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A dynamic model for air-based photovoltaic thermal systems working under real operating conditions

Author

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  • Sohel, M. Imroz
  • Ma, Zhenjun
  • Cooper, Paul
  • Adams, Jamie
  • Scott, Robert

Abstract

In this paper a dynamic model suitable for simulating real operating conditions of air-based photovoltaic thermal (PVT) systems is presented. The performance of the model is validated by using the operational data collected from the building integrated photovoltaic (PVT) systems installed in two unique buildings. The modelled air outlet temperature and electrical power match very well with the experimental data. In Solar Decathlon house PVT, the average (RMS) error in air outlet temperatures was 4.2%. The average (RMS) error in electrical power was also 4.2%. In the Sustainable Buildings Research Centre PVT, the average errors (RMS) of PV and air temperatures were 3.8% and 2.2%, respectively. The performance of the PVT system under changing working condition is also analysed in this paper. The analysis includes the effect of ambient air temperature, air inlet temperature, air flow rate and solar irradiation on thermal, electrical, first law and second law efficiencies. Both the thermal and the 1st law efficiencies almost linearly increased with the increase of the ambient temperature. However, the PVT electrical efficiency and the second law efficiency decreased with the increase of the ambient temperature. All efficiencies expect the second law efficiency decreased with increase of the PVT air inlet temperature. The second law efficiency first increased and then reduced. With increasing the air flow rate all the efficiencies increased. The electrical and second law efficiencies become less sensitive when the air flow rate exceeded 300l/s. Both the thermal and the 1st law efficiencies decreased while the electrical efficiency and the second law efficiency increased with the increase of the solar irradiation. The efficiencies found to be very sensitive for low level of solar irradiations. At about 400Wm−2 irradiation efficiencies became less sensitive.

Suggested Citation

  • Sohel, M. Imroz & Ma, Zhenjun & Cooper, Paul & Adams, Jamie & Scott, Robert, 2014. "A dynamic model for air-based photovoltaic thermal systems working under real operating conditions," Applied Energy, Elsevier, vol. 132(C), pages 216-225.
    • Handle: RePEc:eee:appene:v:132:y:2014:i:c:p:216-225
    DOI: 10.1016/j.apenergy.2014.07.010
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    References listed on IDEAS

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