研究目的
To design and analyze a hybrid concentrated photovoltaic thermal system coupled with a parabolic trough collector for combined heat and power output, investigating its performance theoretically and experimentally under varying flow rates.
研究成果
The hybrid concentrated photovoltaic thermal system demonstrated good performance with mean overall efficiencies ranging from 61.42% to 66.36% under varying flow rates. The theoretical model was validated with experimental data, showing good agreement. The system has potential for low-grade thermal applications like distillation and heating, with significant carbon mitigation potential.
研究不足
The study assumes one-dimensional steady-state heat transfer and uniform circumferential heat flux across the absorber tube, which may introduce some error. Additionally, the experimental setup was limited to a lab-scale system, and the performance might vary in larger-scale applications.
1：Experimental Design and Method Selection:
The study involved designing a hybrid concentrated photovoltaic thermal system with a photovoltaic module mounted on a parabolic trough absorber tube. The system was designed to cool the photovoltaic panel from both surfaces by flowing water through the absorber tube and the annulus between the absorber tube and glass cover.
2：Sample Selection and Data Sources:
The experimental setup was installed in Birla Institute of Technology and Science (BITS) Pilani, Rajasthan, India. Data was collected during May and June 2017, focusing on solar radiation, ambient temperature, and system performance parameters.
3：List of Experimental Equipment and Materials:
The setup included a parabolic trough collector with a reflective anodized aluminium sheet, a hybrid CPVT receiver tube, thermocouples for temperature measurement, rotameters for flow rate measurement, and tanks for water storage.
4：Experimental Procedures and Operational Workflow:
The experiment was conducted by varying the annulus and inner tube flow rates. Measurements included solar insolation, ambient air temperature, PV panel temperature, inlet and outlet temperatures of the HCPVT system, and electrical output.
5：Data Analysis Methods:
The performance of the system was evaluated in terms of thermal and electrical efficiencies. The experimental data was compared with theoretical results obtained from a MATLAB-based model.
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