Multiple operational strategies investigations of the PV/T collectors based on 3 days ahead hourly radiation prediction

Shiqian Dong, Yanqiang Di, Yafeng Gao, He Long, Zhixuan Fan, Jingxuan Guan, Lijun Han and Yingming Wang

Applied Energy, 2025, vol. 377, issue PA, No S0306261924017665

Abstract: The PV/T collectors are the advanced photovoltaic and photothermal integration technology, realizing full-spectrum utilization. The energy profitability of PV/T collectors not only depends on sophisticated equipment but also significantly correlates with the operational conditioning. Hybrid operational strategies are analyzed with the WOA algorithm based on 3 days ahead hourly prediction model for horizontal total solar radiation. The 3-day variable inclination strategy is unsatisfactory. The monthly cumulative radiation increases by 8 % relatively with the ground reflectivity varying from 0.4 to 0.95. And, the 5 % addition of ground reflectivity leads to an average improvement of 0.45 %. The optimal long-side and wide-side ratios of the reflector are 0.9 and 0.6 with an improvement of 8.79 % and 3.85 % in thermal and electrical gain. Compared to fixed PV/T without a reflector, the multi-hybrid strategy can achieve a relative improvement of 17.76 % and 13.61 % in thermal and electrical gain for the novel PV/T with graphite and trapezoidal fluid channels, equivalent to 39.5 MJ and 7.8 kWh with a 2.08 m2 effective area. Finally, the best model is LSTM-Attention with the R2_train and R2_test of 96.8 % and 94.0 % for 3 days ahead hourly radiation prediction. The contribution of this paper provides references on the operational optimization of PV/T collectors, especially for household rural PV/T systems.

Keywords: PV/T collectors; Operational strategies; Time sequence algorithms; Hourly radiation prediction; WOA optimization algorithm (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.apenergy.2024.124383

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