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Статті в журналах з теми "Thermal Performance Factor"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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1

Soumadeep, Chatterjee, and Banerjee Soubhonik. "Graphical Analysis of Heat Transfer Enhancement Techniques Thermal Performance Factor." Research and Applications of Thermal Engineering 3, no. 3 (2021): 1–10. https://doi.org/10.5281/zenodo.4433453.

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<em>Heat transfer enhancements are of several types and have the potential to reduce the size of the equipment. Several researchers have continued studying about this topic and made significant improvements in this field. These innovations have reduced cost and size of devices over time. Many devices are becoming affordable and efficient because of such studies. Hence the Heat Transfer Enhancement techniques are really an important factor in technology. Now an essential parameter in this heat transfer enhancement field is the thermal performance factor, which decides the transfer of heat rate

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2

Mohd Rosli, Mohd Afzanizam, Sohif Mat, Kamaruzzaman Sopian, Mohd Yusof Sulaiman, Elias Ilias Salleh, and Mohd Khairul Anuar Sharif. "Thermal Performance on Unglazed Photovoltaic Thermal Polymer Collector." Advanced Materials Research 911 (March 2014): 238–42. http://dx.doi.org/10.4028/www.scientific.net/amr.911.238.

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In this study, the thermal efficiency of a polymer collector with unglazed photovoltaic thermal (PVT) system was determined. Overall heat loss was estimated using the heat energy balance method. Based on the analysis, the heat removal factor of the PVT system was found to be 0.55. The thermal performance of the system was 47% during the zero reduce temperature. The unglazed PVT polymer collector could replace the conventional PVT collector, which encountered problems such as high cost, weighting issues, and corrosion.

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3

Wijayanta, Agung, Muhammad Aziz, Keishi Kariya, and Akio Miyara. "Numerical Study of Heat Transfer Enhancement of Internal Flow Using Double-Sided Delta-Winglet Tape Insert." Energies 11, no. 11 (2018): 3170. http://dx.doi.org/10.3390/en11113170.

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A numerical study was performed to investigate the thermal performance characteristics of an enhanced tube heat exchanger fitted with punched delta-winglet vortex generators. Computational fluid dynamics modeling was applied using the k–ε renormalized group turbulence model. Benchmarking was performed using the results of the experimental study for a similar geometry. Attack angles of 30°, 50°, and 70° were used to investigate the heat transfer and pressure drop characteristics of the enhanced tube. Flow conditions were considered in the turbulent region in the Reynolds number range of 9100 to

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4

Mohammed, Baraa, and Saad Najeeb Shehab. "A COMPREHENSIVE REVIEW STUDY ON HEAT TRANSFER IMPROVEMENT TECHNIQUES WITHIN TWISTED TUBES." Journal of Engineering and Sustainable Development 27, no. 6 (2023): 823–39. http://dx.doi.org/10.31272/jeasd.27.6.12.

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Heat transfer equipment has been used in many different domestic and industrial applications. There has been a concentrated effort to create a heat exchanger design that will reduce energy requirements while saving materials and other costs. Increasing the effective heat transfer surface area or creating turbulence are two common ways to improve heat transfer and hence lower thermal resistance. The thermal Performance Factor is the ratio of the difference in heat transfer rate to the difference in friction factor and serves as a metric to assess the efficiency of heat transfer enhancement tech

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5

Lu, Gao, Wen Yan Wang, and Jing Pei Xie. "The Thermal Fatigue Performance for Cast Iron Brake Drum of Large Trucks." Applied Mechanics and Materials 117-119 (October 2011): 821–23. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.821.

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This paper studies the application in different cast iron brake drum the thermal fatigue properties of materials. The results show that the stress concentration factor of grey cast iron, hot fatigue crack initiation, low intensity, and easy to expand, organization crack initiation poor stability, antioxidant ability is poor, thermal fatigue is poorer. 35% of vermicular cast iron and of ductile iron high strength, toughness, good stress concentration factor small, thermal fatigue is well.

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6

Maradiya, Chirag, Jeetendra Vadher, and Ramesh Agarwal. "The heat transfer enhancement techniques and their Thermal Performance Factor." Beni-Suef University Journal of Basic and Applied Sciences 7, no. 1 (2018): 1–21. http://dx.doi.org/10.1016/j.bjbas.2017.10.001.

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7

Lee, Seung Woo, and J. S. Park. "Evaluating thermal performance of double-skin facade using response factor." Energy and Buildings 209 (February 2020): 109657. http://dx.doi.org/10.1016/j.enbuild.2019.109657.

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8

Obodeh, O., and F. O. Isaac. "Performance Indicators for Sapele Thermal Power Station, Nigeria: 1997-2006." Advanced Materials Research 367 (October 2011): 667–75. http://dx.doi.org/10.4028/www.scientific.net/amr.367.667.

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Performance indices as measured by percentage of shortfall of energy generated, load factor, utilization factor and capacity factor of Sapele thermal power station, Nigeria in the period 1997 to 2006 is presented. The thermal station uses both steam and gas turbines. The station consists of six units of steam turbine and four units of gas turbine with total installed capacity of 1020 MW. But it was established that less than 17 % of the installed capacity was available. The percentage shortfall of energy generated for the period under review ranged from 27.4 to 49.1 %. This was due to aging of

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9

Pukhkal, Viktor, and Vera Murgul. "Effect of aerated concrete blockwork joints on the heat transfer performance uniformity." E3S Web of Conferences 33 (2018): 02002. http://dx.doi.org/10.1051/e3sconf/20183302002.

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Analysis of data on the effect of joints of the aerated concrete blocks on the heat transfer uniformity of exterior walls was carried out. It was concluded, that the values of the heat transfer performance uniformity factor in the literature sources were obtained for the regular fragment of a wall construction by approximate addition of thermal conductivities. Heat flow patterns for the aerated concrete exterior walls amid different values of the thermal conductivity factors and design ambient air temperature of -26 °C were calculated with the use of “ELCUT” software for modelling of thermal p

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10

Andrikaki, S., K. Govatsi, S.N. Yannopoulos, G.A. Voyiatzis, and K.S. Andrikopoulos. "Thermal dewetting tunes surface enhanced resonance Raman scattering (SERRS) performance." RSC Advances 8, no. 51 (2019): 29062–70. https://doi.org/10.1039/c8ra05451g.

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Surface Enhanced Raman Spectroscopy (SERS) belongs to the techniques of ultra-sensitive chemical analysis and involves both identification and quantification of molecular species. Despite the fact that theoretically derived enhancement factors imply that even single molecules may be identified, which in some cases has indeed been experimentally observed, the application of this specific technique as an analytical tool is still an open field of research due to the need for reproducible, stable and simple to prepare SERS active substrates. The current work attempts to contribute to the already e

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11

Jiang, Peng, Hua Yan, Zhen Zhang, Yu Mei Ding, and Wei Min Yang. "Simulation of Circular Tubes Fitted with V Cut and Square Cut Rotors." Key Engineering Materials 561 (July 2013): 547–52. http://dx.doi.org/10.4028/www.scientific.net/kem.561.547.

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This work presents the effect of V cut and square cut rotors in circular tubes for turbulent heat transfer using computational fluid dynamics (CFD) modeling. The computational results are in good agreement with experimental data. The obtained results reveal that the use of square cut rotors leads to higher Nusselt number than use of V cut rotors. The results also show that the heat transfer rate, friction factor and thermal performance factor of rotors with square cut increase with the increase of width (a) and depth (b) of rotors’ cut. Square cut rotors with a=b=3 yields higher mean thermal p

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12

YAMADA, Noboru, Tomoaki SHINODA, and Hiroyuki TAKIZAWA. "Performance of Hemisphere Algorithm for Fast Form Factor Calculation(Thermal Engineering)." Transactions of the Japan Society of Mechanical Engineers Series B 75, no. 749 (2009): 132–39. http://dx.doi.org/10.1299/kikaib.75.749_132.

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13

Ahn, Seung-Yong, and Kwang-Yong Kim. "Thermal Performance of T-shaped Obstacles in a Solar Air Heater." Processes 8, no. 10 (2020): 1305. http://dx.doi.org/10.3390/pr8101305.

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This paper proposes T-shaped ribs as obstacles attached to the heat absorber plate in a rectangular solar air heater to promote heat transfer. The thermal and aerodynamic performance of the solar heater was numerically evaluated using three-dimensional Reynolds-averaged Navier–Stokes equations with the shear stress transport turbulence model. A parameter study was performed using the ratios of rib height to channel height, rib width to channel width, and rib width to rib height. The area-averaged Nusselt number and friction factor were selected as the performance parameters of the solar air he

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14

Li, Lin, Yuan Liu, Jiyan Dai, et al. "High thermoelectric performance of superionic argyrodite compound Ag8SnSe6." Journal of Materials Chemistry C 4, no. 24 (2016): 5806–13. http://dx.doi.org/10.1039/c6tc00810k.

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15

Suhendri, Wahri Sunanda, and Rachmawan Budiarto. "Performance of Glazing Materials for Atrium in Hot & Humid Climate." MATEC Web of Conferences 186 (2018): 02007. http://dx.doi.org/10.1051/matecconf/201818602007.

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Анотація:

One comfort issue that considered to be the most important is thermal comfort. Air temperature is the most influential factor, and it is related to solar radiation and building's glazing. Besides thermal comfort, glazing is also needed to provide daylighting. Therefore, due to its relation to thermal comfort and daylighting, the glazing materials selection is crucial. Hence, by focusing on atrium in hot and humid climate, this study is aimed to examine a sufficient material with good thermal and daylighting performance. The results show that argon filled glazing is the most suitable material f

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16

Ghabuzyan, Levon, Kevin Pan, Arianna Fatahi, Jim Kuo, and Christopher Baldus-Jeursen. "Thermal Effects on Photovoltaic Array Performance: Experimentation, Modeling, and Simulation." Applied Sciences 11, no. 4 (2021): 1460. http://dx.doi.org/10.3390/app11041460.

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The performance of photovoltaic (PV) arrays are affected by the operating temperature, which is influenced by thermal losses to the ambient environment. The factors affecting thermal losses include wind speed, wind direction, and ambient temperature. The purpose of this work is to analyze how the aforementioned factors affect array efficiency, temperature, and heat transfer coefficient/thermal loss factor. Data on ambient and array temperatures, wind speed and direction, solar irradiance, and electrical output were collected from a PV array mounted on a CanmetENERGY facility in Varennes, Canad

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17

L. Syam Sundar. "Thermal Energy Storage Augmentation in Mini Heat Sink with Graphene Oxide/Nanodiamond Hybrid Nanofluids: Experimental and Machine Learning Approach." Journal of Environmental Nanotechnology 14, no. 2 (2025): 427–44. https://doi.org/10.13074/jent.2025.06.2511409.

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The heat transfer coefficient, friction factor, and thermal performance factor of graphene oxide/nanodiamond (GO/ND) hybrid nanofluids flowing in a mini-heat sink were measured experimentally and validated using the ensemble machine learning. The base fluid used in this study is 60:40% (weight percentage) of water and ethylene glycol mixture, and the experiments were conducted under different volume loadings (0 < < 2%), and different Reynolds numbers (1393.75 < Re < 5861.44), respectively. Eventually, the thermophysical properties were also estimated. Results indicated that, the th

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18

Kawashima, Eisuke, Mikiya Fujii, and Koichi Yamashita. "Thermal effect on the morphology and performance of organic photovoltaics." Physical Chemistry Chemical Physics 18, no. 38 (2016): 26456–65. http://dx.doi.org/10.1039/c6cp04019e.

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19

Al Nuwairan, Muneerah, and Basma Souayeh. "Augmentation of Heat Transfer in a Circular Channel with Inline and Staggered Baffles." Energies 14, no. 24 (2021): 8593. http://dx.doi.org/10.3390/en14248593.

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This numerical investigation presents the effects of the position of baffles in the shape of a circle’s segment placed inside a circular channel to improve the thermal and flow performance of a solar air heater. Three different baffles’ positions with Reynolds number varying between 10,000 to 50,000 were investigated computationally. The k-omega SST model was used for solving the governing equations. Air was taken as the working fluid. Three pitch ratios (Y = 3, 4, and 5) were considered, while the height of the baffles remained fixed. The result showed an enhancement in Nusselt number, fricti

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20

Absi, Rafik, Stéphane Marchandon, and Rachid Bennacer. "Thermal-electrical analogy and inertia for thermal performance of building envelops." MATEC Web of Conferences 330 (2020): 01037. http://dx.doi.org/10.1051/matecconf/202033001037.

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For transient thermal performance of building envelops adequate parameters are needed to capture the time lag and decrement factor. It is surprising that, in the formal electrical analogy, "inertia" is not represented by same components in fluid mechanics and heat transfer. In Windkessel model for fluid flow in elastic tubes, the fluid inertia is represented by an electrical inductance while in thermal-electric analogy, thermal inertia is given by a capacitance. Some authors argued that the terminology of ''thermal inertia'' is used incorrectly in the literature. The aim of our communication i

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21

KIM, NAE-HYUN, KANG-JONG LEE, JI-CHAO HAN, and BYUNG-NAM CHOI. "THERMAL PERFORMANCE OF SINE WAVE FIN-AND-OVAL TUBE HEAT EXCHANGERS." International Journal of Air-Conditioning and Refrigeration 21, no. 01 (2013): 1350008. http://dx.doi.org/10.1142/s2010132513500089.

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Experiments were conducted on sine wave fin-and-tube heat exchangers having oval tubes of 0.6 aspect ratio. Twelve samples having different fin pitches and tube rows were tested. Eight herringbone wave fin-and-tube heat exchangers having round tubes were also tested. For round tube samples, the effect of tube row on j factor is not prominent. For oval tube samples, however, the highest j factor is observed for two row configuration, whereas the lowest one is observed for one row configuration. Possible reasoning is provided considering the flow and heat transfer characteristics of sine wave ch

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22

Liu, Jian. "Electric Structure and Thermoelectric Performance in Cs2O Crystal." Frontiers in Science and Engineering 4, no. 10 (2024): 96–101. http://dx.doi.org/10.54691/v3dtt117.

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In this work, first principles DFT calculations has been employed with anharmonic phonon scatter theory and Boltzmann transport method to perform a exhaustive study on the thermoelectric properties as electronic and phonon transport of layered Cs2O crystal. The results indicate that Cs2O crystal represents a flat-and-dispersive type band structure, which returns a high power factor. In the other hand, low lattice thermal conductivity is discovered in Cs2O semiconductor, combined with its high power factor, the Cs2O crystal is considered a promising thermoelectric material. It is demonstrated t

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23

Cao, Xin, Huan-ling Liu, and Xiao-dong Shao. "Heat Transfer Performance of a Novel Multi-Baffle-Type Heat Sink." Entropy 20, no. 12 (2018): 979. http://dx.doi.org/10.3390/e20120979.

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A new type of multi-baffle-type heat sink is proposed in this paper. The heat-transfer coefficient and pressure drop penalty of the employed six heat sink models are numerically investigated under five different inlet velocities. It is shown that Model 6 (M6) has excellent heat transfer performance as its heat-transfer coefficient reaches a value of 1758.59 W/m2K with a pressure drop of 2.96 × 104 Pa, and the temperature difference between the maximum and the minimum temperature of the heating surface is 51.7 K. The results showed that the coolant for M6 is distributed evenly to each channel a

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24

Liu, Huaqiang, Xiangcheng Gao, Dong Niu, Minghao Yu, and Yulong Ji. "Thermal-Hydraulic Characteristics of the Liquid-Based Battery Thermal Management System with Intersected Serpentine Channels." Water 14, no. 19 (2022): 3148. http://dx.doi.org/10.3390/w14193148.

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Liquid thermal management is the prevailing method to maintain the operating performance and safety of Li-ion batteries. However, a better heat transfer performance is often accompanied by a higher power cost for liquid-based cooling methods. In the present work, V-shaped intersecting bypasses are integrated into conventional serpentine channels to reduce the liquid pressure drop across the cold plate without loss of thermal performance. The thermal-hydraulic characteristics of the battery thermal management system are studied based on CFD simulations. The non-dimensional j/f factor is develop

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25

Alavez-Ramirez, Rafael, Fernando Chiñas-Castillo, Jacobo Martínez-Reyes, et al. "Thermal Performance of Novel Eco-Friendly Prefabricated Walls for Thermal Comfort in Temperate Climates." Sustainability 16, no. 21 (2024): 9349. http://dx.doi.org/10.3390/su16219349.

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The global threat of climate change has become increasingly severe, with the efficiency of buildings and the environment being significantly impacted. It is necessary to develop bioclimatic architectural systems that can effectively reduce energy consumption while bringing thermal comfort, reducing the impact of external temperatures. This study presents the results of a real-scale experimental house prototype, MHTITCA, using a unique design composed of novel eco-friendly prefabricated channel walls filled with a blend of soil, sawdust, and cement for walls and roofs. The experimental analysis

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26

Li, Yunzhu, Yonghui Xie, and Di Zhang. "The Thermal Hydraulic Performance of Wavy PCHE with Different Materials and Geometric Parameters." MATEC Web of Conferences 207 (2018): 04008. http://dx.doi.org/10.1051/matecconf/201820704008.

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The printed circuited heat exchanger (PCHE) contain several different channel configurations, such as straight channel, zigzag channel and wavy channel. The wavy channel has better thermal performance than the straight channel and better hydraulic performance than the zigzag channel. This paper explores the thermal hydraulic performance of wavy channel PCHE. The numerical analysis of the PCHE in different materials and geometric parameters are conducted by computational fluid dynamics (CFD) tool. The materials applied in simulations involve Alloy617, Titanium Grade 3, Carlson 2205, UNS S30400

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27

Agrawal, Pawan, M. K. Gaur, and R. K. Pandit. "Experimental Investigation of Heat Transfer Coefficient in Parabolic Dish Solar Cooker with Thermal Energy Storage System." International Journal for Research in Applied Science and Engineering Technology 11, no. 8 (2023): 1424–31. http://dx.doi.org/10.22214/ijraset.2023.55371.

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Abstract: The use of solar cooking can help cut back on the consumption of fossil fuels. Due to the rising expense of fossil fuels, there is a great demand for an energy efficient and affordable solar cooking technology, and it is currently the most popular study topic worldwide. This study examines how a thermal energy storage material (Erythritol) can improve the thermal performance of solar parabolic dish cookers. On the cooking vessel with and without thermal energy storage material, tests for stagnation temperature and water boiling and cooling are performed. In terms of thermal performan

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28

Heracleous, C., R. Panagiotou, I. Ioannou, A. Michael, and M. Philokyprou. "Hygrothermal Performance of Adobe Structures." IOP Conference Series: Earth and Environmental Science 1196, no. 1 (2023): 012059. http://dx.doi.org/10.1088/1755-1315/1196/1/012059.

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Abstract Vernacular architecture incorporates many cooling and heating passive design strategies related to the structural envelope, the different architectural arrangements and the way of living of the inhabitants. Adobe walls are considered to be high thermal mass masonries, as they have the ability to store thermal energy. The high thermal inertia of these materials regulates indoor temperature variations through considerable time lags, thus contributing to the improvement of thermal comfort conditions. This study deals with the environmental behaviour of an adobe historic building in the r

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29

Sidharth, D., A. S. Alagar Nedunchezhian, R. Akilan, et al. "Enhanced thermoelectric performance of band structure engineered GeSe1−xTex alloys." Sustainable Energy & Fuels 5, no. 6 (2021): 1734–46. http://dx.doi.org/10.1039/d0se01788d.

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30

Dong, Yue, and Li Zhang. "A numerical study on the thermal hydraulic performance of finned elliptical tube with wet air flowing around." Journal of Physics: Conference Series 2584, no. 1 (2023): 012041. http://dx.doi.org/10.1088/1742-6596/2584/1/012041.

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Abstract Energy conservation is a key concern for countries around the world. Enhanced heat exchange is one of the important ways to save energy. The heat transfer process of wet gas is a special heat transfer process, accompanied by a mass transfer phenomenon. Improving the thermal hydraulic performance of wet gas can greatly improve the energy utilization rate. The thermal hydraulic characteristic of finned elliptical tubes with different elliptical axis ratios (0.9 to 0.5) was numerically studied under wet air conditions. Chilton & Colburn factor was chosen as assessment parameters for

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31

Gordon, J. M., and Y. Zarmi. "Thermal Performance in Multi-Pass Solar Systems With Well-Mixed Storage." Journal of Solar Energy Engineering 109, no. 2 (1987): 94–100. http://dx.doi.org/10.1115/1.3268199.

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An approximate analysis of multi-pass, closed-loop solar systems with well-mixed storage tanks is presented. The thermal coupling of the storage tank both to the collector-storage loop (“charging” cycle) and the load-storage loop (“discharging” cycle) is shown to reduce system performance by a penalty factor, called the partial depletion factor, when compared to one-pass, open-loop systems in which the storage fluid is completely consumed by the load by the end of each 24-hour day (total depletion). This penalty factor is typically around 20 percent for systems with a daytime-only load and 30

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32

Qian, Zuoqin, Qiang Wang, and Song Lv. "Research on the Thermal Hydraulic Performance and Entropy Generation Characteristics of Finned Tube Heat Exchanger with Streamline Tube." Energies 13, no. 20 (2020): 5408. http://dx.doi.org/10.3390/en13205408.

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Thermal hydraulic performance of the fin-and-tube heat exchanger is presented in this paper. The purpose of this investigation was to investigate the heat transfer mechanism and flow characteristics in the finned tube heat exchanger with streamline tube. The streamline tube in this paper had the streamline cross section which was composed of a semicircle and a half diamond. Three-dimensional numerical simulation was presented and validated by the experiment and the other numerical simulation from public articles. The present simulation had good agreement with the experimental results. The diff

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33

Pan, Yi. "Enhanced Thermoelectric Performance in Ca-doped AgSbTe2." Academic Journal of Science and Technology 10, no. 1 (2024): 415–19. http://dx.doi.org/10.54097/35sqr584.

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Thermoelectric materials play a crucial role in applications such as recovering waste heat and refrigeration. We report a thermoelectric figure of merit (zT) of 1.17 at 623 K for AgSb1-xCaxTe2, representing a 31% enhancement compared to pristine AgSbTe2. The improved thermoelectric performance arises from enhancements in both the power factor and lattice thermal conductivity. Dopant substitution of element Ca at the Sb site in AgSbTe2 suppresses the formation of Ag2Te and increases the concentration of p-type charge carriers, leading to enhanced electrical transport properties. Additionally, C

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34

Ameur, Houari, Djamel Sahel, and Younes Menni. "Numerical investigation of the performance of perforated baffles in a plate-fin heat exchanger." Thermal Science, no. 00 (2020): 90. http://dx.doi.org/10.2298/tsci190316090a.

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The present paper is a numerical investigation on the performance of perforated baffles in a plate-fin heat exchanger. Two types of perforations are studied, namely the circular and elliptical shapes. Values of heat transfer coefficient, pressure drop and thermal performance factor are determined for both cases and compared with those for a smooth channel. Also, the flow fields and heat transfer characteristics are determined for different fluids and various Reynolds numbers. The working fluids are complex, non-Newtonian and have an inelastic shear thinning behavior. The obtained results showe

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35

Zhang, Lin, Daniele Cocco, Nicholas Kelez, Daniel S. Morton, Venkat Srinivasan, and Peter M. Stefan. "Optimizing X-ray mirror thermal performance using matched profile cooling." Journal of Synchrotron Radiation 22, no. 5 (2015): 1170–81. http://dx.doi.org/10.1107/s1600577515013090.

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To cover a large photon energy range, the length of an X-ray mirror is often longer than the beam footprint length for much of the applicable energy range. To limit thermal deformation of such a water-cooled X-ray mirror, a technique using side cooling with a cooled length shorter than the beam footprint length is proposed. This cooling length can be optimized by using finite-element analysis. For the Kirkpatrick–Baez (KB) mirrors at LCLS-II, the thermal deformation can be reduced by a factor of up to 30, compared with full-length cooling. Furthermore, a second, alternative technique, based on

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Chang, Hui-Ching, Hao-Jen You, Raman Sankar, Ying-Jay Yang, Li-Chyong Chen, and Kuei-Hsien Chen. "Enhanced Thermoelectric Performance via Oxygen Manipulation in BiCuTeO." MRS Advances 4, no. 08 (2019): 499–505. http://dx.doi.org/10.1557/adv.2019.115.

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AbstractBiCuTeO is a potential thermoelectric material owing to its low thermal conductivity and high carrier concentration. However, the thermoelectric performance of BiCuTeO is still below average and has much scope for improvement. In this study, we manipulated the nominal oxygen content in BiCuTeO and synthesized BiCuTeOx (x = 0.94–1.06) bulks by a solid-state reaction and pelletized them by a cold-press method. The power factor was enhanced by varying the nominal oxygen deficiency due to the increased Seebeck coefficient. The thermal conductivity was also reduced due to the decrease in la

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Zheng, Yanhong, Pengfei Si, Yin Zhang, et al. "Study on the Effect of Radiant Insulation Panel in Cavity on the Thermal Performance of Broken-Bridge Aluminum Window Frame." Buildings 13, no. 1 (2022): 58. http://dx.doi.org/10.3390/buildings13010058.

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Анотація:

Windows have a great impact on building energy consumption, and the thermal performance of window frames directly affects its energy-saving potential. In this paper, a novel method is proposed to optimize the thermal performance of commercially available broken-bridge aluminum window frames, by incorporating radiant insulation panels (RIPs) into the window frame cavity. A typical aluminum alloy window frame heat transfer model is theoretically analyzed and validated, and the effects of key design parameters on the equivalent thermal conductivity (ETC) of the cavity radiation heat transfer and

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Romero, Pilar, Víctor Valero-Amaro, Sergio Rubio, and María Teresa Miranda. "An Analysis of Thermal Comfort as an Influencing Factor on the Academic Performance of University Students." Education Sciences 14, no. 12 (2024): 1340. https://doi.org/10.3390/educsci14121340.

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Анотація:

Academic performance is the level of achievement that students reach in their educational activities. It is influenced by several factors that should be analysed and prioritised, especially in engineering courses, characterised by their difficulty and low success rates compared to other careers. This paper analyses the impact of these factors on academic performance during exams in a technical college in southwestern Spain, with a particular focus on environmental conditions, identified as a relevant and independent variable. The results show a significant connection between thermal comfort an

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Sanjay, Ratan, Rishabh Baluni, and Rohit Kumar. "Thermal Hydraulic Performance of Solar Air Heater with Roughness: A Numerical Analysis." Asian Journal of Applied Science and Technology 09, no. 01 (2025): 01–10. https://doi.org/10.38177/ajast.2025.9101.

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Анотація:

Solar air heaters are indispensable in several industries, encompassing industrial environments, agricultural product dehydration, material conditioning, and residential heating. Nevertheless, inadequate convective transfer can hinder their effectiveness. The enhancements in thermal hydraulic performance and friction factor characteristics have significantly increased the efficiency of solar energy utilization. Additional research and development efforts have the potential to enhance the utilization of clean and sustainable energy sources. This paper achieved a heat transfer rate that was more

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Yang, Manman, Mengxiang Yang, Yimin Li, et al. "Optimizing Thermoelectric Performance of Tellurium via Doping with Antimony and Selenium." Molecules 28, no. 21 (2023): 7287. http://dx.doi.org/10.3390/molecules28217287.

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Forming solid solutions is one of the most effective strategies to suppress the thermal conductivity of thermoelectric materials. However, the accompanying increase in impurity ion scattering usually results in an undesirable loss in hall mobility, negatively impacting the electrical transport properties. In this work, a tellurium–selenium (Te-Se) solid solution with trace antimony (Sb) doping was synthesized via the high pressure and high temperature method. It was found that slight Se doping into the Te sites not only had no impact on the hall mobility and carrier concentration, but also enh

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Sumit, Kumar*1 and Dr. Manikant Paswan2. "COMPUTATIONAL INVESTIGATION OF THERMAL PERFORMANCE OF SOLAR AIR HEATER HAVING ROUGHNESS ELEMENTS AS TRANSVERSE WIRE ON THE TWO SIDE ABSORBER PLATE." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 7, no. 2 (2018): 664–74. https://doi.org/10.5281/zenodo.1184046.

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An Analytical investigation has been carried out to study the heat transfer and friction characteristics by using a transverse wire on the absorber plate of a solar air heater. The Analytical investigation consist the Reynolds number (Re) ranges from 3000 to 14 000, relative roughness pitch (p/e) 10–30 and relative roughness height (e/D) 0.0135-0.0225. The effect of these parameters on the heat transfer coefficient and friction factor has been discussed in the present paper and correlations for Nusselt number and friction factor has been developed within above limits. A procedure to comp

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Kuang, He Wei, Zhi Yong Ai, and Zi Kun Ye. "Multi-dimensional prediction and factor analysis of thermal performance for energy piles." Renewable Energy 240 (February 2025): 122270. https://doi.org/10.1016/j.renene.2024.122270.

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Zheng, Yang, Bao Lan Xiao, Wei Ming Wu, Xiao Li Yu, and Guo Dong Lu. "Numerical Simulation Study on Thermal-Hydraulic Performances of Vehicular Radiator Heat Transfer Units." Advanced Materials Research 538-541 (June 2012): 2061–66. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.2061.

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A radiator is one of the most important components in vehicular cooling system whose excellent fluid flow and heat transfer characteristics guarantees the engine operations. The calculation workload for performance simulation of a whole radiator is too huge due to its size. Experimental study is the conventional method to study radiator performance. This paper put forward a numerical simulation method and radiator heat transfer units were taken as study objects. Orthogonal experiment method was adopted to arrange multi-factor and multi-level calculation schemes. 23 samples with different fin p

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Hung, Yi-Hsuan, Jyun-Hong Chen, and Tun-Ping Teng. "Feasibility Assessment of Thermal Management System for Green Power Sources Using Nanofluid." Journal of Nanomaterials 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/321261.

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A thermal management system using alumina (Al2O3)/water as the nanofluid for green power sources was experimentally assessed in this paper. Basic thermal principles and formulas were utilized to evaluate the performance of an air-cooled heat exchanger. The Al2O3/water nanofluid was produced at the concentrations of 0.5, 1.0, and 1.5 wt.%. The testing conditions of this experiments were above three concentrations, five coolant flow rates (0.8, 1.2, 1.6, 2.0, and 2.4 L/min.), and three heating powers (50, 100, and 150 W). Firstly, basic properties of nanoparticles were analyzed. Fundamental rela

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Zhuang, Zhi, Jing Xue, and Hai Ye. "Study on Thermal Performance of a New Solar Air Heating Collector." Advanced Materials Research 706-708 (June 2013): 1814–17. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1814.

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The thermal performance of a new Solar air Collector with Colored Fins (SCCF) used for heating was studied. A macroscopic model was proposed based on the law of mass and energy conservation. The effects of the parameters such as dimensions of SCCF, fin angle and material of the fins on the outlet air temperature, airflow rate, effective energy and thermal efficiency were discussed. The results indicate that thermal performance of SCCF can be obviously improved by the increases of aspect ratio, fin angle and vent size. The air flow rate is the dominated factor affecting effective energy and the

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Zhou, Shiyu, Jiaqi Cao, Zhili Zhang, Haibo Wang, and Jiying Liu. "Thermal properties of radiant floor surface materials and numerical evaluation of the thermal performance." BioResources 18, no. 2 (2023): 3909–22. http://dx.doi.org/10.15376/biores.18.2.3909-3922.

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A Hot Disk thermal constant analyzer was used to obtain the thermal parameters of composite boards, solid wood floor, and ceramic tiles (CT). FLUENT software was used for the model establishment and the temperature field simulation, and the effects caused by different surface materials were analyzed. A 2D unsteady model was constructed to analyze floor surface temperature and indoor temperature fields in an enclosure space. Comparison of temperature fields caused by different materials showed that both steady indoor temperature and surface temperature of CT were the highest, which is due to it

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Li, Ping, Xing Yong Gu, Ting Luo, and Yun Xia Chen. "Effect of Different Sintering Temperature on the Performance of Mullite-Corundum Refractory Materials." Advanced Materials Research 750-752 (August 2013): 521–24. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.521.

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Анотація:

Al (OH)3, Suzhou kaolin, AlF3 and V2O5 were premixed and pelleted to form the precursor for fabricating the mullite whisker, and then the precursor was added into the calcined bauxite and Suzhou kaolin mixture according to a certain mass percent. The mullite-corundum refractory materials with well-dispersed needle-like mullite formed in-situ were prepared. Through studying the effect of different sintering temperatures on the performances of the as-fabricated mullite-corundum refractory materials, it was concluded that the appropriate sintering temperature was 1450 °C. X-ray diffraction (XRD),

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A.S., Deshpande, Bhosale S.Y., and H.N.Deshpande. "Numerical and Experimental Determination of Thermal Performance of Perforated Variable Pitch Twisted Tape Insert." Journal of Thermal Energy Systems 4, no. 2 (2019): 23–42. https://doi.org/10.5281/zenodo.3366410.

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Анотація:

In recent years, studies are being done to enhance heat transfer techniques to reduce the thermal resistance either by increasing the effective heat transfer surface area or by generating turbulence. To achieve this, in tube in tube heat exchangers, variety of tube inserts such as twisted tape, wire coil, swirl flow generator etc. are used. The effectiveness of a heat transfer enhancement technique is evaluated by the Thermal Performance Factor which is a ratio of the change in the heat transfer rate to change in friction factor. In this research work, different types twisted tape tube inserts

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Petinrin, M. O., O. A. Towoju, S. A. Ajiboye, and O. E. Zebulun. "Numerical Study of the Effect of Changing Tube Pitches on Heat and Flow Characteristics from Tube Bundles in Cross Flow." Journal of Engineering Sciences 6, no. 2 (2019): e1-e10. http://dx.doi.org/10.21272/jes.2019.6(2).e1/.

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Tube bundles are found in various heat transfer equipment for thermal energy transfer between fluids. However, the inter-spatial arrangement of the tubes of any tube bundle is a determining factor for its thermal and hydraulic performance. In this paper, the effect of varying the transverse and longitudinal pitches downstream staggered circular tube bundle on the heat transfer and flow characteristic was numerically analyzed. Seven variations of tube arrangements were studied by changing the tube pitches within a Reynolds number range of 7 381 to 22 214. The analyses were carried out using the

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Venkatesh, R., Nitesh Kumar, N. Madhwesh, and Manjunath M.S. "CFD analysis for thermal performance augmentation of solar air heater using deflector ribs." Journal of Mechanical Engineering and Sciences 14, no. 3 (2020): 7282–95. http://dx.doi.org/10.15282/jmes.14.3.2020.27.0572.

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This paper presents the effect of deflector ribs on the thermal performance of flat plate solar air heater using Computational Fluid Dynamics (CFD) methodology. The analysis is carried out using two-dimensional computational domain for the Reynolds number range of 6000-18000. RNG k-є turbulence model is used to capture the turbulence characteristics of the flow. The deflector rib has a cross-section of isosceles triangle and is placed transversely with respect to the flow. The distance between consecutive ribs is varied as 40mm, 80mm, 160mm and 320mm while the air gap height is varied as 2mm,

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