Journal of Thermal Analysis and Calorimetry最新文献_第6页

Maximizing work of finite-potential-reservoir isothermal-chemical-engines with generalized models of bypass-mass-leakage and mass-resistance 利用旁路-质量泄漏和质量阻力的通用模型最大化有限势储层等温-化学发动机的功耗

IF 3 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-10-01 DOI: 10.1007/s10973-024-13603-9

Lingen Chen, Shaojun Xia, Shuangshuang Shi

{"title":"Maximizing work of finite-potential-reservoir isothermal-chemical-engines with generalized models of bypass-mass-leakage and mass-resistance","authors":"Lingen Chen, Shaojun Xia, Shuangshuang Shi","doi":"10.1007/s10973-024-13603-9","DOIUrl":"10.1007/s10973-024-13603-9","url":null,"abstract":"<div><p>Finite-potential-source (FPS) is a feature of isothermal-chemical-engine (ICE) cycle. Model of irreversible FPS iICE with generalized models of bypass-mass-leakage (BML) and mass-resistance is built. Mathematical conditions corresponding to maximum-work-output (MWO) of ICE are deduced using averaged-optimal-control method. Effects of FPS potential capacity characteristic, BML and mass-transfer laws on optimal-cycle-configurations (OCCs) are analyzed. Results obtained include eight special cases, and indicate that: Key component potential-difference between FPS and working-fluid is a constant with MWO objective for endoreversible FPS ICE with linear mass-transfer law (MTL); Ratio of square of difference of concentration of key-component (CKC) between FPS and working-fluid of ICE to CKC in working-fluid is constant with MWO objective for endoreversible FPS ICE with Fick’s diffusive MTL; Optimal CKC relations between FPS and working-fluid with MWO objective for irreversible FPS ICE with BML and mass-resistance are different from those with MWO objective for endoreversible FPS ICE with mass-resistance significantly; Optimal power-second law efficiency relation curves for endoreversible FPS and infinite-potential-source ICEs with mass-resistance are parabolic-type ones, while those for irreversible FPS and infinite-potential-source ICEs with BML and mass-resistance are loop-shaped ones.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"149 21","pages":"11817 - 11825"},"PeriodicalIF":3.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative study on the effect of surface-modified nanoparticles on PCM for solar energy applications 表面改性纳米粒子对太阳能应用中的 PCM 的影响比较研究

IF 3 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-09-30 DOI: 10.1007/s10973-024-13627-1

Nergiz Ulker, Hüsamettin Bulut, Gokhan Demircan

{"title":"Comparative study on the effect of surface-modified nanoparticles on PCM for solar energy applications","authors":"Nergiz Ulker, Hüsamettin Bulut, Gokhan Demircan","doi":"10.1007/s10973-024-13627-1","DOIUrl":"10.1007/s10973-024-13627-1","url":null,"abstract":"<div><p>This study focuses on the critical role of paraffin, an important phase change material (PCM) known for its high thermal capacity, for thermal energy storage in solar energy applications with respect to experimental thermodynamics. Nanoparticles and surfactants were used for enhancing the properties of PCMs. An experimental setup was established, and the effect of oleic acid (OA) as a surfactant on PCM was thoroughly examined. The effect of metallic oxide-based nanoparticles (Al<sub>2</sub>O<sub>3</sub>, MgO, SiO<sub>2</sub>, ZnO, Fe<sub>2</sub>O<sub>3</sub> and Cu<sub>2</sub>O) on the thermal properties of paraffin was experimentally investigated. The mass fraction was kept constant at 2.5% to explore the best nano-enhanced phase change material (NePCM). The effect of the homogeneous distribution was also studied in detail. SEM analysis showed that OA improved the homogeneity of the NePCM. The Cu<sub>2</sub>O-doped sample had the best thermal conductivity value in samples with and without OA, improving by 66% and 58%, respectively. The charging and discharging times of all NePCM decreased when compared to pure paraffin. The highest latent heat capacity was detected in ZnO-doped sample. The findings indicate that NePCM with OA outperforms NePCM without OA in terms of thermal performance, showcasing its potential for enhancing energy efficiency in solar energy applications.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"149 21","pages":"12053 - 12070"},"PeriodicalIF":3.0,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterizing mesoporosity in MOFs: a thermoporometry approach 表征 MOFs 中的介孔隙度：一种热压测量法

IF 3 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-09-30 DOI: 10.1007/s10973-024-13667-7

Gabriela Zelenková, Tomáš Zelenka, Miroslav Almáši

引用次数: 0

Infrared thermography in children: identifying key facial temperature distribution patterns 儿童红外热成像：识别关键的面部温度分布模式

IF 3 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-09-28 DOI: 10.1007/s10973-024-13652-0

Amanda Freitas Valentim, Andréa Rodrigues Motta, Júlia Ana Soares Silva, Yasmim Carvalho Telson, Patrícia Vieira Salles, Renata Maria Moreira Moraes Furlan, Matheus Pereira Porto, Ana Cristina Côrtes Gama

{"title":"Infrared thermography in children: identifying key facial temperature distribution patterns","authors":"Amanda Freitas Valentim, Andréa Rodrigues Motta, Júlia Ana Soares Silva, Yasmim Carvalho Telson, Patrícia Vieira Salles, Renata Maria Moreira Moraes Furlan, Matheus Pereira Porto, Ana Cristina Côrtes Gama","doi":"10.1007/s10973-024-13652-0","DOIUrl":"10.1007/s10973-024-13652-0","url":null,"abstract":"<div><p>Infrared thermography is a versatile non-invasive examination method. Only a few studies used it on children´s face. To describe facial temperature spatial distribution in nasal-breathing children, compare temperature between sexes, and verify whether thermoanatomic points described for adults are easily viewed in children, and to assess the reliability of marking those points. Cross-sectional observational study of 30 nasal-breathing children of both sexes aged 4 to 11 years. Three thermograms of each participant were recorded. The mean temperatures of 14 thermoanatomic points were assessed in the front view thermogram, as well as 12 such points (six on each side) in the side view thermograms. Descriptive analysis, comparison between the sexes, and intra- and interrater agreement analyses of point assessment were made. In the front view thermogram, the highest temperature was in the Medial Palpebral Commissure (right: 34.83 °C and left: 34.93 °C), while in the side view, it was in the Temporal (34.78 °C and 34.77 °C). The Supratrochlear point did not stand out on the children’s faces. The forehead, eyes, and perioral regions were the warmest ones, while the nose, cheeks, and chin were the coolest ones. No differences were found between the sexes (<i>p</i> > 0.05). Intra- and interrater agreement analyses of point assessment ranged from good to excellent. Children exhibited thermal asymmetry. Their warmest regions were the forehead, eyes, and perioral region. There was no difference between sexes and the thermoanatomic points found in children were similar to those in adults, except for Supratrochlear, which is not nitid. Intra and interrater agreement was good or excellent for most points.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"149 22","pages":"12747 - 12755"},"PeriodicalIF":3.0,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

General thermodynamic law: volume effect on thermal properties and phase transition 一般热力学定律：体积对热特性和相变的影响

IF 3 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-09-28 DOI: 10.1007/s10973-024-13563-0

M. B. Tang, X. C. Liu, X. H. Pan

{"title":"General thermodynamic law: volume effect on thermal properties and phase transition","authors":"M. B. Tang, X. C. Liu, X. H. Pan","doi":"10.1007/s10973-024-13563-0","DOIUrl":"10.1007/s10973-024-13563-0","url":null,"abstract":"<div><p>Recent studies show that there is a universal thermodynamic behavior in crystalline solids: the heat capacity is dependent on both of the temperature and thermal expansion (or volume). In glasses (or disordered materials), the heat capacity jump at glass transition is a typical feature, and is an important unsolved problem in solid state physics. There is not a quantitative interpretation for the volume effect on the heat capacity jump at glass transition at present. In this paper, we study the volume effect on the thermal behaviors in the typical Pd-based glass-forming alloy, and give an accurate interpretation between the change of the volume and the temperature dependent thermal properties. The crystalline and its disordered materials have same model parameters and same volume effect. Phase transition can be classified only by the corresponding relation between the volume and temperature. And the glass transition, a volume-induced thermal behavior, is a special phase transition between the classical first order and second order phase transitions. The thermal properties in materials with different states are well explained by the unified heat capacity model when the volume effect is considered, which shows that there a general thermodynamic rule in materials.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"149 22","pages":"13045 - 13051"},"PeriodicalIF":3.0,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facile synthesis of 3D flower-like nickel phyllosilicate on graphite phase carbon nitride: a strategy for reducing fire hazard of epoxy resin 在石墨相氮化碳上轻松合成三维花状硅酸镍：降低环氧树脂火灾危险的一种策略

IF 3 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-09-25 DOI: 10.1007/s10973-024-13547-0

Zongquan Zhao, Shibin Nie, Hong Zhang, Jinian Yang, Dongyue Zhao, Shuo Wu

{"title":"Facile synthesis of 3D flower-like nickel phyllosilicate on graphite phase carbon nitride: a strategy for reducing fire hazard of epoxy resin","authors":"Zongquan Zhao, Shibin Nie, Hong Zhang, Jinian Yang, Dongyue Zhao, Shuo Wu","doi":"10.1007/s10973-024-13547-0","DOIUrl":"10.1007/s10973-024-13547-0","url":null,"abstract":"<div><p>The design of epoxy resin (EP) with high flame retardancy, smoke suppression, and rapid curing capability has attracted significant attention in industrial applications. To reduce the fire hazard and enhance the processability of EP-based materials, a novel hybrid (g-C<sub>3</sub>N<sub>4</sub>@NiPS) was synthesized by in-situ growth of flower-like nickel phyllosilicate on the surface of graphite phase carbon nitride. The effects of g-C<sub>3</sub>N<sub>4</sub>@NiPS on the thermal stability and combustion properties of EP composites were investigated. The results showed that 5 mass% g-C<sub>3</sub>N<sub>4</sub>@NiPS delayed the early-stage decomposition and increased the residual char of the EP composite from 11.3 to 20.8 mass%. The addition of 5 mass% g-C<sub>3</sub>N<sub>4</sub>@NiPS reduced the peak heat release rate and peak smoke production rate of the EP composite by 34.5% and 41.9%, respectively. Specifically, the maximum release rates of CO and CO<sub>2</sub> decreased by 49.2% and 32.3%, respectively, greatly reducing the fire hazard. The residual char of EP/g-C<sub>3</sub>N<sub>4</sub>@NiPS exhibited a high degree of graphitization and displayed an excellent barrier effect, reducing the supply of fuel and the release of toxic fumes during EP combustion. Additionally, the presence of g-C<sub>3</sub>N<sub>4</sub>@NiPS showed a beneficial impact on expediting the cure response. This study provides a feasible strategy for the wide application of EP.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"149 22","pages":"12719 - 12735"},"PeriodicalIF":3.0,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Thermal analysis of cold saving system via numerical modeling incorporating nanomaterial 通过结合纳米材料的数值建模对蓄冷系统进行热分析

IF 3 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-09-25 DOI: 10.1007/s10973-024-13499-5

Yahya Ali Rothan

引用次数: 0

Thermo-economic analysis of a hybrid atmospheric water generator (AWG): a case study in Mashhad, Iran 混合式大气水发电机（AWG）的热经济分析：伊朗马什哈德的案例研究

IF 3 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-09-24 DOI: 10.1007/s10973-024-13450-8

Mohsen Kazemi, Reza Barati, Ali Kianifar

{"title":"Thermo-economic analysis of a hybrid atmospheric water generator (AWG): a case study in Mashhad, Iran","authors":"Mohsen Kazemi, Reza Barati, Ali Kianifar","doi":"10.1007/s10973-024-13450-8","DOIUrl":"10.1007/s10973-024-13450-8","url":null,"abstract":"<div><p>In arid and semi-arid regions with low relative humidity, it is difficult to obtain drinking water from the air humidity. The water supply in Mashhad faces many challenges. The water production from atmospheric humidity is one method of supplying water in Mashhad. The aim of this study was to investigate a small-scale hybrid atmospheric water generator (AWG) that utilizes a desiccant wheel to adsorb and desorb air humidity. The proposed AWG was mathematically modeled in order to determine its efficiency and performance. A complete energy, exergy, and economic (3E) analyses were conducted on the proposed system. In order to validate the mathematical model, a numerical simulation was performed using the ANSYS 2022R1 software. The water generation rate, energy consumption, specific energy consumption, and energy-exergy efficiency of the proposed system were presented in months. According to the results, the WGR is highest in July at 156 L day<sup>−1</sup> and lowest in December at 23 L day<sup>−1</sup>. Additionally, July and December had the highest and lowest SECs during the year, with 1.5 kWh L<sup>−1</sup> and 10 kWh L<sup>−1</sup>, respectively. Additionally, July and December recorded the highest and lowest energy and exergy efficiencies, respectively, with 22.1%, 1.25% and 4.8%, 0.14%.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"149 21","pages":"11841 - 11860"},"PeriodicalIF":3.0,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A simplified LMTD approach to assess the effectiveness of a chevron-type plate heat exchanger 评估雪佛龙型板式热交换器有效性的简化 LMTD 方法

IF 3 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-09-24 DOI: 10.1007/s10973-024-13573-y

Atul Bhattad, Vinay Atgur, B. Nageswara Rao, N. R. Banapurmath, G. Manavendra, Ashok M. Sajjan, Irfan Anjum Badruddin, Vijay Tambrallimath, Sarfaraz Kamangar, Mohamed Hussien

{"title":"A simplified LMTD approach to assess the effectiveness of a chevron-type plate heat exchanger","authors":"Atul Bhattad, Vinay Atgur, B. Nageswara Rao, N. R. Banapurmath, G. Manavendra, Ashok M. Sajjan, Irfan Anjum Badruddin, Vijay Tambrallimath, Sarfaraz Kamangar, Mohamed Hussien","doi":"10.1007/s10973-024-13573-y","DOIUrl":"10.1007/s10973-024-13573-y","url":null,"abstract":"<div><p>Designing heat exchangers (HEXs) for a wide range of applications, involves a complex interplay of factors like cost, maintenance, material selection, pressure drop, fluid flow configuration, and heat transfer. Due to this complexity, empirical relationships are used performance evaluation, focusing on heat transfer rate (<i>q</i>), overall heat transfer coefficient <span>(left( U right))</span>, and effectiveness <span>(left( varepsilon right))</span>. Testing is crucial to measure the outlet temperatures for specific inlet conditions and fluid flow characteristics. This paper introduces a simple and reliable iterative procedure for estimating cold (<span>(T_{text{co}})</span>) and hot (<span>(T_{text{ho}})</span>) fluid outlet temperatures in a Chevron plate heat exchanger (CPHE). This procedure relies on two basic equations of heat transfer rate (<i>q</i>), and logarithmic mean temperature difference (LMTD),<span>(Delta T_{text{lm}})</span>, incorporating specified inlet parameters. The proposed approach was validated by comparing its predictions to measured data. The method is general and adaptable to other HEX types. by properly defining the temperature differences in the LMTD and evaluating the HEX performance using relevant empirical relationships for the output responses with estimates of <span>(T_{text{co}})</span> and <span>(T_{text{ho}})</span> to the inlet parameters. The estimated and measured cold fluid outlet temperature (<span>(T_{text{co}})</span>) exhibited a relative error of 1.8 to 2.6%. Similarly, the hot fluid outlet temperature (<span>(T_{text{ho}})</span>) showed a relative error of 2.4 to 3.5%. This work provides valuable insights for designers, enabling them to assess HEX performance before conducting costly and time-consuming testing.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"149 21","pages":"12205 - 12217"},"PeriodicalIF":3.0,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on three-dimensional natural convection heat transfer in a house with two heating surfaces 带有两个加热面的房屋中的三维自然对流传热研究

IF 3 3区工程技术

Journal of Thermal Analysis and Calorimetry Pub Date : 2024-09-24 DOI: 10.1007/s10973-024-13521-w

Han-Taw Chen, Soft-Heart Wang, Saman Rashidi, Wei-Mon Yan

{"title":"Study on three-dimensional natural convection heat transfer in a house with two heating surfaces","authors":"Han-Taw Chen, Soft-Heart Wang, Saman Rashidi, Wei-Mon Yan","doi":"10.1007/s10973-024-13521-w","DOIUrl":"10.1007/s10973-024-13521-w","url":null,"abstract":"<div><p>In order to explore the heat transfer properties of natural convection in the cavity, this article uses the three-dimensional CFD inverse method and the temperature measurement points based on the experimental results. In addition, different flow modes and mesh divisions are used. For the applicability of different turbulence models, the least squares method is then used to calculate Q value of the heat source in the cavity and compare that with the experimental measurement results and consistent with the overall trend. Finally, the temperature distribution diagram and velocity streamline diagram of the simulation results are provided to visualize the flow field and analyze its heat transfer characteristics. The results show that the flow pattern and the number of grid points have a great influence on the results. In terms of experiments, with the change of the cavity size and the influence of the opening, the air flow will be different. To achieve the effect of enhancing natural convection, due to the inflow of a large amount of cold air, although the overall temperature of the cavity is greatly reduced, the upper cold wall is surrounded by cold air, which reduces the heat transfer coefficient. In order to verify the reliability and usability of the results of the inverse algorithm in this article, the obtained results of heat transfer coefficient and heat dissipation are compared with previous results or empirical formulas in other related literature. When the height drops from h = 0.1 m to h = 0.05 m, the average increase in heat transfer coefficient is 2.79%; while for the height drops from h = 0.05 m to h = 0.02 m, the average increase in heat transfer coefficient is 74.8%. When side fin length is reduced form W<sub>2</sub> = 0.1 m to W<sub>2</sub> = 0.08 m, the average increase in heat transfer coefficient is 14.33%; when side fin length is reduced form W<sub>2</sub> = 0.08 m to W<sub>2</sub> = 0.06 m, the average increase in heat transfer coefficient is 41.28%.</p></div>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":"149 22","pages":"13175 - 13197"},"PeriodicalIF":3.0,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0