Study On The Cogeneration Performance Of Asymmetric Compound Parabolic Concentrator With Flat Plate Absorbe

The energy challenge has gradually risen to the strategic position at the national level with the continuous development of civilization.Human needs to change the existing pattern of energy consumption,the main position of energy consumption to the pollution-free new energy,among which the limitation of conventional energy promotes the rapid development of solar energy technology.In order to prevent the development of solar energy resources from being restricted by temporal and spatial factors and to further develop its diversified application,an asymmetric Compound Parabolic Concentrator was designed based on the solar angle of winter and summer solstices,which can improve the seasonal distribution of energy and improve the utilization rate of light field throughout the year.The solar A-CPC also has the advantages of meeting the human seasonal heat demand,eliminating the shadow phenomenon of array layout,effectively reducing the center of gravity of the integrated system,saving system support materials,etc.Therefore,further research on A-CPC is more beneficial to its application in a wider range of industrial-agricultural fields.The project of photovoltaic photovoltaic photothermal integration was put forward,and the A-CPV/T cogeneration integrated system was established by coupling it with PV/T system.The energy conversion model was established by theoretical model construction and C language programming.In order to explore its performance,an outdoor intelligent experimental platform was built to verify the reliability of its light-concentrating physical model and thermoelectric conversion model.Various experimental data obtained were compared with theoretical parameters to evaluate the related performance of the system.(1)The surface structure of the plane absorber A-CPC was constructed,and the concentrating performance of the constructed A-CPC was verified through visual laser experiments and outdoor fixed natural light path experiments.It was found that the average optical efficiency of A-CPC was 43.9% within the full incident angle range,which was 10.7% higher than that of S-CPC with the same specifications.Moreover,A-CPC can effectively improve the uniformity of energy flow distribution on the absorber’s surface.The A-CPC’s average daily direct radiation collection time throughout the year is 10.68 hours,which is 49.4% higher than that of S-CPC.The ACPC’s lighting performance is better than that of S-CPC,with an annual total lighting capacity increased by 32.2%.Furthermore,the solar radiation collection characteristics of A-CPC also match the actual energy demand seasonally.(2)The theoretical design of the A-CPC coupled photovoltaic-thermal cogeneration system was carried out by constructing the theoretical model of solar photovoltaic power generation through determining the output characteristic equation of the five-parameter method’s circuit and selecting the battery.Moreover,the thermal resistance network diagram and theoretical model of photothermal conversion were constructed by determining the useful energy of photovoltaic components,the recovered thermal energy,and the heat loss of photovoltaic components.The comprehensive performance evaluation standard of the integrated system was given by parameters such as the photovoltaic component’s power generation efficiency,the thermal energy recovery efficiency,the integrated system fusion thickness-weighted total efficiency,and the comprehensive economic benefits.(3)An integrated experimental platform was constructed to evaluate the performance of a thermoelectric combined heat and power system.Under experimental conditions where irradiation,wind speed stability,and temperature rise had a relative error of only-0.58%,the maximum electric heating power was 23.8 W and 80.0 W,and the average power was 21.51 W and 71.41 W.The average relative error of the electric heating output efficiency was only 0.54% and-4.76%.The maximum uncertainties of electric heating were 9.21% and 11.12%.The maximum weighted efficiency of the theoretical and experimental results were 60.61% and 63.96%,respectively,while the average weighted efficiency was 55.55% and 54.54%,respectively.The high degree of fit between the two groups of data verified the accuracy and reliability of the theoretical model of the thermoelectric combined heat and power system,which can evaluate various performance parameters of the experiment.These results also demonstrated that the experimental system has outstanding energy collection and utilization efficiency.