Experimental Study on Performance of Spectrum-Splitting Photovoltaic/Thermal Hybrid Unit Using Aqueous Ag-SiO2 Nanofluid as Working Fluid
A photovoltaic/thermal(PV/T)collector that uses a nanofluid splitter can decouple the working temperature of the photovoltaic and thermal modules,achieving higher overall solar utilization efficiency.In this article,an innovative PV/T collector structure was designed using aqueous Ag-SiO2 nanofluid as the splitter and heat transfer fluid.The thermal and electrical properties of the spectrum-splitting PV/T collector hybrid unit were studied under four different mass concentrations and operating conditions of aqueous Ag-SiO2 nanofluid.The results show that the mass concentration of aqueous Ag-SiO2 nanofluid significantly affects the performance of the hybrid unit of the PV/T collector.When the mass concentration is 0.025％,the comprehensive efficiency is about 63.21％,which is about 38.04％higher than that when water is the spectrum-splitting fluid.The fitting relationships between the thermal,electrical,and comprehensive efficiency of the hybrid unit of the PV/T collector and the mass concentration of different nanoparticles are obtained during the spectrum-splitting with aqueous Ag-SiO2 nanofluid,which provides a theoretical basis for adjusting the thermal and electrical output of the PV/T collector by controlling the mass concentration parameters of the nanofluid.
solar energynanofluidspectrum-splittingPV/Tmass concentration
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