Current Issue : April - June Volume : 2020 Issue Number : 2 Articles : 5 Articles
The performance of solar panels significantly degrades due to dust accumulation\nbut cleaning too frequently will severely impact the financial benefits of\nthe installation of solar panels. This paper assumes a realistic linear model for\naccumulation of dust on the solar panels and the resulting hourly average of\nabsolute loss of efficiency in solar panels. This model accurately depicts the\nfact that energy production by solar panels occurs during sunshine hours only\nand also accounts for the degradation in the efficiency of solar panels due\nto dust accumulation throughout the entire day. Based on this, the optimal\nnumber of days for maximum financial profit and the critical number of days\n(above which there is no profit in installing solar panels) have been estimated.\nFurthermore, we have suggested a formalism to help estimate the finances for\nself-cleaning technology for PV system and also for calculating the minimum\npayback period for installing solar panels with the financial cost of the cleaning\ncycles properly considered. This research could be motivation for companies\nin developing self-cleaning mechanism for PV system....
This work aims to design a cleaning system for the solar PV panels under\nMedina climatic conditions. This system powered by the PV module itself.\nFull cleaning system has been designed and tested utilizing a wiper and water\njet to remove the accumulated dust and other dirt from solar panels surface.\nThe proposed cleaning system can be worked for long time efficiently. All the\nstrength system components were examined and found to be stable and reliable.\nAlso, the performance of cleaning system evaluated and comparison between\nthe clean and dusty module performance has been conducted. The system\nperformance has been evaluated for both clean and dusty panel at variable\ninputs of solar radiation. At input power of 805 W/m2, the efficiency\nfound to be 13.78% for the cleaning panel and 9% for dusty panel, whereas at\nthe input power of 460 W/m2, the estimated efficiency was 12.6% and 7.3%\nfor clean and dusty panel respectively. Significant reduction in the efficiency\nhas been reported as 35% and 42% for both cases. Therefore, the present\nwork can be considering as a promising and efficient system to solve the\nproblem of poor performance of the photovoltaic cells in areas that experience\ndusty environment and external pollutants. In addition, it is safe clean\nand economic system....
Environmental conditions such as wind, temperature and humidity affect the\namount of solar irradiance received by the photovoltaic (PV) cells and thus\nhave a significant effect on the PV output efficiency. This paper aims to analyze\nthe power efficiency of Polycrystalline Silicon solar cells under Chinaâ??s\nweather considering these environmental conditions. Performance of the Polycrystalline\nsolar panel is analyzed through eight months of data emphasizing\nthe maximum, average and minimum temperature acquired from a solar\npower plant installed at Taiyuan University of technology, China consisting\nof 78 PV panels with a total rated capacity of 20 KW and average module efficiency\nof 16.56% at an ambient temperature of 25Degree. The results of our practical\ninvestigations show that polycrystalline solar cells in October yield the\nbest monthly average efficiency of 35.6% at an average temperature and humidity\nlevel of 14DegreeC and 44%. In comparison to a maximum temperature of\n27DegreeC and humidity of 66% in summer, the efficiency is found to drop by 5%.\nAlso, the power produced in winter at minimum temperature and the efficiency\nshowed a decline of 15% compared to that of October. Consequently,\nthis investigation leads to a conclusion that the increase in temperature and\nhumidity together is found to have a negative effect on the efficiency whereas\nthe increase in irradiance and wind speed showed an improvement in the\noutput power of the polycrystalline solar cells....
This work reports on a computational analysis of how a modified perovskite cell can work as\na refractometric sensor by generating surface plasmon resonances at its front surface. Metal-dielectric\ninterfaces are necessary to excite plasmonic resonances. However, if the transparent conductor\n(ITO) is replaced by a uniform metal layer, the optical absorption at the active layer decreases\nsignificantly. This absorption enhances again when the front metallic surface is nanostructured,\nadding a periodic extruded array of high aspect-ratio dielectric pyramids. This relief excites surface\nplasmon resonances through a grating coupling mechanism with the metal surface. Our design\nallows a selective absorption in the active layer of the cell with a spectral response narrower than\n1 nm. The photo-current generated by the cells becomes the signal of the sensor. The device employs\nan opto-electronic interrogation method, instead of the well-known spectral acquisition scheme.\nThe sensitivity and figure of merit (FOM) parameters applicable to refractometric sensors were\nadapted to this new situation. The design has been customized to sense variations in the index of\nrefraction of air between 1.0 and 1.1. ....................................
As-doped polycrystalline ZnTe layers grown by metalorganic chemical vapor deposition\n(MOCVD) have been investigated as a back contact for CdTe solar cells. While undoped ZnTe films\nwere essentially insulating, the doped layers showed significant rise in conductivity with increasing\nAs concentration. High p-type carrier densities up .........................
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