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1. Study on Influencing factors of power supply efficiency of photoelectric building based on SEM | |||
Li Meng,Zhang Haibo | |||
Energy Science and Technology 06 January 2023 | |||
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Abstract:Energy saving and carbon reduction in buildings is the key link for our country to achieve "carbon peak" and "carbon neutral" goals, and the important way to develop high-quality and large-scale application of photovoltaic power generation. Through the collection and collation of relevant literature, this paper systematically analyzes the factors affecting the power supply efficiency of photoelectric buildings, and uses Likert scale to compile and distribute questionnaires. Based on the structural equation model, the data were collected and screened by SPSS22 and AMOS26 software. The data were processed and a model was established to identify the main factors affecting the energy supply efficiency of photovoltaic buildings. The model results show that the first-order indicators that should be paid attention to are module conversion efficiency and mechanical load, whose first-order weight coefficient is 0.254, indicating that the module power attenuation loss and dust occlusion loss are relatively serious in the process of converting light energy into electric energy. The energy conversion efficiency of photovoltaic buildings can be improved by strengthening the control of key factors. The research on the influencing factors of the power supply efficiency of photoelectric buildings is of great significance to achieve the goal of "carbon peak" and "carbon neutrality" | |||
TO cite this article:Li Meng,Zhang Haibo. Study on Influencing factors of power supply efficiency of photoelectric building based on SEM[OL].[ 6 January 2023] http://en.paper.edu.cn/en_releasepaper/content/4758784 |
2. Study on the identification of natural energy potential and the suitability of heating technology in chongqing rural area | |||
Weng Daiyin,Liu Meng | |||
Energy Science and Technology 10 March 2020 | |||
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Abstract:This paper investigates the distribution characteristics of natural energy such as solar energy, outdoor air temperature and humidity in Chongqing rural area. Through the experimental test, the suitability of the heating system (solar water heating system, air source heat pump heating system, solar hybrid air source heat pump heating system) in Chongqing rural area was analyzed. The research shows that the annual total solar radiation in Chongqing is between 3200 and 3900 MJ/m2, and the solar water heating system is greatly affected by the weather. On the sunny days in winter, the average temperature of hot water rises by 21 C, which can\'t meet the use requirements. The average outdoor temperature of Chongqing rural area is 7.9 C, the average relative humidity is above 87%, and the air source heat pump heating system has a COP range of 1.5-2.0, which is not efficient. The energy efficiency ratio of the solar hybrid air source heat pump heating system can reach 3.21, which is far greater than the performance of the air source heat pump when it is separately heating, and overcomes the shortcomings of the solar water heating system whose performance is greatly affected by the weather. Therefore the solar hybrid air source heat pump heating system is more suitable for heating in Chongqing rural area. | |||
TO cite this article:Weng Daiyin,Liu Meng. Study on the identification of natural energy potential and the suitability of heating technology in chongqing rural area[OL].[10 March 2020] http://en.paper.edu.cn/en_releasepaper/content/4751094 |
3. An endurable watt-power Bi2Te3-based terrestrial radioisotope thermoelectric generator harvesting decay energy for IoT-based sensors in extreme environments | |||
Deng Wei,Wang Xuejian,Pan Xiaodong,Zhang Shixu,Ding Jingjie,Li Gongping | |||
Energy Science and Technology 02 February 2020 | |||
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Abstract:Radioisotope thermoelectric generator (RTG), a technology that mostly adopted in space missions, is regarded as a promising technology to power the Internet of Things-based (IoT) sensors, especially those in extreme environments, for its merits of stability, maintenance-free and long-life. This paper studied RTG\'s application on earth and fabricated an endurable watt-power Bi2Te3-based terrestrial RTG. By employing the finite element analysis, an octagonal cylinder-shaped substituted electric heater was designed to have a higher surface temperature and better temperature uniformity while the fin-shaped radiators to dissipate heat at their optimal heat-sinking capacity. In the experiment part, this terrestrial RTG was tested to have an output power of 4.64 W and an open-circuit voltage of 27.2 V. Also, an optimal electric connection instruction between each thermoelectric (TE) converter was proposed from the experiment. Whereafter, based on the structure used in the experiment part, the finite element analysis was carried out to optimize the geometry of TE converters, the terrestrial RTG possessed an enhanced output power of 10.5 W with an open-circuit voltage of 57.8 V. Ultimately, this paper proposed important guidance for the design and optimization of an endurable terrestrial RTG, which could provide some prospects for its application on IoT-based sensors. | |||
TO cite this article:Deng Wei,Wang Xuejian,Pan Xiaodong, et al. An endurable watt-power Bi2Te3-based terrestrial radioisotope thermoelectric generator harvesting decay energy for IoT-based sensors in extreme environments[OL].[ 2 February 2020] http://en.paper.edu.cn/en_releasepaper/content/4750596 |
4. The electrochemical performances of 904L stainless steel as negative grid for lead-acid batteries | |||
LI Yuan,ZHU Wei | |||
Energy Science and Technology 23 May 2017 | |||
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Abstract:Herein, 904L stainless steel has been successfully prepared using as the negative grid for lead-acid batteries. The morphologies and composites are investigated by field-emission scanning electron microscopy (FESEM), energy dispersive X-ray spectrometer (EDS) and powder X-ray diffraction (XRD). In addition, the electrochemical properties of the negative electrode are carried out in a three-electrode. Lead-acid batteries based on lead plate as the anode and lead-coated 904L as the cathode exhibits excellent specific capacity (179.5 mAh/g) and good cycling stability owing to high electrical conductivity and corrosion resistance of the 904L stainless steel. These results suggest that 904L stainless steel is a potential grid for lead-acid batteries. | |||
TO cite this article:LI Yuan,ZHU Wei. The electrochemical performances of 904L stainless steel as negative grid for lead-acid batteries[OL].[23 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4735894 |
5. Numerical analysis of Flow-structure interactions with the gravity effect for Rim-generator turbines | |||
CHEN Funan,CHEN Qifan,WANG Zhengwei | |||
Energy Science and Technology 17 May 2017 | |||
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Abstract:For a Rim-generator turbine with a shaft in transversal arrangement, the operating head is low, and the runner diameter is large. Therefore, the fluid field in a runner would be influenced by the gravity. In this paper, the gravity effect on the fluid flow and the flow-induced stress of the runner are investigated by numerical simulations. The full-body channel including the runner, the inlet pipe and the outlet pipe has been established. Firstly, the gravity influence on the fluid flow through the channel is predicted for this turbine. Secondly, with one-way fluid-structure interaction (FSI) method, the finite element analysis of stresses on the blades is performed. The stress distribution on other parts of the turbine is also calculated in this part. Results show that the pressure field in the runner is influenced by the gravity, and the maximum stresses are located at the transition between the blade and the shroud. The maximum stress on the structure is far smaller than the yield stress. | |||
TO cite this article:CHEN Funan,CHEN Qifan,WANG Zhengwei. Numerical analysis of Flow-structure interactions with the gravity effect for Rim-generator turbines[OL].[17 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4730359 |
6. Straight flow turbine runner hole-shape rim seal design based on CFD | |||
CHEN Qifan,CHEN Funan,WANG Zhengwei | |||
Energy Science and Technology 11 May 2017 | |||
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Abstract:Since its advantages of the straight passageway and large mass-flow ratio, the straight flow turbine has become an important type in the development of low-head hydraulic resource. However, due to the special configuration of its runner, that the runner rim rotating follows the blades, high demands is required on its runner rim seal performance. Rim seal defects restricted the application and development of the straight flow turbine for many years. By redesigning a hole-shape rim seal using the commercial CFD software, this paper discussing the influence of different hole-shape parameters on the rim seal performance by an orthogonal experiment. Through the analysis, the hole-shape rim seal reduce 20% leakage compared with using the plate clearance seal. ????? | |||
TO cite this article:CHEN Qifan,CHEN Funan,WANG Zhengwei. Straight flow turbine runner hole-shape rim seal design based on CFD[OL].[11 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4730434 |
7. Proton conduction in doped ceria-carbonate composite electrolytes | |||
Zhao Yicheng | |||
Energy Science and Technology 30 April 2017 | |||
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Abstract: Doped ceria-carbonate composite is considered as a promising electrolyte for intermediate temperature solid oxide fuel cells. H+ conduction in the composite has attracted much attention in recent years, while its mechanism has not been revealed clearly. In this work, H+ conductivities of samarium doped ceria-carbonate composites with varying composition are measured by a four-probe direct current method. For composites with aggregated carbonate phase, H+ conductivity increases with the rise of carbonate content, while for composites with a more homogeneous distribution of phases, a larger interfacial region means higher H+ conductivity. We propose that H+ conducts through both the molten carbonate phase and the interfacial region. H+ conduction at the interface is influenced by the composition of the ceramic phase. | |||
TO cite this article:Zhao Yicheng . Proton conduction in doped ceria-carbonate composite electrolytes [OL].[30 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4727218 |
8. Oxygen ionic conduction in doped ceria-carbonate composite with a controllable structure | |||
ZHAO Yicheng | |||
Energy Science and Technology 24 April 2017 | |||
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Abstract: Doped ceria-carbonate composite with a high O2- conductivity has been considered as a promising electrolyte for solid oxide fuel cells, while the irregular distribution of its components leads to difficulties in investigating O2- conduction. In this work, samarium doped ceria-(Li0.52Na0.48)2CO3composite electrolyte is synthesized through a sacrificial NiOtemplate- infiltration method.The content and distribution of ceramic and carbonate phasesare controlled by varying the NiO content and the sintering temperature of SDC-NiO composite.Results of direct current four probe measurement show that molten carbonate dominatesO2- conduction in the composite. The tortuosity and inter-particle neck size of ceramic and carbonate phases, instead of the interface, present significant impact on the conductivity of O2-. | |||
TO cite this article:ZHAO Yicheng . Oxygen ionic conduction in doped ceria-carbonate composite with a controllable structure [OL].[24 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4727215 |
9. Thermal decomposition of methyl butenoate: influence of the carbon-carbon double bond | |||
Li Xiaoyu,You Xiaoqing,Chung K.Law | |||
Energy Science and Technology 01 December 2016 | |||
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Abstract:In this work, we explored the influence of the carbon-carbon double bond on the thermal decomposition of short-chain methyl esters, namely methyl 3-butenoate and methyl 2-butenoate, which are isomers with C-C double bond at different locations. The bond dissociation energies and the potential energy surfaces of the decomposition reactions through directly C-C or C-O bond fission and hydrogen transfer bond fission were computed using the G3B3 method. Their rate constants were calculated on the basis of variational transition state theory. Results show that the position of the C=C bond influences significantly the decomposition rates, and the cis conformer of methyl 2-butenoate has the fastest decomposition rate than the trans conformer of methyl 2-butenoate and methyl 3-butenoate. | |||
TO cite this article:Li Xiaoyu,You Xiaoqing,Chung K.Law. Thermal decomposition of methyl butenoate: influence of the carbon-carbon double bond[OL].[ 1 December 2016] http://en.paper.edu.cn/en_releasepaper/content/4711902 |
10. Modeling the characterization of the plus fractions for different petroleum fluids with an improved six-coefficient splitting method | |||
LI Changjun,PENG Yang | |||
Energy Science and Technology 23 May 2016 | |||
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Abstract:Petroleum fluids such as the gas condensate and crude oil system often contain large concentrations of high molecular constituents. When determining the physicochemical properties and phase behavior of petroleum fluids by equations of state, the hydrocarbon heavy fractions should be properly characterized. Although advanced gas chromatographs can be used to analyze the fluid composition, the simple structure molar distribution models are still convenient to characterize the heavy hydrocarbon fractions so that time and money will be saved. To accurately split the plus fraction into a series of single carbon numbers (SCN), generating the mole fraction and the respective molecular weight, an improved six-coefficient splitting model is presented in this study. The model is based on the relationships between the six-coefficient molar distribution function, experimental mole fraction, average molecular weight and SCN data acquired from the literature. The presented model was validated by using the experimental extended fluid component of 20 different petroleum fluids which cover gas condensates and crude oils. The comparison results of the model and four other splitting approaches as Katz method, Pedersen et al. method, Ahmed et al. method and Hosein et al. method, indicate that the improved method is more practical and appropriate for extending different types of petroleum fluids. | |||
TO cite this article:LI Changjun,PENG Yang. Modeling the characterization of the plus fractions for different petroleum fluids with an improved six-coefficient splitting method[OL].[23 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4690689 |
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