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With the development of photovoltaic (PV) power generation systems in single houses, research has recently focused on the prediction of PV power generation to match PV power generation with building energy consumption characteristics. However, prediction models for PV power generation under different weather conditions based on the actual monitoring data of the PV power generation system in a single house are still lacking. The present study is based on the actual monitoring of PV power generation data of a single house with a PV system that was installed in Beijing 5 years ago. We analysed the main weather factors affecting PV power generation and power conversion efficiency (PCE). The results showed a positive correlation between power generation and solar radiation, with the ambient temperature (Ta) and total cloud cover (TCC) being the main weather factors affecting power generation and PCE. Based on the analysis results, a support vector regression (SVR) model was established to predict PV power generation. In addition, the mean absolute error (MAE), mean absolute percentage error (MAPE) and coefficient of variation (R2) of the SVR model were 3.39, 34.7% and 0.86, respectively, which can accurately be used to predict PV power generation under different weather types. [ABSTRACT FROM AUTHOR]

Taking carbon dioxide (CO2) as a significant C1 source and converting it into value-added chemicals presents a promising strategy for addressing the energy and environmental issues arising from excessive anthropogenic emissions. Nevertheless, catalytic CO2 conversion, particularly under moderate conditions, remains a formidable challenge. Herein, a composite of Aza-COF-immobilized silver nanoparticles (Ag NPs), Ag/Aza-COF, was successfully fabricated by taking the nitrogen-rich COF, Aza-COF, as the porous carrier. Catalytic experiments revealed that with the presence of Ag/Aza-COF, 100% conversion of 2-methylbut-3-yn-2-ol to the corresponding alkylene cyclic carbonate was achieved after 9 h of reaction at ambient temperature and pressure using CH3CN as the solvent. Further studies revealed that the Ag/Aza-COF exhibits very high catalytic activity and effective recyclability in CO2 fixation with alkynyl alcohol and alkynyl amine at moderate conditions, surpassing the performance of surfactant-protected Ag NPs. X-ray photoelectron spectroscopy and Raman spectral analyses elucidated that strong interactions resulting from the coordination between the nitrogen atoms in the Aza-COF and Ag atoms in Ag NPs prevents their further aggregation and thereby preserving the high activity and recyclability of the composite. This finding demonstrates that the judicious selection of appropriate porous materials to restrict the aggregation of metal particles can yield efficient nanocatalyst composites. [ABSTRACT FROM AUTHOR]