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Exergy Analysis of a Solar Vapor Compression Refrigeration System Using R1234ze(E)as an Environmentally Friendly Replacement of R134a

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Frontiers in Heat and Mass Transfer 2024年第4期22卷 1107-1128页

作者： Zakaria Triki Ahmed Selloum Younes Chiba Hichem Tahraoui Dorsaf Mansour Abdeltif Amrane Meriem Zamouche Mohammed Kebir Jie Zhang Laboratory of Biomaterials and Transport Phenomena University of MedeaMedea26000Algeria Laboratoire de Génie des Procédés Chimiques Department of Process EngineeringUniversity of Ferhat AbbasSetif19000Algeria Chemistry Department College of SciencesUniversity of HailHail55223Saudi Arabia Univ Rennes Ecole Nationale Supérieure de Chimie de RennesCNRSISCR–UMR6226RennesF-35000France Laboratoire de Recherche sur le Médicament et le Développement Durable(ReMeDD) Faculty of Process EngineeringUniversity of Salah Boubnider Constantine 3Constantine25000Algeria Research Unit on Analysis and Technological Development in Environment(UR-ADTE/CRAPC) Bou-IsmailTipaza42004Algeria School of Engineering Merz CourtNewcastle UniversityNewcastle upon TyneNE17RUUK

Refrigeration plays a significant role across various aspects of human life and consumes substantial amounts of electrical *** rapid advancement of green cooling technology presents numerous solar-powered refrigeration systems as viable alternatives to traditional refrigeration *** analysis is a key in identifying actual thermodynamic losses and improving the environmental and economic efficiency of refrigeration *** this study exergy analyze has been conducted for a solar-powered vapor compression refrigeration(SP-VCR)system in the region of Gharda颽(Southern Algeria)utilizing R1234ze(E)fluid as an eco-friendly substitute for R134a refrigerant.A MATLAB-based numerical model was developed to evaluate losses in different system components and the exergy efficiency of the SP-VCR ***,a parametric study was carriedout to analyze the impact of various operating conditions on the system’s exergy destruction and *** obtained results revealed that,for both refrigerants,the compressor exhibited the highest exergy destruction,followed by the condenser,expansion valve,and ***,the system using R1234ze(E)demonstrated lower irreversibility compared to that using R134a *** improvements made with R1234ze are 71.95%for the compressor,39.13%for the condenser,15.38%for the expansion valve,5%for the evaporator,and 54.76%for the overall system,which confirm the potential of R1234ze(E)as a promising alternative to R134a for cooling applications.

关键词： Solar cooling vapor compression refrigeration eco-friendly refrigerant thermodynamic losses exergy analysis

The distribution of B-site in the perovskite for a d5-d3 superexchange system studied with Molecular field theory and Monte Carlo simulation

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arXiv

arXiv 2022年

作者： Mo, Jiajun Liu, Min Xu, Shiyu Zhang, Qinghang Shen, Jiyu Xia, Puyue Xia, Yanfang Jiang, Jizhou College of Nuclear Science and Technology University of South China Hengyang421001 China School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of Education Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education Wuhan Institute of Technology Wuhan430205 China

The B-site disorder in the d5 - d3 system of perovskites has been analyzed with molecular field theory and Monte Carlo method. The model is applicable to RFe1−pCrpO3 at any p value. When the saturation magnetization MS and phase transition temperature TP are known, a model can be built to calculate the order or disorder distribution of lattice B-sites. We analyze the case that the Fe-Cr superexchange is antiferromagnetic and ferromagnetic coupling respectively. The simulation result shows that the theoretical calculation formula is suitable for the calculation of different B-site distribution. Through the simulation, we find that when the x and y are large, the system will appear obvious long-range order. The DM interaction has a certain influence on the saturation magnetization. Via calculation, we found that the distribution states of Fe and Cr do not always conform to the uniform distribution but rather exhibit an effect that reduces the Fe-Fe clustering. The establishment of this model offers an explanation for several previously contentious issues, e.g., what is the phase transition temperature range of double perovskite, and why the different phase transition temperatures with the same doping proportion. It provides theoretical guidance for the design of functional materials with an arbitrary phase transition temperature. © 2022, CC BY.

关键词： Monte Carlo methods

Vertically aligned Ni/NiO nanocomposites with abundant oxygen deficient hetero-interfaces for enhanced overall water splitting

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Science China Chemistry 2022年第10期65卷 1885-1894页

作者： Hongxia Wang Meiyan Cui Gaoliang Fu Jiaye Zhang Xingyu Ding Irene Azaceta Matthew Bugnet Demie M.Kepaptsoglou Vlado K.Lazarov Victor Ade la Peña O’Shea Freddy E.Oropeza Kelvin H.L.Zhang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Henan Provincial Key Laboratory of Nanocomposites and Applications Institute of Nanostructured Functional MaterialsHuanghe Science and Technology CollegeZhengzhou 450006China Department of Physics University of YorkHeslingtonYorkYO105DDUK SuperSTEM Laboratory SciTech Daresbury CampusDaresbury WA44ADUK School of Chemical and Process Engineering Univeristy of LeedsLeeds LS29JTUK Univ Lyon CNRSINSA LyonUCBLMATEISUMR 551069621 VilleurbanneFrance Photoactivated Processes Unit IMDEA Energy InstituteParque Tecnológico de MóstolesAvda.Ramón de la Sagra 328935 MóstolesMadridSpain

The design of heterostructured transition metal-based electrocatalysts with controlled composition and interfaces is key to increasing the efficiency of the water electrolysis and the elucidation of reaction *** this work,we report the synthesis of well-controlled vertically aligned Ni/NiO nanocomposites consisting of Ni nanoclusters embedded in NiO,which result in highly efficient electrocatalysts for overall water *** show that such a high catalytic efficiency toward both the hydrogen evolution reaction(HER)and the oxygen evolution reaction(OER)originates from a synergetic effect at Ni/NiO interfaces that significantly reduces the energy barrier for water dissociation,and favours the formation of reactive H*intermediates on the Ni side of the interface,and OH_(ads) on the NiO side of the interface.A study of water chemisorption based on near-ambient pressure photoelectron spectroscopy indicates that the abundant hetero-interfaces in Ni/NiO nanocomposite promote the dissociation of water with a three-fold increase in the surface concentration of OH_(ads) compared with pure *** functional theory calculations indicate that Ni/NiO interface leads to the reduction of the water dissociation energy barrier due to a high concentration of oxygen vacancies at NiO side of the interface,whereas the formation of highly active metallic Ni sites with an optimal value of Gibbs free energy of H*(ΔG_(H*)=−0.16 eV)owes to a favourable adjustment of the electron energetics at the interface,thus accelerating the overall electrochemical water splitting.

关键词： water splitting hydrogen evolution reaction electronic structure heterostructure vertically aligned nanocomposites

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ORGANIC process research & development 2023年第2期27卷 233-237页

作者： Bandichhor, Rakeshwar Borovik, A. S. de Bettencourt-Dias, Ana Eastgate, Martin D. Radu, Nora S. Shi, Feng McElwee-White, Lisa API R&D IPDO Dr. Reddy’s Laboratories Ltd. Bachupally Hyderabad Telangana 500090 India Department of Chemistry University of California 1102 Natural Science II Irvine California 92797 United States Department of Chemistry University of Nevada Reno Nevada 89557 United States Chemical Process Development Bristol Myers Squibb 1 Squibb Drive New Brunswick New Jersey 08903 United States DuPont Co. Experimental Station E336 200 Powder Mill Road Wilmington Delaware 19803 United States Research Center of Chiral Functional Heterocycles School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 China School of Petrochemical Engineering Changzhou University Changzhou 213164 China Department of Chemistry University of Florida Gainesville Florida 32611-7200 United States

Heat transfer coefficient on stirring palm fatty acid distillate in a jacketed tank at a dynamic stage

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AIP Conference Proceedings 2024年第1期3073卷

作者： I. Dewa Gede Arsa Putrawan Yona Octavia Adli Azharuddin Antonius Indarto Dendy Adityawarman Chemical Engineering Product Design and Development Research Group Institut Teknologi Bandung Bandung Indonesia Tekno Buana Globalindo Company Bandung Indonesia Master Program in Chemical Engineering Institut Teknologi Bandung Bandung Indonesia Chemical Reaction Technology and Catalysis Research Group Institut Teknologi Bandung Bandung Indonesia Chemical Engineering Process Design and Development Research Group Institut Teknologi Bandung Bandung Indonesia

Convective heat transfer coefficients for palm fatty acid distillate have been measured in a batch stirred tank. The heat transfer took place at a dynamic stage in jacketed tanks with a working volume of 3.5 and 10.0 liters, at temperature ranging from 60 to 80°C and Reynolds number ranging from 1000 to 6000. The results indicate that the convective heat transfer coefficient is in the range of 230 to 680 W·m-2·°C-1. The data fit well with the existing empirical model and can be expressed as Nu=0.5·Re⅔·Pr⅓ where Nu, Re, and Pr are Nusselt, Reynolds, and Prandtl numbers.

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ORGANOMETALLICS 2023年第3期42卷 177-181页

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JOURNAL OF ORGANIC CHEMISTRY 2023年第4期88卷 1923-1927页

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INORGANIC CHEMISTRY 2023年第6期62卷 2489-2493页

The assessment of Oreochromis mossambicus muscle tissue and the yield performance of Solanum tuberosum in a small-scale sandponics system

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Environmental Science and Pollution research 2025年第23期32卷 13847-13861页

作者： Lukhwareni, Refilwe Nomngongo, Philiswa Nosizo Nibamureke, Uwineza Marie Clementine Moila, Kgaohelo Sekete, Nomhlekhabo Wendy Ndamane, Godfrey Tshokolo Njom, Henry Akum Sithole, Lucky Rudolph, Michael Ngobese, Nomali Ziphorah Department of Zoology University of Johannesburg Johannesburg South Africa Department of Chemical Sciences Faculty of Science University of Johannesburg Johannesburg South Africa Department of Biological Sciences Faculty of Science Engineering & Agriculture University of Venda Thohoyandou South Africa Centre for Ecological Intelligence Department of Electrical and Electronic Engineering Faculty of Engineering and Build Environment University of Johannesburg Johannesburg South Africa Agricultural Research Council Potchefstroom South Africa Department of Agriculture and Rural Development Pietermaritzburg South Africa Unit for Environmental Sciences and Management Faculty of Natural and Agricultural Sciences North-West University Potchefstroom South Africa

Aquaponics, integrating hydroponics and aquaculture in a circular system, offers a promising approach to addressing food and nutrition security while promoting water conservation in South Africa. This technology is a sustainable means of food production that minimizes environmental waste by simultaneously cultivating plants and rearing fish. This study aimed to evaluate the histology of muscle tissue in Mozambique tilapia (Oreochromis mossambicus) and the performance of Irish potato (Solanum tuberosum) in a small-scale sandponics system. Two potato cultivars (Moonlight and Taurus) were planted in a system linked to a 1000-L water tank containing 25 sexually mature Mozambique tilapia from January to June 2023. Fish histology and potato yield performance were assessed to gauge the efficiency of the system and to generate baseline data for future studies. Results showed that tuber production in the sandponics system was comparable to field conditions, with the Moonlight cultivar yielding the heaviest tubers (293–307 g per plant) with a short-oval shape, demonstrating its superior adaptability to this system. Taurus yielded lighter tubers (139–168 g per plant) that were either round or short oval depending on the grow beds used for production. Fish histological analysis revealed a higher prevalence of muscle tissue alterations in the control group compared to the experimental group. However, both groups displayed a similar condition factor (p < 0.05), indicating good overall health. Despite the promising results, the significantly high levels (p < 0.05) of metal accumulation (As, Cu, Mn, and Zn) in the fish were observed, raising concerns about their suitability for human consumption. This study demonstrates that sandponics systems can effectively support potato production with fish maintaining good general health. However, further investigation is needed to mitigate metal accumulation to ensure the safety of fish for consumption.

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