A novel solar spectrum splitting PV-CPT hybrid conversion system based on linear Fresnel filter-concentrator structure: Experimental device and application analysis

This study investigates the solar energy efficient conversion of photovoltaic-concentrated photothermal (PV-CPT), integrating the multilayer selective filter into a Linear Fresnel concentrating structure for full-spectrum splitting and residual-spectrum concentration. The optical filter designed for Si PV cell achieves high transmittance in the respond waveband, transmitting 60.7 % solar energy for PV power generation. The residual spectrum is reflected and concentrated by the Linear-Fresnel selective filter field to the thermal receiver. Three typical thermal utilization methods, Organic Rankine Cycle (ORC), Methanol Decomposition (MD) and coupling with Steam Rankine Cycle (SRC) are analyzed for CPT conversion. The exergy efficiencies of these processes are evaluated to understand the mechanism of irreversible losses. The power generation efficiencies of hybrid systems based on ORC, MD, and coupling with SCR are 31.56 %, 31.73 % and 32.65 %, respectively. The coupling with SRC method achieves a higher CPT exergy efficiency of 21 % while having the highest hybrid system efficiency, making it the optimal for residual-spectrum CPT conversion. An experimental device and a thermo-physical model of the system are developed to evaluate system performance, with the receiver tube reaching 435 K at a concentration ratio of 9.8. This study provides valuable insights for the implementation of high-efficiency solar full-spectrum energy conversion.