Research Progress of PV/T Collector Cooling Technology
Solar photovoltaic photothermal integrated module is composed of photovoltaic and solar thermal two parts,of which photovoltaic panels can provide the required electric energy in various fields,because the increase of photovoltaic temperature will affect the electrical efficiency and battery life of photovoltaic modules,so add solar thermal part in the photovoltaic system,the excess heat is transferred and utilized,thereby improving the comprehensive utilization efficiency of solar energy.Solar photovoltaic photothermal(PV/T)systems that use liquid and air as heat transfer media are convection to cool photovoltaics,and nanoparticles can be added to water-based PV/T to improve the temperature uniformity of the working fluid and the stability of the system at high cell temperature peaks.In order to improve the stability and thermal conductivity of nanofluids,hybrid nanofluids can be used or phase change materials can be added to a single nanofluid.PV/T systems cooled by phase change materials(PCM)are cooled by conduction,and the temperature drop rate can be controlled by adjusting the thickness of the PCM,or the thermal conductivity of the components can be increased by filling the PCM with nanoparticles,so as to improve the thermal/electrical efficiency of the PV/T system.Through the analysis,the directions of further research can be carried out as follows:the influence of the concentration and working temperature of mixed nanofluidic particles on their thermal conductivity,the theory of two-phase flow heat transfer and the influence of particle interaction on the stability of nanofluids,the dynamic theoretical study of the influence of fluctuations of external influencing factors on PV/T systems,the influence of PCM itself on the charging and releasing heat rate and cycling time,the influence of the number of heat pipes considering economy on the performance of PV/T systems,and the dynamic prediction of solar PV/T heat pump systems.
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