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Merrouni A.A.,Solar Green Energy | Moussaoui M.A.,Mohammed 1st University
International Journal of Renewable Energy Research | Year: 2016

This study presents the simulation results of a small rooftop photovoltaic (PV) system with a nominal power of 2kWp under the climate of Oujda city (North East of Morocco) using high quality data measured at ground level for a period of one year. The results show that for an annual global horizontal irradiance of 1891kWh/m2, the system is able to provide a yearly electrical production of 3230.1 kWh for a total load of 1538 hours/year and with a mean system efficiency of 8.6%. Generally, the integration of PV systems for small utility scale in Eastern Morocco and especially in the building is very promising, and the results of this study can help the local political and economical actors in the field of solar energy to develop strategies and programs to enhance the PV integration on buildings.

Srinivasan M.,SSN College of Engineering | Karuppasamy P.,SSN College of Engineering | Ramasamy P.,SSN College of Engineering | Barua A.K.,Solar Green Energy
Electronic Materials Letters | Year: 2016

Numerical modelling has emerged as a powerful tool for the development and optimization of directional solidification process for mass production of multicrystalline silicon. A transient global heat transfer model is performed to investigate the effect of bottom grooved furnace upon the directional solidification (DS) process of multi-crystalline silicon (mc-Si). The temperature distribution, von Mises stress, residual stress and dislocation density rate in multi-crystalline silicon ingots grown by modified directional solidification method have been investigated for five growth stages using finite volume method at the critical Prandtl number, Pr = 0.01. This paper discusses bottom groove furnace instead of seed crystal DS method. It achieves an advanced understanding of the thermal and mechanical behaviour in grown multi-crystalline ingot by bottom grooved directional solidification method. The von Mises stress and dislocation density were reduced while using the bottom grooved furnace. This work was carried out in the different grooves of radius 30 mm, 60 mm and 90 mm of the heat exchanger block of the DS furnace. In this paper, the results are presented for 60 mm radius groove only because it has got better results compared to the other grooves. Also, the computational results of bottom grooved DS method show better performance compared the conventional DS method for stress and dislocation density in grown ingot. [Figure not available: see fulltext.] © 2016, The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.

Hong C.-Y.,National Tsing Hua University | Hsieh T.-Y.,National Tsing Hua University | Wei T.-C.,National Tsing Hua University | Ikegami M.,Toin University of Yokohama | And 2 more authors.
Chemistry Letters | Year: 2015

Introducing spiro-OMeTAD as protecting layer for onto CH3NH3PbI3/TiO2 in a liquid-type perovskite solar cell is found to suppress the degradation of the device efficiently. Evidenced by XRD analysis, the dissolution of onto CH3NH3PbI3/TiO2 is significantly retarded in the presence of spiro-OMeTAD capping layer and consequently the currentvoltage parameter decay is stabilized. © 2015 The Chemical Society of Japan.

Chen Y.-H.,Solar Green Energy | Fang H.-Y.,Solar Green Energy | Yeh C.-M.,Solar Green Energy
Journal of Non-Crystalline Solids | Year: 2011

This paper presents results on Raman scattering and electrical characterizations in a-SiGe:H films prepared by 40 MHz very-high frequency plasma-enhance chemical vapor deposition (VHF-PECVD) technique from various gas mixtures of silane and germane. We found that when GeH4/SiH 4 + GeH4 ratio increases, Raman spectrum results observed that the Si-Si peaks intensity decreases and the Ge-Ge peaks intensity increase, respectively. This can be attributed to incorporation of Ge, an increase disorder in a-SiGe:H film. The conductivity characterizations were shown that when GeH4/SiH4 + GeH4 ratio increases, the deterioration of a-SiGe:H films also increases, which is in agreement with Raman spectrum analysis results. © 2010 Elsevier B.V. All rights reserved.

Abstract Integration of appropriate thermal energy storage system plays a predominant role in upgrading the efficiency of solar thermal energy devices by reducing the incongruity between energy supply and demand. Latent heat thermal energy storage based on phase change materials (PCM) is found to be the most efficient and prospective method for storage of solar thermal energy. Ensuring the thermal reliability of PCM through large number of charging (melting) and discharging (solidification) cycles is a primary prerequisite to determine the suitability of PCM for a specific thermal energy storage applications. The present study explains the experimental analysis carried out on two PCM's namely benzamide and sebacic acid to check the compatibility of the material in solar thermal energy storage applications. The selected materials were subjected to one thousand accelerated melting and solidification cycles in order to investigate the percentage of variation at different stages on latent heat of fusion, phase transition temperature, onset and peak melting temperature. Differential Scanning Calorimeter (DSC) was used to determine the phase transition temperature and heat of fusion upon completion of every 100 thermal cycles and continued up to 1000 cycles. Relative Percentage Difference (RPD%) is calculated to find out the absolute deviation of melting temperature and latent heat of fusion with respect to zeroth cycle. The experimental study recorded a melting temperatures of benzamide and sebacic acid as 125.09 °C and 135.92 °C with latent heat of fusion of 285.1 (J/g) and 374.4 (J/g). The maximum RPD for melting temperature and heat of fusion for benzamide was calculated as 0.02% and -14.83% whereas sebacic acid it was -0.85% and -6.06% upon 1000 thermal cycles. The study revealed that both benzamide and sebacic acid are potential candidates for thermal energy storage due to their superior thermal reliability characteristics even after one thousand thermal cycles. © 2015 Elsevier Ltd.

Moriya Y.,University of Tokyo | Takata T.,Solar Green Energy | Domen K.,University of Tokyo | Domen K.,Solar Green Energy
Coordination Chemistry Reviews | Year: 2013

Hydrogen is considered to be a clean energy carrier alternative to exhaustible resources such as fossil fuels. To facilitate the transition to a hydrogen economy, hydrogen production using renewable energy is an important focus of attention. Splitting water into hydrogen and oxygen using a photocatalyst and sunlight is a potential candidate for future hydrogen production. To utilize sunlight efficiently, photocatalysts must be responsive to visible light with longer wavelengths, which makes up the majority of sunlight. Among transition metal (oxy)nitrides with d0-electronic configurations, there are some photocatalysts with the potential to split water by absorbing light with wavelengths up to ∼600nm. However, overall water splitting has not yet been achieved by these 600nm-class photocatalysts. It is very likely that defects in photocatalysts that are inevitably formed during conventional preparation processes degrade their photocatalytic performance. In this review, we provide a summary of recent progress in the development of visible-light-responsive (oxy)nitride photocatalysts, especially from the aspect of syntheses and post-treatments to obtain high-quality crystals with few defects. © 2013 Elsevier B.V.

Merrouni A.A.,Mohamed 1st University | Merrouni A.A.,Solar Green Energy | Mezrhab A.,University Mohammed Premier | Mezrhab A.,Mohamed 1st University
Sustainable Energy Technologies and Assessments | Year: 2016

This Paper discusses the possibility of installation of large-scale Photovoltaic (PV) power plants in the Eastern region of Morocco. For this purpose, a large database of land exclusion with “high spatial resolution” has been built. This dataset contains all the information about roads, power grid, vegetation, hydrology, protected areas, etc. The solar irradiation map was created by interpolating the global horizontal irradiation (GHI) measurements of ten meteorological stations distributed on the surface of this region. Furthermore, a simulation of the electrical production, as well as, the performance of a 15 MWp Photovoltaic system –similar to the “Lucainena de las Torres” PV project in Almeria, southern Spain– has been conducted under the climate of Oujda city and compared to those calculated under Almeria's climate. Results show that the Eastern region of Morocco receives a high amount of solar irradiation, with a maximum of 1930 kWh.m−2. It also offers a big capability to host PV farms with a surface of 44,863 km2, which represents about 75% of its total surface. Moreover, the electrical generation of a PV plant can be considered as high. For instance, the electricity production of a 15 MWp – if installed in Oujda city– is about 23,4 GWh/a with an annual Performance Ration of 72,3%. © 2016 Elsevier Ltd

Yang H.-J.,Solar Green Energy | Wu C.-L.,Solar Green Energy | Huang C.-F.,Solar Green Energy | Chen C.-H.,Solar Green Energy | And 2 more authors.
2010 International Symposium on Next-Generation Electronics, ISNE 2010 - Conference Program | Year: 2010

For achieving higher performance of amorphous silicon thin film solar cell, the front-contact ZnO:Al is needed to be concerned. In this paper, we focus on how the front contact ZnO:Al influences the a-Si:H thin film solar cell. In order to understand the relationship between the front-contact ZnO:Al and device, we establish a model to simulate how the feature size of the textured ZnO:Al influence the haze and short-circuit current. Moreover we introduce the anneal effect on a-Si:H thin film solar cell. ©2010 IEEE.

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