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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. 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

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  1. A combined heat and power solar concentrating collector Joe Coventry Centre for Sustainable Energy Systems Australian National University

  2. 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)

  3. 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

  4. 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

  5. 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

  6. Efficiency Results

  7. Flux profile across a cell • Illumination profile • measured using videographic flux mapping techniques • Peaks exceeding 100 suns • Significant temperature variation across cells

  8. 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

  9. Receiver design • Domestic system • Mechanical bond • Adhesives • Intermetalic bond • Electroplating • Commercial system • Closed circuit

  10. Attaching the cells • Thermal tape • Alumina based substrates • Anodising • Plasma coating

  11. Interconnections • Tabs • Tab connections • Braid • Shim • Spot welding

  12. Optical system • GOML mirror • Low iron glass • Silicone • Textured cells

  13. Conclusions • Significant work on reliability, longevity • CHAPS systems beginning to be commercialised

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