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Investigation of the entropy generation and efficiency of a solar thermophotovoltaic system

Chinese Science Bulletin 2010年第32期55卷 3718-3726页

作者： chen xue xuan yimin han yuge School of Power Engineering Nanjing University of Science and Technology Nanjing 210094 China

Based on the second law of thermodynamics,a theoretical model is established for efficiency analysis and optimization of a solar thermophotovoltaic (STPV) system. The entropy generation in the photo-electricity conversion process is numerically calculated and analyzed for the component modules involved in the whole system assembly. The effects of the emitter temperature,concentration ratio,energy bandgap,cell temperature and the transmissivity of the filter on the entropy and the efficiency are investigated. Meanwhile,the conversion efficiencies of the modules are discussed. The following results are obtained:at first the entropy generation of the system reduces but then increases with the rise of the emitter temperature. When the concentration ratio improves,the entropy generation of the system falls. The increase of the bandgap value and chemical potential of the cell also causes the reduction of the entropy generation. Along with the increase of the cell temperature,the entropy generation increases and the conversion efficiency of the STPV system decreases.

关键词：光电系统熵产生太阳能热力学第二定律电池温度分析模块转换效率模型分析

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Investigation on performance of a solar thermophotovoltaic system

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Science China(Technological Sciences) 2008年第12期51卷 2285-2294页

作者： chen xue, xuan yimin & han yuge School of Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China School of Power Engineering Nanjing University of Science & Technology Nanjing China

In the light of the thermo-electric conversion principle, a model for predicting the performance of a solar thermophotovoltaic system is presented. The temperature distributions of the emitter for different concentrator ratios are numerically computed and the influence of the concentrator ratio on the system performance is analyzed. Numerical results show that the emitter temperature and the system efficiency increase with increase of the concentrator ratio. The effects of some other factors such as the spectral filter, cell temperature, and the reflectivity of the top and bottom surfaces of the emitter on the conversion performance of the STPV system are discussed.

关键词： STPV emitter temperature system efficiency

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Thermal analysis and optimization of the emitter in the solar thermophotovoltaic (STPV)

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Science China(Technological Sciences) 2009年第10期52卷 2660-2669页

作者： chen xue xuan yimin han yuge School of Power Engineering Nanjing University of Science&TechnologyNanjing 210094China

A model for predicting the performance of the emitter in the solar thermophotovoltaic (STPV) system is presented in this article. The effect of non-parallelism of sun rays on concentration capability is numerically calculated,also the flow field in the emitter cavity and the temperature distribution of the emitter with different inlet conditions are compared. Numerical results show that free convection of the air inside the emitter cavity has great effect on the emitter temperature and may reduce the electricity output of the cells. At last,a new kind of selective film is put forward. Through optimizing the cut-off wavelength of a selective film,radiation loss is further reduced and system efficiency is improved.

关键词： the solar thermophotovoltaic (STPV) emitter free convection selective film

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