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Journal articles on the topic 'Thermodynamic cycle'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Sparavigna, Amelia Carolina. "Teaching Reitlinger Cycles To Improve Students' Knowledge And Comprehension Of Thermodynamics." MECHANICS, MATERIALS SCIENCE & ENGINEERING JOURNAL. - ISSN 2412-5954 2016, no. 1 (2016): 78–83. https://doi.org/10.5281/zenodo.3367256.

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The second law of thermodynamics puts a limit on the thermal efficiency of heat engines. This limit value is the efficiency of the ideal reversible engine represented by the Carnot cycle. During the lectures on physics, the emphasis on this cycle is generally so strong that students could be induced to consider the Carnot cycle as the only cycle having the best thermal efficiency. In fact, an entire class of cycles exists possessing the same maximum efficiency: this class is that of the regenerative Reitlinger cycles. Here we propose to teach also these cycles to the engineering students of ph

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2

Tuttle, Kenneth L., and Chih Wu. "Computer-Based Thermodynamics." Journal of Educational Technology Systems 30, no. 4 (2002): 427–36. http://dx.doi.org/10.2190/b0x1-r5pw-lcyj-yyme.

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A new computer-based approach to teaching thermodynamics is being developed and tried by two mechanical engineering professors at the U.S. Naval Academy. The course uses sophisticated software, in this case CyclePad, to work all of the homework problems. A new text, written with traditional theory but computer-based problems, accommodates the new approach. The new course is scheduled for Fall Term 2001 at the Naval Academy. Computer-based thermodynamics courses teach the same theory as traditional thermodynamics courses as well as the same types of problems. However, traditional thermodynamic

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3

Rashkovskiy, S. A. "Hamiltonian Thermodynamics." Nelineinaya Dinamika 16, no. 4 (2020): 557–80. http://dx.doi.org/10.20537/nd200403.

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It is believed that thermodynamic laws are associated with random processes occurring in the system and, therefore, deterministic mechanical systems cannot be described within the framework of the thermodynamic approach. In this paper, we show that thermodynamics (or, more precisely, a thermodynamically-like description) can be constructed even for deterministic Hamiltonian systems, for example, systems with only one degree of freedom. We show that for such systems it is possible to introduce analogs of thermal energy, temperature, entropy, Helmholtz free energy, etc., which are related to eac

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Rivera, Wilfrido, Karen Sánchez-Sánchez, J. Alejandro Hernández-Magallanes, J. Camilo Jiménez-García, and Alejandro Pacheco. "Modeling of Novel Thermodynamic Cycles to Produce Power and Cooling Simultaneously." Processes 8, no. 3 (2020): 320. http://dx.doi.org/10.3390/pr8030320.

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Thermodynamic cycles to produce power and cooling simultaneously have been proposed for many years. The Goswami cycle is probably the most known cycle for this purpose; however, its use is still very limited. In the present study, two novel thermodynamic cycles based on the Goswami cycle are presented. The proposed cycles use an additional component to condense a fraction of the working fluid produced in the generator. Three cycles are modeled based on the first and second laws of thermodynamics: Two new cycles and the original Goswami cycle. The results showed that in comparison with the orig

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Tozer, R. M., and R. W. James. "Cold Generation Systems: A Theoretical Approach." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 209, no. 4 (1995): 287–96. http://dx.doi.org/10.1243/pime_proc_1995_209_008_01.

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The objective of this study was to derive the thermodynamic formulae for ideal combined driving and cooling cycles when the objective of the overall cycle is to produce cooling by using a high-temperature heat source. For this it has been necessary to investigate absorption cooling thermodynamics and to focus on the analysis of one-, two- and three-stage cycles and multi-stage cycles in general. This paper has investigated the absorption thermodynamic principles involved to obtain simple formulae, in a similar way to the Carnot cycle. The first driving cycle considered has a high-temperature s

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6

Miao, Jian-Guo, Chun-Wang Wu, Wei Wu, and Ping-Xing Chen. "Entropy Exchange and Thermodynamic Properties of the Single Ion Cooling Process." Entropy 21, no. 7 (2019): 650. http://dx.doi.org/10.3390/e21070650.

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A complete quantum cooling cycle may be a useful platform for studying quantum thermodynamics just as the quantum heat engine does. Entropy change is an important feature which can help us to investigate the thermodynamic properties of the single ion cooling process. Here, we analyze the entropy change of the ion and laser field in the single ion cooling cycle by generalizing the idea in Reference (Phys. Rev. Lett. 2015, 114, 043002) to a single ion system. Thermodynamic properties of the single ion cooling process are discussed and it is shown that the Second and Third Laws of Thermodynamics

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7

Panarella, Emilio. "Energy saving and climate change mitigation through improved thermodynamic efficiency." Physics Essays 33, no. 3 (2020): 283–88. http://dx.doi.org/10.4006/0836-1398-33.3.283.

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The second Law of Thermodynamics is fundamental in the analysis of thermodynamic cycles. It dictates that the conversion of heat to work is limited. It reaches an upper limit in a classical thermodynamic cycle, and such a limit is provided by the Carnot cycle, which is the most efficient. Motivated by a recent allowance of a patent to this author (U.S. Patent 10,079,075), the present study tutorially attempts to expand on the subject and shows that the efficiency can go above the Carnot efficiency, provided a novel cycle is used, and heat, rather than being discarded, is recirculated in the sa

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8

Silva, Jojomar Lucena, and José Raimundo Novaes Chiappin. "A geometria como instrumento heurístico da reformulação da termodinâmica na representação de ciclos para a de potenciais." Principia: an international journal of epistemology 21, no. 3 (2018): 291–315. http://dx.doi.org/10.5007/1808-1711.2017v21n3p291.

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History shows that up to 1870’s, the thermodynamic cycles, particularly Carnot’s cycle, were the most important heuristic instruments as much to formulate the general laws of physics as well to deduce the experimental laws. From this moment on, this instrument falls into disuse with surprising rapidity. At the end of this decade emerges a new thermodynamic formulation, proposed by Gibbs, the thermodynamics of the potentials. This sudden transition from thermodynamic of cycles to potentials was triggered by the difficult to approach the emergence of the phase transition phenomena with the diagr

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9

Fang, Xiaona, and Jin Wang. "Nonequilibrium Thermodynamics in Cell Biology: Extending Equilibrium Formalism to Cover Living Systems." Annual Review of Biophysics 49, no. 1 (2020): 227–46. http://dx.doi.org/10.1146/annurev-biophys-121219-081656.

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We discuss new developments in the nonequilibrium dynamics and thermodynamics of living systems, giving a few examples to demonstrate the importance of nonequilibrium thermodynamics for understanding biological dynamics and functions. We study single-molecule enzyme dynamics, in which the nonequilibrium thermodynamic and dynamic driving forces of chemical potential and flux are crucial for the emergence of non-Michaelis-Menten kinetics. We explore single-gene expression dynamics, in which nonequilibrium dissipation can suppress fluctuations. We investigate the cell cycle and identify the nutri

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10

Betelmal, E. H., and Mohamed A. Naas. "The Value of Kalina Cycle in Engineering." International Journal of Research and Scientific Innovation XI, no. IX (2024): 1028–37. http://dx.doi.org/10.51244/ijrsi.2024.1109084.

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Environmental issues and lack of energy resources have led to the utilization of industrial waste heat in thermodynamic applications to improve the performance of thermodynamic cycles and keep pace with climate change. This work examines the modified thermodynamic Kalina cycle to compare different cycle efficiencies. We then evolve the exergy balance equation for it to apply to each cycle component. Furthermore, we discuss future technologies for the modified Kalina cycle using a new working fluid.

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11

Pandit, Tanmoy, Pritam Chattopadhyay, and Goutam Paul. "Non-commutative space engine: A boost to thermodynamic processes." Modern Physics Letters A 36, no. 24 (2021): 2150174. http://dx.doi.org/10.1142/s0217732321501741.

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We introduce quantum heat engines that perform quantum Otto cycle and the quantum Stirling cycle by using a coupled pair of harmonic oscillator as its working substance. In the quantum regime, different working medium is considered for the analysis of the engine models to boost the efficiency of the cycles. In this work, we present Otto and Stirling cycle in the quantum realm where the phase space is non-commutative in nature. By using the notion of quantum thermodynamics, we develop the thermodynamic variables in non-commutative phase space. We encounter a catalytic effect (boost) on the effi

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12

Ibrahim, O. M., and S. A. Klein. "High-Power Multi-Stage Rankine Cycles." Journal of Energy Resources Technology 117, no. 3 (1995): 192–96. http://dx.doi.org/10.1115/1.2835340.

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This paper presents an analysis of the multi-stage Rankine cycle aiming at optimizing the power output from low-temperature heat sources such as geothermal or waste heat. A design methodology based on finite-time thermodynamics and the maximum power concept is used in which the shape and the power output of the maximum power cycle are identified and utilized to compare and evaluate different Rankine cycle configurations. The maximum power cycle provides the upper-limit power obtained from any thermodynamic cycle for specified boundary conditions and heat exchanger characteristics. It also prov

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13

Nie, Xu Tao, Wan Hua Chen, and Yuan Xing Wang. "Numerical Simulation Study on High-Cycle Fatigue Damage for Metals." Advanced Materials Research 941-944 (June 2014): 1477–82. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.1477.

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High-cycle fatigue damage analysis and life prediction is a most crucial problem in the research field of solid mechanics. Based on the thermodynamic potentials in the framework of thermodynamics a numerical method for high-cycle fatigue damage was studied and provided by using a two-scale damage model. Furthermore, according to the “jump-in-cycles” procedure the numerical simulation of high-cycle fatigue damage was implemented in a user subroutine of ABAQUS software. Finally, a numerical simulation instance of high-cycle fatigue damage was provided and compared with a set of test data, which

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14

Invernizzi, Costante Mario, and Gioele Di Marcoberardino. "An Overview of Real Gas Brayton Power Cycles: Working Fluids Selection and Thermodynamic Implications." Energies 16, no. 10 (2023): 3989. http://dx.doi.org/10.3390/en16103989.

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This paper discusses and reviews the main real gas effects on the thermodynamic performance of closed Brayton cycles. Cycles with carbon dioxide as working fluids are taken as a reference and a comparison of the thermodynamic cycle efficiencies that are made with other possible working fluids (pure fluids and fluid mixtures). We fixed the reduced operating conditions, in optimal conditions, so that all working fluids had the same thermodynamic global performances. Therefore, the choice of the working fluid becomes important for adapting the cycle to the different technological requirements. Th

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15

Khalatov, A. A., O. S. Stupak, M. S. Grishuk, and O. I. Galaka. "Novel combined thermodynamic cycle." Reports of the National Academy of Sciences of Ukraine, no. 2 (March 2, 2018): 58–64. http://dx.doi.org/10.15407/dopovidi2018.02.058.

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16

Giuma, M. Fellah. "A comparative thermodynamic analysis of Organic Rankine Cycles (ORC) and kalina cycle for low-grade energy resources." i-manager’s Journal on Future Engineering and Technology 19, no. 1 (2023): 1. http://dx.doi.org/10.26634/jfet.19.1.20123.

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This work aims to contribute to the issue of producing electrical power and reducing the emissions of gases into the atmosphere by utilizing low grade energy sources such as solar energy, geothermal energy and the energy that is rejected from industrial processes. The Organic Rankine Cycle (ORC) and Kalina are two cycles used to utilize low-grade energy sources. Each of them differs in the structure and in the working fluids. The organic Rankine cycle uses organic materials as working fluids, such as benzene, R-600a, methanol, propane, R-245f, i-pentane and ammonia while Kalina cycle uses a mi

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17

Egorov, Aleksey, Natalya Lysyannikova, Yuri Kaizer, et al. "Thermodynamic work in inline piston gasoline engines as a function of crank angle." E3S Web of Conferences 164 (2020): 03021. http://dx.doi.org/10.1051/e3sconf/202016403021.

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The purpose of this research work is to identify the laws of thermodynamic operation in the theoretical cycles of four-stroke inline piston gasoline internal combustion engines (ICE). The main results: dependence of the thermodynamic operation of the working body of ICE in theoretical cycles of four-stroke inline piston gasoline engines as a function of the angle of rotation of the crankshaft; regularities of uneven generation of positive thermodynamic operation in the theoretical cycle of four-stroke inline one-, two-, three -, five-cylinder piston gasoline ICE; regularities of the alternatin

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18

Méndez-Cruz, Ladislao Eduardo, Miguel-Ángel Gutiérrez-Limón, Raúl Lugo-Leyte, and Mauricio Sales-Cruz. "Thermodynamic Optimization of Trigeneration Power System." Energies 17, no. 12 (2024): 3048. http://dx.doi.org/10.3390/en17123048.

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Worldwide, the growing demand for energy has been largely met through power cycles utilizing fossil fuels. Combined cycles, which integrate a gas turbine with a steam cycle, prove to be the best alternative due to their power generation capacity and high efficiencies. This efficiency is primarily attributed to the ability to harness exhaust gases to generate steam in the heat recovery boiler, allowing additional power generation through the steam turbine. Currently, there is a quest for the integration of low-temperature power cycles to maximize the utilization of residual thermal energy flows

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19

Bellos, Evangelos. "Development of a Semi-Empirical Model for Estimating the Efficiency of Thermodynamic Power Cycles." Sci 5, no. 3 (2023): 33. http://dx.doi.org/10.3390/sci5030033.

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Power plants constitute the main sources of electricity production, and the calculation of their efficiency is a critical factor that is needed in energy studies. The efficiency improvement of power plants through the optimization of the cycle is a critical means of reducing fuel consumption and leading to more sustainable designs. The goal of the present work is the development of semi-empirical models for estimating the thermodynamic efficiency of power cycles. The developed model uses only the lower and the high operating temperature levels, which makes it flexible and easily applicable. Th

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20

Osuolale, Funmilayo, Oladipupo Ogunleye, Mary Fakunle, Abdulfataah Busari, and Yetunde Abolanle. "Comparative studies of Cu-Cl Thermochemical Water Decomposition Cyles for Hydrogen Production." E3S Web of Conferences 61 (2018): 00009. http://dx.doi.org/10.1051/e3sconf/20186100009.

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This research focuses on thermodynamic analysis of the copper chlorine cycles. The cycles were simulated using Aspen Plus software. All thermodynamic data for all the chemical species were defined from literature and the reliability of other compounds in the simulation were ascertained. The 5-step Cu–Cl cycle consist of five steps; hydrolysis, decomposition, electrolysis, drying and hydrogen production. The 4-step cycle combines the hydrolysis and the drying stage of the 5-step cycle to eliminate the intermediate production and handling of copper solids. The 3-step cycle has hydrolysis, electr

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21

Chen, Lingen, Huijun Feng, and Yanlin Ge. "Power and Efficiency Optimization for Open Combined Regenerative Brayton and Inverse Brayton Cycles with Regeneration before the Inverse Cycle." Entropy 22, no. 6 (2020): 677. http://dx.doi.org/10.3390/e22060677.

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A theoretical model of an open combined cycle is researched in this paper. In this combined cycle, an inverse Brayton cycle is introduced into regenerative Brayton cycle by resorting to finite-time thermodynamics. The constraints of flow pressure drop and plant size are taken into account. Thirteen kinds of flow resistances in the cycle are calculated. On the one hand, four isentropic efficiencies are used to evaluate the friction losses in the blades and vanes. On the other hand, nine kinds of flow resistances are caused by the cross-section variances of flowing channels, which exist at the e

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22

Necmi, OZDEMIR*. "THERMODYNAMIC ANALYSIS OF RECUPERATED GAS TURBINE COGENERATION CYCLES." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 12 (2017): 636–42. https://doi.org/10.5281/zenodo.1133901.

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Cogeneration cycles have better advantages over the conventional cycles. In this study, the performances of the recuperated cogeneration cycles are analyzed. For the calculation of the enthalpy and the entropy values of the streams, a computer program written by the author in FORTRAN codes is used. Exergy analysis is done for the air-fuel preheated cogeneration cycle. The results present that by changing the compression rate from 6 to 16, the electric power increases about 20-40 %, but the heat power decreases about 10-30 % for the air-fuel preheated cycle. The decrease of the heat power is ab

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23

Avsec, Jurij. "The calculation of specific heats for some important solid components in hydrogen production process based on CuCl cycle." Thermal Science 18, no. 3 (2014): 823–31. http://dx.doi.org/10.2298/tsci1403823a.

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Hydrogen is one of the most promising energy sources of the future enabling direct production of power and heat in fuel cells, hydrogen engines or furnaces with hydrogen burners. One of the last remainder problems in hydrogen technology is how to produce a sufficient amount of cheap hydrogen. One of the best options is large scale thermochemical production of hydrogen in combination with nuclear power plant. copper-chlorine (CuCl) cycle is the most promissible thermochemical cycle to produce cheap hydrogen.This paper focuses on a CuCl cycle, and the describes the models how to calculate thermo

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24

Domenikos, George-Rafael, and Alexander V. Mantzaris. "A possible thermodynamic definition and equation of state for a model of political election cycles." PLOS ONE 19, no. 3 (2024): e0300113. http://dx.doi.org/10.1371/journal.pone.0300113.

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This work demonstrates how a simulation of political discourse can be formulated using variables of the agents’ behaviors in a simulation, as thermodynamic variables. With these relations the methodology provides an approach to create a correspondence between the variables of an agent based social system and those of a thermodynamic system. Extended from this observation, diagrams akin to a P-V diagram for gases can be created for this social system. The basic thermodynamic variables of temperature, pressure and volume are defined from a system of agents with political and non-political action

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25

Knight, Randall D. "Exploring counterclockwise thermodynamic cycles." American Journal of Physics 92, no. 7 (2024): 511–19. http://dx.doi.org/10.1119/5.0152547.

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A common belief is that any closed, counterclockwise cycle on a pV diagram represents a refrigerator or heat pump. It has been established that this is not the case, but previous papers on this topic have made unnecessary assumptions about the temperatures of the energy reservoirs and about how the system exchanges energy with the reservoirs. Relaxing these assumptions leads to a wide array of unexpected behaviors. In some cases, the same pV cycle can be a heat pump, a cold pump, or a Joule pump simply by changing how the system is connected to the reservoirs. This paper explores the strange w

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Necmi, Ozdemir*. "THERMODYNAMIC ANALYSIS OF GAS TURBINE COGENERATION POWER PLANTS." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 9 (2016): 736–42. https://doi.org/10.5281/zenodo.155102.

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Cogeneration cycles have many advantages over the conventional cycles. In this study, the performances of the simple and the air preheated cogeneration cycles are compared with each other. To calculate the enthalpy and entropy values of the streams, a computer program written by the author in FORTRAN codes is used. Exergy analysis is done for the simple and the air preheated cogeneration cycles. The results present that by changing the compression rate from 6 to 16, the electric power increases about 20 %, but the heat power decreases about 11 % for the simple cycle. By changing excess air rat

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27

Eden, Carsten. "Revisiting the Energetics of the Ocean in Boussinesq Approximation." Journal of Physical Oceanography 45, no. 3 (2015): 630–37. http://dx.doi.org/10.1175/jpo-d-14-0072.1.

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AbstractFollowing a suggestion by Tailleux, a consistent formulation of internal energy, the first law of thermodynamics, and the thermodynamic potentials for an ocean in Boussinesq approximation with a nonlinear equation of state is given. A modification of the pressure work in the first law is the only necessary modification from which all thermodynamic potentials and thermodynamic relations follow in a consistent way. This treatment of thermodynamics allows for a closed and explicit formulation of conservation equations for dynamic and potential reservoirs of both enthalpy and internal ener

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28

Rangel, Victor Bitencour, Antonio Gabriel Souza Almeida, Francisco Souza Almeida, and Luiz Gustavo da Cruz Duarte. "CASCADE REFRIGERATION SYSTEM FOR LOW TEMPERATURES USING NATURAL FLUIDS." REVISTA FOCO 15, no. 1 (2022): e295. http://dx.doi.org/10.54751/revistafoco.v15n1-013.

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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 areenvironmentally 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 massa

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Piwowarski, Marian, Krzysztof Kosowski, and Marcin Richert. "Organic Supercritical Thermodynamic Cycles with Isothermal Turbine." Energies 16, no. 12 (2023): 4745. http://dx.doi.org/10.3390/en16124745.

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Organic Rankine cycles (ORC) are quite popular, but the overall efficiencies of these plants are rather very low. Numerous studies have been conducted in many scientific centers and research centers to improve the efficiency of such cycles. The research concerns both the modification of the cycle and the increase in the parameters of the medium at the inlet to the turbine. However, the efficiency of even these modified cycles rarely exceeds 20%. The plant modifications and the optimization of the working medium parameters, as a rule, lead to cycles with the high pressure and high temperature o

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30

Joseph, Antonio, and Gireeshkumaran Thampi. "Heat leak term: A signature of irreversibility in analysing the actual SI engine cycle using finite-time thermodynamics." FME Transactions 50, no. 4 (2022): 655–63. http://dx.doi.org/10.5937/fme2204655j.

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Due to the headway in innovations, it ends up noticeably unavoidable to do a complex thermodynamic analysis of thermal systems. The major problem faced during the development of a thermodynamic model for the analysis is to check the feasibility of the proposed model contrasted with the current options. Finite Time Thermodynamics can be utilized adequately to meet this without going for a mind-boggling investigation. Nonetheless, if the process is divided into infinitesimally small processes with the irreversibilities accounted at all equilibrium conditions; a reversible thermodynamic approach

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Morosuk, Tatiana, Ruslan Nikulshin, and Larisa Morosuk. "Entropy-cycle method for analysis of refrigeration machine and heat pump cycles." Thermal Science 10, no. 1 (2006): 111–24. http://dx.doi.org/10.2298/tsci0601111m.

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Real and ideal cycles of any complexity can be compared through the definition of the irreversibility's and ways of their minimization in the thermodynamic analysis. The paper considers the use of entropy-cycle method for thermodynamic analysis of refrigerating machines and heat pumps. Using this method preconditions of practical use for analysis, synthesis, and optimization have been created. The methodology of the entropy-cycle method can be use in many areas of the scientific work and educational process.

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Udriste, Constantin, Vladimir Golubyatnikov, and Ionel Tevy. "Economic Cycles of Carnot Type." Entropy 23, no. 10 (2021): 1344. http://dx.doi.org/10.3390/e23101344.

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Originally, the Carnot cycle was a theoretical thermodynamic cycle that provided an upper limit on the efficiency that any classical thermodynamic engine can achieve during the conversion of heat into work, or conversely, the efficiency of a refrigeration system in creating a temperature difference by the application of work to the system. The first aim of this paper is to introduce and study the economic Carnot cycles concerning Roegenian economics, using our thermodynamic–economic dictionary. These cycles are described in both a Q−P diagram and a E−I diagram. An economic Carnot cycle has a m

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Kosowski, Krzysztof, and Marian Piwowarski. "Subcritical Thermodynamic Cycles with Organic Medium and Isothermal Expansion." Energies 13, no. 17 (2020): 4340. http://dx.doi.org/10.3390/en13174340.

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The efficiencies of the Organic Rankine Cycle (ORC) are not very high and only very seldom do they exceed 20%. The increase and optimization of initial parameters and certain modifications of the thermodynamic cycle make it possible to overcome these drawbacks. A new modified cycle has been described and analyzed in detail in the paper. Similarly to the Ericsson cycle for gas turbines, isothermal expansion in the turbine is suggested for the power plant with organic media. The new cycle and the typical ORC power plants have the same block diagram. The only difference is that expansion in the p

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Vijayaraghavan, Sanjay, and D. Y. Goswami. "Organic Working Fluids for a Combined Power and Cooling Cycle." Journal of Energy Resources Technology 127, no. 2 (2005): 125–30. http://dx.doi.org/10.1115/1.1885039.

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A new thermodynamic cycle has been developed for the simultaneous production of power and cooling from low-temperature heat sources. The proposed cycle combines the Rankine and absorption refrigeration cycles, providing power and cooling as useful outputs. Initial studies were performed with an ammonia-water mixture as the working fluid in the cycle. This work extends the application of the cycle to working fluids consisting of organic fluid mixtures. Organic working fluids have been used successfully in geothermal power plants, as working fluids in Rankine cycles. An advantage of using organi

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Ahmed, Aram Mohammed, László Kondor, and Attila R. Imre. "Thermodynamic Efficiency Maximum of Simple Organic Rankine Cycles." Energies 14, no. 2 (2021): 307. http://dx.doi.org/10.3390/en14020307.

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The increase of the maximal cycle temperature is considered as one of the best tools to increase cycle efficiency for all thermodynamic cycles, including Organic Rankine Cycles (ORC). Technically, this can be done in various ways, but probably the best solution is the use of hybrid systems, i.e., using an added high-temperature heat source to the existing low-temperature heat source. Obviously, this kind of improvement has technical difficulties and added costs; therefore, the increase of efficiency by increasing the maximal temperature sometimes has technical and/or financial limits. In this

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Ahmed, Aram Mohammed, László Kondor, and Attila R. Imre. "Thermodynamic Efficiency Maximum of Simple Organic Rankine Cycles." Energies 14, no. 2 (2021): 307. http://dx.doi.org/10.3390/en14020307.

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The increase of the maximal cycle temperature is considered as one of the best tools to increase cycle efficiency for all thermodynamic cycles, including Organic Rankine Cycles (ORC). Technically, this can be done in various ways, but probably the best solution is the use of hybrid systems, i.e., using an added high-temperature heat source to the existing low-temperature heat source. Obviously, this kind of improvement has technical difficulties and added costs; therefore, the increase of efficiency by increasing the maximal temperature sometimes has technical and/or financial limits. In this

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37

ITO, Takehiro, Tomohiko YAMAGUCHI, and Shigehisa SUGITA. "Thermodynamic Evaluation of HAT Cycle." Transactions of the Japan Society of Mechanical Engineers Series B 63, no. 607 (1997): 1111–18. http://dx.doi.org/10.1299/kikaib.63.1111.

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38

Swedan, Nabil. "Photosynthesis as a thermodynamic cycle." Heat and Mass Transfer 56, no. 5 (2019): 1649–58. http://dx.doi.org/10.1007/s00231-019-02768-x.

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Kosoy, Boris, Larisa Morozyuk, Sergii Psarov, and Artem Kukoliev. "Synthesis of scheme-cycle designs of absorption water-ammonia thermotransformers with extended degazation zone." Eastern-European Journal of Enterprise Technologies 4, no. 8(112) (2021): 23–33. http://dx.doi.org/10.15587/1729-4061.2021.238203.

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The search for new and improvement of existing technical design of energy converter systems for specific consumers requires a reasonable choice of the most rational design for these objects. Thermotransformers that operate on the reverse and mixed thermodynamic cycles, in combination with power plants utilizing renewable and non-traditional primary energy (fuel), are considered to be of interest for small-scale power generation (trigeneration systems), which is consistent with the concept of distributed energy generation. Cold in trigeneration systems is provided by heat-using thermotransforme

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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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Kanaujiya, Amit. "Thermodynamic study of solarized supercritical carbon dioxide cycle." International Journal of Advance Research and Innovation 8, no. 4 (2020): 148–53. http://dx.doi.org/10.51976/ijari.842024.

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The supercritical carbon dioxide cycle run on the utilization of carbon dioxide uses emissions from fossil fuel-fired power plants. In this study, the supercritical carbon dioxide cycle is powered by solar energy using heliostat fields. The operating range of supercritical carbon dioxide cycle permits for the integration of low-temperature cycles for effective utilization of the heat remaining unutilized in it. This paper considers the supercritical carbon dioxide cycle for its energy analysis. It aims for the optimal utilization of heat available with the exhaust from the sCO2 cycle. Results

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Reyes-Belmonte, Miguel Angel, and Francesco Rovense. "High-Efficiency Power Cycles for Particle-Based Concentrating Solar Power Plants: Thermodynamic Optimization and Critical Comparison." Energies 15, no. 22 (2022): 8579. http://dx.doi.org/10.3390/en15228579.

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This paper investigates and compares several highly efficient thermodynamic cycles that are suitable for coupling with particle-in-tube fluidized-bed solar receiver technology. In such a receiver, high-temperature particles are used as both a heat transfer fluid and a storage medium. A dense particle suspension (DPS) is created through an upward bubbling fluidized-bed (UBFB) flow inside the receiver tubes, which constitutes the “particle-in-tube” solar receiver concept. Reaching higher temperatures is seen as a key factor for future cost reductions in the solar plant, as this leads to both hig

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Thorbergsson, Egill, and Tomas Grönstedt. "A Thermodynamic Analysis of Two Competing Mid-Sized Oxyfuel Combustion Combined Cycles." Journal of Energy 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/2438431.

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A comparative analysis of two mid-sized oxyfuel combustion combined cycles is performed. The two cycles are the semiclosed oxyfuel combustion combined cycle (SCOC-CC) and the Graz cycle. In addition, a reference cycle was established as the basis for the analysis of the oxyfuel combustion cycles. A parametric study was conducted where the pressure ratio and the turbine entry temperature were varied. The layout and the design of the SCOC-CC are considerably simpler than the Graz cycle while it achieves the same net efficiency as the Graz cycle. The fact that the efficiencies for the two cycles

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Zheng, Renchuan, Erlei Gong, Jianzhong Li, Qian Yao, and Zhaolong Nie. "Performance Analysis of Wave Rotor Combustor Integration into Baseline Engines: A Comparative Study of Pressure-Gain and Work Cycles." Energies 17, no. 9 (2024): 2074. http://dx.doi.org/10.3390/en17092074.

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This study presents two concepts for integrating a wave rotor combustor (WRC) into a baseline engine: the wave rotor pressure-gain cycle (WRPGC) and the wave rotor work cycle (WRWC). Performance parameters were calculated under different thermodynamic cycles, and a comparative analysis of the thermodynamic cycles was conducted, considering both the ideal- and actual-loss conditions. Furthermore, the impact of the WRC precompression ratio, turbine inlet temperature, and fixed peak cycle temperature on the thermodynamic-cycle performance was investigated. The results indicate that embedding a WR

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Dhirendra, Singh. "THE EFFECT OF DIFFERENT TEMPERATURES ON THE ADSORPTION OF ENDOSULPHAN ON RED LOAM SOIL." International Journal of Current Pharmaceutical Review and Research 10, no. 1 (2018): 10–14. https://doi.org/10.5281/zenodo.12672549.

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The significant adsorption isotherms, Freundlich constants (K, and N), disseminationcoefficient (Kd), and other thermodynamic boundaries were used to take into account theadsorption thermodynamics of endosulphan on Tarai sandy topsoil soil at 10 °C, 20 °C, and40 °C, respectively. The data were well fitted by the Freundlich condition and yielded Lformed isotherms at all of the temperatures considered. In order to anticipate the concept ofthe adsorption cycle, thermodynamic boundaries such as the thermodynamic balance steady(Ko), the standard free energy change (G°), the standard

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Mariani, Elisa, Lorenzo Talluri, and Giampaolo Manfrida. "Thermodynamic and Exergetic Analysis of the Allam Cycle." Global Journal of Energy Technology Research Updates 8 (December 28, 2021): 19–34. http://dx.doi.org/10.15377/2409-5818.2021.08.2.

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This paper presents the study on the current developments of oxy-combustion thermodynamic cycles, which use the CO2 produced by combustion within the cycle itself without releases into the atmosphere. This is the cause of the attention paid to this type of technology and which makes these cycles one of the avant-gardes of power plants. In particular, this study focuses on the analysis of the Allam cycle with the aim of evaluating its performance and therefore investigating whether it may be an alternative to the series of CO2 control technologies. In this paper, a first principle efficiency of

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Martinelli, Mario. "Entropy, Carnot Cycle, and Information Theory." Entropy 21, no. 1 (2018): 3. http://dx.doi.org/10.3390/e21010003.

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The fundamental intuition that Carnot had in analyzing the operation of steam machines is that something remains constant during the reversible thermodynamic cycle. This invariant quantity was later named “entropy” by Clausius. Jaynes proposed a unitary view of thermodynamics and information theory based on statistical thermodynamics. The unitary vision allows us to analyze the Carnot cycle and to study what happens when the entropy between the beginning and end of the isothermal expansion of the cycle is considered. It is shown that, in connection with a non-zero Kullback–Leibler distance, mi

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Quan, Hai-Tao, Hui Dong, and Chang-Pu Sun. "Theoretical and experimental progress of mesoscopic statistical thermodynamics." Acta Physica Sinica 72, no. 23 (2023): 230501. http://dx.doi.org/10.7498/aps.72.20231608.

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Does thermodynamics still hold true for mecroscopic small systems with only limited degrees of freedom? Do concepts such as temperature, entropy, work done, heat transfer, isothermal processes, and the Carnot cycle remain valid? Does the thermodynamic theory for small systems need modifying or supplementing compared with traditional thermodynamics applicable to macroscopic systems? Taking a single-particle system for example, we investigate the applicability of thermodynamic concepts and laws in small systems. We have found that thermodynamic laws still hold true in small systems at an ensembl

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Boris, Kosoy, Morozyuk Larisa, Psarov Sergii, and Kukoliev Artem. "Synthesis of scheme-cycle designs of absorption water-ammonia thermotransformers with extended degazation zone." Eastern-European Journal of Enterprise Technologies 4, no. 8 (112) (2021): 23–33. https://doi.org/10.15587/1729-4061.2021.238203.

Full text

Abstract:

The search for new and improvement of existing technical design of energy converter systems for specific consumers requires a reasonable choice of the most rational design for these objects. Thermotransformers that operate on the reverse and mixed thermodynamic cycles, in combination with power plants utilizing renewable and non-traditional primary energy (fuel), are considered to be of interest for small-scale power generation (trigeneration systems), which is consistent with the concept of distributed energy generation. Cold in trigeneration systems is provided by heat-using thermotransforme

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50

Ayub, Abubakr, Costante M. Invernizzi, Gioele Di Marcoberardino, Paolo Iora, and Giampaolo Manzolini. "Carbon Dioxide Mixtures as Working Fluid for High-Temperature Heat Recovery: A Thermodynamic Comparison with Transcritical Organic Rankine Cycles." Energies 13, no. 15 (2020): 4014. http://dx.doi.org/10.3390/en13154014.

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This study aims to provide a thermodynamic comparison between supercritical CO2 cycles and ORC cycles utilizing flue gases as waste heat source. Moreover, the possibility of using CO2 mixtures as working fluids in transcritical cycles to enhance the performance of the thermodynamic cycle is explored. ORCs operating with pure working fluids show higher cyclic thermal and total efficiencies compared to supercritical CO2 cycles; thus, they represent a better option for high-temperature waste heat recovery provided that the thermal stability at a higher temperature has been assessed. Based on the

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