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Journal articles on the topic 'THERMODYNAMICS PERFORMANCE'

Author: Grafiati

Published: 11 September 2023

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1

Mitrovic, Dejan, Marko Ignjatovic, Branislav Stojanovic, Jelena Janevski, and Mirko Stojiljkovic. "Comparative exergetic performance analysis for certain thermal power plants in Serbia." Thermal Science 20, suppl. 5 (2016): 1259–69. http://dx.doi.org/10.2298/tsci16s5259m.

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Traditional methods of analysis and calculation of complex thermal systems are based on the first law of thermodynamics. These methods use energy balance for a system. In general, energy balances do not provide any information about internal losses. In contrast, the second law of thermodynamics introduces the concept of exergy, which is useful in the analysis of thermal systems. Exergy is a measure for assessing the quality of energy, and allows one to determine the location, cause, and real size of losses incurred as well as residues in a thermal process. The purpose of this study is to compa

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2

Ng, K. C., T. Y. Bong, and H. T. Chua. "Performance Evaluation of Centrifugal Chillers in an Air-Conditioning Plant with The Building Automation System (BAS)." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 208, no. 4 (1994): 249–55. http://dx.doi.org/10.1243/pime_proc_1994_208_045_02.

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A thermodynamic model with a novel method of describing the performances of centrifugal chillers for air-conditioning is presented. It is based on the first and second laws of thermodynamics which captures the overall entropy change due to non-isentropic compression and expansion of the thermodynamic cycle. The model gives the fundamental relation between the coefficient of performance (COP) and the cooling rates (Qe) for (a) the modulating and (b) the throttling actions of the inlet guide-vanes of the compressor. The usefulness and the accuracy of the model are demonstrated here by analysing

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3

Bejan, Adrian, and George Tsatsaronis. "Purpose in Thermodynamics." Energies 14, no. 2 (2021): 408. http://dx.doi.org/10.3390/en14020408.

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This is a review of the concepts of purpose, direction, and objective in the discipline of thermodynamics, which is a pillar of physics, natural sciences, life science, and engineering science. Reviewed is the relentless evolution of this discipline toward accounting for evolutionary design with direction, and for establishing the concept of purpose in methodologies of modeling, analysis, teaching, and design optimization. Evolution is change after change toward flow access, with direction in time, and purpose. Evolution does not have an ‘end’. In thermodynamics, purpose is already the definin

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He, Rong, Xinli Wei, and Nasruddin Hassan. "Multi-objective performance optimization of ORC cycle based on improved ant colony algorithm." Open Physics 17, no. 1 (2019): 48–59. http://dx.doi.org/10.1515/phys-2019-0006.

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Abstract To solve the problem of multi-objective performance optimization based on ant colony algorithm, a multi-objective performance optimization method of ORC cycle based on an improved ant colony algorithm is proposed. Through the analysis of the ORC cycle system, the thermodynamic model of the ORC system is constructed. Based on the first law of thermodynamics and the second law of thermodynamics, the ORC system evaluation model is established in a MATLAB environment. The sensitivity analysis of the system is carried out by using the system performance evaluation index, and the optimal wo

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5

HE, JI-ZHOU, XIAN HE, and JIE ZHENG. "THERMAL ENTANGLED QUANTUM REFRIGERATOR WORKING WITH THE TWO-QUBIT HEISENBERG XX MODEL." International Journal of Modern Physics B 26, no. 11 (2012): 1250086. http://dx.doi.org/10.1142/s0217979212500865.

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An entangled quantum refrigerator working with a two-qubit Heisenberg XX model in a constant external magnetic field is constructed in this paper. Based on the quantum first law of thermodynamics, the expressions for several basic thermodynamic quantities such as the heat transferred, the net work and the coefficient of performance are derived. Moreover, the influence of the thermal entanglement on the basic thermodynamic quantities is investigated. Several interesting features of the variation of the basic thermodynamic quantities with the thermal entanglement in zero and nonzero magnetic fie

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Vischi, Francesco, Matteo Carrega, Alessandro Braggio, Pauli Virtanen, and Francesco Giazotto. "Thermodynamics of a Phase-Driven Proximity Josephson Junction." Entropy 21, no. 10 (2019): 1005. http://dx.doi.org/10.3390/e21101005.

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We study the thermodynamic properties of a superconductor/normal metal/superconductor Josephson junction in the short limit. Owing to the proximity effect, such a junction constitutes a thermodynamic system where phase difference, supercurrent, temperature and entropy are thermodynamical variables connected by equations of state. These allow conceiving quasi-static processes that we characterize in terms of heat and work exchanged. Finally, we combine such processes to construct a Josephson-based Otto and Stirling cycles. We study the related performance in both engine and refrigerator operati

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Alghamdi, Mohammed, Ibrahim Al-Kharsan, Sana Shahab, et al. "Investigation of Energy and Exergy of Geothermal Organic Rankine Cycle." Energies 16, no. 5 (2023): 2222. http://dx.doi.org/10.3390/en16052222.

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In this study, modeling and thermodynamic analysis of the combined double flash geothermal cycle generation was conducted using zeotropic fluid as the working fluid in the Organic Rankine Cycle (ORC). The analysis was performed based on the first and second laws of thermodynamics. Hexane, cyclohexane, isohexane, R245fa, and R236ea exhibit good performance at higher temperatures. In this study, three fluids—hexane, cyclohexane, and isohexane—were used. First, the model results for the pure fluids were compared with those of previous studies. Then, the important parameters of the cycle, includin

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Chen, Pengfan, Ying Wang, Wenhao Ding, Yafeng Niu, Zibo Lin, and Yingwen Liu. "Performance analysis of free piston Stirling engine based on the phasor notation method." E3S Web of Conferences 313 (2021): 02004. http://dx.doi.org/10.1051/e3sconf/202131302004.

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The free piston Stirling engine (FPSE) is a couple system of dynamics and thermodynamics. Due to the complicated and interactive relationships between the dynamic parameters and thermodynamic parameters, the performance of the FPSE is always difficult to predict and evaluate. The phasor notation method is proposed based on a thermodynamic-dynamic coupled model of a beta-type FPSE in this paper. The output power and efficiency under the different heating temperature and charging pressure are analysed and compared. In addition, based on the Sage numerical model, the influences of heating tempera

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9

Fu, Jiawei, Zhenhua Liu, Xingyang Yang, Sumin Jin, and Jilei Ye. "Limiting Performance of the Ejector Refrigeration Cycle with Pure Working Fluids." Entropy 25, no. 2 (2023): 223. http://dx.doi.org/10.3390/e25020223.

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An ejector refrigeration system is a promising heat-driven refrigeration technology for energy consumption. The ideal cycle of an ejector refrigeration cycle (ERC) is a compound cycle with an inverse Carnot cycle driven by a Carnot cycle. The coefficient of performance (COP) of this ideal cycle represents the theoretical upper bound of ERC, and it does not contain any information about the properties of working fluids, which is a key cause of the large energy efficiency gap between the actual cycle and the ideal cycle. In this paper, the limiting COP and thermodynamics perfection of subcritica

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10

Asnaghi, A., S. M. Ladjevardi, P. Saleh Izadkhast, and A. H. Kashani. "Thermodynamics Performance Analysis of Solar Stirling Engines." ISRN Renewable Energy 2012 (July 5, 2012): 1–14. http://dx.doi.org/10.5402/2012/321923.

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This paper provides numerical simulation and thermodynamic analysis of SOLO 161 Solar Stirling engine. Some imperfect working conditions, pistons' dead volumes, and work losses are considered in the simulation process. Considering an imperfect regeneration, an isothermal model is developed to calculate heat transfer. Hot and cold pistons dead volumes are accounted in the work diagram calculations. Regenerator effectiveness, heater and cooler temperatures, working gas, phase difference, average engine pressure, and dead volumes are considered as effective parameters. By variations in the effect

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11

Zheng, Guozhong, and Youyin Jing. "Thermodynamics Performance Study on Water Source Heat Pump in Variant Operating Condition." Energy & Environment 20, no. 4 (2009): 517–32. http://dx.doi.org/10.1260/095830509788707284.

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Water source heat pumps have outstanding advantages: significant energy conservation, working stability and notable pollution reduction. In this paper, the benefits and features of the water source heat pump are described. Then the methodology for studying the thermodynamics performance in variant conditions is described and the thermodynamics analysis of a specific water source heat pump is presented based on the first law of thermodynamics and exergy analysis theory to study the thermodynamics performance in variant condition. Coefficient of Performance (COP) and exergy efficiency in variant

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12

Chimal-Eguia, J., R. Paez-Hernandez, Delfino Ladino-Luna, and Juan Velázquez-Arcos. "Performance of a simple energetic-converting reaction model using Linear Irreversible Thermodynamics." Entropy 21, no. 11 (2019): 1030. http://dx.doi.org/10.3390/e21111030.

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In this paper, the methodology of the so-called Linear Irreversible Thermodynamics (LIT) is applied to analyze the properties of an energetic-converting biological process using simple model for an enzymatic reaction that couples one exothermic and one endothermic reaction in the same fashion as Diaz-Hernandez et al. (Physica A, 2010, 389, 3476–3483). We extend the former analysis to consider three different operating regimes; namely, Maximum Power Output (MPO), Maximum Ecological Function (MEF) and Maximum Efficient Power Function (MEPF), respectively. Based on the later, it is possible to ge

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13

Yang, Li Yan, Yi Hui Guo, and Li Li Yu. "Preparation and Thermodynamics Adsorption Performance of Cobalt Ions on the Crosslinked Starch Microspheres." Advanced Materials Research 726-731 (August 2013): 435–39. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.435.

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A type of cross-linking starch microspheres (CSMs) has been synthesized by reversed phase suspension method using soluble starch as raw material. Crosslinked starch microsphere has good adsorption performance to metal ions in water. The static adsorption behaviors of Co2+on the cross-linked starch microspheresand were investigated. The CSMs and its adsorption product were comparatively characterized by Fourier Transform Infrared Spectroscopy (FTIR). The adsorption behaviour of CSMs in different temperatures is in agreement with the Freundlich isothermal equation and isothermal equation of Lang

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14

Zou, Chen-Juan, Yue Li, Jia-Kun Xu, Jia-Bin You, Ching Eng Png, and Wan-Li Yang. "Geometrical Bounds on Irreversibility in Squeezed Thermal Bath." Entropy 25, no. 1 (2023): 128. http://dx.doi.org/10.3390/e25010128.

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Irreversible entropy production (IEP) plays an important role in quantum thermodynamic processes. Here, we investigate the geometrical bounds of IEP in nonequilibrium thermodynamics by exemplifying a system coupled to a squeezed thermal bath subject to dissipation and dephasing, respectively. We find that the geometrical bounds of the IEP always shift in a contrary way under dissipation and dephasing, where the lower and upper bounds turning to be tighter occur in the situation of dephasing and dissipation, respectively. However, either under dissipation or under dephasing, we may reduce both

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15

Liu, Shuai, Fangjun Liu, Zhanhao Yan, et al. "Nucleation of L12-Al3M (M = Sc, Er, Y, Zr) Nanophases in Aluminum Alloys: A First-Principles ThermodynamicsStudy." Crystals 13, no. 8 (2023): 1228. http://dx.doi.org/10.3390/cryst13081228.

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High-performance Sc-containing aluminum alloys are limited in their industrial application due to the high cost of Sc elements. Er, Zr, and Y elements are candidates for replacing Sc elements. Combined with the first-principles thermodynamic calculation and the classical nucleation theory, the nucleation of L12-Al3M (M = Sc, Er, Y, Zr) nanophases in dilutealuminum alloys were investigated to reveal their structural stability. The calculated results showed that the critical radius and nucleation energy of the L12-Al3M phases were as follows: Al3Er > Al3Y > Al3Sc > Al3Zr. The Al3Zr phas

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16

Patil, Sharad D., and Kanhaiya P. Powar. "Adoption of Experiential Learning Approach for Validation of Perpetual Motion Machine of First Kind Concept in Engineering Thermodynamics." Journal of Engineering Education Transformations 36, S2 (2023): 385–90. http://dx.doi.org/10.16920/jeet/2023/v36is2/23058.

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Educationalists among the globe are innovating and experimenting innovative teaching practices to the students to trigger students involvement, grasp of the concepts and performance. Engaging students in practical and challenging activities is one of the way to engage students in the learning process. The learning through inference drawn from these activities and experience is referred as an experiential learning. Experiential learning has evolved as a superior teaching-learning methodology over conventional classroom teaching. Autonomy in learning to the students and triggering creative think

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17

Bejan, Adrian. "Thermodynamics of heating." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475, no. 2223 (2019): 20180820. http://dx.doi.org/10.1098/rspa.2018.0820.

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Heat transfer is a mature science, and so is thermodynamics. They are almost 200 years old having developed largely independently until the 1980s. Maturity comes from the usefulness and success of the thermal sciences. This review uses the thermodynamics of heat transfer to focus on aspects that are usually not discussed in physics: performance, purpose, function, objective and direction of evolutionary design. The article illustrates the unity of the thermal sciences discipline (heat transfer +thermodynamics + constructal law), and uses the opportunity to correct a few recent interpretations

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18

Dong, Hai Hong, Lin Ruan, Shu Qin Guo, Rui Cao, and Jin Xiu Chen. "Study of the Thermodynamic Processes and Performance Evaluation of Self-Circulation Evaporative Cooling System in Hydro-Generator." Applied Mechanics and Materials 488-489 (January 2014): 979–82. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.979.

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The self-circulation evaporative cooling system (SECS) of stator collector ring is a kind of new cooling technology, utilizing the evaporating of work fluid to cool the stator collector ring of hydro-generator. In this article, the thermodynamic processes of SECS of stator collector ring were analyzed by the second law of thermodynamics. The entropy production and power loss of isolated SECS were analyzed. Based on the distinctive characteristics of SECS, a performance evaluation function was proposed. The influence of heat load on was discussed by simulating. The conclusions provide the theor

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19

Li, Jian Qiang, Dan Dan Chen, He Wang, and Xiao Fei Fu. "The Analysis Research of Thermal System of Coal-Fired Power Plant and Examples of Applications." Advanced Materials Research 614-615 (December 2012): 157–61. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.157.

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What the paper describes is to develop the performance calculation program and it will be used in the practical unit through analyzing the thermal process in the power plant, which is on the basis of the operation performance of the power plant equipment and the analysis of the calculation method in accordance with the first law of thermodynamics. We can be analyzed through calculating and quantifying the performance of the whole boiler, the turbine, the thermodynamic system and the power plant in detail. The operation quality and the intact degree of unit equipment can be evaluated by the ope

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20

Chubb, Christopher T., Marco Tomamichel, and Kamil Korzekwa. "Beyond the thermodynamic limit: finite-size corrections to state interconversion rates." Quantum 2 (November 27, 2018): 108. http://dx.doi.org/10.22331/q-2018-11-27-108.

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Thermodynamics is traditionally constrained to the study of macroscopic systems whose energy fluctuations are negligible compared to their average energy. Here, we push beyond this thermodynamic limit by developing a mathematical framework to rigorously address the problem of thermodynamic transformations of finite-size systems. More formally, we analyse state interconversion under thermal operations and between arbitrary energy-incoherent states. We find precise relations between the optimal rate at which interconversion can take place and the desired infidelity of the final state when the sy

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21

Guo, Xinjia, Bing Xu, Zheshu Ma, Yanju Li, and Dongxu Li. "Performance Analysis Based on Sustainability Exergy Indicators of High-Temperature Proton Exchange Membrane Fuel Cell." International Journal of Molecular Sciences 23, no. 17 (2022): 10111. http://dx.doi.org/10.3390/ijms231710111.

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Based on finite-time thermodynamics, an irreversible high-temperature proton exchange membrane fuel cell (HT-PEMFC) model is developed, and the mathematical expressions of exergy efficiency, exergy destruction index (EDI), and exergy sustainability indicators (ESI) of HT-PEMFC are derived. According to HT-PEMFC model, the influences of thermodynamic irreversibility on exergy sustainability of HT-PEMFC are researched under different operating parameters that include operating temperatures, inlet pressure, and current density. The results show that the higher operating temperature and inlet pres

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Wang, Lei, Chonghong Zhan, Jianli Zhang, and Xudong Zhao. "The energy and exergy analysis of counter-flow regenerative evaporative cooler." Thermal Science 23, no. 6 Part A (2019): 3615–26. http://dx.doi.org/10.2298/tsci180602304w.

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Recently the regenerative evaporative cooler (REC) has drawn great attention from researchers because it can cool the intake air below the wet-bulb temperature and approaching its dew point temperature. For further understanding of the heat and mass transfer occurred in a counter-flow REC, a novel mathematical model is developed based on the law of energy conservation and the principle of the thermodynamic theory. The proposed mathematical model is validated against experimental data from literature. The parametric study is performed to investigate the performance of the REC under different op

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23

Khamooshi, Mehrdad, Kiyan Parham, Mortaza Yari, Fuat Egelioglu, Hana Salati, and Saeed Babadi. "Thermodynamic Analysis and Optimization of a High Temperature Triple Absorption Heat Transformer." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/980452.

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First law of thermodynamics has been used to analyze and optimize inclusively the performance of a triple absorption heat transformer operating with LiBr/H2O as the working pair. A thermodynamic model was developed in EES (engineering equation solver) to estimate the performance of the system in terms of the most essential parameters. The assumed parameters are the temperature of the main components, weak and strong solutions, economizers’ efficiencies, and bypass ratios. The whole cycle is optimized by EES software from the viewpoint of maximizing the COP via applying the direct search method

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Huang, Dongsheng, Yin Zhang, and Yanhong Zheng. "Evaluation of thermal performance of air source heat pump heating system based on electricity equivalent." Thermal Science, no. 00 (2022): 6. http://dx.doi.org/10.2298/tsci210712006h.

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Thermal performance assessment and optimization for energy conversion and utilization systems are of high significance in building energy efficiency. Generally speaking, the evaluation of actual thermodynamic system performance is mainly based on the first law of thermodynamics, with emphasis on the quantity of energy consumption, while ignoring the energy quality. Thus, it results in a one-sided evaluation in the analysis of system energy saving. In this paper, the electricity equivalent is used to analyze and evaluate the air source heat pump (ASHP) heating system under the different working

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25

Mullisen, R. S. "Boil–Freeze–Pop Thermodynamics." International Journal of Mechanical Engineering Education 30, no. 2 (2002): 119–22. http://dx.doi.org/10.7227/ijmee.30.2.3.

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A NASA astronaut's observation of a pan of water placed in a vacuum chamber used for simulated space conditions provided information for this analysis. As the vacuum chamber was depressurized the water was observed to boil violently, then flash freeze, and then ice popped out of the pan. A thermodynamic analysis of the observed behaviour includes phase change cooling, an explanation of the boil—freeze—pop performance and a process path plot on the pressure—volume—temperature diagram that passes through the triple point of water.

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26

Ujile, Awajiogak Anthony, and Dirina Amesi. "Performance Evaluation of Refrigeration Units in Natural Gas Liquid Extraction Plant." Journal of Thermodynamics 2014 (March 25, 2014): 1–7. http://dx.doi.org/10.1155/2014/863408.

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This paper has applied thermodynamics principles to evaluate the reliability of 390 m3/hr natural gas processing plant. The thermodynamics equations were utilized in the evaluation, characterization, and numerical simulation of key process parameters in natural gas liquid extraction plant. The results obtained show the comparison of the coefficient of performance, compression ratio, isentropic work, actual work, electrical power requirements, cooling water consumption in intercoolers, compressor power output, compressor capacity, and isentropic, volumetric, and mechanical efficiency of the two

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Bruno, Nickolaus M., and Matthew R. Phillips. "An Analytical Approach for Computing the Coefficient of Refrigeration Performance in Giant Inverse Magnetocaloric Materials." Magnetism 2, no. 1 (2022): 10–30. http://dx.doi.org/10.3390/magnetism2010002.

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An analytical approach for computing the coefficient of refrigeration performance (CRP) was described for materials that exhibited a giant inverse magnetocaloric effect (MCE), and their governing thermodynamics were reviewed. The approach defines the magnetic work input using thermodynamic relationships rather than isothermal magnetization data discretized from the literature. The CRP was computed for only cyclically reversible temperature and entropy changes in materials that exhibited thermal hysteresis by placing a limit on their operating temperature in a thermodynamic cycle. The analytica

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Nguyen, Trung Hieu, Phuong Nguyen-Tri, Xavier Vancassel, and Francois Garnier. "Aero-thermodynamic and chemical process interactions in an axial high-pressure turbine of aircraft engines." International Journal of Engine Research 20, no. 6 (2018): 653–69. http://dx.doi.org/10.1177/1468087418772228.

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Precise investigation of aero-thermodynamic and chemical processes relating to environmental precursor pollutants in an aircraft turbine is challenging because of the complexity of transformation processes at high temperature and high pressure. We present here, for the first time, new insights into the study of aero-thermodynamic processes, formation of nitrate and sulfate aerosol precursors, and investigate the influence of chemical processes on aero-thermodynamics. We also shed light on the effect of three-dimensional blade profile, radial spacing, and rotor speed on the performance of a hig

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Wan Mohd Zawawi, Wan Akmal Izzati, Khairiyah Mohd Yusof, Nur Fazirah Jumari, Nor Azlinda Azmi, and Tengku Nur Zulaikha Tengku Malim Busu. "Implication of Active Learning Techniques in Learning Thermodynamics Energy Conversion using BLOSSOMS Thermodynamics Energy Conversion Video towards Engineering Undergraduates Performance." International Journal of Emerging Technologies in Learning (iJET) 14, no. 24 (2019): 121. http://dx.doi.org/10.3991/ijet.v14i24.12097.

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Utilization of BLOSSOMS Thermodynamics Energy Conversion video to properly incorporate active learning techniques had been shown to increase the students’ performance in learning introductory Thermodynamics topics. In this study, the effectiveness of using BLOSSOMS Thermodynamics Energy Conver-sion video towards students’ learning in a classroom when adopted by lecturers who is not trained in active learning is investigated. Two groups of undergraduate engineering students from a control class and a treatment class were involved in this study. The students from the treatment class were taught

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Ma, Xin Ling, Xiang Rui Meng, Xin Li Wei, Jia Chang, and Hui Li. "Analysis and Optimization of ORC for Low-Temperature Waste Heat Power Generation." Advanced Materials Research 383-390 (November 2011): 6614–20. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.6614.

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This paper presents energy analysis, thermodynamic calculation and exergy analysis for waste heat power generation system of Organic Rankine Cycle based on the first and second laws of thermodynamics. In order to improve system performance, for low-temperature waste heat of 120°C and R245fa organic working fluid, using Aspen Plus software conducted simulation, optimization and improvement. Results from these analyses show that decreasing the expander inlet temperature, increasing inlet pressure of the expander, and adding regenerative heater can increase thermal and exergy efficiencies, at the

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Holubec, Viktor, and Artem Ryabov. "Fluctuations in heat engines." Journal of Physics A: Mathematical and Theoretical 55, no. 1 (2021): 013001. http://dx.doi.org/10.1088/1751-8121/ac3aac.

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Abstract At the dawn of thermodynamics, Carnot’s constraint on efficiency of heat engines stimulated the formulation of one of the most universal physical principles, the second law of thermodynamics. In recent years, the field of heat engines acquired a new twist due to enormous efforts to develop and describe microscopic machines based on systems as small as single atoms. At microscales, fluctuations are an inherent part of dynamics and thermodynamic variables such as work and heat fluctuate. Novel probabilistic formulations of the second law imply general symmetries and limitations for the

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Dukhan, Nihad. "On the worldwide engineering students' meager performance in thermodynamics." QScience Proceedings 2015, no. 4 (2015): 17. http://dx.doi.org/10.5339/qproc.2015.elc2014.17.

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Dukhan, Nihad. "On the worldwide engineering students' meager performance in thermodynamics." QScience Proceedings 2015, no. 4 (2015): 17. http://dx.doi.org/10.5339/qproc.2015.wcee2014.17.

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Akanbi, Olatunde David. "Commentary on the Thermodynamics of a Super-alloy System (AlNi-Cr) Using the Thermocalc Databases." International Journal of Research and Innovation in Applied Science 08, no. 02 (2023): 79–87. http://dx.doi.org/10.51584/ijrias.2023.8201.

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The present study aims to comprehend the thermodynamics of the Al-Ni-Cr superalloy system utilizing the latest Thermocalc 2022b databases. Thermocalc is a software that has a large database which has become vast over the years. The thermodynamic behavior and stability of the system were examined under varying conditions, including temperature and composition. The findings of this study provide crucial insight into the phase behavior and stability of the Al-Ni-Cr superalloy system, which can inform the optimization of its properties and performance for various industrial applications, compared

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Wei, Zhi Guo, Hai Kun Tao, and Yong Li. "Optimization Analysis of Ship Steam Power System with Finite-Time Thermodynamics Theory." Applied Mechanics and Materials 271-272 (December 2012): 1062–66. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.1062.

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A basic model with both property of thermodynamic and heat transfer is obtained by simplifying the prime process of ship Steam Power System (SPS), which is converted into endoreversible Carnot Cycle by the introduction of mean temperature in the cycle process. The design parameters is analyzed and optimized in the view point of finite time thermodynamics (FTT) and entropy generation minimization. Results show that, the temperature ratio (α) and the heat transfer parameter ratio (β) of heat source and heat sink are two important influence factors of cycle system performance, and the increase of

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Rangel, V. B., and A. G. S. Almeida. "CASCADE REFRIGERATION SYSTEM FOR LOW TEMPERATURES USING NATURAL FLUIDS." Revista de Engenharia Térmica 20, no. 2 (2021): 20. http://dx.doi.org/10.5380/reterm.v20i2.81783.

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Cascade refrigeration systems work with two or more serial disposed cycles and can obtain internal temperatures below -60°C, which is necessary for several activities in medicine and scientific research. This paper presents a thermodynamic analysis of cascade system refrigeration using natural refrigerant fluids for ultra-low temperatures. These fluids are environmentally friendly refrigerant and are an alternative to hydro chlorofluorocarbons (HCFCs) and to hydrofluorocarbons (HFCs). Energy and exergy analyses were performed using a thermodynamic model based on the law of conservation of mass

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Lou, De Cang, Wen Guo, Zhi Guo Wang, and Yong Hong Wang. "Integrated Thermal Management System Design for Advanced Propulsion System." Applied Mechanics and Materials 232 (November 2012): 723–29. http://dx.doi.org/10.4028/www.scientific.net/amm.232.723.

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Thermal management system (TMS) design is considered to be a key technology for advanced aero engines and supersonic or hypersonic propulsion systems. In this paper, the concepts of coupling flow and thermodynamic networks are proposed for TMS design. In this method, the propulsion system is considered to be a zero-dimensional flow system. Components, subsystems and hence the entire engine system can be modelled using some basic flow and thermodynamics networks. The platform for TMS design, ThermalM, is developed based on this model. As an example, modelling for a Turbine Based Combined Cycle

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Nogueira, E. "Thermodynamic Performance of Boehmite Alumina Nanoparticle Shapes in the Counterflow Double Pipe Heat Exchanger." Journal of Engineering Sciences 9, no. 1 (2022): F1—F10. http://dx.doi.org/10.21272/jes.2022.9(1).f1.

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This work compares a theoretical model with a consolidated numerical model related to the thermodynamic performance of boehmite alumina nanoparticles in different formats in a counterflow double pipe heat exchanger. The shapes of the non-spherical nanoparticles under analysis are platelets, blades, cylindrical, and bricks. The second law of thermodynamics is applied to determine Nusselt number, pressure drop, thermal efficiency, thermal and viscous irreversibilities, Bejan number, and the out temperature of the hot fluid. The entropy generation rates associated with the temperature field and t

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Miguel, Antonio F. "Towards an Exergy Analysis of Diffusive and Non-Diffusive Processes in Living Organisms." Diffusion Foundations 7 (June 2016): 177–84. http://dx.doi.org/10.4028/www.scientific.net/df.7.177.

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Living organisms are open dissipative thermodynamic systems that rely on mechano-thermo-electrochemical interactions to survive. Plant physiological processes allow plants to survive by converting solar radiation into chemical energy, and store that energy in form that can be used. Mammals catabolize food to obtain energy that is used to fuel, build and repair the cellular components. The exergy balance is a combined statement of the first and second laws of thermodynamics. It provides insight into the performance of systems. In this paper, exergy balance equations for both mammal’s and green

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Amirfakhraei, Amirhossein, Jamshid Khorshidi, and Taleb Zarei. "A thermodynamic modeling of 2-bed adsorption desalination to promote main equipment performance." Journal of Water Reuse and Desalination 11, no. 1 (2021): 136–46. http://dx.doi.org/10.2166/wrd.2021.059.

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Abstract Adsorption desalination utilizes the discrete adsorption of the water vapor from the evaporator, and is capable of being discharged to the condenser. This study illuminated an advanced cycle of mass and heat recovery among beds, condensers, and evaporators. Morover, the thermodynamic modeling of adsorption desalination systems (ADS) under different operating conditions was investigated. Furthermore, its effect on the evaporator vapor production and the water vapor adsorption and desorption in the adsorption beds were accounted for. Parenthetically, the mathematical model of ADS thermo

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Huirem, Boris, and Pradeepta Kumar Sahoo. "Thermodynamic Modeling and Performance Optimization of a Solar-Assisted Vapor Absorption Refrigeration System (SAVARS)." International Journal of Air-Conditioning and Refrigeration 28, no. 01 (2020): 2050006. http://dx.doi.org/10.1142/s2010132520500066.

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A thermodynamic steady-state model for a single-effect lithium bromide–water (LiBr-H2O)-based vapor absorption refrigeration system of 17.5[Formula: see text]kW capacities has been presented using the first and second laws of thermodynamics. The mass, energy and exergy balance equations in each component of the vapor absorption cycle have been fitted into a computer program to carry out the calculation using the thermo-physical properties of the working fluid. The performance parameters such as coefficient of performance (COP), exergy coefficient of performance (ECOP), total exergy destruction

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Chen, L., J. Li, and F. Sun. "Heat transfer effect on optimal performance of two-stage thermoelectric heat pumps." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 221, no. 12 (2007): 1635–41. http://dx.doi.org/10.1243/09544062jmes740.

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A model of two-stage semiconductor thermoelectric heat pumps with external heat transfer and internal irreversibility is built. Performance of the heat pump with Newton's heat transfer law is analysed and optimized using the combination of finite-time thermodynamics and non-equilibrium thermodynamics. The analytical formula about heating load versus working electrical current, and the coefficient of performance (COP) versus working electrical current are derived. For the fixed total number of thermoelectric elements, the ratio of number of thermo-electric elements of top stage to the total num

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Wang, Zhi Yu, Song Zhou, Ruo Han Li, Cai Ling Li, and He Fu Zhang. "Exergetic Cost Analysis of Marine Diesel Engine Waste Heat Recovery System Based on Matrix Model Thermo-Economics." Advanced Materials Research 744 (August 2013): 566–70. http://dx.doi.org/10.4028/www.scientific.net/amr.744.566.

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Diesel engine is the main power of the marine vessel, its thermal efficiency is the highest in all thermodynamic engines, but still more than 50% of the energy is not being used, so making full use of the waste heat of the main diesel engine scientifically and effectively, not only reduce the fuel consumption and the shipping cost, but also reduce the value of the ship EEDI effectively. To be able to design and transform the green ship, thermodynamic analyzing of the ship power plant and master the energy utilization of each part is necessary. Raising the efficiency of an energy system is with

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Ticu, Ionela, and Elena Gogu. "ASSESSMENT OF THE PERFORMANCE A VAPOUR COMPORESSION. REFRIGERATION CYCLE WORKING WITH AMMONIA." Journal of Marine Technology and Environment 2022, no. 1 (2022): 84–87. http://dx.doi.org/10.53464/jmte.01.2022.12.

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his paper is a part of the efforts done in order to analyse the performance of vapour compression refrigeration cycles. These technologies are used with a high rate in marine refrigeration and are responsible for important amounts of energy consumptions. The obtained results are indicating the fact that the performance of the cycle is decreased when increasing the condensation temperature and keeping constant the evaporation temperature. Gains in the performance are obtained when degrees of superheating and sub cooling are increased, resulting that the cycle with superheating and sub cooling i

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Li, Yong, Xiaoyan Zhu, Yawei Zhai, et al. "Research on High Performance Fe3Si-Si3N4-SiC Composite Used for Blast Furnace." Open Materials Science Journal 6, no. 1 (2012): 1–5. http://dx.doi.org/10.2174/1874088x01206010001.

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Excellent Fe3Si-Si3N4-SiC composites were successfully prepared with FeSi75 and SiC as main starting materials by nitridation reaction(at 1300°C for 8Hrs). The material properties were studied; the ferrosilicon nitridation mechanism was analyzed through chemical thermodynamics; phase composition, microstructure, corrosion resistance of products were also investigated. The results are shown that the comprehensive properties of Fe3Si-Si3N4-SiC are outstanding. The nitridation products are fiber-like α-Si3N4 and rod-like β-Si3N4, which makes better mechanical behavior due to fiber reinforcement;

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Yang, Hui Shan. "The Influence of Thermal Resistances and Nonperfect Regenerative Losses on the Performance of a Ferroelectric Ericsson Refrigerator." Advanced Materials Research 1006-1007 (August 2014): 168–72. http://dx.doi.org/10.4028/www.scientific.net/amr.1006-1007.168.

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Using the finite-time thermodynamics, the influence of thermal resistances and nonperfect regenerative losses on the optimal performance of a ferroelectric Ericsson refrigeration-cycle is analyzed. Based on the thermodynamics properties of ferroelectric materials and a linear heat-transfer law, the inherent regenerative losses in the cycle are calculated and the fundamental optimum relations and other relevant performance parameters are determined. The ecological optimization criterion of the refrigerator is derived. The results obtained here may reveal the general characteristics of the ferro

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Xu, Xing, Yu Wu, and Na Hu. "Particle Swarm Algorithms with Different Thermodynamics Mechanisms and Performance Comparison." Information Technology Journal 13, no. 7 (2014): 1361–65. http://dx.doi.org/10.3923/itj.2014.1361.1365.

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Osara, Jude A., and Michael D. Bryant. "Performance and degradation characterization of electrochemical power sources using thermodynamics." Electrochimica Acta 365 (January 2021): 137337. http://dx.doi.org/10.1016/j.electacta.2020.137337.

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Rupam, Tahmid Hasan, Md Amirul Islam, Animesh Pal, and Bidyut Baran Saha. "Adsorption thermodynamics and performance indicators of selective adsorbent/refrigerant pairs." Applied Thermal Engineering 175 (July 2020): 115361. http://dx.doi.org/10.1016/j.applthermaleng.2020.115361.

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Adesanya, Samuel O., Ramosheuw S. Lebelo, and K. C. Moloi. "Evaluation of Heat Irreversibility in a Thin Film Flow of Couple Stress Fluid on a Moving Belt." Advances in Mathematical Physics 2018 (November 1, 2018): 1–6. http://dx.doi.org/10.1155/2018/6237592.

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This article addresses the inherent heat irreversibility in the flow of a couple stress thin film along a moving vertical belt subjected to free and adiabatic surface. Mathematical analysis for the fluid-governing-equations is performed in detail. For maximum thermal performance and efficiency, the present analysis follows the second law of thermodynamics approach for the evaluation of entropy generation rate in the moving film. With this thermodynamic process, the interconnectivity between variables responsible for energy wastage is accounted for in the thermo-fluid equipment. Results of the

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