研究目的
To improve the e?ciency of ?at-plate photovoltaic thermal (PVT) systems, which use solar energy to produce heat and electricity simultaneously, by investigating the effects of various flow rates of water and nanofluids (CuO/water, Al2O3/water) as working fluids on the system's performance.
研究成果
The study confirmed that the heat transfer characteristics were improved by adding nanoparticles to the base fluid, suggesting that the application of nanofluids can enhance system efficiency through increased heat transfer. The PVT system using nanofluids showed a significant increase in thermal efficiency compared to the water-based system, but the difference in electrical efficiency was not significant. The optimal flow rate for the PVT system using water as the working fluid was found to be 3 L/min. For further investigation of the effect of nanofluids on efficiency, research should be conducted on tracking and concentrating PVT systems where higher cell temperatures could be induced.
研究不足
The study was limited by the fixed orientation of the PVT system, which did not track the sun, potentially limiting the maximum temperature of the heating medium and the surface temperature change on the cell. The area of the PV module used was very small, which might not significantly change the cell's efficiency due to its thermal characteristics.
1：Experimental Design and Method Selection:
The study involved an efficiency analysis of a PVT system with various flow rates of water and nanofluids as working fluids. The PVT system consisted of a PV module, solar absorbing tube, storage tank, circulating pump, etc. The system was installed at a 45-degree angle to the full south without tracking the sun.
2：Sample Selection and Data Sources:
Water and nanofluids (CuO/water, Al2O3/water) were used as working fluids. The nanofluids were prepared by dispersing metallic nanoparticles in distilled water at a concentration of 0.05 wt.% with added surfactants for dispersion stability.
3：05 wt.% with added surfactants for dispersion stability.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included resistance temperature detectors (PT100?), thermocouples, a data logger (GL820), a pyranometer (EQ-08), a weather station (Wireless Vantage Pro2 Plus), a Solar Module Analyzer (PROVA 210), and a flow meter (PA-60).
4：0).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Experiments were conducted for 240 minutes, with temperature data collected in 1-minute increments and averaged over 10 minutes. The flow rate was controlled and set to 1, 2, 3, and 4 L/min for water-based experiments. Nanofluids were prepared using a two-step method involving stirring and ultrasonication.
5：Data Analysis Methods:
Thermal and electrical efficiencies were calculated using specific equations, and the overall efficiency was evaluated as the sum of thermal and electrical efficiencies.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
