Experimental Study On Active Cooling Of High-concentration Three-junction Photovoltaic Cells

Solar energy is an important renewable energy source with abundant reserves and environmental protection.The development and utilization of solar energy is one of the important means to solve the energy shortage.As a third-generation photovoltaic cell,the triple-junction GaAs solar cell has higher power generation efficiency than the previous two generations of photovoltaic cells.Concentrating photovoltaics can generate electricity by converging solar energy,which can reduce battery consumption and save energy and environmental protection.However,if the concentrating photovoltaic system does not effectively dissipate heat,it will affect the power generation efficiency and service life of the battery,thereby affecting the stability of the entire concentrating photovoltaic system.Therefore,this topic designed a manifold heat sink,through the active cooling method to cool the solar cell,complete the experimental study of high-concentration photovoltaic active cooling.According to the different experimental conditions,the indoor experimental system and the outdoor experimental system were designed.The basic principles,basic components and differences of the two experimental systems were introduced.The energy loss problem in the concentrating photovoltaic experiment was analyzed,and the calibration of the indoor and outdoor related experimental parameters was completed.In this experiment,six types of water-cooled heat sinks,large-size heat sinks and compact heat sinks,were designed.In the indoor experimental system,the heat dissipation experiments of different structural heat sinks for different flow rates and different cooling water temperatures were carried out.and then collecting the open circuit voltage,short-circuit current,maximum power and other electrical parameters of the solar cell output during the experiment,through the solar cell analyzer,and collecting the temperature parameters such as battery temperature,heat sink temperature,cooling water inlet temperature and outlet temperature through the temperature measuring device.The performance factors such as fill factor,power generation efficiency,thermal efficiency and heat transfer coefficient of the concentrating photovoltaic system were calculated.The heat dissipation effects of different structure heat sinks were compared,and the advantages and disadvantages of different structure heat sinks were analyzed.Finally,the heat sink with strong environmental adaptability,small volume and high cost performance is used for battery cooling of the concentrating photovoltaic system.And under the premise of ensuring good operation of the battery,the heat dissipation scheme of the concentrating photovoltaic system is determined.Due to limited laboratory conditions in the laboratory,and in the practical application of concentrating photovoltaic systems,it is necessary to adapt to different solar terms,as well as changes in light intensity at different time points.In order to improve the experimental results and verify the practical application of the indoor cooling experimental scheme under outdoor environmental conditions,the heat sinks selected based on the indoor experiments are separately prepared for different solar terms,different time periods and different concentrating multiples.The experimental research of concentrating photovoltaic power generation collected the output parameters of the experimental system,analyzed the operation of the experimental system,recorded and analyzed other influencing factors encountered in the actual outdoor operation,and proposed corresponding solutions and results.