Current Issue : April - June Volume : 2019 Issue Number : 2 Articles : 5 Articles
The silicon solar cell with series-connected vertical junction is studied with\ndifferent lamella widths-the expression of the ac recombination velocity of\nthe excess minority carrier at the back surface is established. Spectroscopy\ntechnique reveals dominated impact of the lamella widths of the base....
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In this study, an exergy analysis of two kinds of solar-driven cogeneration systems consisting of solar collectors and an organic\nRankine cycle (ORC) is presented for series mode and parallel mode. Three kinds of solar collectors are considered: flat-plate\ncollectors (FPC), evacuated tube collectors (ETC), and parabolic trough collectors (PTC). This study mainly compares the\nexergy output of the two kinds of solar cogeneration systems under different temperatures of the return heating water and\ndifferent inlet temperatures of the solar collectors. This study shows that, from the perspective of Wnet or�����...
Research on concentrated solar power (CSP) plants has been increasing in recent years.\nSupercritical carbon dioxide (S-CO2) has been applied to solar power plants due to its promising\nphysical properties. S-CO2 has a relatively low critical temperature of 31.1 Degree centigrade and owns high density\nin the supercritical region. Hence, it is a vital working fluid in the application of low temperature\nheat source and miniature power equipment. Due to the fact that solar power system has a constantly\nchanging heat source according to season and weather, a satisfactory off-design performance is\nnecessary for the turbine in a solar power system. In this work, a S-CO2 radial-inflow turbine based\non CSP is designed. A thorough numerical analysis of the turbine is then performed. To investigate\nthe off-design performance of this turbine, three types of nozzle profiles with different leading edge\ndiameters are adopted. Mach number, temperature and pressure distribution are covered to present\nthe off-design effect with different nozzle profiles. Moreover, the relation of output power, mass flow\nrate and efficiency with different leading edge diameter (LED) are analyzed. Results show that\ndifferent LED has a vital influence on the aerodynamic characteristics and off-design performance of\nthe S-CO2 turbine based on CSP. In addition, the designed turbine with LED = 4 mm can obtain the\nhighest mass flow rate and output power. While the turbine with LED = 10 mm provides slightly\nbetter off-design efficiency for CSP plants....
Analysis of solar-cell array panel (SAP) data from the Arase satellite orbiting\nin the inner magnetosphere showed a clear degradation of solar cells that\ncould be attributed to trapped protons with energies greater than 6 MeV.\nProton fluence was determined based on variations in the open-circuit voltage\n(Voc) of the solar cells, which we compared with that expected based on\nvarious distribution models (AP8MAX, AP9 mean and CRRESPRO quiet) of\ntrapped protons. We found a general agreement, confirming the major contribution\nof trapped protons to the degradation, as well as a slight difference\nin the fluence expected based on the model calculations. To minimize this\ndifference, we slightly modified the models, and found that concentrating the\nenergetic protons on the magnetic equator provided a better agreement. Our\nresults indicate that >6 MeV protons also has the equatorial concentration as\nreported for >18 MeV protons from the Van Allen Probes observation, and\nare interpreted as two components of the trapped protons, i.e. , those of solar\nenergetic particle (SEP) origin have an anisotropic pitch-angle distribution\nand are confined near the magnetic equator...
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