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Thermal management of concentrator photovoltaic systems using nanoa??enhanced phase change materialsa??based heat sink
摘要： Temperature regulation of concentrator photovoltaic systems is essential in reducing operating temperatures with higher system performance. A new nano-enhanced phase change material, with multi-cavity heat sinks, integrated with a concentrator photovoltaic (CPV) system is developed. The multi-cavity heat sink includes a single-, triple-, and quintuple-cavity configuration in both parallel and series pattern filled with n-octadecane PCM and graphene nanoparticle additives with 2% and 5 wt%. Numerical simulations are performed using the developed two-dimensional model for photovoltaic layers integrated with the nano-enhanced phase change material-based heat sink. The predicted results are compared with the available numerical results and measurements. Results indicate that increasing the number of parallel cavities, along with weight fraction of nanoparticles, significantly improves the thermal conductivity, and consequently attains better performance for the CPV system. Using a parallel quintuple-cavity configuration, with 5 wt% NPCM, achieves maximum reduction in the solar cell mean temperature along with the best temperature uniformity compared to other configurations. At a concentration ratio of 20, the thermal efficiency is 65%, the electrical efficiency is about 10%, and the output electrical power of the system is 235 W per m width of the cell. On the contrary, using a series pattern of the heat sink has an unfavorable effect on the mean solar cell temperature, as well as on electrical efficiency and thermal performance of the CPV system. The obtained result can assist in identifying the best possible design of the heat sink in addition to the most appropriate selection of PCM and nanoparticle additives.
关键词： electrical efficiency,graphene nanoparticles,concentrator photovoltaic system,multi-cavity heat sink,nano-enhanced phase change materials
更新于2025-09-23 15:21:01
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Optimization Study of Parasitic Energy Losses in Photovoltaic System with Dual-Axis Solar Tracker Located at Different Latitudes
摘要： Despite the sun-tracking system maximising the annual yield of solar power generation, the inevitable parasitic energy losses from the sun-tracking mechanism related to range of motion should be considered. This paper presents a systematic approach to investigate the annual accumulated parasitic energy losses in photovoltaic (PV) or concentrator photovoltaic (CPV) system installed in a dual-axis solar tracker located at various locations with latitudes ranging from 45°N to 45°S. This approach allows the engineers to evaluate and to optimize the PV/CPV system performance by determining the least parasitic energy loss in the cases of fixed and non-fixed stow positions. The results show that the solar tracker with non-fixed stow position always has lower annual accumulated parasitic energy losses as compared to that of fixed stow position located in different latitudes.
关键词： Concentrator photovoltaic system,Photovoltaic system,Dual-axis solar tracker,Azimuth-elevation tracking,General sun-tracking formula,Parasitic energy losses
更新于2025-09-12 10:27:22