corkwood Bore Panels Well

    Bushlight RE Systems Ulpanyali

    ALICE SPRINGS Ponya

    Undoolya Bore

    Snake Well

    Gillen Bore

    AlatyeyeWanmarra

    IpoleraMt Peachy

    Main roads Ukaka Arkanta #5 Bore

    John Holland North

    Spring Peak

    Patonga Airstrip Silver Plains

    Moojeeba

    Cyclone Monica

    17-25 April 2006

    Cyclone Monica

    17-25 April 2006

  • GeboowamaBaas Yard

    Kununurra Fitzroy Station

    MillibunthurraGoojarr GoonyoolJimbilum

    Sandridge

    Fish Hole Gulburang

    Dingo Spring Wandangula

    LingaraScrubby Bore Larinyuwar

    Gnylmarung

    TirralintjiKulumbulani

    JingalooCAIRNS

    Jabir JabirViolet Valley

    DERBY

    Communities with Bushlight RE Systems 2002 - 2011

    Communities where Bushlight has

    implemented its Community Energy

    Planning Model and established a

    Renewable Energy System. Paradise Farm

    Kapalga

    Galawdjapin Mata MataJi-Bena

    DARWIN

    Katherine

    Kabulwarnamyo Ji-Marda

    Ji-MalawaMurrungga

    Bawaka

    Gutjangan

    Gurrumuru

    Patonga Homestead

    Chile Creek

    Djugarargyn

    MungetMaddarr

    Nhulunbuy

    Emu Springs

    Mount Catt

    Balma

    Yedikba

    4 Mile

    Yanbakwa

    Mirrnatja

    Kulpa

    Chuula

    Coen

    Puntimu

    Theethinji

    Kewulyi

    Ganiyarrang Wumajbarr

    WuyagibaWanduWarpaant

    Wada Warra PenkelthenGlen Garland

    Broome

    Wanamulyandong

    Yandarina

    Jilayria

    Ngarantjadu

    Bedunburru Balginjirr

    Mt Anderson Fitzroy Crossing Kartang Rija

    Birri Williams

    Lametha

    Mingalkala

    Kurlku

    Lul-tjuBlue Bush Likkaparta

    Gunun Woonun

    Gubbangurru

    Barawoorooga NgapagunpaConnells Lagoon

    Kitty Well GunbahPitulki

    Mungalawarru

    Tennant Creek Kurraya

    Nguyarramini10 Mile

    Mount Isa

    Hatches Creek

    Mt Dennison

    Mt Theo Pulardi

    Petyale Angula

    Illya Pinu

    KarrinyarraAlyuen

    MulgaBore Urlampe

    Mt Eaglebeak

    Irrerlirre

    Warren Creek New Bore Corkwood Bore Panels Well

    Bushlight RE Systems Ulpanyali

    ALICE SPRINGS Ponya

    Undoolya Bore

    Snake Well

    Gillen Bore

    AlatyeyeWanmarra

    IpoleraMt Peachy

    Main roads Ukaka Arkanta #5 Bore

    John Holland North

    Spring Peak

    Patonga Airstrip Silver Plains

    Moojeeba

    Cyclone Ingrid

    6 -16 March 2005

    Cyclone Ingrid

    6 -16 March 2005

  • Characteristics of a Cyclone

  • Picnic Bay Surf Club,

    Magnetic Island,

    TownsvillePhotograph Courtesy, Ergon Energy

  • Legislative considerations for PV installations in

    cyclonic and non-cyclonic regions

    Design engineering considerations and

    explanation for wind loading on domestic housing

    and PV modules

    Practical considerations on the job

  • Extract from Building Code of AustraliaCurrent Mandatory Requirement

  • Extract Standards Australia AS1170.2 :2002

  • Extract Standards

    Australia AS1170.2 :2002

  • Basic Design Wind Pressure, p (kPa) = 0.6 x V2 x {other factors}

    where V wind speed in metres/sec

  • Terrain Category

    Shielding

    Topography

    Site Exposure considerations

    No

    Partial

    Full

  • Roof geometry

    Wind discontinuities

    Local pressure factors

    Edge conditions

    Special Features

    Structural considerations

  • Aerodynamic Shape& pressure coefficients

  • Additional Factors for Roofing

    components and PV roof mounted

    systems

    Table 3 Net pressures coefficients for PV panels based above pitched roofs

    Wind tunnel Full-scale BS6399-2 flat canopy roof data

    study study (1) (1) (1) Zone AbZone Bb Zone Cb

    Positive pressure +0.83(2) +0.97(2) +0.5 +1.8 +1.1

    Negative pressure -0.94(2) -0.73(2) -0.6/-1.3(3) -1.3/-1.8(3) -1.4/-2.2(3)

    1. Zone A is the central roof area, Zone B is the side edge areas (parallel to the wind),

    Zone C is the windward and leeward edge area.

    The width of the edge areas is taken as 10% of the largest plan dimension of the roof.

    1. These measurements were given as peak pressure coefficients; to be compatible with

    BS6399-2 they have been converted to mean pressure coefficients.

    2. The first value is for the case with the canopy fully open beneath; the second value is for

    the canopy fully blocked.

    Source: BRE Digest Wind Loads on roof-based photovoltaic systems Digest 489

    Extract Standards

    Australia AS1170.2 :2002

    Local Pressure Factors at Eaves, Ridges

    and Gable Ends

  • Before commencement

    During construction

    Upon completion

    Practical considerations

  • Before work commencement

    1. Check Design Documentation in accordance with BCA and Design Standards

    Assumptions in design documents accord with local conditions, design wind loads,

    terrain category

    Review any specific geometric design limitations, hip and minimum edge distances

    2. Inspect Building structure

    Record and photograph as built condition

    Determine any inconsistencies of the design layout with the building geometry

    Alert Engineer to any structural concerns you might have. Existing building and roof

    frame, roof cladding, fixings for corrosion, previous damage etc

    Practical design considerations

  • Practical design considerations

    During construction

    1. Record and photograph agreed system changes and deviations from the

    original design

    2. Fixings to building structure and Component connection eccentricities

    Ensure installation methodology is agreed and recorded with the Engineer

    Prevent bimetallic corrosion - Isolate dissimilar materials

    Refer any concerns and latent conditions with the Engineer. They have a duty of

    care to ensure any modifications to the existing building dont compromise its

    structural integrity

    3. Weatherproofness and securing of cabling and ducting

    Preven ion of future debris build up under modules

  • Practical considerations

    On Completion

    1. Check installation for compliance with Design documentation and agreed

    changes before Final Inspection.

    2. Record, photograph and sign off Snagging List

    3. Archive as-built construction documentation

  • Conclusion and Questions

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