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Annual Optimal Performance Analysis of Micro Heat Pipe PV/T under Different Angles in Northwest China

Journal of Thermal Science 2025年第02期 400-412页

作者： LIU Xiaomin WU Qingbai LI Jinping Vojislav NOVAKOVIC School of energy and Power Engineering Lanzhou University of Technology Collaborative Innovation Center for Supporting Technology of Northwest Low-Carbon Towns Gansu Key Laboratory of Complementary energy System of Biomass and Solar energy Gansu Natural energy Research Institute Department of energy and Process Engineering Norwegian University of Science and Technology

The exploitation of photovoltaic/thermal（PV/T） systems,which facilitate concurrent conversion of solar radiation into electrical and heat energies,presents substantial potential in the solar-abundant northwestern zone of *** investigation endeavors to evaluate the efficacy of a micro heat pipe（M-HP） PV/T system via exhaustive experimental analysis conducted in *** improve the performance of M-HP-PV/T system,a comparison was made between the optimal angles for each day and the entire *** system inside greenhouse exhibited an average photovoltaic conversion efficiency（PCE） and thermal conversion efficiency（TCE） of12.32% and 42.81%.The system of external environment registered average PCE and TCE values of 12.99% and21.08%.To further understand the system's operational results,a mathematical model was constructed through the integration of experimental data,exhibiting good agreement between the simulated outcomes and empirical *** average solar irradiance of daily optimum angle was 728.3 W/m2;the annual optimum angle was 29° with an average solar irradiance of 705.6 W/*** average annual total powers at the optimal angle outside the greenhouse and inside the greenhouse were 448.0 W and 398.7 *** average annual total efficiencies at the optimal angle outside the greenhouse and inside the greenhouse were 40.8% and 56.9%.The total power in the greenhouse was lower by 49.3 W,while total efficiency in the greenhouse was higher by 16.1%.

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Hydrocarbon distribution along the Soapaga thrust(Eastern Cordillera, Colombia) based on new strategic geochemistry samples

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Acta Geochimica 2022年第3期41卷 335-350页

作者： Eduardo A.Rossello Rolando Di Primio Departamento de Ciencias Geologicas Facultad de Ciencias Exactas y NaturalesUniversidad de Buenos AiresCiudad UniversitariaCONICET-IGEBAPabellon II1428 Buenos AiresArgentina lundin energy norway LysakerNorway

The Colombian Eastern Cordillera constitutes a region with potential for finding hydrocarbon reserves that are still under-explored, despite the existence of oil and tar sand production. The intense tectonic deformation affects the petroleum systems and increases exploration challenges due to the different generation, maturation, and entrapment conditions that they produce. Diverse geochemical analysis conducted on strategic samples determines that these are likely generated by the same anoxic marine source rock type. Two source rock samples we investigated are characterized by very different biomarker signals as compared to the tar sands and oil samples. Both samples are dominated by hopanes as compared to tri-and tetracyclic terpanes, with very low(Tibasosa Formation) to no(Chipaque Formation) extended tricyclic terpanes. The Soapaga Thrust, along which the analyzed samples are located, has exercised first-rate regional structural control of the distribution of hydrocarbons in the studied area. The uplift of their Mesozoic hanging wall produces intense erosion with sediment transport towards the eastern footwall forming the present infill of the Arcabuco basin. The kitchen areas were connected with the shallower entrapment sectors where excellent reservoir levels such as the Picacho Formation before the Soapaga Thrust movement. The high degree of biodegradation observed in the Picacho Fm. tar sands support early charge before the Soapaga thrust movement, and severe biodegradation following the thrust movement when hydrocarbon supply from the kitchen was interrupted. This work aims to contribute to a better understanding of the geochemical characteristics of the petroleum systems due to the action of the Soapaga Thrust.

关键词： Hydrocarbon geochemistry Soapaga thrust Eastern Cordillera Colombia

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CO hydrogenation conversion driven by micro-environments of active sites over iron carbide catalysts

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Green energy & Environment 2025年第2期10卷 367-373页

作者： Nan Song Xingxing Li Ebtihal Abograin Wenyao Chen Junbo Cao Jing Zhang De Chen Xuezhi Duan Xinggui Zhou State Key Laboratory of Chemical Engineering East China University of Science and Technology130 Meilong RoadShanghai200237China Department of Chemical Engineering Norwegian University of Science and TechnologyTrondheim7491Norway

Essentially clearing the structure-activity relationship between iron carbide catalysts involving multiple active centers to understand the reaction mechanism of CO hydrogenation conversion process is still a great ***,two main micro-environment factors,namely electronic properties and geometrical effects were found to have an integrated effect on the mechanism of CO hydrogenation conversion,involving active sites on multiple crystal *** Bader charge of the surface Fe atoms on the active sites had a guiding effect on the CO activation pathway,while the spatial configuration of the active sites greatly affected the energy barriers of CO *** the defective surfaces were more conducive to CO activation,the defective sites were not the only sites to dissociate CO,as CO always tended to dissociate in a wider *** synergistic effect of the micro-environment also occurred during the CO conversion *** C atoms on relatively flat configurations were more likely to form methane,while the electronic properties of the active sites could effectively describe the C-C coupling process,as well as distinguish the coupling mechanisms.

关键词： Micro-environment CO hydrogenation conversion Electronic property Local environment Synergistic effect

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Evaluating the Potential of Birch Bark Suberinic Acids for Solid Wood Impregnation

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Journal of Renewable Materials 2025年第1期13卷 147-161页

作者： Daniela Godina Guntis Sosins Aigars Paze Janis Rizikovs Raimonds Makars Andreas Treu Latvian State Institute of Wood Chemistry Biorefinery LaboratoryRigaLV-1006Latvia Norwegian Institute of Bioeconomy Research Department Wood TechnologyHøgskoleveien 8Ås1433Norway

Instead of the traditional linear model of taking,making,and disposing,the circular bio-economy promotes a regenerative *** there is potential to create valuable products like betulin,lupeol,and suberinic acids(SA)from outer birch bark,many industries,such as plywood and pulp,often choose to incinerate substan-tial amounts of leftover birch bark to meet their energy *** highlights the importance of obtaining valu-able products from *** objective of this study was to examine various fractions of SA and assess their potential for wood *** fractions included SA potassium salts in ethanol(SAK-EtOH)and water(SAK-H2O),SA suspension in water(SAS-H2O)and dried SA,which was subsequently diluted in ethanol(DSA-EtOH).There is signiﬁcant potential for utilizing SA in wood treatment formulations as a sustainable alternative to harmful petroleum-derived *** approach not only addresses environmental concerns but also enhances the functionality of wood in construction applications,such as improving impregnation for moisture and fungal *** the solutions tested,the ethanol solution of SA,speciﬁcally DSA-EtOH,showed the highest weight percent gain(WPG)and the greatest leaching *** analysis showed that SA salts in ethanol(SAK-EtOH)and water(SAK-H2O)predominantly consist of low molecular fractions and each process(acidiﬁcation and drying)reduces the low molecular content in the *** suggests that SA polymerizes after drying,making it necessary to dissolve it in ethanol to meet the requirements for *** opti-mization,including adjustments in the concentration of the SA ethanol solution and the curing temperature,is essential to identify the optimal conditions for more in-depth impregnation studies.

关键词： Birch bark suberinic acids solid wood impregnation

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Multi-fluid modeling of density segregation in a dense binary fluidized bed

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Particuology 2012年第1期10卷 62-71页

作者： Zhongxi Chao Yuefa Wang Jana P. Jakobsen Maria Fernandino Hugo A. Jakobsen Department of Chemical Engineering NTNU Trondheim 7491 Norway SINTEF energy Trondheim 7491 Norway Department of energy and Process Engineering NTNU Trondheim 7491 Norway

This paper presents simulation results of the density segregation in a dense binary gas fluidized bed using a multi-fluid model from Chao et al. （2011）, The segregation behavior of two types of particles with approximately same particle diameters and different particle densities was studied and validated using the experimental data from Formisani et al, （2008）. Some detailed information regarding the gas, particle velocity profiles, the distributions of the particle volume fractions and the flotsam-to-total par- ticle volume fraction ratios is presented. The simulation results show that the simulated axial average flotsam-to-total particle volume fraction ratio distribution agrees reasonably with the experimental data of Formisani et al. （2008）. The binary particle velocities are closely coupled though the segregation exists, The segregation behavior and the particle velocity profiles are superficial gas velocity dependent. The number and distribution of particle velocity vortices change dramatically with superficial gas velocity： at a comparatively low superficial gas velocity, the particles mainly segregate axially, and at a comparatively high superficial gas velocity, the particles segregate both axially and radially.

关键词： Fluidized bedBinary flowDensity segregationMulti-fluid modelGranular flow

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Risk of shear failure and extensional failure around over-stressed excavations in brittle rock

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第2期9卷 210-225页

作者： Nick Barton Baotang Shen Nick Barton&Associates OsloNorway CSIRO energy BrisbaneAustralia

The authors investigate the failure modes surrounding over-stressed tunnels in *** lines of investigation are employed:failure in over-stressed three-dimensional(3D) models of tunnels bored under 3D stress,failure modes in two-dimensional(2D) numerical simulations of 1000 m and 2000 m deep tunnels using FRACOD,both in intact rock and in rock masses with one or two joint sets,and finally,observations in TBM(tunnel boring machine) tunnels in hard and medium hard massive *** reason for 'stress-induced' failure to initiate,when the assumed maximum tangential stress is approximately(0.4-0.5)σ_c(UCS,uniaxial compressive strength) in massive rock,is now known to be due to exceedance of a critical extensional strain which is generated by a Poisson's ratio ***,because similar 'stress/strength' failure limits are found in mining,nuclear waste research excavations,and deep road tunnels in norway,one is easily misled into thinking of compressive stress induced *** of this,the empirical SRF(stress reduction factor in the Q-system) is set to accelerate as the estimated ratio σ_(θmax)/σ_c >> *** mining,similar 'stress/strength' ratios are used to suggest depth of *** reality behind the fracture initiation stress/strength ratio of '0.4' is actually because of combinations of familiar tensile and compressive strength ratios(such as 10) with Poisson's ratio(say0.25).We exceed the extensional strain limits and start to see acoustic emission(AE) when tangential stress σθ ≈ 0.4σc,due to simple *** combination of 2D theoretical FRACOD models and actual tunnelling suggests frequent initiation of failure by 'stable' extensional strain fracturing,but propagation in 'unstable' and therefore dynamic *** the case of very deep tunnels(and 3D physical simulations),compressive stresses may be too high for extensional strain fracturing,and shearing will dominate,both ahead of the face and following the *** shallower,the conc

关键词： Fracture propagation Tension Shear Poisson’s ratio Break-out Rock burst Deep tunnels FRACOD model

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Structured NiFe catalysts derived from in-situ grown layered double hydroxides on ceramic monolith for CO_(2) methanation

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Green energy & Environment 2020年第4期5卷 423-432页

作者： Huong Lan Huynh Wakshum Mekonnen Tucho Zhixin Yu Department of energy and Petroleum Engineering University of Stavanger4036 StavangerNorway Department of Mechanical and Structural Engineering and Material Science University of Stavanger4036 StavangerNorway

Monolithic catalysts for CO_(2) methanation have become an active research area for the industrial development of Power-to-Gas *** this study,we developed a facile and reproducible synthesis strategy for the preparation of structured NiFe catalysts on washcoated cordierite monoliths for CO_(2) *** NiFe catalysts were derived from in-situ grown layered double hydroxides(LDHs)via urea *** influence of different washcoat materials,i.e.,alumina and silica colloidal suspensions on the formation of LDHs layer was investigated,together with the impact of total metal *** LDHs were precipitated on the exterior surface of cordierite washcoated with alumina,while it was found to deposit further inside the channel wall of monolith washcoated with silica due to different intrinsic properties of the colloidal *** the other hand,the thickness of in-situ grown LDHs layers and the catalyst loading could be increased by high metal *** best monolithic catalyst(COR-AluCC-0.5M)was robust,having a thin and well-adhered catalytic layer on the cordierite *** a result,high methane yield was obtained from CO_(2) methanation at high flow rate on this structured NiFe *** monolithic catalysts appeared as promising structured catalysts for the development of industrial methanation reactor.

关键词： CO_(2)methanation Structured catalysts In-situ growth Layered double hydroxides Ceramic honeycomb monolith

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Models for lifetime estimation： an overview with focus on applications to wind turbines

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Advances in Manufacturing 2014年第1期2卷 79-87页

作者： Thomas M. Weite Ke-Sheng Wang SINTEF energy Research 7465 Trondheim Norway Department of Production and Quality Engineering NorwegianUniversity of Science and Technology Trondheim Norway

This paper provides an overview of models and methods for estimation of lifetime of technical components. Although the focus in this paper is on wind turbine applications, the major content of the paper is of general nature. Thus, most of the paper content is also valid for lifetime models applied to other technical systems. The models presented and discussed in this paper are classified in different types of model classes. The main classification used in this paper divides the models in the following classes： physical models, stochastic models, data-driven models and artificial intelligence, and combined models. The paper provides an overview of different models for the different classes. Furthermore, advantages and disadvantages of the models are discussed, and the estimation of model parameters is briefly described. Finally, a number of literature examples are given in this paper, providing an overview of applications of different models on wind turbines.

关键词： Lifetime estimation Model classification Wind turbine

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Statistical Models for Condition Monitoring and State of Health Estimation of Lithium-Ion Batteries for Ships

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Journal of Dynamics, Monitoring and Diagnostics 2024年第1期3卷 11-20页

作者： Erik Vanem Qin Liang Maximilian Bruch Gjermund Bøthun Katrine Bruvik Kristian Thorbjørnsen Azzeddine Bakdi DNV GRD HøvikNorway Department of Mathematics University of OsloOsloNorway Fraunhofer ISE FreiburgGermany Corvus energy BergenNorway Corvus energy PorsgrunnNorway

Battery systems are increasingly being used for powering ocean going ships,and the number of fully electric or hybrid ships relying on battery power for propulsion is *** ensure the safety of such ships,it is important to monitor the available energy that can be stored in the batteries,and classification societies typically require the state of health(SOH)to be verified by independent *** paper addresses statistical modeling of SOH for maritime lithium-ion batteries based on operational sensor *** methods for sensor-based,data-driven degradation monitoring will be presented,and advantages and challenges with the different approaches will be *** different approaches include cumulative degradation models and snapshot models,models that need to be trained and models that need no prior training,and pure data-driven models and physics-informed *** of the methods only rely on measured data,such as current,voltage,and temperature,whereas others rely on derived quantities such as state of *** include simple statistical models and more complicated machine learning *** from this exploration will be important in establishing a framework for data-driven diagnostics and prognostics of maritime battery systems within the scope of classification societies.

关键词： battery condition monitoring data-driven analytics diagnostics state of health

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Room temperature aqueous-phase hydrogenation coupling with green hydrogen: Sustainable technologies innovating by efficient Co-CoOx@NC catalyst derived from N-induced interfacial electron rearrangement

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Nano Research 2025年第2期18卷 141-152页

作者： Yue Shen Chun Chen Zidan Zou Wenchao Li Yunxia Zhang Haimin Zhang Zhixin Yu Huijun Zhao Guozhong Wang Key Laboratory of Materials Physics Centre for Environmental and Energy NanomaterialsAnhui Key Laboratory of Nanomaterials and NanotechnologyInstitute of Solid State PhysicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Department of energy and Petroleum Engineering University of Stavanger4036 StavangerNorway Centre for Clean Environment and energy Gold Coast CampusGriffith UniversityQueensland 4222Australia

Utilization and storage are the two main themes of green *** hydrogen-involved system,development of highly active catalysts to achieve catalytic hydrogenation under mild conditions is a prerequisite for coupling with green hydrogen,so that green hydrogen with low outlet pressure can be directly used as a hydrogen *** achieve this aim,we developed a high active Co-CoOx@NC catalyst with metal/metal oxide induced by *** work function and Bader charge calculations reveal that N-doping can induce interfacial electrons rearrangement to form Co-CoOx interface on the surface of Co nanoparticles(NPs).The interface is the dual active sites,where Co plays a role in H_(2) dissociation and CoOx can enhance the adsorption and activation of aldehyde *** from traditional dissimilar metal/oxide interface,the Co-CoOx interface can effectively shorten hydrogen spillover distance and energy barrier,and thus exhibits high catalytic performance in hydrogenation of a variety of bio-derived aldehydes under aqueous-phase and mild reaction conditions that can couple with green hydrogen.

关键词： green hydrogen N-doping dual active sites interface hydrogenation

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