1 / 20

Thermal Aspects of Photovoltaic/Thermal Solar Collectors

Thermal Aspects of Photovoltaic/Thermal Solar Collectors. Tim Anderson Deparment of Engineering University of Waikato. Solar Energy and NZ. New Zealand land mass conservatively collects 1.4x10 21 J per year

aleda
Download Presentation

Thermal Aspects of Photovoltaic/Thermal Solar Collectors

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Thermal Aspects ofPhotovoltaic/Thermal Solar Collectors Tim Anderson Deparment of Engineering University of Waikato

  2. Solar Energy and NZ • New Zealand land mass conservatively collects 1.4x1021 J per year • An average house rooftop of 150m2 collects 2.2x108 Wh per year ie. 20 to 30 times the house’s total requirements. • Hamilton receives ~5000 MJ/m2/year

  3. Solar Thermal Photovoltaics Existing Solar Technologies Source: www.solahart.com.au Source: www.bpsolar.com

  4. Solar Thermal + Photovoltaics = PVT What is a Photovoltaic/Thermal Solar Collector + =

  5. PVT Collectors • Photovoltaic and solar thermal in a single device: Cogeneration of heat and power • PV-cellefficiency decreases with increasing temperature • Efficiency of PV cells increased by active cooling • Area dedicated to solar energy devices can be reduced

  6. PV Module Air Insulation PVT Air Heating • Simple • Cheap • Cavity formed behind a PV panel • Provides reasonable air heating

  7. Cover PV Module Water Tube Insulation PVT Water Heating Systems • Could look very similar to a “standard” solar thermal collector • Simple • Typically better efficiencies than air heating • Suitable for heating over wide range of temperatures

  8. Market for PVT Systems • Solar thermal collector market in Australia and New Zealand was growing at a rate of 19% per annum • Market for photovoltaic solar collectors has experienced a very high rate of growth during the last decade • PVT systems could meet the entire European PV quota while also providing 30% of the solar thermal target • Largest market is the domestic sector • Short to medium term PVT will find “niche market” applications Source: International Energy Agency (Photovoltaic Power Systems Programme), 2005, Trends in Photovoltaic Applications - Survey report of selected IEA countries between 1992 and 2004, Report IEA-PVPS T1-14:2005

  9. University of Waikato PVT Research • University of Waikato is conducting research into Building Integrated Photovoltaic/Thermal (BIPVT) collectors • BIPVT is the use of PVT as building elements such as roofing or façade • Compromise between thermal, electrical and building needs • Thermal and electrical performance of a typical BIPVT collector has been modelled, using a modified Hottel-Whillier method (i.e. as a standard flat plate solar collector)

  10. BIPVT Implementation • Unglazed BIPVT • Glazed BIPVT • Standard roofing profile • Standard roofing materials

  11. BIPVT Unglazed

  12. BIPVT Cooling Passage Width

  13. BIPVT Flowrate

  14. BIPVT Material

  15. BIPVT Packing Factor

  16. BIPVT Cell to Absorber HTC

  17. BIPVT Transmittance-Absorptance Product

  18. BIPVT Insulation Thickness

  19. What does it all mean? • TMY can be used for long term simulation of solar energy devices such as PVT • PVT modelling used for design modifications – empirical validation in progress • Modelling shows that to improve the BIPVT collector we could: use less PV cells, try to improve PV cell optical efficiency, reduce insulation

  20. Where to from here? • Long term modelling of BIPVT • Empirical validation of design model • Develop correlation to predict heat loss from BIPVT due to natural convection in attic space behind collector (Experimental and CFD)

More Related