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Natural Convection Melting in a Rectangular heat storage Tank of Carbon Nanotube Dispersed latent heat storage Material

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Journal of Thermal Science 2024年第3期33卷 847-855页

作者： Shin-ichi MORITA Tomoya SAITO Kazunori TAKAI Yasutaka HAYAMIZU Naoto HARUKI Division of Mechanical and Electrical Engineering Kitami Institute of Technology165 Koen-choKitami-shiHokkaido090-8507Japan National Institute of Technology Yonago College4448 Hikona-cyoYonago-shiTottori683-8502Japan Okayama Prefectural University 111 KubokiSoja-shiOkayama719-1197Japan

A dispersion system fluid can convect even if the dispersoid is a solid ***,heat exchange performance can be improved while maintaining fluidity using a material with high thermal conductivity as the *** study presents the melting performance evaluation results of a latent heat storage material with a carbon nanotube(CNT)dispersion system with high thermal conductivity,which enhances the thermal conductivity of the latent heat storage material and does not limit free *** the thermal conductivity and enhancing the melting convection of the heat storage material result in increased latent heat storage *** this study,the thermal conductivity of the latent heat storage material was successfully increased by dispersing CNTs in the *** 0.1%(in mass)of multi-wall CNT(MWCNT)was dispersed in a paraffin-based latent heat storage material,the shear stress increased by 1.5 times at a shear rate of 500 s^(-1),while taking into account the potential effects of convective ***,a latent heat storage experiment was conducted in a rectangular heat storage tank using the CNT dispersion composition ratio as a parameter.A rectangular vessel with a heated vertical surface was used for the latent heat storage *** melting speed was determined by comparing the amount of latent heat stored in a CNT-dispersed latent heat storage material and a single-phase latent heat storage material *** experimental results show that the time required for the latent heat storage material to completely melt in the heat storage tank was the shortest for the single-phase latent heat storage material ***,the fastest melting progress was observed for the sample with 0.02%(in mass)MWCNT content in the melting rate range of up to approximately 40%in the *** results indicate that this phenomenon is caused by the difference in the melting rates in the upper part of the *** generated data are useful for det

关键词： latent heat storage phase change carbon nano tube free convection heat transfer

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Comparison of Thermal Performance between Annular Fins and Longitudinal Fins in latent heat storage Unit

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Journal of Thermal Science 2023年第3期32卷 1227-1238页

作者： ZHU Yuxi QIU Yan School of Energy and Power Engineering Shandong UniversityJi'nan 250061China

As a simple and effective method of heat transfer enhancement,fins are widely used in latent heat storage ***,the choice of annular fins and longitudinal fins has always been *** this paper,the melting process of phase change material(PCM)in annular fins and longitudinal fins latent heat storage units with the same volume is numerically *** ensure the same thermal penetration,three-dimensional spaces occupied with fins are specially controlled to be the *** with finned structures,the effects of natural convection(NC),placement mode and heat transfer fluid(HTF)inlet direction on the melting process are *** results show that the melting time in annular finned structure is always 10%less than that in longitudinal finned structure,which demonstrates the superior of the annular fins in the latent heat storage *** melting time is the shortest in vertical unit with annular fins and HTF inlet at the ***,the correlation formulas of the liquid fraction are proposed in the vertical unit with HTF inlet at the bottom.

关键词： latent heat storage annular fins longitudinal fins natural convection

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Temperature-Dependent Rheological Behaviors of Binary Eutectic Mixtures of Sugar Alcohols for latent heat storage:A Comparative Study with Pure Sugar Alcohols

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Journal of Thermal Science 2021年第6期30卷 2002-2014页

作者： SHAO Xuefeng YANG Sheng CHEN Chenlin FAN Liwu YU Zitao Institute of Thermal Science and Power Systems School of Energy EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China

The temperature-dependent rheological behaviors of five selected binary eutectic mixture sugar alcohols,with great potential for latent heat storage in the range of 353.15 K to 523.15 K,were *** was found that the rheological behaviors of the mixture sugar alcohols depend on those of the pure compounds as well as their molar *** two mixtures of xylitol(75 mol%)+erythritol and erythritol(84 mol%)+d-mannitol behave like pseudoplastic fluids with typical non-Newtonian shear-thinning behaviors,as indicated by the power law index of 0.99(latent heat retrieval.

关键词： binary eutectic mixture dynamic viscosity phase change material rheological behavior sugar alcohol latent heat storage

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High Thermal Conductivity of Carboxyl-rich Carbon/Polyethylene Glycol Composites for Enhanced Photothermal Conversion and latent heat storage

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Chinese Journal of Chemistry 2021年第12期39卷 3245-3254页

作者： Huizhi Yang Yufeng Bai Chunhua Ge Shangyu Li Xiangdong Zhang College of Chemistry Liaoning UniversityChongshan Road No.66ShenyangLiaoning 110036China

Polyethylene glycol(PEG)as phase change material(PCM)and carboxyl-rich carbon(RHTC)with different carboxyl content was introduced to prepare RHTC/PEG *** composites have high thermal conductivity,photothermal conversion ability,and improved the phase change enthalpy of the *** microstructure and thermal properties of the samples were analyzed by various characterization *** promoted the benign growth of PEG crystallinity(110.0%),influenced the phase change enthalpy of PEG,and improved the latent heat storage capacity of *** non-leakage loading of PEG in the composites can be as high as 97 wt%,and the actual phase change enthalpy is 10.7 J/g higher than that of pure PEG,10%higher than the theoretical *** to the heat storage bridge formed between PEG and RHTC,the thermal conductivity of the composites was up to 0.51 W/mK,which was 99.4%higher than that of ***,the introduction of environmentally friendly and low-cost RHTC gives the composites excellent photothermal conversion capability,and its photothermal conversion energy storage efficiency is as high as 90.1%.These results prove that the prepared composites are promising potential candidates in the field of thermal storage and thermal management systems.

关键词： latent heat storage Carboxylation Renewable resources Photothermal conversion capacity Thermochemistry

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Solar Desalination with latent heat storage Materials and Solar Collector

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Journal of Mechanics Engineering and Automation 2011年第2期1卷 126-134页

作者： Gowtham Mohan Hari Narayanan Soundararajan Department of Mechanical Engineering Thiagarajar College of Engineering Madurai Tamil Nadu 625015 India

Availability of clean water is going to become one of biggest demands of the country. Even though there arc various technologies available for purification of water harnessing solar energy fits the purpose for future problems. Distillation is one of many processes available for water purification, and solar energy is one of several forms of heat energy that can be used to energize this process. In this review a study is made to enhance the productivity of the solar stills by connecting solar still with latent heat storage and solar air heater in series and other factors like improving evaporation rate by maintaining Low depth, more exposure area, heat addition by solar collector and presence of latent heat storage material, which is a paraffin wax as a integral part of still. latent heat storage is one of the most efficient ways of storing thermal energy. Unlike the sensible heat storage method, the latent heat storage method provides much higher storage density, with a smaller temperature difference between storing and releasing heat. Further augmentation of the yield by scraps, pebble, and sand are added.

关键词： Distillation latent heat storage solar still paraffin wax solar collector.

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Abandoned Wind Consumptive Optimal Scheduling Model Considering Load Demand and latent heat storage

Abandoned Wind Consumptive Optimal Scheduling Model Consider...

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第37届中国控制会议

作者： Hongyu Zhang Qingqi Zhao Yanyan Kong Chunsheng Yan Hao Wang Yi Yang Wen Zheng State Grid Liaoning Electric Power Supply Co.LTD Northeastern University Baicheng Power Supply Company Jilin Provincial Power Grid Corp

In the winter heating period,in the northern region,the heating mode of "hot fixed electricity" has limited the capacity of the thermal power unit,resulting in a lot of wind *** order to solve the problem of wind power consumption.,we consider the peak-valley time-of-use tariff strategy,actively guide the adjustment of user side power structure,and the latent heat storage device is arranged at the cogeneration unit to break the traditional model of "hot fixed electricity",or coordinate with the electric heating unit in the power load,the total system coal consumption as the objective function of the minimum,to build a comprehensive scheduling *** particle swarm optimization algorithm is used to solve the problem and compare the operation differences of different heat storage *** results show that the heat storage can not only effectively reduce the system coal consumption,but also increase the level of wind power consumption.

关键词： Peak Valley price latent heat storage Wind power consumption

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Evaluation and Optimization of the Thermal storage Performance of a Triplex-Tube Thermal Energy storage System with V-Shaped Fins

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Journal of Thermal Science 2023年第6期32卷 2048-2064页

作者： YAO Shouguang ZUO Min HUANG Xinyu School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang212100China

Adding fins to a shell-and-tube phase change thermal storage is a simple and effective way to enhance the performance of the phase change heat storage unit,and the proper arrangement of the fins is essential to enhance the performance of the storage *** enhance the performance of the triplex-tube thermal storage unit,a novel V-shaped fin structure is presented in this *** the heat storage performance of the thermal storage system is studied by numerical ***,the performance of the triplex-tube thermal energy storage unit with different arrangements of V-shaped fins is investigated by a two-dimensional model and compared with the use of the traditional rectangular fin structure,and the optimal fin arrangement is *** results show that the V-shaped fins with the optimal arrangement can decrease the time for the PCM melting in the heat storage unit by 31.92%compared to the conventional rectangular *** this basis,the influence of fin angle and thickness on the heat storage unit was ***,a three-dimensional model of the thermal storage unit was *** the effect of the flow parameters(inlet temperature,inlet flow rate)of the heat transfer fluid(HTF)on its performance was discussed in ***,the stored energy analysis of the whole thermal storage unit is carried out.

关键词： triplex-tube thermal energy storage V-shaped fin latent heat storage melting heat transfer enhancement

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Experimental study on the new type of electrical storage heater based on flat micro-heat pipe arrays

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Science China(Technological Sciences) 2018年第2期61卷 219-231页

作者： wang zeyu diao yanhua zhao yaohua liang lin wang tengyue beijing key laboratory of green built environment and efficient technology beijing university of technologyBeijing 100124China beijing advanced innovation center for future internet technology Beijing 100124China

A new type of electrical storage heater that utilizes latent heat storage and flat micro-heat pipe arrays （FMHPAs） was developed. The thermal characteristics of the heater were tested through experimentation. The structure and operating principle of the storage heater were expounded. Three rows of FMHPAs were applied （three rows with five assemblies each） with a mass of 28 kg of phase change material （PCM） in the heat storage tank. Electric power was supplied to the PCM in the range of 0.2-2.04 kW, and air was used as heat transfer fluid, with the volume flow rate ranging from 40-120 m3/h. The inlet temperature was in the range of 15-24~C. The effects of heating power, air volume flow rate, and inlet temperature were investigated. The electrical storage heater exhibited efficiencies of 97% and 87% with 1.98 and 1.30 kW of power during charging and discharging, respectively. Application of the proposed storage heater can transfer electricity from peak periods to off-peak periods, and the excess energy generated by wind farms can be stored as heat and released when needed. Good economic and environmental benefits can be obtained.

关键词： flat micro-heat pipe latent heat storage electrical storage heater peak load shifting wind power utilization

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Microstructure and Thermophysical Properties of Mg-Ga Alloys

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Journal of Wuhan University of Technology(Materials Science) 2021年第4期36卷 490-496页

作者： FAN Xiaoming YE Peiyi ZHAO Tong XU Lianyou CHENG Xiaomin School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

The microstructure and thermal characteristics of Mg-36%Ga,Mg-43%Ga,and Mg-45%Ga(wt%) alloys were *** experimental results show that the microstructure of Mg-36%Ga alloy is mainly composed of primary a-Mg phase and a-Mg+Mg_(5)Ga_(2) eutectic phase,the microstructure of Mg-43%Ga alloy is mainly composed of a-Mg+Mg_(5)Ga_(2) eutectic phase,and the microstructure of Mg-45%Ga alloy is mainly composed of primary Mg_(5)Ga_(2) phase and a-Mg+Mg_(5)Ga_(2) eutectic *** melting enthalpies of Mg-36%Ga,Mg-43%Ga,and Mg-45%Ga are 146.41,171.90,and 113.90 J/g,with the phase change temperature of 422.57,422.70,and 422.90 ℃,***-43%Ga alloy contains the highest melting enthalpy because of the highest content of a-Mg+Mg_(5)Ga_(2) eutectic *** addition,the thermal expansion of the three alloys increases with increasing temperature,while the thermal diffusivity and thermal conductivity decreases with increasing content of Ga.

关键词： Mg-Ga alloy phase change material thermal energy storage latent heat storage

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Experimental Investigation on Prototype latent heat Thermal Battery Charging and Discharging Function Integrated with Solar Collector

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Energy Engineering 2022年第4期119卷 1587-1610页

作者： Farhood Sarrafzadeh Javadi Hendrik Simon Cornelis Metselaar Poo Balan Ganesan Department of Mechanical Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur50603Malaysia Center of Advanced Materials Faculty of EngineeringUniversity of MalayaKuala Lumpur50603Malaysia

This paper reports the performance investigation of a newly developed latent heat Thermal Battery(LHTB)integrated with a solar collector as the main source of *** LHTB is a new solution in the field of thermal storage and developed based on the battery concept in terms of recharge ability,portability and usability as a standalone *** is fabricated based on the thermal battery storage concept and consists of a plate-fin and tube heat exchanger located inside the battery casing and paraffin wax which is used as a latent heat storage *** thermal energy is absorbed by solar collector and transferred to the LHTB using water as heat Transfer Fluid(HTF).Charging experiments have been conducted with a HTF at three different temperatures of 68°C,88°C and 108°C and three different flow rates of 30,60 and 120 l/*** is followed by discharging experiments on fully charged LHTB at three different temperatures of 68°C,88°C and 108°C using HTF at three different flow rates of 30,60 and 120 l/*** is found that both higher HTF inlet temperature and flow rate have a positive impact on stored thermal ***,charging efficiency was decreased by increasing the HTF flow *** highest charging efficiency of 29%was achieved using HTF of 108°C at a flow rate of 30 l/*** of paraffin melted in this case,while part of the paraffin remained solid in other *** the other hand,the results from discharging experiments revealed that both recovered thermal energy and recovery efficiency increased by either increasing the LHTB temperature or HTF flow *** recovered thermal energy of 5,825 KJ at 35%recovery efficiency achieved at LHTB of 108°C using 120 l/h of HTF.

关键词： latent heat thermal battery phase change materials solar thermal latent heat storage thermal battery thermal storage

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