| Using the concentrating and tracking technology, the photovoltaic and thermal integrationdevice makes the per unit area of the PV cells to get several times of illumination intensity, thegenerated electrical energy of the PV cells per unit area is increased. Using the laminationprocessing, the PV cells and heat exchanger are laminated together to make sure that the PV cellswill always work under60℃.The photovoltaic and thermal integration device keeps the PVcells’ photoelectric conversion efficiency in a high level, and the energy of the sun that cannot beconverted into electrical energy is also collected at the same time, that realizes the photovoltaicand thermal comprehensive utilization. As the major component of the photovoltaic and thermalintegration device, the condensing unit has a great impact on working performance of theintegration device. The strength analysis and stiffness analysis of the condensing unit, and theoptimum design for it are effective methods to guarantee the working performance and servicelife, which is of great engineering significance.According to the demand of the subject, the main research is composed of these followingrespects:1) Finite element model of condensing unit of the photovoltaic and thermal integrationdevice is established and static strength analysis of the model is completed. Using Hypermeshand ANSYS Workbench, the co-simulation is a great method to build the finite element modeland complete the static strength analysis. Under the equivalent uniform load of a fresh gale,whose direction is perpendicular to the PV cells, strength and stiffness of the condensing unit isanalyzed.2) The strain and stress of the key parts of the condensing unit is measured by strainelectrical measuring method. According to the results of static strength analysis, the key points ofthe condensing unit is selected, whose strain and stress are to be measured. Contrasting to theresults of the measuring, the finite element model is checked, and a reliable finite element modelis got after the checking. At last, the gravity is considered, the strength and stiffness of thecondensing unit is analyzed under the equivalent uniform load of a fresh gale or the equivalentuniform load of a hurricane, whose direction is perpendicular to the PV cells.3) The dynamic analyze of the condensing unit. Taking advantage of the virtual prototypetechnology, virtual prototype of the condensing unit is built in ADAMS. Under the equivalent uniform load of a fresh gale, whose direction is horizontal, dynamic analysis of the condensingunit is completed. The results will show the location, when the support force of bearings reachesthe maximum. Then the finite element model of the condensing unit in that location is used toanalyze the strength and stiffness.4) The optimum design for condensing unit of photovoltaic and thermal integration device.The DesignXplorer of ANSYS Workbench is used to optimize the structure parameters of thecondensing unit, including the structure parameters of cantilever beam, supporting steel tube,link block. On the premise of enough strength and enough stiffness, steel consumption of thecondensing unit is reduced, weight of the condensing unit is lower, and also the cost is lower.Through the above researches, static performance and dynamic performance of thecondensing unit is analyzed by finite element method. On the premise of well workingperformance, the optimum design for condensing unit of photovoltaic and thermal integrationdevice is completed, and the weight of the condensing unit is almost reduced by8.0%, the steelconsumption of the condensing unit is reduced by11.2%. |
