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solar energy Cell with Rare Earth Film

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Journal of Rare Earths 2004年第z1期22卷 339-341页

作者： Li Baojun Yang Tao Zhou Yao Zhou Meng Fu Xiliang Fu Li Institute of Architecture Technique Research Shenyang Jianzhu Univercity Shenyang 110016 China

The characteristic of the solar energy cell with the rare earth film according to theory of molecular structure was *** sunlight shines, the molecules of the rare earth film can absorb energy of the photon and jump to the excited state from the basic state, and play a role in storing solar *** sunlight do not shine, the electron of the excited state returns to the basic state, the rare earth film can automatically give out light and shine to surface of the solar cell, which can make solar cell continuously generate electric *** rare earth film can absorb direct,scattering sunlight, and increase density of solar energy to reach surface of the solar cell, and play focusing *** rare earth film can bear 350 ~ 500 ℃, which make the solar cell be able to utilize the focusing function *** after luminescence of the rare earth film, it can release again the absorbed solar energy through 1 ~ 8 h, and play a role in storing solar energy; The solar cell with the rare-earth film can generate electricity during night and cloudy days, and remarkably increase efficiency of the solar cell.

关键词： solar energy rare-earth film cell luminescence

solar energy technology and its roles in sustainable development

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Clean energy 2022年第3期6卷 476-483页

作者： Ali O.M.Maka Jamal M.Alabid The Libyan Centre for Research and Development of Sahrain Communities MourzuqLibya Robert Gordon University School of Architecture and Built EnvironmentGarthdee HouseGarthdee RoadAberdeenAB107QBUK Faculty of Engineering Civil&Structural Engineering-University of BradfordBradfordUK

solar energy is environmentally friendly technology,a great energy supply and one of the most significant renewable and green energy *** plays a substantial role in achieving sustainable development energy ***,the massive amount of solar energy attainable daily makes it a very attractive resource for generating *** technologies,applications of concentrated solar power or solar photovoltaics,are always under continuous development to fulfil our energy ***,a large installed capacity of solar energy applications worldwide,in the same context,supports the energy sector and meets the employment market to gain sufficient *** paper highlights solar energy applications and their role in sustainable development and considers renewable energy’s overall employment ***,it provides insights and analysis on solar energy sustainability,including environmental and economic ***,it has identified the contributions of solar energy applications in sustainable development by providing energy needs,creating jobs opportunities and enhancing environmental ***,the perspective of solar energy technology is drawn up in the application of the energy sector and affords a vision of future development in this domain.

关键词： solar energy sustainable development solar energy applications perspective of solar energy

Experimentation of a Membrane-based Concentration Gradient energy Storage of Liquid Desiccant Solutions Driven by solar energy

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Journal of Thermal Science 2021年第5期30卷 1503-1512页

作者： WANG Zanshe LI Ran YIN Fangting WU Yue GU Zhaolin School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an 710049China

solar energy storage is an indispensable and sustainable utilization mode of renewable energy;environment friendly,large-capacity,low heat loss,and long-term storage are critical to improving the integration of solar energy *** thermal energy storage mode cannot achieve long-term storage due to the heat loss even under the excellent thermal insulation *** this work,a solar-powered membrane-based concentration gradient energy storage of liquid desiccant solutions is *** the membrane distillation process driven by solar energy under the right solar radiation conditions,the liquid desiccant solution is concentrated gradually and long-term stored as the concentration gradient *** this end,the measured temperature of solar hot water is in the range of 40°C to 90°C from May to September,2018,in Xi’an,*** then,the LiBr solution(50 wt%),the LiCl solution(35 wt%),and the CaCl_(2)solution(40 wt%)were membrane-based concentrated in the temperature range of 42°C to 63°C,*** results showed that the water vapor pressure difference decides the water vapor transferred across the membrane pores from the liquid desiccant side to the air *** energy storage density of liquid desiccant solutions increases along with the increases in temperature and the membrane ***,when the LiBr,LiCl,and CaCl_(2)solutions are concentrated from 50%to 55%,from 35%to 40%,and from 40%to 45%,separately,the concentration energy storage density is 245 kJ/kg,350 kJ/kg,and 306 kJ/kg,which is equivalent to or even higher than ice storage *** to the two independent closed cycle of the liquid desiccant solution and air,the liquid desiccant solution’s concentration gradient energy storage can be long-term stored environment-friendly without any insulation measures.

关键词： solar energy membrane concentration concentration gradient energy energy storage liquid desiccant

Power Generation Enhancement in a solar energy and Biomass-Based Distributed energy System using H_(2)O/CO_(2)Hybrid Gasification

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Journal of Thermal Science 2024年第5期33卷 1657-1671页

作者： WU Haifeng LYU Yan WANG Ruixiang XU Rongji QU Wanjun LIU Qibin Beijing Engineering Research Center of Sustainable energy and Buildings Beijing University of Civil Engineering and ArchitectureBeijing 100044China Guangdong Provincial Key Laboratory of Distributed energy Systems School of Chemical Engineering and Energy TechnologyDongguan University of TechnologyDongguan 523808China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China

A new solar energy and biomass-based distributed energy system using H_(2)O/CO_(2)hybrid gasification is proposed,and their complementarity to enhance the system's energy efficiency is investigated and *** the system,concentrated solar energy is used to provide heat for biomass gasification;two gasifying agents(H_(2)O and CO_(2))are adopted to enhance syngas yields,and the produced solar fuel is further burned for power production in a combined cycle *** show that CO share in gasification products is remarkably increased with the increment of CO_(2)/H_(2)O mole ratio caused by the boudouard reaction with the consumption of fixed carbon,while the H_(2)share is decreased;the optimal solar-to-fuel efficiency,27.88%,is achieved when the temperature and CO_(2)/H_(2)O mole ratio are 1050℃and 0.45,*** emission reduction rate of CO_(2)in the system under design conditions is reduced by 2.31%compared with that using only H_(2)O *** annual power production of the system is increased by 1.39%,and the thermodynamic and environmental performances are significantly ***,an economic assessment is conducted to forecast the technical feasibility of the hybrid gasification *** work provides a promising route to improving the thermochemical utilization efficiency of solar energy and solid fuel.

关键词： solar energy biomass hybrid gasification distributed energy system thermodynamics performance

Discussion on the Mechanism of Source Integration between solar energy and Biomass energy with Similar Grades

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Journal of Thermal Science 2021年第5期30卷 1607-1613页

作者： ZHAO Li SU Dandan Key Laboratory of Efficient Utilization of Low and Medium Grade energy(Tianjin University) Ministry of Education of ChinaTianjin300350China

The clean transformation of the China’s energy structure is related to the establishment of China as an energy power in the new world *** multi-energy systems based on renewable energy,especially solar energy and biomass energy,have become a popular energy supply ***,there is no clear theoretical guidance for the quantitative source integration of these two types of clean ***,whether the source grades of solar energy and biomass energy are similar in different solar energy modes has not been considered *** at this problem,based on the theory of space-time unity of the special theory of relativity,a new principle of source integration is proposed,and the corresponding mathematical model is *** theoretical calculation of the combination of solar energy and different types of biomass energy is carried *** the premise of the similarity between the source grades of different biomass energy and solar energy,the specific solar energy concentration ratio is *** to this principle,the matching efficiency of the multi-energy integration for rice and corn plants can be increased by 39.2%and 36.2%,respectively.

关键词： special theory of relativity solar energy biomass energy source integration grade

Experimental Analysis of a solar energy Storage Heat Pump System

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Journal of Thermal Science 2021年第5期30卷 1491-1502页

作者： CHEN Haifei LI Guiqiang LING Yueyue FU Jie WANG Yunjie YANG Jie JIANG Lyulin ALI Badiei ZHANG Yang School of Petroleum Engineering Changzhou UniversityChangzhou 233016China School of Engineering University of HullHull HU67RXUK School of Aeronautics and Astronautics Purdue UniversityWest Lafayette 47907USA

This paper introduces a novel solar-assisted heat pump system with phase change energy storage and describes the methodology used to analyze the performance of the proposed system.A mathematical model was established for the key parts of the system including solar evaporator,condenser,phase change energy storage tank,and *** parallel to the modelling work,an experimental set-up of the proposed solar energy storage heat pump system was *** experimental data showed that the designed system is capable of meeting cold day heating demands in rural areas of Yanbian city located in Jilin province of *** day-time operation,the solar heat pump system stores excess energy in the energy storage tank for heating purposes.A desired indoor temperature was achieved;the average coefficient of performance of solar heat pump was identified as 4.5,and the system showed a stable performance throughout the *** night-time operation,the energy stored in the storage tank was released through a liquid-solid change of phase in the employed phase-change *** this way,the provision of continuous heat for ten hours was ensured within the building,and the desired indoor air conditions were achieved.

关键词： solar energy heat pump energy storage energy saving thermal performance

NUMERICAL SIMULATION OF ICE CONTROL EFFECT OF solar energy ON TIBETAN CHANNELS

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Journal of Hydrodynamics 2007年第3期19卷 342-348页

作者： AN Rui-dong CHEN Ming-qian LI Ran Banjiuciren SHI Yun-qiang State Key Laboratory of-Hydraulics and Mountain River Engineering Sichuan University Chengdu 610065 China Rikaze Water Conservancy Institute of Tibet Rikaze 857000 China Tibtan Weather Bureau Lasha 850000 China

With the Tanghe Diversion Channel in Tibet as an example, the theoretical study on the ice control effect of the solar sacks was conducted based on the previous study. The numerical simulation method was adopted and a one-dimensional numerical model for ice crystal in diversion channels in high-altitude cold regions was developed in this article. The heat transfer through the air-water interface and the mass transfer between ice and water were considered in the model. The model was validated by the field observation data on the diversion channel of the Tanghe Hydropower Station. The results show that the ice control effect of the solar sacks is obvious in the channel with large mass flow rate in the high-altitude cold regions.

关键词： solar energy solar sack ice control diversion channel numerical simulation

Effect of pore size and porosity distribution on radiation absorption and thermal performance of porous solar energy absorber

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Science China(Technological Sciences) 2019年第12期62卷 2213-2225页

作者： XIE Tao XU KaiDi YANG BoLun HE YaLing Insinute of Industrial Catalysis Schoo of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'an 710049.China Key Laboratory of Thermo Fluid Science and Engineering of Minisiry of Education Xi'an Jiaotong UniversiyXi'an 710049China

In this paper, experimental and numerical study were both conducted to investigate the effect of pore size and porosity distribution on radiation absorption and thermal performance of porous solar energy absorber. Ultraviolet-visible-near infrared(UV-Vis-NIR) spectrophotometer was used to measure the transmittance of porous media to reflect its radiation absorption capabilities. Numerical model was established based on the assumption of thermal nonequilibrium condition as well as using P1 model to consider the radiation heat transfer. The UV-Vis-NIR spectrophotometer measurement showed that:(1) With smaller pore size, the spectral transmittance of the porous media would be lower and the solar radiation absorption would be better;(2)Among the materials with different pore size distributions, pore-size-decreased combo and pore-size-increased combo have almost equal absorption coefficient which are higher than that of uniform structure. Numerical simulation demonstrated that:(3)For materials with different pore size distributions, pore-size-decreased structure has the best radiation absorption due to its ability of maximizing the volumetric absorption effect, which is agreed with the UV-Vis-NIR spectrophotometer experimental results;(4) For materials with different porosity distributions, porosity-gradually-increased structure has the highest mean fluid/solid temperatures because it can utilize the enhanced convective/conductive heat transfer to improve the overall thermal performance of porous receiver;(5) Porous structure with pore-size-decreased distribution and porosity-gradually-increased distribution has the best thermal performance of which the mean temperatures of fluid/solid phases are the highest among all the studied cases.

关键词： solar energy porous receiver thermal performance pore size distribution porosity distribution

From sawdust waste to high-value hierarchical ceramics-based phase change materials: Efficient dual functional thermal and solar energy storage

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Science China(Technological Sciences) 2023年第9期66卷 2625-2636页

作者： LIU XiangLei WEI PeiDong LUO QingYang XU Qiao WANG JianGuo LV ShuShan TIAN Yang YAO HaiChen XUAN YiMin School of energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Integrated energy Institute Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Latent heat thermal energy storage(LHTES) technology is gaining extensive attention due to its capability to balance supply and demand mismatch in solar energy utilization. However, phase change material as the core of storing latent heat still suffers from low thermal conductivity and poor shape stability, which severely restricts its practical application. Here, an eco-friendly strategy for achieving high-performance dual functional thermal and solar energy storage is proposed via turning wood processing waste into high-value hierarchical porous SiC ceramic-based composite phase change materials. The porosity of prepared porous SiC skeletons is highly adjustable from 59.4% to 90.2%, overcoming low porosity limitations of traditional wood materials and enabling tunable energy storage density for various applications. High thermal conductivity is achieved by benefiting from large grains and continuous skeletons with a value up to 37.93 and 1.87 W/(m K) for porosity of 59.4% and 90.2%, *** stabilities are demonstrated with only slight decreases of thermal conductivity and energy storage density over 1000 cycles and good anti-leakage properties are confirmed due to capillary adsorption forces induced by hierarchical pores. Benefiting from high thermal conductivity and high solar absorptance, fast and efficient solar thermal energy storage is successfully demonstrated. This work provides a new strategy for the high-value utilization of wood processing waste and efficient thermal/solar energy storage.

关键词： sawdust waste silicon carbide ceramics phase change materials thermal energy storage solar energy