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Journal of Thermal Science 2025年第1期34卷 24-33页

作者： LIN Yongjie zhang cancan WU Yuting zhang Yi LU Yuanwei Key Laboratory of Heat Transfer and Energy Conversion National User-Side Energy Storage Innovation Research and Development CenterBeijing University of TechnologyBeijing 100124China

Numerical simulations of the flow and heat transfer characteristics of four shell-and-tube molten salt electric heaters with different perforation rates was ***-and-tube electric heaters have the same geometry and tube arrangement,and all of them use single segmental baffles,but there exist four different baffle openings(φ),i.e.,0%,2.52%,4.06%,and 6.31%.The results indicated that the reasonable baffle opening could significantly reduce the shell-side pressure drop,effectively decreasing the shell-side flow dead zone *** can eliminate the local high-temperature phenomenon on the surface of electric heating tubes,but the heat transfer coefficient is slightly *** perforated schemes significantly reduce shell-side pressure drop compared to the baseline solution without open *** particular,the φ=6.31% scheme exhibits the optimal performance among all the schemes,with a maximum reduction of up to 50.50% in shell-side pressure drop relative to the unopened holes *** heat transfer coefficient is the highest for φ=0%,exhibiting a range of5.26% to 5.73%,5.14% to 5.99%,and 7.31% to 8.54% higher than φ=2.52%,4.06%,and 6.31%,respectively,within the calculated *** composite index h/(Δp)^(1/3)was higher for all open-hole solutions than that for the unopened-hole *** best overall performance was for φ=6.31%,which improved the composite index by15.29%to 17.18%over the unopened-hole solution.

关键词： molten salt electric heater perforated baffles heat transfer

Molecular Dynamics Simulation on the Interaction of R290 and POE Lubricants

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Journal of Thermal Science 2025年第02期 555-566页

作者： XING Meibo DENG Qiao zhang cancan zhang Ning Beijing Engineering Research Center of Sustainable Energy and Buildings School of Environment and Energy EngineeringBeijing University of Civil Engineering and Architecture MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of Technology

In this work,the interactions between the environmentally friendly refrigerant propane(R290) and Polyol Ester(POE) including solubility parameters,diffusion coefficients,binding energies,and radial distribution functions were investigated using molecular dynamics(MD).Specifically,the effect of chain length of Pentaerythritol esters(PEC) as the representative component of POE on the interaction of PEC/R290 was *** solubility parameters difference exhibits the PEC and R290 are more easily miscible as increasing chain length of PEC,and there is plateau as the chain lengths is above 8 *** addition,it was also found that solubility parameters are various for the isomers due to the different spatial ***,the presence of PEC would reduce the diffusion coefficient of R290 in the mixed system of R290/lubricant with the reduction of20% on *** is also found that van der Waals forces are dominant in the R290/PEC *** PEC molecules start to be bound to the H atoms of R290 at the first neighbor shell layer with a radius of 0.219 ***,the molecular simulation model of POE22 considering various actual components was innovatively *** results showed that the solubility of R290 with typical POE lubricant is affected by the composition and proportions of based oil and additives.

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An Update Review on Performance Enhancement of Refrigeration Systems Using Nano-Fluids

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Journal of Thermal Science 2022年第4期31卷 1236-1251页

作者： XING Meibo zhang Hongfa zhang cancan Beijing Engineering Research Center of Sustainable Energy and Buildings School of Environment and Energy EngineeringBeijing University of Civil Engineering and ArchitectureBeijing 100044China MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University ofTechnologyBeijing 100124China

Considering the issues of energy saving and environment protection,the performance of refrigeration systems requires to be *** recent years,nano-fluids have attracted greatly attention from the researchers due to their outstanding thermal *** this work,the published investigations on the preparation and characterization of nano-fluids have been discussed at ***,the key thermo-physical properties of nano-fluids,such as thermal conductivity,viscosity,specific heat and density have been ***,the performance enhancements in different types of refrigeration systems by using nano-fluids have been *** is concluded that nano-fluids as refrigerant,lubricant or secondary fluid have wide potential application in refrigeration systems.

关键词： nano-fluids performance enhancement nano-refrigerant nano-lubricant nano-secondary fluid refrigeration

Plasmonic metal/semiconductor hybrid nanomaterials for solar to chemical energy conversion

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Journal of Energy Chemistry 2021年第12期30卷 40-53,I0002页

作者： cancan zhang Yuying zhang Wei Xie Key Lab of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage CenterCollege of ChemistryNankai UniversityTianjin 300071China School of Medicine Nankai UniversityTianjin 300071China

Plasmonic nanomaterials are sources of light,heat and electrons at nanometer *** the outstanding performance in harvesting and converting solar energy under visible light irradiation,hybrid nanomaterials with plasmonic activity have recently emerged as a new class of advanced *** of the enhanced charge-separation at hybrid interfaces,the hybrids usually exhibit higher catalytic activity compared with their monometallic ***,we review the recent progress on synthesis of plasmonic hybrid nanomaterials and their applications in photocatalysis,including H2 production,CO_(2) reduction and N2 *** hope this review will give systematic and valuable reference on plasmonic solar to chemical energy conversion.

关键词： Plasmon Hybrid nanomaterials Energy conversion

A Theoretical Criterion for Evaluating the Thermodynamic Effectiveness of Regenerators in Organic Rankine Cycle Systems

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Journal of Thermal Science 2021年第6期30卷 2027-2036页

作者： LEI Biao zhang cancan zhang Yeqiang WU Yuting WANG Wei MA Chongfang MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China School of Energy and Power Engineering Zhengzhou University of Light IndustryZhengzhou 450002China

Organic Rankine Cycle(ORC)is a promising technology for converting low or medium temperature heat into *** order to improve the thermodynamic efficiency of ORC systems,adding a regenerator to the system has been widely ***,this needs additional pipes and devices and they will produce additional pressure *** both the contributions of the regenerator and the power losses caused by additional pressure drop,a theoretical criterion for evaluating the thermodynamic effectiveness of adding a regenerator was proposed by means of mathematic and thermodynamic *** core of the criterion is a new concept named Critical Pressure Drop produced by the Regenerator(CPDR).A negative value of CPDR indicates that adding a regenerator will not contribute to the thermodynamic efficiency of ORC systems in any *** effective regenerator needs a positive value of CPDR,and requires that the value of additional pressure drop produced by introducing the regenerator should be smaller than *** influences of evaporation temperature,condensation temperature,expander efficiency,regenerator effectiveness and working fluids on CPDR were also *** was found that lower evaporation temperature or using working fluids with higher critical temperature tends to reduce the value of CPDR.

关键词： Organic Rankine Cycle regenerator additional pressure drops

Aversatile β-cyclodextrin functionalized silver nanoparticle monolayer for capture of methyl orange from complex wastewater

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Chinese Chemical Letters 2020年第2期31卷 539-542页

作者： Jun Liu cancan zhang Shaoxuan zhang Huajiang Yu Wei Xie Key Lab of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage CenterCollege of ChemistryNankai UniversityTianjin 300071China College of Chemistry State Key Laboratory of Elemento-Organic ChemistryNankai UniversityTianjin 300071China

The toxic organic dye contaminants in wastewater are extremely harmful to the *** enhanced Raman scattering(SERS) is a technique with high sensitivity and chemical specificity which fulfills the requirements for monitoring dye contaminants in ***,as one of the common dye contaminants,methyl orange(MO) has very weak affinity to metallic surfaces and is difficult to be detected by SERS at low ***,a new type of SERS substrate with Ag nanoparticle monolayer functionalized by mono-6-deoxy-6-thio-β-cyclodextrin(β-CD-SH) was prepared to efficiently capture and detect MO in wastewater with a limit of detection of 5×10^(-7) mol/*** hydrophobic cavity of β-CD is responsible for the efficient trap and enrichment of MO on the Ag NPs surface,achieving a strong SERS signal of MO at low concentrations and at different pH *** study provides new insight into designing a well-performed adsorbent for the capture and detection of organic contaminants.

关键词： Dye contaminants Methyl orange SERS Cyclodextrin Wastewater

Flexible Operation Mode of Coal-fired Power Unit Coupling with Heat Storage of Extracted Reheat Steam

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Journal of Thermal Science 2022年第2期31卷 436-447页

作者： WEI Haijiao LU Yuanwei YANG Yanchun zhang cancan WU Yuting LI Weidong ZHAO Dongming MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China China Huaneng Group Clean Energy Research Institute Co.Ltd Beijing 102209China

In order to provide more grid space for the renewable energy power,the traditional coal-fired power unit should be operated flexibility,especially achieved the deep peak shaving *** this paper,a new scheme using the reheat steam extraction is proposed to further reduce the load far below 50%rated *** flexible operation modes of increasing power output mode and reducing fuel mode are proposed in heat discharging process.A 600 MW coal-fired power unit with 50%rated power is chosen as the research *** results show that the power output is decreased from 300.03 MW to 210.07 MW when the extracted reheat steam flow rate is 270.70 t·h^(-1),which increases the deep peak shaving capacity by 15%rated *** deep peak shaving time and the thermal efficiency are 7.63 h·d^(-1)and 36.91%respectively for the increasing power output mode,and they are 7.24 h·d^(-1)and 36.58%respectively for the reducing fuel *** increasing power output mode has the advantages of higher deep peak shaving time and the thermal efficiency,which is recommended as the preferred scheme for the flexible operation of the coal-fired power unit.

关键词： coal-fired power unit flexible operation deep peak shaving extracted reheat steam heat storage

Comparative Study on Heat Flux and Temperature Distribution Performance of Linear Fresnel Collector Based on Uniformity Index

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Journal of Thermal Science 2022年第3期31卷 678-688页

作者： WU Yuting QIAN Li zhang cancan HAN Songtao SUN Hexin NIU Junnan CHENG Yingkun SANG Shengjie MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijing 100124China Jizhong Energy Jingxing Mining Group Co.Ltd. Shijiazhuang 050000China Hebeijingkuang New Energy Technology Co.Ltd. Shijiazhuang 050100China

Linear Fresnel collector system as main solar energy collecting technology is widely *** secondary reflector has significant influence on the heat flux distribution on the linear Fresnel *** this work,the heat flux and temperature distribution on linear Fresnel collector is compared with different secondary reflectors of simple trapezoidal concentrator,segmented parabolic concentrator and compound parabolic concentrator under varied incident ray *** uniformity index is applied to evaluate the Linear Fresnel reflector system heat flux distribution *** results show that the value of uniformity index increases with the increasing of incident ray *** compound parabolic concentrator has the highest value of uniformity index compared with simple trapezoidal concentrator and segmented parabolic concentrator in this *** highest value of uniformity index is 0.8137 with compound parabolic *** work provides effective and practical guide to design and evaluate the secondary reflector in linear Fresnel reflector system.

关键词： heat flux distribution linear Fresnel secondary concentrator uniformity index

In situ monitoring of Suzuki-Miyaura cross-coupling reaction by using surface-enhanced Raman spectroscopy on a bifunctional Au-Pd nanocoronal film

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Chinese Chemical Letters 2023年第4期34卷 449-452页

作者： cancan zhang Yonglong Li Aonan Zhu Ling Yang Xiaomeng Du Yanfang Hu Xian Yang Feng zhang Wei Xie Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Tianjin Key Lab of Molecular Recognition&BiosensingHaihe Laboratory of Sustainable Chemical TransformationsRenewable Energy Conversion and Storage CenterCollege of ChemistryNankai UniversityTianjin 300071China

Surface-enhanced Raman spectroscopy(SERS), a powerful surface vibrational spectroscopic technique, is ideally suited for in situ monitoring the chemical transformations occurred at surfaces and/or *** in situ SERS monitoring, a platform integrated both plasmonic and catalytic activity is a prerequisite. Here, we fabricate a bifunctional Au-Pd nanocoronal film for in situ SERS monitoring Suzuki-Miyaura cross-coupling reaction. This excellent bifunctional substrate leads to the coupling of high catalytic activity with a strong SERS effect at the center of two adjacent Au cores and shows fine reproducibility and stability of SERS signals. During investigating the Suzuki reaction with in situ SERS, we found two distinct catalytic kinetic processes resulted from two disparate catalytic sites on a Au-Pd nanocoronal. Comparing with conventional analytical techniques, this work provides a novel approach for studying Suzuki reactions at surfaces and/or interfaces with in situ SERS.

关键词： Suzuki-Miyaura cross-coupling reaction Au-Pd SERS In situ monitoring Kinetics

Boosting Plasmonic Hot Electron Utilization for Visible-Light Photocatalysis Using Polarized Ag-TiO_(2) Nanoparticles

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CCS Chemistry 2023年第8期5卷 1908-1916页

作者： Yonglong Li Linfeng Yu Ying Wang cancan zhang Yangxuan Gao Teng Wang Wei Xie Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Tianjin Key Laboratory of Biosensing and Molecular RecognitionHaihe Laboratory of Sustainable Chemical TransformationsRenewable Energy Conversion and Storage CenterCollege of ChemistryNankai UniversityTianjin 300071

Plasmonic hot electrons have long been regarded as a promising energy source for inducing chemical ***,because of the mismatch between the electron cloud of reactant molecules and the hot-electron gas of metal nanoparticles(NPs),the highly localized and short-lived hot electrons are dif-ficult to utilize in bulk synthesis when the reactant molecules do not have a strong affinity for the metal ***,we propose the concept of polarized nanocatalysts to mimic chemical polarity at the nanometer *** plasmonic photorecycling conditions,the rationally designed asymmetric Ag-TiO_(2) hybrid NPs enable six-electron reduction of molecules in bulk *** hot-electron-driven reaction does not require a conventional hydrogen or hydride reducing *** a proof-of-concept,one-pot photocatalytic syntheses of amides,such as paracetamol,using nitro reactants were *** provides a new opportunity to enable challenging multielectron transformations in organic chemistry.

关键词： plasmonic catalysis polarized nanoparticles hot electrons multielectron transfer amide synthesis