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2021 12th International Renewable Energy Congress (IREC)最新文献

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Effect of impurity addition on the dry reforming of methane reaction in the presence of CoxNiyMgzAl2 catalysts CoxNiyMgzAl2催化剂存在下杂质添加对甲烷干重整反应的影响
Pub Date : 2021-10-26 DOI: 10.1109/IREC52758.2021.9624901
M. Chaghouri, S. Hany, F. Cazier, L. Tidahy, C. Gennequin, E. Abi-aad
The composition of a biogas produced in a landfill was analyzed using gas chromatography. Major compounds, such as CH4 and CO2, and minor compounds, such as volatile organic compounds (VOCs), were identified and quantified. Cobalt and nickel based materials synthesized using coprecipitation method were tested in the dry reforming of methane reaction (DRM). Toluene was selected as model molecule for VOCs. 12h-stability tests at 750°C were performed in the presence or absence of toluene in order to mimic the effect of volatile organic compounds found in biogas. Several concentrations of toluene were used during the DRM tests. The effect of this molecule on the catalytic performance was determined. Used samples were characterized by thermal analysis (DTA-TG) and scanning electron microscopy (SEM). Results showed that even though the presence of toluene did affect the activity and selectivity of the catalyst to the DRM reaction, it did not cause the direct deactivation of the material. It was concluded that the valorization of biogas in the DRM reaction is possible even before it has completed its upgrading process.
采用气相色谱法分析了垃圾填埋场沼气的组成。主要化合物(如CH4和CO2)和次要化合物(如挥发性有机化合物(VOCs))被识别和量化。用共沉淀法合成了钴基和镍基材料,并在甲烷反应(DRM)中进行了干法重整实验。选择甲苯作为VOCs的模型分子。在750°C下,在甲苯存在或不存在的情况下进行12h稳定性试验,以模拟沼气中发现的挥发性有机化合物的影响。在DRM试验中使用了几种浓度的甲苯。测定了该分子对催化性能的影响。用热分析(DTA-TG)和扫描电镜(SEM)对样品进行了表征。结果表明,甲苯的存在虽然会影响催化剂对DRM反应的活性和选择性,但不会直接导致材料失活。由此得出结论,即使在完成升级过程之前,沼气在DRM反应中也有可能增值。
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引用次数: 0
Improving the Efficiency of Switched Reluctance Motors of Electric Cars Using Sigmoid Torque Sharing Function 利用Sigmoid转矩共享功能提高电动汽车开关磁阻电机效率
Pub Date : 2021-10-26 DOI: 10.1109/IREC52758.2021.9624935
Abdullah Albarghouthi, Mohammad Alsharayrai, A. Harb
in this study, based on Genetic Algorithm (GA) a novel approach for torque ripple minimization for the switched reluctance motors was presented, the fitness function is assigned with three objectives, firstly to eliminate the backward torque generation, and to optimize the commutation angles in order to minimize the torque ripples and copper losses, the torque sharing functions (TSF) depends on the turn-on-, turn-off-, rise-, fall- angles, the lagging of the motor current rise and fall, due to its salient pole shaped structure requires different treatment, as they are not always at unity, angles are to be optimized to achieve the best outcome in the commutation region of operation.
本文提出了一种基于遗传算法的开关磁阻电机转矩纹波最小化方法,适应度函数具有三个目标:首先消除反向转矩产生,优化换相角以最小化转矩纹波和铜损耗,转矩共享函数(TSF)取决于导通、关断、上升、下降角、电机电流上升和下降的滞后;由于其凸极形状的结构需要不同的处理,因为它们并不总是统一的,因此需要优化角度,以在操作换向区域获得最佳效果。
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引用次数: 0
On Grid Techno- Economic Evaluation of pv/wind Hybrid system for A Compound building: Simulation Study 某复合建筑光伏/风能混合系统的电网技术经济评价:仿真研究
Pub Date : 2021-10-26 DOI: 10.1109/IREC52758.2021.9624836
A. Elbreki, N. A. Adbulsalam, F. Mohamed
This study aimed to design and sizing a compound building includes a motel, gas station, and a mosuqe as case study located at Teka town 35km from the west of Libya, Benghazi. The loads were estimated virtually based on 24 hours of working hour. Load total load of electric application for [motel, mosque, and gas station] were found to be 18.3 kW. A hybrid system designing of the proposed compound building was carried out. The economic analysis of the hybrid system was taken in our consideration. At the same time, the wining scenario which produce less CO2 emissions to preserve the environment was evaluated. In order to achieve the aims of this study, three different gird’s tariff scenarios, ranges between (A=20, B=25, and C= 30 cents) were simulated. From the obtained results we can conclude that the wining case has the lowest NPC and COE. Therefore, scenario (A) was the cheapest configuration for 25 years of the project life cycle among the other scenarios which has 1kw wind turbines with solar energy of 15. 1kw.This configuration has COE of 0.149 USD/kWh and NPC value of 79,803 USD when Grid sales tariff is 20 cents/ KWh.
本研究旨在设计和确定一个包括汽车旅馆、加油站和清真寺的复合建筑,作为案例研究,该建筑位于距利比亚西部班加西35公里的Teka镇。负荷是根据24小时的工作时间来估计的。[汽车旅馆、清真寺、加油站]用电总负荷为18.3千瓦。对拟建的复合建筑进行了混合系统设计。我们考虑了混合动力系统的经济分析。同时,对减少二氧化碳排放以保护环境的获胜方案进行了评估。为了实现本研究的目的,模拟了三种不同的电网关税情景,范围为(A=20, B=25, C= 30美分)。从所得结果可以看出,获胜案例的NPC和COE最低。因此,方案(A)是25年项目生命周期中最便宜的配置,其他方案有1kw的风力涡轮机,太阳能为15。1千瓦。当电网销售电价为20美分/千瓦时,该配置的COE为0.149美元/千瓦时,NPC值为79,803美元。
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引用次数: 0
Discrete time model of DC-DC buck converter based on the Euler forward difference 基于欧拉正演差分的DC-DC降压变换器离散时间模型
Pub Date : 2021-10-26 DOI: 10.1109/IREC52758.2021.9624880
B. S., A. A., B. M, Sbita L.
in this paper, a discrete time model of the DC-DC buck converter is conceived. In fact, based on the continuous DC-DC buck converter model, the discrete one is deduced by using the Euler forward difference approach.The validity of the obtained discrete model is testified on simulation by using matlab/simulink environment.
本文建立了DC-DC降压变换器的离散时间模型。实际上,在连续DC-DC降压变换器模型的基础上,采用欧拉正演差分法推导了离散型降压变换器模型。在matlab/simulink环境下,通过仿真验证了所得到的离散模型的有效性。
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引用次数: 2
An AC/DC switch mode power supply based on half bridge DC/DC converter for low power applications 一种基于半桥DC/DC变换器的低功耗交流/直流开关电源
Pub Date : 2021-10-26 DOI: 10.1109/IREC52758.2021.9624938
Harith Al-Badrani, Y. Ameen, Mohamed N. Abdul Kadir
This paper deals with the analysis, simulation and implementation of an SMPS based on a two-stage AC-DC converter. The first-stage uses a single-phase uncontrolled bridge rectifier, and the second-stage is based on a DC-DC half-bridge converter. The presented SMPS output-voltage can be controlled in the range of 10-15V to supply a DC-load to supply up to 250W to the load. power rating up to 250W. A detailed mathematical analysis is presented to show converter performance in (CCM). The effect of inserting the flux reset capacitor between the primary of the high frequency converter and the two power transistors center point are taken in to account in this work. The SMPS is modeled in MATLAB Simulink, and the results are cross-checked against the analytical representation as well as the results of a developed microcontroller-based prototype model, resulting in a complete validation.
本文研究了基于两级交直流变换器的SMPS的分析、仿真和实现。第一级采用单相无控桥式整流器,第二级采用DC-DC半桥式变换器。所提出的SMPS输出电压可以控制在10-15V范围内,为负载提供高达250W的直流负载。额定功率高达250W。对CCM中变换器的性能进行了详细的数学分析。在本工作中考虑了在高频变换器初级电路和两个功率晶体管中心点之间插入磁通复位电容器的影响。在MATLAB Simulink中对SMPS进行了建模,并将结果与分析表示以及基于微控制器的原型模型的结果进行了交叉验证,从而得到了完整的验证。
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引用次数: 0
Bypass Diode Faults Analysis of Multi Crystalline PV Module Based on Electrical Characteristics Behaviors 基于电特性行为的多晶光伏组件旁路二极管故障分析
Pub Date : 2021-10-26 DOI: 10.1109/IREC52758.2021.9624819
Olfa Bel Hadj Brahim Kechiche, Marwa Abiadh
In this paper, analytical equations of the single diode bishop model are implemented on the Matlab/Simulink software in order to develop the model of a photovoltaic panel, firstly. Then, a 150Wp PV module established by using the proposed Matlab/Simulink model with series connection is employed to represent the I–V and P–V characteristics and subsequently analyze their comportment for different bypass diode faults. Finally, physical interpretations of each fault type are detailed.
本文首先在Matlab/Simulink软件上实现了单二极管主教模型的解析方程,建立了光伏板的模型。然后,利用所提出的Matlab/Simulink串联模型建立一个150Wp PV模块,对其I-V和P-V特性进行表征,分析其在不同旁路二极管故障情况下的对应关系。最后,详细介绍了每种断层类型的物理解释。
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引用次数: 1
Transient analysis of a variable-mode adsorption chiller 变模吸附式冷水机的瞬态分析
Pub Date : 2021-10-26 DOI: 10.1109/IREC52758.2021.9624924
Ahmad A. Alsarayreh, A. Al-Maaitah, M. Attarakih, H. Bart
Adsorption cooling has high potential as a technology for saving energy and reducing greenhouse gas emissions. It can also be driven through low-temperature levels obtained from solar thermal collectors or waste heat. However, it has low relative performance at high ambient or re-cooling temperature as compared to its performance at lower temperatures. Adsorption cooling has a high heat rejection rate from the condensation and adsorption processes; due to this reason, it becomes difficult to maintain a low re-cooling temperature with an air-cooled adsorption system. Therefore, the concept of variable-mode adsorption chiller was proposed to evaluate the chiller output at different re-cooling temperatures. For performance evaluation of the proposed adsorption chiller, transient re-cooling temperature conditions were employed along with four proposed modes; single-stage mode, short and medium recovery modes, and variable mode which represent a combination of these modes. In addition, the cycle stability during shifting from one mode to another was investigated. The modeling results showed that the proposed chiller needs one cooling cycle to reach the steady-state after shifting from single-stage mode to mass recovery mode and three cooling cycles while shifting from mass recovery mode to single-stage mode. Furthermore, the variable-mode chiller has the highest averaged annual cooling capacity compared to other modes at Dubai weather conditions, while the single-stage has the highest averaged annual COP followed by variable, short and medium mass recovery modes respectively at same conditions.
吸附冷却作为一种节约能源和减少温室气体排放的技术具有很高的潜力。它也可以通过从太阳能集热器或废热获得的低温水平来驱动。然而,与在较低温度下的性能相比,它在高环境温度或再冷却温度下的相对性能较低。吸附冷却具有冷凝和吸附过程的高废热率;由于这个原因,风冷吸附系统很难保持较低的再冷却温度。因此,提出了变模式吸附制冷机的概念,以评估不同再冷温度下的制冷机输出。为了对所提出的吸附式制冷机进行性能评价,采用了四种模式下的瞬态再冷却温度条件;单阶段模式,短、中恢复模式,以及代表这些模式组合的可变模式。此外,还研究了从一种模式转换到另一种模式时的周期稳定性。建模结果表明,该制冷机从单级模式切换到质量回收模式后需要1个冷却周期达到稳态,从质量回收模式切换到单级模式需要3个冷却周期。此外,在迪拜天气条件下,与其他模式相比,变模式制冷机的年平均制冷量最高,而在相同条件下,单级制冷机的年平均COP最高,其次是变、短、中质量回收模式。
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引用次数: 0
The effect of the phase change material on the hydric response of a building during the summer season of Tunisia 相变材料对突尼斯夏季建筑水力响应的影响
Pub Date : 2021-10-26 DOI: 10.1109/IREC52758.2021.9624838
Nour Lajimi, Noureddine Boukadid
The best way to reduce the energy needs of a building is to reduce losses and therefore improve the thermal insulation of the walls. The study of the thermal inertia of buildings is a subject of major interest. Thermal insulation can significantly modify the thermal inertia of the building and is one of the solutions to improve the energy efficiency of the envelope. Ceiling insulation is considered the most effective solution given the amount of solar radiation to which this wall is exposed in summer. The aim of this work is to study the one-dimensional heat and mass transfer through a ceiling wall containing micro-encapsulated PCM (phase change concrete) under realistic climatic conditions based on meteorological data. This work relates to a numerical study based on the nodal method to predict the influence of the thickness of the MCP on the temperature of the interior air of a multilayer wall and on the energy consumption to maintain the desired set temperature in a building and the effect of the phase change on the hydric response for the summer period associated with the composite building envelope.
减少建筑物能源需求的最佳方法是减少损耗,从而改善墙壁的隔热性能。建筑热惯性的研究是一个重要的研究课题。隔热可以显著改变建筑的热惯性,是提高围护结构能源效率的解决方案之一。天花板隔热被认为是最有效的解决方案,因为这堵墙在夏天会受到大量的太阳辐射。本研究的目的是基于气象资料,在实际气候条件下,研究微封装相变混凝土(PCM)天花板墙的一维传热传质。这项工作涉及一项基于节点方法的数值研究,以预测MCP厚度对多层墙体内部空气温度的影响,对维持建筑物所需设定温度的能耗的影响,以及与复合建筑围护结构相关的夏季期间相变对水力响应的影响。
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引用次数: 0
Optimal energy management of smart grid connected residential PV power system 智能并网住宅光伏发电系统的最优能量管理
Pub Date : 2021-10-26 DOI: 10.1109/IREC52758.2021.9624892
Hasanain H. Shakir, M. A. Zdiri, F. B. Salem
This paper presents a method of optimization energy management in the electrical distribution grids. Where is described the types of household loads, concerning the current and requirement of demand. The proposed techniques, the benefit of IoT, the renewable sources with automation control through wireless telecommunication, the schedule of time operating for electrical appliances, demand, supply and time of peak load which lead to obtaining results in an economic cost to reduce the electric bill and saving energy consumed. Optimal energy management and the efficacy of the distribution power system at the smart home is represented as a modern power system model. Adding to the application of the MATLAB program is supported the results acquired.
提出了一种配电网能量优化管理方法。其中描述了家庭负荷的类型,涉及到目前的需求和要求。所提出的技术,物联网的好处,通过无线通信自动化控制的可再生能源,电器运行时间计划,需求,供应和高峰负荷时间,从而获得经济成本的结果,以减少电费和节省能源消耗。智能家居中配电系统的最佳能源管理和效能表现为一种现代电力系统模型。添加到应用的MATLAB程序是支持得到的结果。
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引用次数: 2
Energy Efficiency of Integrating Phase Change Materials in the Roof of Building in Tunisia 突尼斯建筑屋顶集成相变材料的能效研究
Pub Date : 2021-10-26 DOI: 10.1109/IREC52758.2021.9624906
Nour Lajimi, Noureddine Boukadid
The object of this work is to study and simulate the effect of integration of a layer of micro-encapsulated PCM (modified PCM materials / concrete can be considered as two-phase materials made up of reference concrete and particles. PCM) on the thermal behavior of a building and improve the thermal inertia of the ceiling of a building. This work relates to a numerical study based on the nodal method to predict the effect of the integration of a layer of PCM on the thermal behavior as well as on the reduction of energy consumption for the summer and winter period associated with the building to composite envelope.
本工作的目的是研究和模拟一层微胶囊化的PCM(改性PCM材料/混凝土)的集成效果,可以认为是由参考混凝土和颗粒组成的两相材料。PCM)对建筑热性能的影响,并改善建筑天花板的热惯性。这项工作涉及一项基于节点方法的数值研究,以预测一层PCM的集成对热行为的影响,以及与复合围护结构相关的夏季和冬季能耗的减少。
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引用次数: 0
期刊
2021 12th International Renewable Energy Congress (IREC)
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