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Готові списки джерел за темами / Thermal lag / Статті в журналах

Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Thermal lag.

Статті в журналах з теми "Thermal lag"

Автор: Grafiati

Опубліковано: 28 травня 2022

Оновлено: 31 липня 2025

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1

Alborzi, Mojtaba, Faramarz Sarhaddi, and Fatemeh Sobhnamayan. "Optimization of the thermal lag Stirling engine performance." Energy & Environment 30, no. 1 (2018): 156–75. http://dx.doi.org/10.1177/0958305x18787307.

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In this paper, neural network and genetic algorithm is used to obtain the optimal output power of thermal lag Stirling engine. A neural network is trained and developed using the theoretical data of previous literatures in order to predict the performance of Stirling engine. Input parameters to neural network include angular velocity, thermal resistance, stroke length radius, piston diameter, the volume of heat buffer chamber and the volume of gas chamber, and output parameter includes output power. The accuracy of neural network is evaluated by average square error and regression analysis. Al

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2

Cheng, Chin-Hsiang, Hang-Suin Yang, Bing-Yi Jhou, Yi-Cheng Chen, and Yu-Jen Wang. "Dynamic simulation of thermal-lag Stirling engines." Applied Energy 108 (August 2013): 466–76. http://dx.doi.org/10.1016/j.apenergy.2013.03.062.

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3

Yang, Hang-Suin, and Chin-Hsiang Cheng. "Stability analysis of thermal-lag Stirling engines." Applied Thermal Engineering 106 (August 2016): 712–20. http://dx.doi.org/10.1016/j.applthermaleng.2016.06.009.

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4

Phung, Duc-Thuan, and Chin-Hsiang Cheng. "Investigating dynamic characteristics and thermal-lag phenomenon in a thermal-lag engine using a CFD-mechanism dynamics model." Applied Thermal Engineering 236 (January 2024): 121926. http://dx.doi.org/10.1016/j.applthermaleng.2023.121926.

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5

Kwon, Ohmyoung, Li Shi, and Arun Majumdar. "Scanning Thermal Wave Microscopy (STWM)." Journal of Heat Transfer 125, no. 1 (2003): 156–63. http://dx.doi.org/10.1115/1.1518492.

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This paper presents a technique, scanning thermal wave microscopy (STWM), which can image the phase lag and amplitude of thermal waves with sub-micrometer resolution by scanning a temperature-sensing nanoscale tip across a sample surface. Phase lag measurements during tip-sample contact showed enhancement of tip-sample heat transfer due to the presence of a liquid film. The measurement accuracy of STWM is proved by a benchmark experiment and comparison to theoretical prediction. The application of STWM for sub-surface imaging of buried structures is demonstrated by measuring the phase lag and

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6

Czajka, Krzysztof M. "Gasification of Coal by CO2: The Impact of the Heat Transfer Limitation on the Progress, Reaction Rate and Kinetics of the Process." Energies 14, no. 17 (2021): 5569. http://dx.doi.org/10.3390/en14175569.

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This paper presents the impact of thermal lag on the progress of different coal types’ gasification by CO2. The analysis was performed using thermogravimetry and numerical modeling. Experiments were carried out at a heating rate of 1–50 Kmin−1 and a temperature ranging from 383 to 1173 K. The developed numerical model enabled the determination of a true sample temperature considering the gasification process to consist of two single-step consecutive reactions. Analysis revealed that the average thermal lag in CO2 is about 11% greater than that in N2, which is related to the properties of CO2 i

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7

Alavéz-Ramírez, Rafael, Fernando Chiñas-Castillo, Valentín Juventino Morales-Domínguez, Margarito Ortiz-Guzmán, José Luis Caballero-Montes, and Magdaleno Caballero-Caballero. "Thermal lag and decrement factor of constructive component reinforced mortar channels filled with soil–cement–sawdust." Indoor and Built Environment 27, no. 4 (2016): 466–85. http://dx.doi.org/10.1177/1420326x16676611.

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In the last years, people has become aware of energy saving and thermal comfort requirements for home buildings in hot and cold seasons. In the present study, hybrid multifunctional constructive components made of a reinforced mortar channel filled with cement–soil–sawdust (CL2MSCAL) were evaluated to experimentally determine their thermal performance (thermal conductivity, thermal time lag and decrement factor). The experimental analysis performed in this study was based on dynamic climatology. Measurements of components surface temperature were conducted to determine temperature damping and

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8

Jong van Lier, Quirijn de, and Angelica Durigon. "Soil thermal diffusivity estimated from data of soil temperature and single soil component properties." Revista Brasileira de Ciência do Solo 37, no. 1 (2013): 106–12. http://dx.doi.org/10.1590/s0100-06832013000100011.

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Under field conditions, thermal diffusivity can be estimated from soil temperature data but also from the properties of soil components together with their spatial organization. We aimed to determine soil thermal diffusivity from half-hourly temperature measurements in a Rhodic Kanhapludalf, using three calculation procedures (the amplitude ratio, phase lag and Seemann procedures), as well as from soil component properties, for a comparison of procedures and methods. To determine thermal conductivity for short wave periods (one day), the phase lag method was more reliable than the amplitude ra

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9

Garau, Bartolomé, Simón Ruiz, Weifeng G. Zhang, et al. "Thermal Lag Correction on Slocum CTD Glider Data." Journal of Atmospheric and Oceanic Technology 28, no. 9 (2011): 1065–71. http://dx.doi.org/10.1175/jtech-d-10-05030.1.

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Abstract In this work a new methodology is proposed to correct the thermal lag error in data from unpumped CTD sensors installed on Slocum gliders. The advantage of the new approach is twofold: first, it takes into account the variable speed of the glider; and second, it can be applied to CTD profiles from an autonomous platform either with or without a reference cast. The proposed methodology finds values for four correction parameters that minimize the area between two temperature–salinity curves given by two CTD profiles. A field experiment with a Slocum glider and a standard CTD was conduc

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10

O¨zis¸ik, M. N., and D. Y. Tzou. "On the Wave Theory in Heat Conduction." Journal of Heat Transfer 116, no. 3 (1994): 526–35. http://dx.doi.org/10.1115/1.2910903.

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This work contains three major components: a thorough review on the research emphasizing engineering applications of the thermal wave theory, special features in thermal wave propagation, and the thermal wave model in relation to the microscopic two-step model. For the sake of convenience, the research works are classified according to their individual emphases. Special features in thermal wave propagation include the sharp wavefront and rate effects, the thermal shock phenomenon, the thermal resonance phenomenon, and reflections and refractions of thermal waves across a material interface. By

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11

Cheng, Chin-Hsiang, and Duc-Thuan Phung. "Modeling of Thermal-Lag Engine with Validation by Experimental Data." Energies 15, no. 20 (2022): 7688. http://dx.doi.org/10.3390/en15207688.

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Thermal-lag engines are external combustion engines with a single moving piston. This feature leads to lower manufacturing and maintenance costs than traditional Stirling engines. Although the original concept of thermal-lag engines was invented roughly 35 years ago, the information on thermal-lag engines is still limited. Therefore, this study focuses on thermal-lag engine performance by developing a three-dimensional computational fluid dynamics (CFD) model. The grid independence check and the time step independence check are firstly performed to select the number of elements and size of the

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12

Liu, Kuo Chi, Cheng Chi Wang, and Po Jen Cheng. "Analysis of Non-Fourier Thermal Behavior in Layered Tissue with Pulse Train Heating." Applied Mechanics and Materials 479-480 (December 2013): 496–500. http://dx.doi.org/10.4028/www.scientific.net/amm.479-480.496.

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This paper investigates the thermal behavior in laser-irradiated layered tissue, which was stratified into skin, fat, and muscle. A modified nonFourier equation of bio-heat transfer was developed based on the second-order Taylor expansion of dual-phase lag model. This equation is a fourth order partial differential equation and can be simplified as the bio-heat transfer equations derived from Pennes model, thermal wave model, and the linearized form of dual-phase lag model. The boundary conditions at the interface between two adjacent layers become complicated. There are mathematical difficult

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13

Semenets, D. "DESIGN OF DIGITAL CONTROLLER FOR THERMAL INERTIAL OBJECT WITH DELAY." Znanstvena misel journal, no. 90 (May 27, 2024): 112–17. https://doi.org/10.5281/zenodo.11358618.

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The paper considers modern methods of regulator tuning for controlling inertial objects with a transport lag link and presents the results of computer modelling at non-stationary lag time. The methodology of tuning analogue and digital automatic systems with PID-regulator with reduced sensitivity to the variation of parameters of the control object is proposed

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14

Yuan, Jihui. "Impact of Insulation Type and Thickness on the Dynamic Thermal Characteristics of an External Wall Structure." Sustainability 10, no. 8 (2018): 2835. http://dx.doi.org/10.3390/su10082835.

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The dynamic thermal characteristics of external wall structures are directly related to indoor thermal comfort and energy savings in buildings; they are also complicated and worth investigating. Thermal insulation in external wall structures has become a popular topic of investigation in the domain of building energy efficiency. This study aims to find the impact of insulation type and thickness on the dynamic thermal characteristics of external wall structures using a homogeneous multi-layer building external wall structure and three types of insulation materials that are widely used in Japan

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15

Zhang, Qing Zhi, Gang Wu, Zhi Yang Pang, Jin Zeng Chen, Guang Hua Li, and Ke Bi. "Numerical Simulation of Cu-Cu Interface Thermal Resistance by Utilizing Laser Photothermal Method." Applied Mechanics and Materials 117-119 (October 2011): 195–200. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.195.

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By using the high purity Cu samples as the study objects and based on the experimental measurement results of the interface thermal resistance, the study on the relations between the interface thermal resistance, the laser modulation frequency and the phase lag under different temperatures has been carried out through the Matlab numerical simulation. It is shown that the corresponding phase lag is increasingly bigger but the interface thermal resistance is increasingly smaller while the interface temperature become higher at a certain pressure; furthermore, the study on relation between the in

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16

Alkhalaeileh Islam and McKenzie-Lambert. Prisca. "Thermal lag and principles of saturation pressure in sustainability." World Journal of Advanced Engineering Technology and Sciences 12, no. 1 (2024): 421–27. http://dx.doi.org/10.30574/wjaets.2024.12.1.0258.

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This research delves into exploring the concepts of measuring saturation pressure and the connection between pressure and temperature in turning a liquid into vapor. In this experiment, the goal is to grasp how saturation pressure is measured by studying how thermal insulation affects predictions of saturation pressure. The results indicate difficulties in making accurate predictions because of insufficient insulation emphasizing the importance of thorough insulation methods to counteract thermal lagging effects. This experiment provides insights into how theory and experimentation interact in

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17

Fayik, Mohsen, Sharifah E. Alhazmi, Mohamed A. Abdou, and Emad Awad. "Transient Finite-Speed Heat Transfer Influence on Deformation of a Nanoplate with Ultrafast Circular Ring Heating." Mathematics 11, no. 5 (2023): 1099. http://dx.doi.org/10.3390/math11051099.

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The present study provides a theoretical estimate for the thermal stress distribution and the displacement vector inside a nano-thick infinite plate due to an exponentially temporal decaying boundary heating on the front surface of the elastic plate. The surface heating is in the form of a circular ring; therefore, the axisymmetric formulation is adopted. Three different hyperbolic models of thermal transport are considered: the Maxwell-Cattaneo-Vernotte (MCV), hyperbolic Dual-Phase-Lag (HDPL) and modified hyperbolic Dual-Phase-Lag (MHDPL), which coincides with the two-step model under certain

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18

Comesaña, Roberto, Miguel A. Gómez, Miguel A. Álvarez, and Pablo Eguía. "Thermal lag analysis on a simulated TGA-DSC device." Thermochimica Acta 547 (November 2012): 13–21. http://dx.doi.org/10.1016/j.tca.2012.08.008.

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19

Cimmelli, Vito Antonio. "Mesoscopic approach to inviscid gas dynamics with thermal lag." Annalen der Physik 525, no. 12 (2013): 921–33. http://dx.doi.org/10.1002/andp.201300066.

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20

Stübinger, Johannes, and Dominik Walter. "Using Multi-Dimensional Dynamic Time Warping to Identify Time-Varying Lead-Lag Relationships." Sensors 22, no. 18 (2022): 6884. http://dx.doi.org/10.3390/s22186884.

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This paper develops a multi-dimensional Dynamic Time Warping (DTW) algorithm to identify varying lead-lag relationships between two different time series. Specifically, this manuscript contributes to the literature by improving upon the use towards lead-lag estimation. Our two-step procedure computes the multi-dimensional DTW alignment with the aid of shapeDTW and then utilises the output to extract the estimated time-varying lead-lag relationship between the original time series. Next, our extensive simulation study analyses the performance of the algorithm compared to the state-of-the-art me

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21

Mittal, Gaurav, and Vinayak Kulkarni. "Dual-phase-lag thermoelastic problem in finite cylindrical domain with relaxation time." Multidiscipline Modeling in Materials and Structures 14, no. 5 (2018): 837–56. http://dx.doi.org/10.1108/mmms-03-2018-0041.

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Purpose The purpose of this paper is to frame a dual-phase-lag model using the fractional theory of thermoelasticity with relaxation time. The generalized Fourier law of heat conduction based upon Tzou model that includes temperature gradient, the thermal displacement and two different translations of heat flux vector and temperature gradient has been used to formulate the heat conduction model. The microstructural interactions and corresponding thermal changes have been studied due to the involvement of relaxation time and delay time translations. This results in achieving the finite speed of

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22

Zhang, Xiaoyang, Zhi Cao, Shanlai Wang, Lei Yao, and Haitao Yu. "High-Speed Temperature Control Method for MEMS Thermal Gravimetric Analyzer Based on Dual Fuzzy PID Control." Micromachines 14, no. 5 (2023): 929. http://dx.doi.org/10.3390/mi14050929.

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The traditional thermal gravimetric analyzer (TGA) has a noticeable thermal lag effect, which restricts the heating rate, while the micro-electro-mechanical system thermal gravimetric analyzer (MEMS TGA) utilizes a resonant cantilever beam structure with high mass sensitivity, on-chip heating, and a small heating area, resulting in no thermal lag effect and a fast heating rate. To achieve high-speed temperature control for MEMS TGA, this study proposes a dual fuzzy proportional-integral-derivative (PID) control method. The fuzzy control adjusts the PID parameters in real-time to minimize overs

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23

Held, Loren E., and Henrik N. Latter. "The stress–pressure lag in MRI turbulence and its implications for thermal instability in accretion discs." Monthly Notices of the Royal Astronomical Society 510, no. 1 (2021): 146–53. http://dx.doi.org/10.1093/mnras/stab3398.

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ABSTRACT The classical alpha-disc model assumes that the turbulent stress scales linearly with – and responds instantaneously to – the pressure. It is likely, however, that the stress possesses a non-negligible relaxation time and will lag behind the pressure on some time-scale. To measure the size of this lag we carry out unstratified 3D magnetohydrodynamic shearing box simulations with zero-net-magnetic-flux using the finite-volume code pluto. We impose thermal oscillations of varying periods via a cooling term, which in turn drives oscillations in the turbulent stress. Our simulations revea

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24

Lim, Hong Soo, and Gon Kim. "Development of Regression Models considering Time-Lag and Aerosols for Predicting Heating Loads in Buildings." Advances in Civil Engineering 2018 (2018): 1–19. http://dx.doi.org/10.1155/2018/4878021.

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Building automation systems is becoming more vital, especially in regard to reduced building energy consumption. However, the accuracy of such systems in calculating building thermal loads is limited as they are unable to predict future thermal loads based on prevailing environmental factors. The current paper therefore seeks to improve the understanding of the interactions between outdoor meteorological data and building energy consumption through a statistical analysis. Using weather data collected by the Korean Meteorological Agency (KMA) over a period of three years (2011–2014), prediction

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25

Rehman, Abdul, Rasim Ozcan, Waqar Badshah, Magdalena Radulescu, and Ilhan Ozturk. "Symmetric and Asymmetric Impacts of Commercial Energy Distribution from Key Sources on Economic Progress in Pakistan." Sustainability 13, no. 22 (2021): 12670. http://dx.doi.org/10.3390/su132212670.

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This paper aims to determine the interaction of commercial energy distribution, including the installed capacity of hydroelectric energy, hydroelectric energy generation, the installed capacity of thermal energy, thermal energy generation, the installed capacity of nuclear energy, and nuclear energy generation, with economic progress in Pakistan over the 1970–2019 period. Both linear and non-linear autoregressive distributed lag models were used to ascertain the symmetric and asymmetric short- and long-run effects. The findings from the linear autoregressive distributed lag model analysis reve

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26

Rippin, David M., Jonathan L. Carrivick, and Christopher Williams. "Evidence towards a thermal lag in the response of Kårsaglaciären, northern Sweden, to climate change." Journal of Glaciology 57, no. 205 (2011): 895–903. http://dx.doi.org/10.3189/002214311798043672.

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AbstractRecent topographical and ground-penetrating radar (GPR) surveys of Kårsaglaciären, which is a small (<1 km2) and thin (<56 m) mountain glacier in Arctic Sweden, show that there are small areas of temperate ice in the lowermost part of the glacier. This is curious because we would expect such a small and thin glacier to have a fully cold ablation zone. Specifically, with our analyses of present glacier geometry and thickness and of the prevailing climate, we are unable to explain the presence of temperate ice within the snout of Kårsaglaciären using prevailing models of glacier th

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27

Roura, P., and J. Farjas. "Analysis of the sensitivity and sample–furnace thermal-lag of a differential thermal analyzer." Thermochimica Acta 430, no. 1-2 (2005): 115–22. http://dx.doi.org/10.1016/j.tca.2005.01.020.

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28

Kollár, Matúš, and Jozef Štefko. "Control of the Indoor Climate in Summer Using the Thermophysical Properties of Wood Materials in Terms of Transient Thermal State." Key Engineering Materials 688 (April 2016): 167–74. http://dx.doi.org/10.4028/www.scientific.net/kem.688.167.

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The paper deals with the influence of wood-based thermal insulation in building envelope constructions to the summer comfort of indoor climate thorough their thermal accumulation properties. In this study, the optimum positions of thermal insulation (wood fibre insulation, cork board) were investigated numerically from the maximum decrement factor and the maximum time lag. Thermal mass material of the wall is formed from CLT (cross-laminated timber) with different thicknesses of layers. It depends on the position of the insulation material maintaining the total thickness of wall 240 mm. Totall

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29

AKBARZADEH, A. H., and Z. T. CHEN. "DUAL PHASE LAG HEAT CONDUCTION IN FUNCTIONALLY GRADED HOLLOW SPHERES." International Journal of Applied Mechanics 06, no. 01 (2014): 1450002. http://dx.doi.org/10.1142/s1758825114500021.

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In the present work, the dual phase lag heat conduction in functionally graded hollow spheres is investigated under spherically symmetric and axisymmetric thermal loading. The heat conduction equation is given based on the dual phase lag theory to consider the details of energy transport in the material in comparison with the non-Fourier hyperbolic heat conduction. All the material properties of the sphere are taken to vary continuously along the radial direction following a power-law with arbitrary non-homogeneity indices except the phase lags which are assumed to be constant for simplicity.

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30

Dryden, John R., and Frank Zok. "Thermal phase lag in a solid containing periodic planar cracks." International Journal of Heat and Mass Transfer 44, no. 21 (2001): 4035–46. http://dx.doi.org/10.1016/s0017-9310(01)00049-7.

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31

Li, Zheng-Yang, Tian-Xue Ma, A.-Li Chen, Yue-Sheng Wang, and Chuanzeng Zhang. "Thermal wave crystals based on the dual-phase-lag model." Results in Physics 19 (December 2020): 103371. http://dx.doi.org/10.1016/j.rinp.2020.103371.

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32

Narayan, Ravi, and Michael Jerry Antal. "Thermal Lag, Fusion, and the Compensation Effect during Biomass Pyrolysis†." Industrial & Engineering Chemistry Research 35, no. 5 (1996): 1711–21. http://dx.doi.org/10.1021/ie950368i.

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33

Svoboda, Roman, Luis Pérez Maqueda, Veronika Podzemná, Antonio Perejon, and Ondřej Svoboda. "Influence of DSC thermal lag on evaluation of crystallization kinetics." Journal of Non-Crystalline Solids 528 (January 2020): 119738. http://dx.doi.org/10.1016/j.jnoncrysol.2019.119738.

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34

Fdez-Aballí Altamirano, C., S. Moldenhauer, J. González Bayón, S. Verhelst, and M. De Paepe. "A two control volume model for the Thermal Lag Engine." Energy Conversion and Management 78 (February 2014): 565–73. http://dx.doi.org/10.1016/j.enconman.2013.11.010.

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35

Hutchinson, J. M., M. Ruddy, and M. R. Wilson. "Differential scanning calorimetry of polymer glasses: corrections for thermal lag." Polymer 29, no. 1 (1988): 152–59. http://dx.doi.org/10.1016/0032-3861(88)90215-7.

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36

Wang, Yanhui, Chenyi Luo, Shaoqiong Yang, Wei Ma, Wendong Niu, and Hualong Liu. "Modified Thermal Lag Correction of CTD Data from Underwater Gliders." Journal of Coastal Research 99, sp1 (2020): 137. http://dx.doi.org/10.2112/si99-020.1.

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37

Yang, Hang-Suin, and Chin-Hsiang Cheng. "Theoretical solutions for power output of thermal-lag Stirling engine." International Journal of Heat and Mass Transfer 111 (August 2017): 191–200. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.03.106.

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38

Melnikov, Valery M. "One-Lag Estimators for Cross-Polarization Measurements." Journal of Atmospheric and Oceanic Technology 23, no. 7 (2006): 915–26. http://dx.doi.org/10.1175/jtech1919.1.

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Abstract Estimators of the linear depolarization ratio (LDR) and cross-polarization correlation coefficients (ρxh) free from noise biases are devised. The estimators are based on the 1-lag correlation functions. The 1-lag estimators can be implemented with radar with simultaneous reception of copolar and cross-polar returns. Absence of noise biases makes the 1-lag estimators useful in eliminating variations of the system gain and in observations of heavy precipitation with enhanced thermal radiation. The 1-lag estimators allow for measurements at lower signal-to-noise ratios than the conventio

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39

Hatmaja, Rahaden Bagas, Rangga Amrullah, Shinta Ayu Kusumaningrum, and M. Restu Putra Sugianto. "The Atmospheric and Oceanic Processes on Thermal Front Variability over the Java Sea." Tropical Marine Environmental Sciences 2, no. 1 (2023): 17–20. http://dx.doi.org/10.31258/tromes.2.1.17-20.

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The Java Sea is influenced by various atmospheric and oceanographic factors such as monsoon winds and the inflow of water from adjacent seas, thus leading to the formation of thermal fronts. In this research, the atmospheric process over the thermal front was estimated by using sea surface temperature (SST) gradient and crosswind-SST gradient calculation based on the GLORYS12V1 monthly SST data from Copernicus Marine Service (CMEMS) and the ERA5 monthly surface wind data from European Centre for Medium-Range Weather Forecasts (ECMWF) for 27 years (from 1993 to 2019). Moreover, the oceanic proc

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40

Hatmaja, Rahaden Bagas, Rangga Amrullah, Shinta Ayu Kusumaningrum, and M. Restu Putra Sugianto. "The Atmospheric and Oceanic Processes on Thermal Front Variability over the Java Sea." Tropical Marine Environmental Sciences 2, no. 1 (2023): 17–20. https://doi.org/10.31258/tromes.2.01.17-20.

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The Java Sea is influenced by various atmospheric and oceanographic factors such as monsoon winds and the inflow of water from adjacent seas, thus leading to the formation of thermal fronts. In this research, the atmospheric process over the thermal front was estimated by using sea surface temperature (SST) gradient and crosswind-SST gradient calculation based on the GLORYS12V1 monthly SST data from Copernicus Marine Service (CMEMS) and the ERA5 monthly surface wind data from European Centre for Medium-Range Weather Forecasts (ECMWF) for 27 years (from 1993 to 2019). Moreover, the oceanic proc

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Espinosa-Fernández, Almudena, Víctor Echarri-Iribarren, and Claudio A. Sáez. "Water-Covered Roof Versus Inverted Flat Roof on the Mediterranean Coast: A Comparative Study of Thermal and Energy Behavior." Applied Sciences 10, no. 7 (2020): 2288. http://dx.doi.org/10.3390/app10072288.

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Reservoir, or water-collecting roofs present greater thermal inertia than inverted flat roofs due to the mass of water they contain. This feature gives them better thermal performance and leads to greater stability in the indoor air temperature Ti and the wall surface temperatures. In the summer, they can dampen the effect of solar radiation and regulate external thermal loads thanks to their greater effusivity and thermal capacity. This research compares the thermal behavior of the roofs of two buildings located in Alicante on the Spanish Mediterranean coast: a loft flat in the city center an

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Chen, Qicheng, Junting Wu, Kanglong Sun, and Yingjin Zhang. "Numerical Study of Heat Transfer Enhancement by Arc-Shaped Fins in a Shell-Tube Thermal Energy Storage Unit." Energies 15, no. 20 (2022): 7799. http://dx.doi.org/10.3390/en15207799.

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Latent heat thermal energy storage (LHTES) technology can alleviate the mismatch between the supply and demand of solar energy and industrial waste heat, but the low thermal conductivity of phase change materials (PCMs) is an issue that needs to be solved. In this work, the effects of the bifurcated fins on melting and solidification are studied, and local and global entropy generation are discussed. The radial lag time and the circumferential lag time were defined to evaluate thermal penetration and thermal uniformity. Subsequently, a novel arc-shaped fin configuration was proposed to further

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Requia, Weeberb J., Reizane Maria Damasceno da Silva, Leonardo Hoinaski, and Heresh Amini. "Thermal Comfort Conditions and Mortality in Brazil." International Journal of Environmental Research and Public Health 21, no. 9 (2024): 1248. http://dx.doi.org/10.3390/ijerph21091248.

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Conventional temperature-based approaches often overlook the intricate nature of thermal stress experienced by individuals. To address this limitation, climatologists have developed thermal indices—composite measures designed to reflect the complex interaction of meteorological factors influencing human perception of temperature. Our study focuses on Brazil, estimating the association between thermal comfort conditions and mortality related to respiratory and circulatory diseases. We examined four distinct thermal indices: the discomfort index (DI), net effective temperature (NET), humidex (H)

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Kumar, Rajneesh, Nidhi Sharma, and Parveen Lata. "Effects of thermal and diffusion phase-lags in a plate with axisymmetric heat supply." Multidiscipline Modeling in Materials and Structures 12, no. 2 (2016): 275–90. http://dx.doi.org/10.1108/mmms-08-2015-0042.

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Purpose – The purpose of this paper is to depict the effect of time and thermal and diffusion phase-lags due to axisymmetric heat supply in a ring. The problem is discussed within the context of dual-phase-lag heat transfer and dual-phase-lag diffusion models. The upper and lower surfaces of the ring are traction free and subjected to an axisymmetric heat supply. Design/methodology/approach – The solution is found by using Laplace and Hankel transform technique and a direct approach without the use of potential functions. The analytical expressions of displacements, stresses and chemical poten

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Miao, En Ming, Xin Wang, Ye Tai Fei, and Yan Yan. "Application of Autoregressive Distributed Lag (ADL) Model to Thermal Error Modeling on NC Machine Tools." Applied Mechanics and Materials 103 (September 2011): 9–14. http://dx.doi.org/10.4028/www.scientific.net/amm.103.9.

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Thermal error modeling method is an important field of thermal error compensation on NC machine tools, it is also a key for improving the machining accuracy of machine tools. The accuracy of the model directly affects the quality of thermal error compensation. On the basis of multiple linear regression (MLR) model, this paper proposes an autoregressive distributed lag (ADL) model of thermal error and establishes an accurate ADL model by stepwise regression analysis. The ADL model of thermal error is established with measured data, it proved the ADL model is available and has a high accuracy on

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Zhang, Yun Xia, San Xiang Sun, and Tian Peng Wang. "The Influence of Wall Orientation and Exterior Surface Solar Absorptivity on Time Lag and Decrement Factor." Advanced Materials Research 113-116 (June 2010): 161–64. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.161.

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In this work, an analysis and numerical study have been carried out in order to determine how time lag and decrement factor are affected by wall orientation and exterior surface solar absorptivity for specific climatic conditions in Budongquan station of Qinghai-Tibet railway. The model employing a dynamic thermal-network simulates heat transfer through the wall according to the measured data. The time lag and decrement factor with different wall orientation and surface absorptivity are investigated based on the hourly heat flow density from outside to inside of building wall. The results of p

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Ying Kong, Sih, Xu Yang, Suvash Chandra Paul, Leong Sing Wong, and Branko Šavija. "Thermal Response of Mortar Panels with Different Forms of Macro-Encapsulated Phase Change Materials: A Finite Element Study." Energies 12, no. 13 (2019): 2636. http://dx.doi.org/10.3390/en12132636.

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This paper presents a numerical investigation of thermal response of mortar panels, incorporating macro-encapsulated paraffin in different forms. Two types of macro capsules were fabricated and tested in this study using an instrumented hot plate device. The experimental results show that macro encapsulated paraffin reduced the temperature and increased time lag in the mortar panels due to the latent heat capacity of paraffin. Finite element models adopting the effective heat capacity method to model phase change effects were able to capture the overall thermal response of panels incorporated

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Akbarzadeh, AH, and ZT Chen. "Heat conduction in one-dimensional functionally graded media based on the dual-phase-lag theory." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 4 (2012): 744–59. http://dx.doi.org/10.1177/0954406212456651.

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In this article, heat conduction in one-dimensional functionally graded media is investigated based on the dual-phase-lag theory to consider the microstructural interactions in the fast transient process of heat conduction. All material properties of the media are assumed to vary continuously according to a power-law formulation with arbitrary non-homogeneity indices except the phase lags which are taken constant for simplicity. The one-dimensional heat conduction equations based on the dual-phase-lag theory are derived in a unified form which can be used for Cartesian, cylindrical, and spheri

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Luo, Xichun, Zhipeng Li, Wenlong Chang, et al. "Laser-assisted grinding of reaction-bonded SiC." Journal of Micromanufacturing 3, no. 2 (2020): 93–98. http://dx.doi.org/10.1177/2516598420965342.

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The article presents the development of a novel laser-assisted grinding (LAG) process to reduce surface roughness and subsurface damage in grinding reaction-bonded silicon carbide (RB-SiC). A thermal control approach is proposed to facilitate the process development, in which a two-temperature model (TTM) is applied to control the required laser power to thermal softening of RB-SiC prior to the grinding operation without melting the workpiece or leaving undesirable microstructural alteration. Fourier’s law is adopted to obtain the thermal gradient for verification. An experimental comparison o

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Kumar, Rajneesh, and Vandana Gupta. "Plane wave propagation in an anisotropic dual-phase-lag thermoelastic diffusion medium." Multidiscipline Modeling in Materials and Structures 10, no. 4 (2014): 562–92. http://dx.doi.org/10.1108/mmms-01-2014-0004.

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Purpose – The purpose of this paper is to depict the effect of thermal and diffusion phase-lags on plane waves propagating in thermoelastic diffusion medium with different material symmetry. A generalized form of mass diffusion equation is introduced instead of classical Fick's diffusion theory by using two diffusion phase-lags, one phase-lag of diffusing mass flux vector, represents the delayed time required for the diffusion of the mass flux and the other phase-lag of chemical potential, represents the delayed time required for the establishment of the potential gradient. The basic equations

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