Spectral Control And Structure Design For STPV System With Metamaterials

Solar Thermophotovoltaic system has become one of the hottest research areas in the recent decades.By applying high performance spectral control module,the STPV system shows several merits,including high energy conversion efficiency and high output power.This work aims to optimize the spectrol control module,base on which we design the STPV system.Also,we analyze the influence imposed on the STPV system performance by the EAAR and solar concentration factor.The detailed contents are focused on the following aspects:The multilayers structure is designed by adopting the Effective Medium Theory(EMT),and the spectral absorptivity of the multilayers structure is obtained in application of RCWA algorithm.Also,the effect of incident angle and other geometrical parameters are investigated;Incombinating of EMT and Transfer Metrices Theory(TMT),the two-dimensional DSi-SiO2 photonic crystal has been proved to nearly be independent from incident angle.The doping concentration of doping silicon,height of the crystal and the filling factor are all put into consideration for the photonic crystal's performance.The spectral characteristics of one-dimensional Si-SiO2 photonic crystal and one-dimensional Ag-MgF2 photonic crystal,and the effect of incident angle and cell number on the performances of two types of photonic crystals are investigated by applying the TMT.The structures of two types of photonic crystals are modified in order to eradicate the oscillation characteristics of the spectral reflectivity of two types of photonic crystals.It turns out that the effective transmission ratio and the transmission efficiency are much better than that of the unmodified structures.The energy equation of the STPV system is constructed,based on which the influences of the spectral cut-off wavelengths of the ideal absorber and ideal emitter on the performance of every part of the system are investigated.In addition,the performance analysis of the STPV system with multilayer structure being selective absorber and emitter and one-dimensional photonic crystal being selective filter has been done and the the influence of both unit EAAR and optimized EAAR on the temperature distribution of the absorber and emitter,the absorber efficiency,the emitter-filter efficiency,the cell efficiency and the system efficiency are investigated and compared.