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Journal of Thermal Science 2024年第2期33卷 501-508页

作者： LI Weiwei MIAO Qi ZHANG Yelong DING Hongliang YANG Sa LAI Yuan FENG Daili DING Yulong JIN Yi TAN Linghua School of Chemistry and Chemical Engineering Nanjing University of Science&TechnologyNanjing210094China National Special Superfine Powder Engineering Research Center Nanjing University of Science and TechnologyNanjing210094China Nanjing Jinhe Energy Material Co. LtdNanjing210047China School of Chemical Engineering University of BirminghamBirminghamB152TTUK School of Energy&Environmental Engineering University of Science and Technology BeijingBeijing100083China

In this paper,a novel ternary eutectic salt Na_(2)CO_(3)-Li_(2)CO_(3)-LiF was designed and investigated for concentrated solar power(CSP).The FactSage software was used to predict the composition and eutectic point of Na_(2)CO_(3)-Li_(2)CO_(3)-*** microstructure,thermophysical properties,and thermal stability of eutectic salts were experimentally measured using various analytical *** a mass ratio of 57%:32%:11%,the eutectic salt exhibited excellent thermal storage properties with a fusion enthalpy of 413 J/g and a melting point of 426.8℃.The excellent thermal stability of the eutectic salt was reflected by a weight loss of only 0.8% at 600℃.

关键词： phase change materials ternary eutectic salt latent heat thermal stability

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latent heat of TB18 Titanium Alloy during β to α Phase Transition by DSC and First-Principles Methods

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Acta Metallurgica Sinica(English Letters) 2023年第11期36卷 1844-1856页

作者： Yan-Di Jia Shuo Cao Ying-Jie Ma Sen-Sen Huang Feng-Ying Qin Shao-Qiang Li Wei Xiang Qian Wang Qing-Miao Hu Bo Li Jia-Feng Lei Jing Xie Xiang-Hong Liu Rui Yang School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China AVIC The First Aircraft InstituteXi’an710089China Western Superconducting Technologies Co.Ltd.Xi’an710018China China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd.Deyang618000China

The phase transition of titanium alloys is sensitive to the heat-treatment procedure,accompanied with the latent heat induced by phase ***,the latent heat during phase transition of titanium alloy has not been systematically studied,which may result in the gap between designed and actual temperature of the sample and affect the final mechanical *** this work,DSC(differential scanning calorimetry)and first-principles simulate methods were used to study theβ→αphase transition process of TB18(Ti–Al-Mo-V-Cr-Nb-Fe system)metastableβtitanium alloy,especially to reveal the influence of the heating rate on latent *** ratio of latent heat to endothermic heat of the sample during temperature rising was introduced to interpret the effect of latent heat to actual *** ratio of latent heat to endothermic heat at 1℃/min is about 15 to 20 times higher than that at 10℃/*** higher ratio indicates that the latent heat of phase transition has a more significant effect on the temperature,which is related to the temperature range of phase transition and theαvolume *** with the heating rate of 1℃/min,theβ→αphase transition takes place at higher temperature and the volume fraction ofαis smaller at 10℃/***,there is a precipitation free zone between grain boundaryαand intragranularαand the distribution ofαlamellae is heterogeneous when the heating rate is 10℃/*** of the experimental and theoretical results suggest that the latent heat of phase transition is the main cause of the temperature fluctuation during heat-treatment *** work has guiding significance for microstructure optimization affected by temperature,to achieve the desired mechanical properties.

关键词： High-strength titanium alloys latent heat Phase transition Differential scanning calorimetry(DSC) First-principles calculation

latent heat Prediction of Nano Enhanced Phase Change Material by ANN Method

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Energy Engineering 2022年第3期119卷 847-861页

作者： Farzad Jaliliantabar Rizalman Mamat Sudhakar Kumarasamy College of Engineering Department of Mechanical EngineeringUniversiti Malaysia PahangKuantan26300Malaysia Automotive Engineering Centre Universiti Malaysia PahangPekan26600Malaysia School of Mechanical Engineering Ningxia UniversityNingxia750000China Faculty of Mechanical and Automotive Engineering Technology Universiti Malaysia PahangPekan26600Malaysia Energy Center Maulana Azad National Institute of TechnologyBhopal462003India

Thermal characteristics of phase change material(PCM)are important in design and utilization of thermal energy storage or other *** have great latent heat but suffer from low thermal ***,in recent years,nano particles have been added to PCM to improve their thermophysical properties such as thermal *** of this nano particles on thermophysical properties of PCM has been a question and many experimental and numerical studies have been done to investigate *** intelligence-based approach can be a good candidate to predict thermophysical properties of nano enhance PCM(NEPCM).Then,in this study an artificial neural network(ANN)has been developed to predict the latent heat of the NEPCM.A comprehensive literature search was conducted to acquire thermal characteristics data from various NEPCM to train and test this artificial neural network *** different types of Nano particle and paraffin based PCMs were used in ANN *** most important properties which are used as the input for the developed ANN model are NP size,density of NP,latent heat of PCM,density of PCM,concentration and latent heat of NEPCM in the range of 1-60 nm,100-8960 kg/m^(3),89.69-311 kJ/kg,760 to 1520 kg/m^(3),0.02-20 wt%and 60.72-338.6 kJ/kg,*** output variable was latent heat of *** result indicates that the ANN model can be applied to predict the latent heat of nano enhanced PCM *** correlation coefficient of the created model was *** result shows ability of ANN to predict the latent heat of NEPCM.

关键词： NEPCM ANN latent heat prediction

Long-term daily dataset of surface sensible heat flux and latent heat release over the Tibetan Plateau based on routine meteorological observations

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Big Earth Data 2022年第4期6卷 480-491页

作者： Anmin Duan Senfeng Liu Wenting Hu Die Hu Yuzhuo Peng State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(Lasg) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing China College of Earth Science University of Chinese Academy of SciencesBeijingChina Tropical Marine Science Institute National University of SingaporeSingapore

As the main components of the atmospheric heat source/sink over the Tibetan Plateau(TP),up-to-date spatiotemporal fields of surface sensible heat flux and latent heat release by precipitation are vital for investigating the local land-atmosphere interaction and the effect of the thermal forcing of the TP on global weather and *** study recalculates the long-term daily dataset of surface sensible heat flux and latent heat release of condensation over the TP based on 293 routine meteorological observations,with the latest date being 31 December *** stations have adequate and valid records during the period 1981-2019,and the results for 1951-1980 are also calculated if the observations are ***,a brief evaluation of the climatology and long-term variation during 1981-2019 is *** providing the most continuous and longest set of observational surface sensible heat flux and latent heat release of condensation data over the TP with a high degree of credibility,this new dataset will support research concerning the multi-timescale variation of diabatic heating/cooling over the TP and its remote *** is openly available on the LASG data-sharing platform(http://***/TPSHLH/).

关键词： Atmospheric heat source/sink dataset Tibetan Plateau sensible heat latent heat

Study on release rate of latent heat in Czochralski silicon growth

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Rare Metals 2006年第Z2期25卷 51-54页

作者： REN Bingyan YANG Jiankun LI Yanlin LIU Xiaoping WANG Minhua School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China

The pulling rate in czochralski silicon (CZSi) growth is important for reducing the cost of solar cell. In this paper, double-heater, heat shield and composite argon duct system were introduced in the Ф450 mm hot zone of a Czochralski furnace. The pulling rate under different thermal system was recorded in experiments. Argon flow and temperature fields were simulated by finite element method(FEM). Experimental results and numerical simulation indicate that double-heater and composite argon duct system can enhance obviously the release rate of latent heat. In Φ 200 mm Czochralski silicon (CZSi) growth, average pulling rate can increase from 0.6 mm·min-1 in the conventional hot zone to 0.8 mm·min-1 in the modified hot zone.

关键词： CZSi latent heat double-heater heat shield numerical simulation

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Quantitative phase-field simulation of the entire solidification process in one hypereutectic Al–Si alloy considering the effect of latent heat

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Progress in Natural Science:Materials International 2021年第3期31卷 428-433页

作者： Kai Wang Lijun Zhang Institute for Energy and Climate Research IEK-2 Forschungszentrum Jülich State Key Laboratory of Power Metallurgy Central South University

The multi-phase-field(MPF) model coupled with reliable CALPHAD thermodynamic/atomic mobility descriptions, appropriate faceted anisotropy and key experimental validation is employed to perform the quantitative simulation of the microstructure evolution of the hypereutectic Al-16 wt%Si alloy during solidification. By considering the effect of latent heat released during the eutectic phase transformation in the simulation, the appropriate entire solidification sequence is obtained. All the characteristics in the as-cast microstructure can be nicely reproduced, including the primary(Si) encircled by the second primary(Al) halo, and the coupled eutectic grains appearing at the Liquid/(Al) interface rather than Liquid/(Si) interface. Moreover, three types of growth patterns of eutectic(Si) with different lengths are distinguished according to the distance between primary(Si)and the nucleation position of eutectic(Si). Furthermore, the evaluated ratios of width to length for 50 eutectic(Si) grains due to the MPF simulation are in good agreement with the experimental data. The quantitative phasefield simulation of the entire solidification process of the hypereutectic Al-16 wt%Si alloy in the present work is anticipated to pave the way for revealing the grain refinement mechanism in hypereutectic Al–Si alloys in the future studies.

关键词： Al–Si hypereutectic Alloy Solidification Phase-field simulation latent heat Eutectic (Si)

A New Model for the Characterization of Frozen Soil and Related latent heat Effects for the Improvement of Ground Freezing Techniques and Its Experimental Verification

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Fluid Dynamics & Materials Processing 2019年第1期15卷 63-76页

作者： Daoming Shen Hua Si Jinhong Xia Shunqun Li Xinxiang University 191 Jinsui AvenueXinxiang453000China Tianjin Chengjian University 26 Jinjing RoadTianjin300384China

The correct determination of thermal parameters,such as thermal conductivity and specific heat of soil during freezing,is the most important and basic problem for the construction of an appropriate freezing *** this study,a calculation model of three stages of soil temperature was *** the unfrozen and frozen stages,the specific temperatures of dry soil,water,and ice are *** to the principle of superposition,a calculation model of unfrozen and frozen soils can be *** by a laboratory experiment,the latent heat of the adjacent zone was calculated for the freezing stage based on different water contents in the temperature *** the latent and specific heat of water,ice,and particles were calculated via superposition of the weight percentage content.A calculation model of the specific heat of the freezing stage was built,which provides both guidance and theoretical basis for the calculation of the specific heat of frozen soil.

关键词： Freezing construction latent heat frozen soil specific heat

Role of Composite Phase Change Material on the Thermal Performance of a latent heat Storage System: Experimental Investigation

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Journal of Harbin Institute of Technology(New Series) 2020年第1期27卷 44-51页

作者： Jasim Abdulateef Ahmed F.Hasan Mustafa S.Mahdi Department of Mechanical Engineering University of DiyalaBaquba 32001Iraq Department of Chemical Engineering University of DiyalaBaquba 32001Iraq

Paraffin wax is a perfect phase change material(PCM)that can be used in latent heat storage units(LHSUs).The utilization of such LHSU is restricted by the poor conductivity of *** the present work,a metal foam made of aluminium with PCM was used to produce a composite PCM as a thermal conductivity technique in PCM⁃LHSU and water was used as heat transfer fluid(HTF).An experimental investigation was carried out to evaluate the heat transfer characteristics of LHSU using pure PCM and composite *** study included time⁃dependent visualization of the PCM during the melting and solidification ***,a thermocouple network was placed inside the heat storage to record the temperature profile during each *** showed that better performance could be obtained using composite PCM⁃LHSU for both melting and solidification *** melting time of composite PCM⁃LHSU was about 83%faster than that of a simple PCM⁃LHSU,and the percentage decreasing in the solidification time was about 85%due to the provision of metal foam.

关键词： phase change material metal foam latent heat composite PCM

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Pathways to carbon neutrality in the built environment: Phase change materials

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Green Carbon 2024年第2期2卷 197-204页

作者： Wenzhu Lin Xiaoxue Yao Wen Zhao Yiru Pu Steven Wang Department of Mechanical Engineering City University of Hong KongHong KongChina

Phase change materials(PCMs)are increasingly capturing the spotlight in the realm of building design and construction owing to their capacity to absorb and release thermal energy throughout phase *** review provides a comprehensive overview of PCMs,outlining their properties and applications in improving energy efficiency,comfort,and sustainability in *** delves into various types of PCMs,discussing their selection criteria,integration methods,and their impact on indoor climate and energy *** exploration covers both passive and active PCM systems across diverse building components,including implications for walls,roofs,windows,and floors,and integrated heating,ventilation and air conditioning(HVAC)and solar energy ***,the review addresses challenges associated with PCM implementation in building applications while considering future prospects in this field.

关键词： Phase change material Building latent heat Energy storage Energy saving

Investigation of phase-change materials for interior temperature regulation in public transport

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Clean Energy 2022年第1期6卷 178-192页

作者： Md Nahidul Islam Md Nahid Hossain Dewan HasanAhmed Department of Mechanical and Production Engineering Ahsanullah University of Science and Technology141-142 Love RoadTejgaon Industrial AreaDhakaBangladesh

Regulating the indoor temperature of public transport on hot sunny days is a prime concern,as both the external and internal heat sources play an active role in heat *** studies have been carried out on a bus model using sodium sulphate decahydrate as a phase-change material(PCM)that is placed in between the ceiling and the *** are conducted on a sunny day and also for different cases of external(300-W surface heater)and internal(25-W light bulb)heat *** results show that PCM,in the presence of an external heat source,can help to keep the indoor temperature lower and delay the time period for increasing the temperature by absorbing heat during the phase *** the other hand,the presence of the internal heat source contributes to a detrimental effect on the indoor temperature,which gradually increases with the elapse of *** the combination of the external and internal heat sources,it is found that the internal heat source plays a dominating factor to raise the indoor *** is revealed from the experimental results that a 12.7-mm single layer and a single PCM are not enough to counter the internal heat of 25 W unless the thickness of the PCM layer is increased to delay the increase in the indoor *** additional PCM layer with a lower melting temperature could be placed at the inner portion of the ceiling to have effective thermal-energy storage by absorbing the substantial heat gain from the internal heat sources.

关键词： latent heat sodium sulphate decahydrate phase-change material transportation thermal-energy storage