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Journal articles on the topic 'Lumped-heat-capacity method'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Sun, Zehui, Guoli Li, Zhe Qian, Weifei Li, and Jian Jing. "Lumped-Capacity Method for Easy Estimation of Interfacial Heat Transfer Coefficients in Die Casting." International Journal of Materials, Mechanics and Manufacturing 8, no. 3 (2020): 104–8. http://dx.doi.org/10.18178/ijmmm.2020.8.3.492.

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2

Nikolai, Kobasko. "STUDY OF DIFFERENCES BETWEEN REAL AND EFFECTIVE HEAT TRANSFER COEFFICIENTS TO PROVIDE CORRECT DATA ON TEMPERATURE FIELD CALCULATIONS AND COMPUTER SIMULATIONS DURING HARDENING OF STEEL." EUREKA: Physics and Engineering, no. 3 (May 31, 2018): 42–51. https://doi.org/10.21303/2461-4262.2018.00646.

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The paper analyses contemporary methods and probes for testing liquid media used as a quenchant in heat treating industry. It is shown that lumped-heat-capacity method, often used for testing liquid media, produces big errors during transient nucleate boiling processes due to incorrect calculation condition  caused by use effective heat transfer coefficient (HTC). The effective heat transfer coefficients (HTCs), utilized for this purpose, are almost seven times less as compared with real HTCs that results in incorrect calculation the value of Bi. Instead of lumped-heat -capacity method, a

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3

Seregina, E. V., and М. А. Stepovich. "On the projection method for solving the heat equation with lumped heat capacity." Izvestiya of Saratov University. Mathematics. Mechanics. Informatics 25, no. 2 (2025): 173–83. https://doi.org/10.18500/1816-9791-2025-25-2-173-183.

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4

Kobasko, Nikolai. "STUDY OF DIFFERENCES BETWEEN REAL AND EFFECTIVE HEAT TRANSFER COEFFICIENTS TO PROVIDE CORRECT DATA ON TEMPERATURE FIELD CALCULATIONS AND COMPUTER SIMULATIONS DURING HARDENING OF STEEL." EUREKA: Physics and Engineering 3 (May 31, 2018): 42–51. http://dx.doi.org/10.21303/2461-4262.2018.00646.

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The paper analyses contemporary methods and probes for testing liquid media used as a quenchant in heat treating industry. It is shown that lumped-heat-capacity method, often used for testing liquid media, produces big errors during transient nucleate boiling processes due to incorrect calculation condition caused by use effective heat transfer coefficient (HTC). The effective heat transfer coefficients (HTCs), utilized for this purpose, are almost seven times less as compared with real HTCs that results in incorrect calculation the value of Bi. Instead of lumped-heat -capacity method, a gener

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5

Zhao, Li Bin, Yuan Wei Li, and Feng Rui Liu. "Taylor Series Numerical Method in Transient Heat Conduction Analysis." Applied Mechanics and Materials 275-277 (January 2013): 677–80. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.677.

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Taylor series numerical method (TSNM) is extended to the field of transient heat conduction. Theoretical description of TSNM for transient heat conduction problems is presented. Furthermore, the algorithm is realized and embedded in commercial software ANSYS®. If a lumped mass heat capacity matrix provided, the governing equation of transient heat conduction problems, which is a differential equation, will be solved by a series of recursion calculation of Taylor expanding coefficients. A typical transient heat conduction problem with analytical solution was discussed to verify the TSNM. At las

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6

Lin, Xiyue, Xianjun Li, Wenliang Zhang, et al. "A review of methods for calculating of the interfacial heat transfer coefficient." Journal of Physics: Conference Series 2403, no. 1 (2022): 012036. http://dx.doi.org/10.1088/1742-6596/2403/1/012036.

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Abstract As an important parameter for quenching and simulation, the interfacial heat transfer coefficient (IHTC) is hard to be directly measured through experiments. Researchers have come up with different methods to solve the problem. Currently, the numerical method, the heat balance method (HBM), the Beck’s non-linear estimation method (BEM), and the lumped heat capacity method (LCM) are the main methods of calculating the IHTC. In this paper, the direct heat conduction problem and the solution are firstly analysed, then the solutions and applications of different methods for calculating IH

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7

Sugianto, A., Michiharu Narazaki, and M. Kogawara. "Iterative Modification of Lumped Heat Capacity Method on Predicting Residual Stress and Distortion of Still-Quenched S45C Steel Cylinder." Materials Science Forum 561-565 (October 2007): 1857–60. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.1857.

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Computer simulation can be utilized to predict the property and quality of heat-treated products. The prediction accuracy depends upon the thermal boundary condition and the thermal history from which surface heat transfer coefficient (HTC) is derived. Variables studied are thermal boundary and the surface HTC. Zone-based thermal boundary is set with and without edge effect. Lumped heat capacity method is used to predict HTC of silver probe (1st step), then iterative modification method is applied to the prediction of HTC of SUS304 cylinder (2nd step) and S45C cylinder itself (3rd step). Using

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8

Chen, Chu, Zhi Guo Lu, and Jian Ping Lin. "Temperature Variation History Prediction of Fully-Closed Adhesive Joint in Curing Process." Applied Mechanics and Materials 44-47 (December 2010): 394–99. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.394.

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To describe the heat transfer of fully-closed adhesive joint in curing process, adhesive joint, enclosure for closing joints and its inner air are simplified as a multi-lumped-heat-capacity system neglecting the heat from adhesive chemical reaction. Based on heat transfer theory, a temperature prediction model of fully-closed joint was proposed. Combining experimental temperature history of the joint with finite difference method, the combined heat transfer coefficients of adhesive under different curing temperatures were obtained according to Newton's heat transfer formula. And the model was

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9

Campo, Antonio, and Graham Spencer. "A Simple Experimental Procedure for the Approximate Determination of the Heat Capacity of Metals in a Natural Convection Environment under the Premises of a Lumped Model." International Journal of Mechanical Engineering Education 35, no. 4 (2007): 316–23. http://dx.doi.org/10.7227/ijmee.35.4.6.

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A method is presented of measuring the specific heat capacity, Cp, of pure metals and alloys in an undergraduate thermofluids laboratory using simple concepts of unsteady heat conduction in solids and natural convection in fluids taken from textbooks on heat transfer. A simple experiment was developed in which a small-diameter metallic sphere at ambient temperature (∼20° C) is suddenly immersed in a tank containing quiescent ice water at 0° C. The metallic sphere was suspended by the lead wire of a thermocouple and the temperature-time evolution was recorded. A first-order differential equatio

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10

Zhang, Xiaoxuan, Reinhardt Klein, Anantharaman Subbaraman, et al. "Evaluation of convective heat transfer coefficient and specific heat capacity of a lithium-ion battery using infrared camera and lumped capacitance method." Journal of Power Sources 412 (February 2019): 552–58. http://dx.doi.org/10.1016/j.jpowsour.2018.11.064.

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11

Koštial, Pavel, Ivo Špička, Zora Jančikova, Jan Valiček, Marta Harničarova, and Josef Hlinka. "On Experimental Thermal Analysis of Solid Materials." Measurement Science Review 14, no. 6 (2014): 317–22. http://dx.doi.org/10.2478/msr-2014-0043.

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Abstract The paper is devoted to the presentation of a method for measurement of thermal conductivity k, specific heat capacity cp, and thermal diffusivity applying the lumped capacitance model (LCM) as a special case of Newton’s model of cooling. At the specific experimental conditions resulting from the theoretical analysis of the used model, we present a method for experimental determination of all three above mentioned thermal parameters for materials with different thermal transport properties. The input experimental data provide a cooling curve of the tested material. The evaluation of e

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12

D’Alessandro, Giampaolo, Filippo de Monte, and Donald E. Amos. "Effect of Heat Source and Imperfect Contact on Simultaneous Estimation of Thermal Properties of High-Conductivity Materials." Mathematical Problems in Engineering 2019 (June 23, 2019): 1–15. http://dx.doi.org/10.1155/2019/5945413.

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In the current paper a novel methodology accounting for both the heater heat capacity and the imperfect thermal contact between a thin heater and a specimen is proposed. In particular, the volumetric heat capacity of the heater is considered by modelling it as a lumped capacitance body, while the imperfect thermal contact is considered by means of a contact resistance. Thus, the experimental apparatus consisting of three layers (specimen-heater-specimen) is reduced to a single finite layer (sample) subject to a “nonclassical” boundary condition at the heated surface, known as sixth kind. Once

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13

Luo, Chuan, Han Wang, Dacheng Zhang, et al. "Analytical Evaluation and Experiment of the Dynamic Characteristics of Double-Thimble-Type Fiber Bragg Grating Temperature Sensors." Micromachines 12, no. 1 (2020): 16. http://dx.doi.org/10.3390/mi12010016.

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A double-thimble-type fiber Bragg grating (FBG) temperature sensor that isolates the stress strain is developed, and the three materials of air, grease, and copper thimble are employed for encapsulating. To investigate the effect of different encapsulation materials on the time constant of the sensors under dynamic conditions, the transient heat conduction mathematical model is built according to the lumped heat capacity (LHC) system and thermal equilibrium theory, and the time constant is solved by an analytical solution. Then, a proportional three-dimensional sensor simulation model is estab

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14

Sugianto, A., Michiharu Narazaki, M. Kogawara, S. Y. Kim, and S. Kubota. "The Effect of Transformation Plasticity on Prediction of Tooth Distortion of Heat-Treated Helical Gear." Materials Science Forum 561-565 (October 2007): 1853–56. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.1853.

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The displacement profile in a shank and dedendum-addendum circle of helical gear made of through-hardened S45C carbon steel and carburized-hardened SCr420H low alloy steel by gas carburizing was measured and predicted using a finite element method of DEFORM-HT. Both gears were quenched into same oil quenchant. Heat Transfer Coefficient (HTC) was taken by measuring thermal history inside of firstly silver probe and secondly stainless steel SUS304 gear blank. Uniform HTC of silver probe was calculated by lumped heat capacity method, whereas zone-based HTC of SUS304 gear blank was calculated by i

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15

Xiao, Yihua, and Hecheng Wu. "An Explicit Coupled Method of FEM and Meshless Particle Method for Simulating Transient Heat Transfer Process of Friction Stir Welding." Mathematical Problems in Engineering 2020 (May 20, 2020): 1–16. http://dx.doi.org/10.1155/2020/2574127.

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Friction stir welding (FSW) is a favorable welding technology for aluminum alloys. The FSW process involves complex heat and mass transfer. Explicit meshless particle methods are currently popular methods for simulating the process, but they require expensive computational cost. Coupling explicit finite element method (FEM) and meshless particle methods can ease the problem by making use of high efficiency of FEM and advantages of meshless particle methods. Though many efforts have been made to couple FEM and meshless particle methods for transient dynamics problems, coupling them for transien

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16

Tajik Jamalabad, Milad, Cristobal Cortes, Javier Pallarés, Antonia Gil, and Inmaculada Arauzo. "Comparison of Different Numerical Models for Solidification of Paraffin-Based PCMs and Evaluation of the Effect of Variable Mushy Zone Constant." Energies 17, no. 23 (2024): 5982. http://dx.doi.org/10.3390/en17235982.

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The impact of the mushy zone parameter (Amushy) and the chosen numerical model during the solidification of a commercial paraffin-type phase change material (PCM) in a vertical cylinder under T-history conditions was examined through numerical simulations. The cooling process was modeled using three methods implemented in the CFD software ANSYS Fluent 2020 R2: the enthalpy–porosity method, the apparent heat capacity (AHC) method, and a new model proposed by the authors which incorporates heat capacity directly into ANSYS Fluent. To accurately define the boundary conditions, radiative heat tran

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17

Mullisen, R. S. "Thermal Engineering Design Project: Disk Brake Cooling Simulation." International Journal of Mechanical Engineering Education 25, no. 4 (1997): 299–305. http://dx.doi.org/10.1177/030641909702500406.

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A thermal engineering design project involving simulated cooling of vented and nonvented disk brakes is described. A heated copper tube was rotated in a manner that replicated the motion of a single vented passageway inside a disk brake rotor. The class assignment required design and construction of equipment, and data reduction using the lumped heat capacity method to obtain heat transfer correlations. The seven student groups plus the author produced 238 data points which were collectively correlated into two Nusselt number curves. The curve for the nonvented brakes simulation was benchmarke

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18

Wang, Guiqiang, Xiaohang Cheng, Zhiqiangè Kang, and Guohui Feng. "Influence of Airflow Field on Food Freezing and Energy Consumption in Cold Storage." E3S Web of Conferences 53 (2018): 01038. http://dx.doi.org/10.1051/e3sconf/20185301038.

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Currently most food products are cooled and frozen in air-blast cold storage to prolong storage time. The airflow field distribution in storage has a great impact on the process of food freezing and energy cost by that. In this paper, a transient model of food freezing considering airflow field was developed to simulation the temperature profile of air and food products during freezing process. A lumped parameter model was used to predict the temperature and moisture profile of air, which connected all other components together, such as air coolers, food products, envelop enclosure and refrige

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19

Duda, Piotr. "Heat Transfer Coefficient Distribution—A Review of Calculation Methods." Energies 16, no. 9 (2023): 3683. http://dx.doi.org/10.3390/en16093683.

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Determination of the heat transfer coefficient (HTC) distribution is important during the design and operation of many devices in microelectronics, construction, the car industry, drilling, the power industry and research on nuclear fusion. The first part of the manuscript shows works describing how a change in the coefficient affects the operation of devices. Next, various methods of determining the coefficient are presented. The most common method to determine the HTC is the use of Newton’s law of cooling. If this method cannot be applied directly, there are other methods that can be found i

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20

D’Alessandro, Giampaolo, and Filippo de Monte. "Multi-Layer Transient Heat Conduction Involving Perfectly-Conducting Solids." Energies 13, no. 24 (2020): 6484. http://dx.doi.org/10.3390/en13246484.

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Boundary conditions of high kinds (fourth and sixth kind) as defined by Carslaw and Jaeger are used in this work to model the thermal behavior of perfect conductors when involved in multi-layer transient heat conduction problems. In detail, two- and three-layer configurations are analyzed. In the former, a thin layer modeled as a lumped body is subject to a surface heat flux on the front side while it is in perfect (fourth kind) or in imperfect (sixth kind) thermal contact with a semi-infinite or finite body on the back side. When dealing with a semi-infinite body in imperfect contact, the tem

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21

Wardach-Świȩcicka, Izabela, Sylwia Polesek-Karczewska, and Adam Da̧browski. "Predicting the Performance of a Helically Coiled Heat Exchanger for Heat Recovery from a Waste Biomass Incineration System." Sustainability 17, no. 2 (2025): 759. https://doi.org/10.3390/su17020759.

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Nowadays, with increasing concerns about the environment and energy security, efforts have intensified to develop effective energy generation technologies based on renewable sources that align with the principles of sustainable growth. In response to these demands, biomass-fueled furnaces have become essential components of modern combined heat and power generation systems. This work aims to predict the thermal performance of a helically coiled multi-tube heat exchanger designed to recover heat from waste biomass incineration flue gases. The working fluid used is thermal oil. The work focuses

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22

Li, Dong, Sujun Dong, Jun Wang, and Yunhua Li. "Temperature Dynamic Characteristics Analysis and Thermal Load Dissipation Assessment for Airliner Hydraulic System in a Full Flight Mission Profile." Machines 10, no. 4 (2022): 258. http://dx.doi.org/10.3390/machines10040258.

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This paper deals with the modeling of the thermal load and the simulation of thermal dynamic characteristics for the hydraulic system of a large airliner in a full mission profile. Firstly, the formation mechanism of the thermal load in the hydraulic system is analyzed, and thermal dynamic modeling is conducted of the hydraulic components of an hydraulic system with an immersed heat exchanger employing the lumped parameter thermal node method and oil temperature and power loss of each key node within the hydraulic system within a full mission profile. Then, a thermal dynamic simulation model b

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23

Mei, Rui Bin, Ban Cai, Chang Sheng Li, and Xiang Hua Liu. "Fast Prediction of Temperature by FEM in Hot Strip Rolling." Advanced Materials Research 482-484 (February 2012): 616–20. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.616.

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Finite element method (FEM) has been one of the most important numerical simulation tools with the development of computer technology. However, it is only used to simulate and analyze different process offline in many fields because of the longer computational time. The influencing factors of prediction of temperature in the strip rolling by FEM including equations, mesh and storage of matrix was investigated in the paper. The lumped heat capacity matrix was introduced to resolve the oscillation problem and improve precision. Furthermore, the refined elements layer upon layer was discussed to

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24

Tang, Yongming, Shouguang Sun, Wenfei Yu, and Wei Hua. "Thermal Analysis of Water-Cooling Permanent Magnet Synchronous Machine for Port Traction Electric Vehicle." Electronics 12, no. 3 (2023): 734. http://dx.doi.org/10.3390/electronics12030734.

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To further increase the torque/power density of a permanent magnet synchronous machine (PMSM) employed for a port traction electric vehicle, improving the thermal dissipation capacity of the cooling system used in the PMSM has become more and more important. This paper focuses on the thermal analysis of a water-cooling 200 kW PMSM for a port traction electric vehicle. First, the size parameters of the machine and the thermal property parameters of the materials used for each component are given. Based on the heat transfer theory, a fast evaluation method for a transient temperature rise in the

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25

Zhang, Zhongkai, Bian Tian, Gong Cheng, et al. "Influences of RF Magnetron Sputtering Power and Gas Flow Rate on a High Conductivity and Low Drift Rate of Tungsten-Rhenium Thin-Film Thermocouples." Nanomaterials 12, no. 7 (2022): 1120. http://dx.doi.org/10.3390/nano12071120.

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Thin-Film Thermocouples (TFTCs) are characterized by their high spatial resolutions, low cost, high efficiency and low interference on the air flow. However, the thermal stability of TFTCs should be further improved for application since their accuracy is influenced by joule heat and temperature time drift. In this paper, 3D molecular dynamics and finite element analysis are used for structural design. The effects of RF magnetron sputtering power and gas flow rate on conductivity and temperature time drift rate (DT) of high thermal stability tungsten–rhenium (95% W/5% Re vs. 74% W/26% Re) TFTC

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26

Montani, Marco, Ali Gökhan Demir, Ehsan Mostaed, Maurizio Vedani, and Barbara Previtali. "Processability of pure Zn and pure Fe by SLM for biodegradable metallic implant manufacturing." Rapid Prototyping Journal 23, no. 3 (2017): 514–23. http://dx.doi.org/10.1108/rpj-08-2015-0100.

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Purpose This paper aims to investigate the processability by selective laser melting (SLM) of materials of potential interest for innovative biodegradable implants, pure Fe and pure Zn. The processability of these materials is evaluated with a more established counterpart in permanent implants, stainless steel. In particular, the processing conditions were studied to reduce porosity due to incomplete fusion of the powder. Design/methodology/approach In the first phase of the experiments, SLM of AISI 316L was studied through design of experiments method. The study was used to identify the signi

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27

Ajbar, Abdelhamid, Bilal Lamrani, and Emad Ali. "Dynamic Investigation of a Coupled Parabolic Trough Collector–Phase Change Material Tank for Solar Cooling Process in Arid Climates." Energies 16, no. 10 (2023): 4235. http://dx.doi.org/10.3390/en16104235.

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The use of solar energy for cooling processes is advantageous for reducing the energy consumption of conventional air-conditioning systems and protecting the environment. In the present work, a solar-powered cooling system with parabolic trough collectors (PTC) and a phase change material (PCM) tank is numerically investigated in the arid climates of Saudi Arabia. The system contains a 160-kW double-effect absorption chiller powered by solar-heated pressurized water as a heat transfer fluid (HTF) and a shell and tube PCM as a thermal battery. The novelty of this paper is to investigate the fea

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28

Wang, Huixiang, Dianzuo Wang, Baidan Li, and Shuiyu Sun. "Improved methods to determine the electrochemical Peltier heat using a thermistor I: Improved heat-sensor electrodes and lumped-heat-capacity analysis." Journal of Electroanalytical Chemistry 392, no. 1-2 (1995): 13–19. http://dx.doi.org/10.1016/0022-0728(95)04024-i.

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29

Karwacki, Jarosław. "Cooling System with PCM Storage for an Office Building: Experimental Investigation Aided by a Model of the Office Thermal Dynamics." Materials 14, no. 6 (2021): 1356. http://dx.doi.org/10.3390/ma14061356.

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The application of energy storage filled with phase-change material (PCM) is recently increasingly considered in active cooling systems. Such a design offers a higher density of thermal energy accumulation when compared with water storage. However, the optimum use of PCM storage is possible when its dynamic characteristics during the loading and unloading process are well recognized. Due to the complexity of the interaction between all elements of the heating/cooling system, a theoretical estimation of the profits is hard to perform in a reliable way. This is a significant problem at the desig

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30

Zhang, Han, Taylor R. Garrick, Christine Labaza, et al. "Predicting the Heat Generation Rate in Large Format Pouch-Type Lithium-Ion Battery Cells for Automotive Applications." ECS Meeting Abstracts MA2023-01, no. 25 (2023): 1667. http://dx.doi.org/10.1149/ma2023-01251667mtgabs.

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Accurate prediction of the heat generation rate of lithium ion batteries is critical for driving towards a cost effective and efficient design of a thermal management system for various applications.[1, 2] because of the increase in battery cell dimensions associated with an increase in battery cell capacity to drive towards a reduction in range anxiety for automotive applications, as well as more aggressive operating conditions that are typically seen in the automotive industry, such as direct current fast charge and sustained driving under load, heat generation at the cell level must be cons

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31

Zhang, Han, Taylor R. Garrick, Christine Labaza, et al. "Predicting the Heat Generation Rate in Large Format Pouch-Type Lithium-Ion Battery Cells for Automotive Applications." ECS Meeting Abstracts MA2023-02, no. 7 (2023): 971. http://dx.doi.org/10.1149/ma2023-027971mtgabs.

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Accurate prediction of the heat generation rate of lithium ion batteries is critical for driving towards a cost effective and efficient design of a thermal management system for various applications.[1, 2] because of the increase in battery cell dimensions associated with an increase in battery cell capacity to drive towards a reduction in range anxiety for automotive applications, as well as more aggressive operating conditions that are typically seen in the automotive industry, such as direct current fast charge and sustained driving under load, heat generation at the cell level must be cons

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32

Börjesson Axén, Jenny, Henrik Ekström, Erika Widenkvist Zetterström, and Göran Lindbergh. "Modelling Nickel Metal Hydride Batteries for System Integrated Applications." ECS Meeting Abstracts MA2022-02, no. 1 (2022): 4. http://dx.doi.org/10.1149/ma2022-0214mtgabs.

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The NiMH battery is resilient against mistreatment and can be charged in a large temperature window. It also has a high power-capability, which has made it popular in for instance power tools. Today, the battery is often found in large scale stationary energy storage, as well as applications which require high power capability. In large scale energy storage, small differences in run cycles can have large total effects on power efficiency and safety. It is therefore desirable to develop better methods of battery management. In recent years, development in system hardware has made it possible to

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Carson, James K. "Modelling Thermal Diffusivity of Heterogeneous Materials Based on Thermal Diffusivities of Components with Implications for Thermal Diffusivity and Thermal Conductivity Measurement." International Journal of Thermophysics 43, no. 7 (2022). http://dx.doi.org/10.1007/s10765-022-03037-6.

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AbstractEffective thermal diffusivity models are useful for predicting thermal diffusivities of heterogeneous materials. The literature contains models that may be broadly categorised into four different types: (1) effective thermal diffusivity for highly specific applications (e.g. empirical curve fitting of measured data); (2) effective thermal diffusivity as a weighted averages of the components’ thermal diffusivities and volume fractions; (3) effective thermal diffusivity calculated from effective thermal conductivity, effective density and effective specific heat capacity known as the ‘lu

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34

El-Jummah, A. M., R. A. A. Abdul Husain, G. E. Andrews, and J. E. J. Staggs. "Conjugate Heat Transfer Computational Fluid Dynamic Predictions of Impingement Heat Transfer: The Influence of Hole Pitch to Diameter Ratio X/D at Constant Impingement Gap Z." Journal of Turbomachinery 136, no. 12 (2014). http://dx.doi.org/10.1115/1.4028232.

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Conjugate heat transfer (CHT) computational fluid dynamic (CFD) predictions were carried out for a 10 × 10 square array of impingement holes, for a range of pitch to diameter ratio X/D from 1.9 to 11.0 at a constant impingement gap Z of 10 mm and pitch X of 15.24 mm. The variation of X/D changes the impingement wall pressure loss for the same coolant mass flow rate and also changes the interaction with the impingement gap cross-flow. The experimental technique to determine the surface averaged heat transfer used the lumped capacity method with Nimonic-75 metal walls with imbedded thermocouples

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35

Tajik, Jamalabad Milad, Cristobal Cortés, Javier Pallarés, Antonia Gil, and Inmaculada Arauzo. "Comparison of Different Numerical Models for Solidification of Paraffin-Based PCMs and Evaluation of the Effect of Variable Mushy Zone Constant." Energies 2024 17(23), no. 5982 (2024). https://doi.org/10.3390/en17235982.

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The impact of the mushy zone parameter (𝐴𝑚𝑢𝑠ℎ𝑦Amushy) and the chosen numerical model during the solidification of a commercial paraffin-type phase change material (PCM) in a vertical cylinder under T-history conditions was examined through numerical simulations. The cooling process was modeled using three methods implemented in the CFD software ANSYS Fluent 2020 R2: the enthalpy–porosity method, the apparent heat capacity (AHC) method, and a new model proposed by the authors which incorporates heat capacity directly into ANSYS Fluent. To accurately define the boundary conditions, radiati

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36

Ghazi Wakili, Karim, Wolfgang Rädle, and Thomas Rohner. "Measuring the Specific Heat Capacity of Thermal Insulation Materials Used in Buildings by Means of a Guarded Hot Plate Apparatus." International Journal of Thermophysics 44, no. 1 (2022). http://dx.doi.org/10.1007/s10765-022-03133-7.

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AbstractThe specific heat capacity of building insulation materials is rather difficult to be determined using the conventional calorimetric methods. This is due to the small samples required for these methods which are not representative of the insulation material. Larger samples would not fulfill the requirements of the lumped system. Methods based on the transient heat transfer using heating wires or planes are commonly quick but less accurate measurements as they only consider the volume near the surface of the sample and need additional corrections and calibrations. The present investigat

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37

Ostadhossein, Rouhollah, and Siamak Hoseinzadeh. "The solution of Pennes' bio-heat equation with a convection term and nonlinear specific heat capacity using Adomian decomposition." Journal of Thermal Analysis and Calorimetry, July 12, 2022. http://dx.doi.org/10.1007/s10973-022-11445-x.

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AbstractPennes' bio-heat equation is the most widely used equation to analyze the heat transfer phenomenon associated with hyperthermia and cryoablation treatments of cancer. In this study, the semi-analytical and numerical solutions of Pennes' equation in a highly nonlinear form derived from renal cell carcinoma tissue's nonlinear specific heat capacity along with a freezing convection term were obtained and analyzed for the first time. Here, the governing equation was reduced to a lumped capacity form for simplification and exerted on a solid spherical renal tumor. In the following, two semi

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Jančík, Petr, Michal Schmirler, Tomáš Hyhlík, et al. "Experimental investigation and modelling of a laboratory-scale latent heat storage with cylindrical PCM capsules." Scientific Reports 11, no. 1 (2021). http://dx.doi.org/10.1038/s41598-021-02705-1.

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AbstractHeat storage efficiency is required to maximize the potential of combined heat and power generation or renewable energy sources for heating. Using a phase change material (PCM) could be an attractive choice in several instances. Commercially available paraffin-based PCM was investigated using T-history method with sufficient agreement with the data from the manufacturer. The introduced LHTES with cylindrical capsules is simple and scalable in capacity, charging/discharging time, and temperature level. The overall stored energy density is 9% higher than the previously proposed design of

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Берже, Жулиан, and Денис Дутых. "Evaluation of the reliability of building energy performance models for parameter estimation." Вычислительные технологии, no. 3(24) (June 17, 2019). http://dx.doi.org/10.25743/ict.2019.24.3.002.

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The fidelity of a model relies both on its accuracy to predict the physical phenomena and its capability to estimate unknown parameters using observations. This article focuses on this second aspect by analyzing the reliability of two mathematical models proposed in the literature for the simulation of heat losses through building walls. The first one, named DF, is the classical heat diffusion equation combined with the DuFort-Frankel numerical scheme. The second is the so-called RC lumped approach, based on a simple ordinary differential equation to compute the temperature within the wall. Th

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