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Journal articles on the topic 'Thermodynamic cycles'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 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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Bryant, Samuel J., and Benjamin B. Machta. "Energy dissipation bounds for autonomous thermodynamic cycles." Proceedings of the National Academy of Sciences 117, no. 7 (2020): 3478–83. http://dx.doi.org/10.1073/pnas.1915676117.

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How much free energy is irreversibly lost during a thermodynamic process? For deterministic protocols, lower bounds on energy dissipation arise from the thermodynamic friction associated with pushing a system out of equilibrium in finite time. Recent work has also bounded the cost of precisely moving a single degree of freedom. Using stochastic thermodynamics, we compute the total energy cost of an autonomously controlled system by considering both thermodynamic friction and the entropic cost of precisely directing a single control parameter. Our result suggests a challenge to the usual unders

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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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4

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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5

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

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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7

Włodarczyk, Julia. "Comparative Analysis of the Course of Business Cycles and Thermodynamic Cycles." Equilibrium 6, no. 1 (2011): 127–39. http://dx.doi.org/10.12775/equil2011.007.

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Mainstream economics tends to perceive economic systems in a mechanistic way, which makes it impossible to grasp the notion of the irreversibility of real economic processes and thus encourages referring to the achievements of thermodynamics.Although economic equivalents of thermodynamic quantities have been discussed for more than a hundred years, a significant development of thermodynamic techniques of modeling economic phenomena, that could complement standard econometric methods, has not been observed.It seems that a comparative analysis of the course of thermodynamic and business cycles

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8

Chuvilin, E. M., T. Ebinuma, Y. Kamata, et al. "Effects of temperature cycling on the phase transition of water in gas-saturated sediments." Canadian Journal of Physics 81, no. 1-2 (2003): 343–50. http://dx.doi.org/10.1139/p03-028.

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Experimental results on hydrate- and ice-formation conditions in the pores of sandy sediments that have undergone temperature cycles are presented. Thermodynamic parameters of gas hydrate and ice formation in porous space were determined for CH4 and CO2 saturated sandy sediments. The experiments indicate that temperature and freezing cycles affect the thermodynamics of hydrate and waterice in gas-saturated sediments. Temperature cycles increased the hydrate accumulation in the pore space of sediments and reduce the freezing temperature of the remaining pore water. PACS Nos.: 91.60Hg, 92.40Sn

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9

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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Gawthrop, Peter J., and Edmund J. Crampin. "Energy-based analysis of biochemical cycles using bond graphs." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 470, no. 2171 (2014): 20140459. http://dx.doi.org/10.1098/rspa.2014.0459.

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Thermodynamic aspects of chemical reactions have a long history in the physical chemistry literature. In particular, biochemical cycles require a source of energy to function. However, although fundamental, the role of chemical potential and Gibb's free energy in the analysis of biochemical systems is often overlooked leading to models which are physically impossible. The bond graph approach was developed for modelling engineering systems, where energy generation, storage and transmission are fundamental. The method focuses on how power flows between components and how energy is stored, transm

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Ruggieri, Paolo, Maarten H. P. Ambaum, and Jonas Nycander. "Thermodynamic Cycles in the Stratosphere." Journal of the Atmospheric Sciences 77, no. 6 (2020): 1897–912. http://dx.doi.org/10.1175/jas-d-19-0188.1.

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Abstract Large-scale overturning mass transport in the stratosphere is commonly explained through the action of potential vorticity (PV) rearrangement in the flank of the stratospheric jet. Large-scale Rossby waves, with their wave activity source primarily in the troposphere, stir and mix PV and an overturning circulation arises to compensate for the zonal torque imposed by the breaking waves. In this view, any radiative heating is relaxational and the circulation is mechanically driven. Here we present a fully thermodynamic analysis of these phenomena, based on ERA-Interim data. Streamfuncti

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12

da Silva, M. F. Ferreira. "Some considerations about thermodynamic cycles." European Journal of Physics 33, no. 1 (2011): 13–42. http://dx.doi.org/10.1088/0143-0807/33/1/002.

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13

Nolan, Michael J. "Thermodynamic cycles—one more time." Physics Teacher 33, no. 9 (1995): 573–75. http://dx.doi.org/10.1119/1.2344309.

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14

Öztürk, A., A. Şenel, and S. U. Onbaşıo??lu. "Thermodynamic optimization of combined cycles." International Journal of Energy Research 29, no. 7 (2005): 657–70. http://dx.doi.org/10.1002/er.1098.

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15

Açikkalp, Emin. "Models for optimum thermo-ecological criteria of actual thermal cycles." Thermal Science 17, no. 3 (2013): 915–30. http://dx.doi.org/10.2298/tsci110918095a.

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In this study, the ecological optimization point of irreversible thermal cycles (refrigerator, heat pump and power cycles) was investigated. The importance of ecological optimization is to propose a way to use fuels and energy source more efficiently because of an increasing energy need and environmental pollution. It provides this by maximizing obtained (or minimizing supplied) work and minimizing entropy generation for irreversible (actual) thermal cycles. In this research, ecological optimization was defined for all basic irreversible thermal cycles, by using the first and second laws of th

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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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17

Mohammadi, Saber, and Akram Khodayari. "Pyroelectric Energy Harvesting: With Thermodynamic-Based Cycles." Smart Materials Research 2012 (April 5, 2012): 1–5. http://dx.doi.org/10.1155/2012/160956.

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This work deals with energy harvesting from temperature variations using ferroelectric materials as a microgenerator. The previous researches show that direct pyroelectric energy harvesting is not effective, whereas thermodynamic-based cycles give higher energy. Also, at different temperatures some thermodynamic cycles exhibit different behaviours. In this paper pyroelectric energy harvesting using Lenoir and Ericsson thermodynamic cycles has been studied numerically and the two cycles were compared with each other. The material used is the PMN-25 PT single crystal that is a very interesting m

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18

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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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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20

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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21

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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22

Imre, Attila R., and Axel Groniewsky. "Various Ways of Adiabatic Expansion in Organic Rankine Cycle (ORC) and in Trilateral Flash Cycle (TFC)." Zeitschrift für Physikalische Chemie 233, no. 4 (2019): 577–94. http://dx.doi.org/10.1515/zpch-2018-1292.

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Abstract For energy production and conversion, the use of thermodynamic cycles is still the most common way. To find the optimal solution is a multiparametric optimization problem, where some parameters are related to thermodynamic and physical chemistry, while others are associated with costs, safety, or even environmental issues. Concerning the thermodynamic aspects of the design, the selection of the working fluid is one of the crucial points. Here, we are going to show different types of adiabatic expansion processes in various pure working fluids, pointing out the ones preferred in Organi

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23

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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24

Inozemtsev, N. N. "Thermodynamic cycles for spacecraft power plants." Russian Aeronautics (Iz VUZ) 53, no. 4 (2010): 443–49. http://dx.doi.org/10.3103/s1068799810040112.

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25

Liang, J. "Thermodynamic cycles in oscillating flow regenerators." Journal of Applied Physics 82, no. 9 (1997): 4159–65. http://dx.doi.org/10.1063/1.366217.

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26

Ochkov, V. F., A. A. Aleksandrov, V. A. Voloshchuk, E. V. Dorokhov, and K. A. Orlov. "Calculations of thermodynamic cycles via internet." Thermal Engineering 56, no. 1 (2009): 86–89. http://dx.doi.org/10.1134/s0040601509010145.

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27

Swenson, R., and M. T. Turvey. "Thermodynamic Reasons for Perception--Action Cycles." Ecological Psychology 3, no. 4 (1991): 317–48. http://dx.doi.org/10.1207/s15326969eco0304_2.

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28

Wu, Jun W., Eric J. Hu, and Mark J. Biggs. "Thermodynamic cycles of adsorption desalination system." Applied Energy 90, no. 1 (2012): 316–22. http://dx.doi.org/10.1016/j.apenergy.2011.04.049.

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29

Kitanovski, A., U. Plaznik, J. Tušek, and A. Poredoš. "New thermodynamic cycles for magnetic refrigeration." International Journal of Refrigeration 37 (January 2014): 28–35. http://dx.doi.org/10.1016/j.ijrefrig.2013.05.014.

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30

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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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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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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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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Yeğiner, Y., S. Kenç, İ. Özkol, and Güven Kömürgöz. "ECOP Based Comparative Study of Thermodynamic Cycles." Applied Mechanics and Materials 390 (August 2013): 655–59. http://dx.doi.org/10.4028/www.scientific.net/amm.390.655.

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This study extends the application of thermo-ecological optimization technique for different thermodynamic cycles such as Brayton, Rankine, Otto. The ECOP function for these cycles will be developed and tested for efficiencies and entropy generations. And graphical representation of these developed ECOP functions will be presented in terms of governing parameters. The comparisons of all common cycles are presented by using finite-time ecological optimization.

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Layton, Astrid, John Reap, Bert Bras, and Marc Weissburg. "Correlation between Thermodynamic Efficiency and Ecological Cyclicity for Thermodynamic Power Cycles." PLoS ONE 7, no. 12 (2012): e51841. http://dx.doi.org/10.1371/journal.pone.0051841.

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36

Cerri, G. "Parametric Analysis of Combined Gas-Steam Cycles." Journal of Engineering for Gas Turbines and Power 109, no. 1 (1987): 46–54. http://dx.doi.org/10.1115/1.3240005.

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Combined gas-steam cycles have been analyzed from the thermodynamic point of view. Suitable thermodynamics indices—explained in Appendix A—have been utilized. The parameters that most influence efficiency have been singled out and their ranges of variability have been specified. Calculations have been carried out—see Appendix B—taking into account the state of the art for gas turbines and the usual values for the quantities of steam cycles. The results are given. The maximal gas turbine temperature has been varied between 800°C and 1400°C. The gas turbine pressure ratio has been analyzed in th

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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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Yuan, Z., and E. E. Michaelides. "Binary-Flashing Geothermal Power Plants." Journal of Energy Resources Technology 115, no. 3 (1993): 232–36. http://dx.doi.org/10.1115/1.2905999.

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Binary-flashing units utilize new types of geothermal power cycles, which may be used with resources of relatively low temperatures (less than 150°C) where other cycles result in very low efficiencies. The thermodynamic cycles for the binary flashing units are combinations of the geothermal binary and flashing cycles. They have most of the advantages of these two conventionally used cycles, but avoid the high irreversibilities associated with some of their processes. Any fluid with suitable thermodynamic properties may be used in the secondary Rankine cycle. At the optimum design conditions bi

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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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Dalakov, Petar, Erik Neuber, Jürgen Klier, and Ralf Herzog. "Innovative neon refrigeration unit operating down to 30 K." MATEC Web of Conferences 324 (2020): 01003. http://dx.doi.org/10.1051/matecconf/202032401003.

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A new compact, low-cost, economically competitive and environmentally friendly cryogenic system for cooling a continuous gas flow down to about 30 K is under developing at the ILK Dresden, reported in this paper. The paper shows thermodynamic calculations of cycles on neon and neon-helium mixtures. The assessment of the degree of thermodynamic perfection of the neon cycles in comparison of neon-helium cycles is provided. The use of neon and neon-helium mixture in cryogenic cycles for cryostatting at a temperature level of 27…63 K will increase the thermodynamic efficiency of the cryogenic syst

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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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El-Masri, M. A. "Exergy Analysis of Combined Cycles: Part 1—Air-Cooled Brayton-Cycle Gas Turbines." Journal of Engineering for Gas Turbines and Power 109, no. 2 (1987): 228–36. http://dx.doi.org/10.1115/1.3240029.

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Quantitative analytical tools based on the second law of thermodynamics provide insight into the complex optimization tradeoffs encountered in the design of a combined cycle. These tools are especially valuable when considering approaches beyond the existing body of experience, whether in cycle configuration or in gas turbine cooling technology. A framework for such analysis was provided by the author [1-3] using simplified, constant-property models. In this paper, this theme is developed to include actual chemical and thermodynamic properties as well as relevant practical design details refle

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Kua, Jeremy, Alexandra L. Hernandez, and Danielle N. Velasquez. "Thermodynamics of Potential CHO Metabolites in a Reducing Environment." Life 11, no. 10 (2021): 1025. http://dx.doi.org/10.3390/life11101025.

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How did metabolism arise and evolve? What chemical compounds might be suitable to support and sustain a proto-metabolism before the advent of more complex co-factors? We explore these questions by using first-principles quantum chemistry to calculate the free energies of CHO compounds in aqueous solution, allowing us to probe the thermodynamics of core extant cycles and their closely related chemical cousins. By framing our analysis in terms of the simplest feasible cycle and its permutations, we analyze potentially favorable thermodynamic cycles for CO2 fixation with H2 as a reductant. We fin

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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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Pauluis, Olivier M. "The Mean Air Flow as Lagrangian Dynamics Approximation and Its Application to Moist Convection." Journal of the Atmospheric Sciences 73, no. 11 (2016): 4407–25. http://dx.doi.org/10.1175/jas-d-15-0284.1.

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Abstract This paper introduces the Mean Airflow as Lagrangian Dynamics Approximation (MAFALDA), a new method designed to extract thermodynamic cycles from numerical simulations of turbulent atmospheric flows. This approach relies on two key steps. First, mean trajectories are obtained by computing the mean circulation using height and equivalent potential temperature as coordinates. Second, thermodynamic properties along these trajectories are approximated by using their conditionally averaged values at the same height and θe. This yields a complete description of the properties of air parcels

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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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Dumka, Pankaj, Kritik Rana, Surya Pratap Singh Tomar, Parth Singh Pawar, and Dhananjay R. Mishra. "Modelling air standard thermodynamic cycles using python." Advances in Engineering Software 172 (October 2022): 103186. http://dx.doi.org/10.1016/j.advengsoft.2022.103186.

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Narayan, G. Prakash, Mostafa H. Sharqawy, John H. Lienhard V, and Syed M. Zubair. "Thermodynamic analysis of humidification dehumidification desalination cycles." Desalination and Water Treatment 16, no. 1-3 (2010): 339–53. http://dx.doi.org/10.5004/dwt.2010.1078.

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Babac, G., and A. Sisman. "Thermodynamic Cycles Based on Classical Thermosize Effects." Journal of Computational and Theoretical Nanoscience 8, no. 9 (2011): 1720–26. http://dx.doi.org/10.1166/jctn.2011.1872.

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Pliego, Josefredo R. "Thermodynamic cycles and the calculation of pKa." Chemical Physics Letters 367, no. 1-2 (2003): 145–49. http://dx.doi.org/10.1016/s0009-2614(02)01686-x.

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