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A combined heat and power solar concentrating collector Joe Coventry Centre for Sustainable Energy Systems Australian National University. The CHAPS collector. C ombined H eat A nd P ower S olar Collector

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A combined heat and power solar concentrating collector joe coventry

A combined heat and power solar concentrating collector

Joe Coventry

Centre for Sustainable Energy Systems

Australian National University


The chaps collector
The CHAPS collector

  • Combined Heat And Power Solar Collector

  • Generation of DC electricity AND Generation of hot water

  • Applications:

    • DHW, HHW and electricity

    • Commercial buildings

    • Light industrial buildings

    • Residential colleges

      (eg. Bruce Hall 300m2 system)


Chaps system components
CHAPS system components

  • CHAPS troughs

    • 24 m long x 1.6 m wide rows

    • 37x geometric concentration ratio

    • Modular system

  • Solar cells

    • 20% efficient under 30suns and 25°C

    • Low series resistance

    • Manufactured at ANU


Chaps system components1
CHAPS system components

Receivers

  • Aluminium extrusion

  • Series connected solar cells

  • Finned fluid conduit

  • Glasswool insulation

  • Anti-freeze, anti-corrosive heat transfer fluid

  • Assembled at ANU

  • Mirrors

    • Glass-on-metal laminate mirrors

    • Silver backed mirror

    • Stamped tab ribs

    • Manufactured at ANU


  • Efficiency tests
    Efficiency tests

    • Measured on a custom built outdoor test rig at ANU with:

      • 1.25 m wide trough

      • 27 solar cell receiver

      • Steady state conditions

      • Maximum power point electrical load

      • Range of input temperatures

      • Constant low flow conditions

    • Efficiency results include:

      • Losses due to receiver shading

      • Losses due to hydraulic connections



    Flux profile across a cell
    Flux profile across a cell

    • Illumination profile

      • measured using videographic flux mapping techniques

      • Peaks exceeding 100 suns

      • Significant temperature variation across cells


    Cells modules testing
    Cells & Modules – testing

    • Range of cell and module tests

      • UV testing

      • High temperature testing

      • Humidity testing

      • Thermal cycling

      • On sun!

    • Challenges

      • Differential expansion

      • Corrosion

      • Water ingress


    Receiver design
    Receiver design

    • Domestic system

      • Mechanical bond

      • Adhesives

      • Intermetalic bond

      • Electroplating

    • Commercial system

      • Closed circuit


    Attaching the cells
    Attaching the cells

    • Thermal tape

    • Alumina based substrates

    • Anodising

    • Plasma coating


    Interconnections
    Interconnections

    • Tabs

    • Tab connections

      • Braid

      • Shim

      • Spot welding


    Optical system
    Optical system

    • GOML mirror

    • Low iron glass

    • Silicone

    • Textured cells


    Conclusions
    Conclusions

    • Significant work on reliability, longevity

    • CHAPS systems beginning to be commercialised