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Energy and exergy analysis of photovoltaic-thermal collector with and without glass cover

Author

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  • Chow, T.T.
  • Pei, G.
  • Fong, K.F.
  • Lin, Z.
  • Chan, A.L.S.
  • Ji, J.

Abstract

In photovoltaic-thermal (PV/T) technology, the use of glass cover on the flat-plate hybrid solar collector is favorable to the photothermic process but not to the photovoltaic process. Because of the difference in the usefulness of electricity and thermal energy, there is often no straight forward answer on whether a glazed or unglazed collector system is more suitable for a specific application. This glazing issue was tackled in this paper from the viewpoint of thermodynamics. Based on experimental data and validated numerical models, a study of the appropriateness of glass cover on a thermosyphon-based water-heating PV/T system was carried out. The influences of six selected operating parameters were evaluated. From the first law point of view, a glazed PV/T system is found always suitable if we are to maximize the quantity of either the thermal or the overall energy output. From the exergy analysis point of view however, the increase of PV cell efficiency, packing factor, water mass to collector area ratio, and wind velocity are found favorable to go for an unglazed system, whereas the increase of on-site solar radiation and ambient temperature are favorable for a glazed system.

Suggested Citation

  • Chow, T.T. & Pei, G. & Fong, K.F. & Lin, Z. & Chan, A.L.S. & Ji, J., 2009. "Energy and exergy analysis of photovoltaic-thermal collector with and without glass cover," Applied Energy, Elsevier, vol. 86(3), pages 310-316, March.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:3:p:310-316
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    References listed on IDEAS

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    1. Hepbasli, Arif, 2008. "A key review on exergetic analysis and assessment of renewable energy resources for a sustainable future," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(3), pages 593-661, April.
    2. Joshi, Anand S. & Tiwari, Arvind, 2007. "Energy and exergy efficiencies of a hybrid photovoltaic–thermal (PV/T) air collector," Renewable Energy, Elsevier, vol. 32(13), pages 2223-2241.
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