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Validation of Thermal Models for Bifacial Photovoltaic Systems under Various Albedo Conditions
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  • Aline Kirsten Vidal de Oliveira,
  • Marília Braga,
  • Helena Flávia Naspolini,
  • Ricardo Rüther
Aline Kirsten Vidal de Oliveira
Universidade Federal de Santa Catarina

Corresponding Author:[email protected]

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Marília Braga
Universidade Federal de Santa Catarina
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Helena Flávia Naspolini
Universidade Federal de Santa Catarina
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Ricardo Rüther
Universidade Federal de Santa Catarina
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Abstract

This study evaluated the performance of three photovoltaic (PV) module operating temperature models — Ross, Faiman, and PVsyst® — using different measurement time resolutions for bifacial PV systems under various albedo conditions. This work also analyzed the application of the models with the use of effective irradiance - including front and rear-side plane of array irradiance - for the estimation of bifacial PV module temperature. The calculated heat transfer coefficients for each evaluated scenario are presented and discussed in detail. A comparison of all simulated cases was carried out to recommend the most suitable model for each situation. Additionally, the use of estimated cell operating temperature from back-of-module temperature was evaluated across all scenarios. As expected, hourly resolutions provided better results for all scenarios, having the lowest error for temperature estimations across different models and ground (albedo) types. Using calculated coefficients and taking into account rear-side irradiance resulted in more accurate temperature predictions, emphasizing the importance of model adaptations and refined parameterization. The results for different heat transfer coefficients varied significantly among the models. Ross’s model applied with standard values (k between 0.2 and 0.4) showed close alignment with measured data. In contrast, Faiman’s model with standard coefficients ( U 0   between 24 and 27 W/m²·°C, U 1   between 6 and 8 W/m²·°C/m/s) and PVsyst’s standard coefficients ( U c =29 W/m²·°C, U v =0 W/m²·°C/m/s) exhibited significant deviations. Adjusted coefficients for PVsyst ( U c =40 W/m²·°C, U v =0 W/m²·°C/m/s) provided better accuracy. The standard PVsyst coefficients presented better results when compared against cell-adjusted temperature estimates, rather than back-of-module measured values. This discrepancy can lead to significant estimation errors in both temperature output performance and for bifacial modules. Highlights Analysis of PV module temperature models taking into account rear-side irradiance for bifacial PV systems Evaluation of temperature models applied to bifacial PV modules exposed to various albedo levels and at different time resolutions Estimation of heat transfer coefficients for bifacial PV modules
Submitted to Progress in Photovoltaics
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