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Journal articles on the topic 'Specific enthalpy of the working bogy'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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1

Berliand, M., and R. Ishchenko. "CALCULATION OF THE EXPANSION PROCESS OF THE FLOW OF WORKING BODY IN THE NOZZLE OF A LIQUID-PHASE NUCLEAR ROCKET ENGINE." Slovak international scientific journal, no. 95 (May 15, 2025): 86–92. https://doi.org/10.5281/zenodo.15427667.

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In this work, flow parameters of the working body (hydrogen) were calculated at the inlet, throat, and exit sections of the liquid-phase nuclear rocket engine nozzle. A method was proposed for determining the specific impulse of thrust while accounting for losses due to scattering, friction, and variations in the specific enthalpy of the working body caused by non-adiabatic effects. The calculated specific impulse exceeded 9500 m/s, significantly surpassing the performance of chemical rocket engines. The evaluation of the thermogasdynamic parameters of the working body expansion confirmed the
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2

Gogo, V., S. Podkopaiev, and N. Chernykh. "JUSTIFICATION OF COMPLEX LABOR PROTECTION MEASURES FOR MINERS BY MINE AIR QUALITY FACTORS." Naukovyi visnyk Donetskoho natsionalnoho tekhnichnoho universytetu, no. 1 (2023): 40–52. http://dx.doi.org/10.31474/2415-7902-2023-1-40-52.

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The results of an analytical-experimental study related to the actual task of substantiating comprehensive measures for occupational safety of miners in deep coal mines on the factors of mine air quality based on the study of hydrodynamic air conditioning processes, which is especially important for the development of autonomous and energy-saving means of ensuring miners' occupational safety standards, are presented. Purpose. The goal is to substantiate and analytically study the main thermodynamic characteristics of the process of hydraulic mine air conditioning for the development of functio
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3

Vorobieva, Hanna S. "Modification of the Redlich-Kwong-Aungier Equation of State to Determine the Main Thermodynamic Parameters in the Pure Liquid CO2 Region." Journal of Mechanical Engineering 25, no. 1 (2022): 6–13. http://dx.doi.org/10.15407/pmach2022.02.006.

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The most important parameters for determining the state of real gas and the thermodynamic properties of the working fluid in a pure liquid region are pressure, specific volume, enthalpy and entropy. The paper presents a modified Redlich-Kwong-Aungier equation of state for determining pressure, specific volume, enthalpy and entropy in the pure liquid phase of real gas. CO2 was selected as the studied working fluid. When solving this problem, the author identified the main parameters of liquid carbon dioxide thermo-dynamics with the least error in comparison with experimental data in a wide rang
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4

Wei, Li Li, Yu Feng Zhang, Yong Chao Mu, Xiao Chen Yang, and Hong Ting Ma. "Influencing Factors of Low-Grade Energy Conversion System Using ORCs." Applied Mechanics and Materials 193-194 (August 2012): 206–10. http://dx.doi.org/10.4028/www.scientific.net/amm.193-194.206.

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Rankine cycles using organic working fluids are widely believed feasible in recovering low enthalpy-containing heat. Through the analysis, the enthalpy difference, the dryness of inlet wet steam and evaporating and condensing temperature have significant influence on the energy conversion efficiency. The power output also relies on the specific volume and latent heat, which determine the mass flow rate. The results serve good guideline for experiments and systematic optimization.
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5

Kazakova, A. I., I. G. Yakovlev, and I. K. Garkushin. "Study of phase equilibria in a two-component system diphenyloxide <i>- n -</i> nonadecane." Расплавы, no. 1 (June 14, 2024): 17–25. http://dx.doi.org/10.31857/s0235010624010027.

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Using the Schroeder, UNIFAC and UNIFAC Dortmund methods, the fusibility diagram of the diphenyloxide – n –nonadecane system was calculated and it was shown that it belongs to the eutectic type. Individual substances and their mixtures were studied experimentally using a differential scanning microcalorimeter. On the DTA heating curve of the eutectic alloy, two endo-effects are noted, corresponding to the polymorphic transition of n–nonadecane and the melting of the eutectic. A comparison of the eutectic coordinates calculated by these methods with experimental data is presented. For a eutectic
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6

قدّاح, عاصم. "Studying of the changes effect of the gas properties on the turbine performance using Gordon-McBride algorithm." FES Journal of Engineering Sciences 7, no. 1 (2014): 19. http://dx.doi.org/10.52981/fjes.v7i1.99.

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The turbine performance parameters are calculated assuming that the working fluid is a calorically perfect gas with constant specific heats, whereas it is actually a perfect gas. We will study the of the working fluid properties on the turbine performance according to Gordon-McBride algorithm which determines changes of the specific heat and the enthalpy as a function of the temperature and the fuel to air, and suggest an alternatives if the studying was carried out as calorically perfect gas.
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7

Yang, De Ming, and Bo Han Tian. "Characterization of the Expanded Plasma Jet Generated at Reduced Chamber Pressure." Applied Mechanics and Materials 644-650 (September 2014): 4892–95. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.4892.

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Very low pressure plasma spraying has been attracted attention due to special properties of the expanded plasma jet which may probably deposit specific and unique structure coatings, such as columnar structure coatings. The forming of the coatings is affected by plasma generating and working conditions. These operating parameters such as arc power, plasma gas flow rate, and chamber pressure have influences on pressure, enthalpy and temperature of plasma jet. In this work, an enthalpy probe is applied to measure the enthalpy of argon-hydrogen plasma jet generated at chamber pressure of 3000 Pa
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8

Shevchenko, Mykhailo, Maya Ambrozhevich, and Kseniia Fesenko. "Working process model development of the gas turbine engine combustor fueling on methanol." Eastern-European Journal of Enterprise Technologies 2, no. 1 (128) (2024): 49–54. http://dx.doi.org/10.15587/1729-4061.2024.301325.

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The use of methanol as a fuel for aircraft and stationary gas turbine engines (GTE) is a priority direction in engine building. It is well known that when modeling the GTE performances using first-level mathematical models, there is an error in calculating specific fuel consumption, which is caused by the simplified description of the GTE combustor working process. The object of the study is the working process in the GTE combustor fueling on methanol. The peculiarity of the developed mathematical model of the working process of the GTE combustor is the use of enthalpy dependencies on temperat
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9

Trawiński, Paweł. "Development and implementation of mathematical models of working mediums for gas part of combined cycle gas turbine system in Python programming environment." E3S Web of Conferences 137 (2019): 01047. http://dx.doi.org/10.1051/e3sconf/201913701047.

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The working mediums in the gas turbine systems are: atmospheric air, natural gas and exhaust gases. For the detailed analysis of thermodynamic performance and values at characteristic points of the cycle it is necessary to know the relations defining: specific volume, specific isobaric and isochoric heat capacity, isentropic exponent, specific enthalpy and specific entropy. Mathematical models of thermodynamic parameters for the mentioned mediums were developed based on dependencies for mixtures of ideal and semi-ideal gases. The functions obtained for semi-ideal gas mixtures were extended by
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10

Nowak, Władysław, Aleksandra Borsukiewicz-Gozdur, and Sławomir Wiśniewski. "Influence of working fluid evaporation temperature in the near-critical point region on the effectiveness of ORC power plant operation." Archives of Thermodynamics 33, no. 3 (2012): 73–83. http://dx.doi.org/10.2478/v10173-012-0019-7.

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Abstract In the paper presented are definitions of specific indicators of power which characterize the operation of the organic Rankine cycle (ORC) plant. These quantities have been presented as function of evaporation temperature for selected working fluids of ORC installation. In the paper presented also is the procedure for selection of working fluid with the view of obtaining maximum power. In the procedure of selection of working fluid the mentioned above indicators are of primary importance. In order to obtain maximum power there ought to be selected such working fluids which evaporate c
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11

Lewins, J. D. "The ideal gas Joule cycle at maximum specific work." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 214, no. 12 (2000): 1545–51. http://dx.doi.org/10.1243/0954406001523470.

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The condition for maximum specific work from a gas-turbine engine operated on a Joule cycle is generalized to ideal gases from the well-known result obtained by using a perfect gas. An obvious corollary is shown to be the principal theorem, when the working substance is an ideal gas with specific heat capacities varying with temperature, that the turbine outlet and compressor outlet temperatures are equal. Two additional corollaries are shown to hold in general. A simple study shows that the optimum condition point is not much affected by real departures from reversible behaviour. The conditio
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12

Li, Yiqun, Na Li, Chunhuan Luo, and Qingquan Su. "Thermodynamic Performance of a Double-Effect Absorption Refrigeration Cycle Based on a Ternary Working Pair: Lithium Bromide + Ionic Liquids + Water." Energies 12, no. 21 (2019): 4200. http://dx.doi.org/10.3390/en12214200.

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For an absorption cycle, a ternary working pair LiBr–[BMIM]Cl(2.5:1)/H2O was proposed as a new working pair to replace LiBr/H2O. The thermodynamic properties including specific heat capacity, specific enthalpy, density, and viscosity were systematically measured and fitted by the least-squares method. The thermodynamic performance of a double-effect absorption refrigeration cycle based on LiBr–[BMIM]Cl(2.5:1)/H2O was investigated under different refrigeration temperatures from 5 °C to 12 °C. Results showed that the ternary working pair LiBr–[BMIM]Cl(2.5:1)/H2O had advantages in the operating t
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13

Byrne, Ciara, Alenka Ristić, Suzana Mal, Mojca Opresnik, and Nataša Zabukovec Logar. "Evaluation of ZIF-8 and ZIF-90 as Heat Storage Materials by Using Water, Methanol and Ethanol as Working Fluids." Crystals 11, no. 11 (2021): 1422. http://dx.doi.org/10.3390/cryst11111422.

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The increasing demand for heating/cooling is of grave concern due to the ever-increasing population. One method that addresses this issue and uses renewable energy is Thermochemical Energy Storage (TCES), which is based on the reversible chemical reactions and/or sorption processes of gases in solids or liquids. Zeolitic imidazolate frameworks (ZIFs), composed of transition metal ions (Zn, Co, etc.) and imidazolate linkers, have gained significant interest recently as porous adsorbents in low temperature sorption-based TES (sun/waste heat). In this study, we examined two different sodalite-typ
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14

Yu, Tong, and Jing Qi Yuan. "Properties Database of Working Medium for Full Scope Simulation of Coal-Fired Power Plant." Advanced Materials Research 732-733 (August 2013): 357–61. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.357.

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A properties database of working medium is developed based on the IAWPS-IF97 mathematical model to satisfy the demand of the accurate properties of full scope simulation of coal-fired power plant. The database provides the continuous relationship of the specific enthalpy, the density and the specific heat capacity as the function of the pressure and temperature. On this basis, a graphical user interface is designed to ensure the database can be used as a separate software kit. The error caused by regression algorithm can be avoided in the properties database. The properties database is suit fo
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15

Li, Yiqun, Na Li, Chunhuan Luo, and Qingquan Su. "Study on a Quaternary Working Pair of CaCl2-LiNO3-KNO3/H2O for an Absorption Refrigeration Cycle." Entropy 21, no. 6 (2019): 546. http://dx.doi.org/10.3390/e21060546.

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When compared with LiBr/H2O, an absorption refrigeration cycle using CaCl2/H2O as the working pair needs a lower driving heat source temperature, that is, CaCl2/H2O has a better refrigeration characteristic. However, the crystallization temperature of CaCl2/H2O solution is too high and its absorption ability is not high enough to achieve an evaporation temperature of 5 °C or lower. CaCl2-LiNO3-KNO3(15.5:5:1)/H2O was proposed and its crystallization temperature, saturated vapor pressure, density, viscosity, specific heat capacity, specific entropy, and specific enthalpy were measured to retain
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16

Shubenko, Oleksandr, Volodymyr Goloshchapov, Olga Kotulska, and Tetyana Paramonova. "APPROXIMATE RELATIONSHIPS FOR DETERMINING THE ENTHALPIES OF WATER AND STEAM IN THE CALCULATIONS OF HEAT EXCHANGER DEVICES OF STEAM TURBINE INSTALLATIONS (PART II – DETERMINATION OF THE ENTHALPY OF WATER STEAM)." Bulletin of the National Technical University "KhPI". Series: Hydraulic machines and hydraulic units, no. 2 (March 6, 2025): 12–17. https://doi.org/10.20998/2411-3441.2024.2.02.

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The conducted studies are the II part of a complex work on creating a methodological approach for determining the enthalpy of water and water vapor in the calculations of heat exchange equipment for operational control of the operating modes of large power steam turbines, when the use of tables of thermodynamic properties of working media in the "manual" mode is not successful. The current part II of the work, in contrast to part I, where the determination of the enthalpy of water is considered, is devoted to the determination of the enthalpy of water vapor. A methodological approach of obtain
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17

Rolka, Paulina, Roman Kwidzinski, Tomasz Przybylinski, and Adam Tomaszewski. "Thermal Characterization of Medium-Temperature Phase Change Materials (PCMs) for Thermal Energy Storage Using the T-History Method." Materials 14, no. 23 (2021): 7371. http://dx.doi.org/10.3390/ma14237371.

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To reduce energy consumption and increase energy efficiency in the building sector, thermal energy storage with phase change materials (PCMs) is used. The knowledge of the thermophysical properties and the characteristics of PCMs (like their enthalpy changes and the distribution of stored energy over a specified temperature range) is essential for proper selection of the PCM and optimal design of the latent thermal energy store (LHTES). This paper presents experimental tests of the thermophysical properties of three medium-temperature PCMs: OM65, OM55, RT55, which can be used in domestic hot w
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18

Wang, Huaiyou, Jinli Li, Yuan Zhong, Xu Liu, and Min Wang. "Novel Wide-Working-Temperature NaNO3-KNO3-Na2SO4 Molten Salt for Solar Thermal Energy Storage." Molecules 29, no. 10 (2024): 2328. http://dx.doi.org/10.3390/molecules29102328.

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A novel ternary eutectic salt, NaNO3-KNO3-Na2SO4 (TMS), was designed and prepared for thermal energy storage (TES) to address the issues of the narrow temperature range and low specific heat of solar salt molten salt. The thermo-physical properties of TMS-2, such as melting point, decomposition temperature, fusion enthalpy, density, viscosity, specific heat capacity and volumetric thermal energy storage capacity (ETES), were determined. Furthermore, a comparison of the thermo-physical properties between commercial solar salt and TMS-2 was carried out. TMS-2 had a melting point 6.5 °C lower and
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19

Sun, Kunfeng. "Modelica Modeling of Thermodynamic Properties of LiBr-H2O Solutions." Academic Journal of Science and Technology 7, no. 3 (2023): 305–8. http://dx.doi.org/10.54097/ajst.v7i3.13422.

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Absorption refrigeration system is one of the basic refrigeration systems, with LiBr-H2O solution being the most common working fluid. In order to perform thermodynamic design and analysis on the absorption refrigeration cycle, it is essential to develop a program to calculate the thermodynamic properties of the solution. Modelica is the most promising digital twin modeling language and has been widely used in heat flow system modeling. In this study, a new interface library for calculating the thermophysical properties of LiBr-H2O solution is introduced. This library can calculate the vapor p
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20

Danov, S. N., and A. K. Gupta. "Influence of Imperfections in Working Media on Diesel Engine Indicator Process." Journal of Engineering for Gas Turbines and Power 123, no. 1 (2000): 231–39. http://dx.doi.org/10.1115/1.1339986.

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Several improvements to the mathematical model for the indicator process in a diesel engine cylinder are proposed. The thermodynamic behavior of working media is described by the equation of state valid for real gases. Analytical mathematical dependencies between thermal parameters (pressure, temperature, volume) and caloric parameters (internal energy, enthalpy, specific heat capacities) have been obtained. These equations have been applied to the various products encountered during the burning of fuel and the gas mixture as a whole in the engine cylinder under conditions of high pressures. A
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21

Butrymowicz, Dariusz, Kamil Śmierciew, Jarosław Karwacki, Aleksandra Borsukiewicz, and Jerzy Gagan. "Experimental Investigations of Flow Boiling Heat Transfer under Near-Critical Pressure for Selected Working Fluids." Sustainability 14, no. 21 (2022): 14029. http://dx.doi.org/10.3390/su142114029.

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This paper deals with experimental investigations of flow boiling in tubular ducts of selected refrigerants—R134a, R507A, and R600a—under near-critical pressures. Near-critical boiling is characterised by low specific enthalpy of evaporation. The positive effect of this feature is the fact that only a small amount of heat consumed by Organic Rankine Cycles is at a constant temperature. This allows a lower terminal temperature of the heating fluid and more effective utilisation of heat sources, especially of low-grade heat sources. The experimental investigations covered a heat flux density of
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22

Rusanov, А. V., R. A. Rusanov, M. O. Chugay, and S. P. Tretiak. "MODIFIED CALORIC EQUATIONS OF STATE BASED ON THE THERMAL TAMMANN EQUATION." Municipal economy of cities 1, no. 189 (2025): 21–31. https://doi.org/10.33042/2522-1809-2025-1-189-21-31.

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A new version of the caloric equations of state based on the thermal Tammann equation of state (modified Tammann equation of state), in which the specific heat capacities depend on temperature, has been developed. The modified equation of state was developed using the improved Helmholtz energy equation. The modified Tammann equation of state, unlike the original equation, makes it possible to find such local constants that ensure full compliance of thermodynamic (temperature, density, pressure) and caloric (enthalpy, entropy, internal energy) values with the values of a real media at isentropy
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23

Rentz, Anja, Viktor Kühl, Venizelos E. Sourmelis T, et al. "Modeling and identification of the hydration process in a CaO/Ca(OH) 2 -based heat storage system." at - Automatisierungstechnik 71, no. 8 (2023): 584–98. http://dx.doi.org/10.1515/auto-2023-0040.

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Abstract Thermochemical energy storage systems are promising for storing excess energy produced by renewable sources. Of particular interest and the focus of this paper is a specific application based on the reaction pair CaO and H2O. Working towards a model based controller for the reactor storage system, all of the ongoing processes need to be modeled. This publication establishes a model for the hydration process, where heat is recovered from the exothermic reaction of CaO and liquid H2O. The derivations are based on mass and enthalpy balance equations for the reactor and the cooling water.
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24

Gurevich, B., and A. Zohar. "Experimental research of a novel binary solution for diffusion absorption cooling systems." Materialwissenschaft und Werkstofftechnik 55, no. 5 (2024): 700–708. http://dx.doi.org/10.1002/mawe.202400033.

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AbstractThe diffusion absorption refrigeration (DAR) systems are driven by heat and utilize a binary solution along with an inert gas as the working fluid. In commercial applications, the choice of binary solutions operating with an auxiliary gas is typically limited to ammonia‐water or water‐lithium bromide combinations. The focus of this study is to explore the viability of using tetrafluoropropene (R‐1234yf, an HFO refrigerant) as the refrigerant, dimethylacetamide (DMAC) as the absorbent, and helium as the auxiliary gas. As the thermodynamic properties of this specific binary solution are
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25

Davidy, Alon. "Large Eddy Simulation and Thermodynamic Design of the Organic Rankine Cycle Based on Butane Working Fluid and the High-Boiling-Point Phenyl Naphthalene Liquid Heating System." Entropy 24, no. 10 (2022): 1461. http://dx.doi.org/10.3390/e24101461.

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Large Eddy Simulation (LES) and Thermodynamic study have been performed on Organic Rankine Cycle (ORC) components (boiler, evaporator, turbine, pump, and condenser). The petroleum Coke burner provided the heat flux needed for the butane evaporator. High boiling point fluid (called phenyl-naphthalene) has been applied in the ORC. The high boiling liquid is safer (steam explosion hazard may be prevented) for heating the butane stream. It has best exergy efficiency. It is non-corrosive, highly stable, and flammable. Fire Dynamics Simulator software (FDS) has been applied in order to simulate the
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26

Лебедев, Владимир Александрович, та Екатерина Александровна Юшкова. "ЭКСЕРГЕТИЧЕСКИЙ ПИНЧ-АНАЛИЗ ВСЕХ ЭЛЕМЕНТОВ КОТЕЛЬНОГО АГРЕГАТА И КОТЕЛЬНОГО АГРЕГАТА В ЦЕЛОМ". Izvestiya Tomskogo Politekhnicheskogo Universiteta Inziniring Georesursov 331, № 8 (2020): 92–98. http://dx.doi.org/10.18799/24131830/2020/8/2771.

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The relevance of the research is caused by the need to improve the energy efficiency of heating systems, since all types of fuel are becoming more expensive. In this regard, there is a need to create a method of thermodynamic improvement of heat engineering systems. The main aim of the research is the creation of a method for improving heating systems, the application of this method on the example of a boiler unit PP-2650-255 GM. Objects: a direct-flow boiler PP-2650-255 GM, for which a thermodynamic analysis of the processes occurring in individual elements of the boiler – an air heater, econ
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27

Kyritsis, V. E., P. Pilidis, and K. Ramsden. "The representation of GT component maps using Mach numbers." Aeronautical Journal 111, no. 1121 (2007): 453–60. http://dx.doi.org/10.1017/s0001924000004711.

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Abstract Component maps are produced under certain environmental conditions using air as the working fluid during static ground operation. Any changes of the component characteristics when operating under different temperature conditions and/or with different working fluid are partially taken into account, because of the existence of the gas constant and the ratio of the specific heats in the non-dimensional mass flow and rotational speed. This provides a second order correction for the component characteristics, which may be adequate for the initial modeling of engines. However, for rigorous
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28

Puzdrowska, Patrycja. "Evaluation of the significance of the effect of the active cross-sectional area of the inlet air channel on the specific enthalpy of the exhaust gas of a diesel engine using statistics F of the Fisher-Snedecor distribution." Combustion Engines 182, no. 3 (2020): 10–15. http://dx.doi.org/10.19206/ce-2020-302.

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This paper presents the application of Fisher-Snedecor distribution F statistics to assess the significance of the influence of changes in the active cross-sectional area of the inlet air channel (Adol) flow in a diesel engine on the observed diagnostic parameter determined on the basis of measurements of the quick changing exhaust gas temperature in the outlet channel, which is the specific enthalpy of the exhaust gas stream within one engine operating cycle (hspal). A plan of experimental tests carried out on the laboratory stand of a single-cylinder Farymann Diesel type D10 laboratory engin
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29

Soroka, B. S., and N. V. Vorobyov. "Efficiency of the Use of Humidified Gas Fuel and Oxidizing Mixture." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 62, no. 6 (2019): 547–64. http://dx.doi.org/10.21122/1029-7448-2019-62-6-547-564.

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The influence of hydration of the components of combustion (air-oxidizer and – in some cases – fuel) including hydration in the conditions of substitution of natural gas by alternative gas fuels, viz. by coke blast furnace mixture and natural blast furnace mixture – on energy efficiency of the use of different fuels has been determined. Calculations of fuel saving for substitution of natural gas (NG) by wet process gas (blast furnace gas (BFG), coke gas (CG), their mixtures) were performed taking into account real technological parameters (on the example of a specific metallurgical plant). All
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30

Shi, Wei, Jianrong Shi, and Xiaopo Wang. "Determination and Analysis of Solubility of HC-290 (Propane) in [hmim][Tf2N]." Processes 13, no. 4 (2025): 945. https://doi.org/10.3390/pr13040945.

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Seeking the alternative working pairs used in absorption refrigeration cycles is one of the main issues in refrigeration fields due to the drawbacks of traditional H2O/LiBr and NH3/H2O, such as corrosion, crystallization, and toxicity. The imidazolium-based ionic liquid [hmim][Tf2N] has emerged as a promising candidate as an absorbent used in absorption refrigeration systems. In addition, due to having a higher specific heat and higher latent heat of evaporation, hydrocarbons such as HC-290 have been considered as good alternative refrigerants in compression refrigeration cycles. In order to e
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31

PUZDROWSKA, Patrycja. "Identification of damages in the inlet air duct of a diesel engine based on exhaust gas temperature measurements." Combustion Engines 177, no. 2 (2019): 108–14. http://dx.doi.org/10.19206/ce-2019-219.

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The temperature of the exhaust gas of a diesel piston engine, measured in the characteristic control sections of its thermo-flow system, can be a valuable source of diagnostic information about the technical condition of the elements limiting the working spaces thus separated, including the turbocharging system, but also its fuel supply system and replacement of the medium. In standard marine engine measurement systems equipped with an impulse turbocharging system, the exhaust gas temperature is measured at the outlet of individual cylinders and before and after the turbocharger turbine, using
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32

Vorobieva, Hanna S. "Modification of the Redlich-Kwong-Aungier Equation of State to Determine the Degree of Dryness in the CO2 Two-phase Region." Journal of Mechanical Engineering 24, no. 4 (2021): 17–27. http://dx.doi.org/10.15407/pmach2021.04.017.

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The degree of dryness is the most important parameter that determines the state of a real gas and the thermodynamic properties of the working fluid in a two-phase region. This article presents a modified Redlich-Kwong-Aungier equation of state to determine the degree of dryness in the two-phase region of a real gas. Selected as the working fluid under study was CO2. The results were validated using the Span-Wanger equation presented in the mini-REFPROP program, the equation being closest to the experimental data in the CO2 two-phase region. For the proposed method, the initial data are tempera
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33

Dutkowski, Krzysztof, Marcin Kruzel, and Martyna Kochanowska. "Transition Boundary from Laminar to Turbulent Flow of Microencapsulated Phase Change Material Slurry—Experimental Results." Materials 17, no. 24 (2024): 6041. https://doi.org/10.3390/ma17246041.

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An ice slurry or an emulsion of a phase change material (PCM) is a multiphase working fluid from the so-called Latent Functional Thermal Fluid (LFTF) group. LFTF is a fluid that uses, in addition to specific heat, the specific enthalpy of the phase change of its components to transfer heat. Another fluid type has joined the LFTF group: a slurry of encapsulated phase change material (PCM). Technological progress has made it possible for the phase change material to be enclosed in a capsule of the size of the order of micrometers (microencapsulated PCM—mPCM) or nanometers (nanoencapsulated PCM—n
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34

Mollendorf, Joseph C., and David R. Pendergast. "Thermal Protection System for Underwater Use in Cold and Hot Water." Journal of Thermal Science and Engineering Applications 2, no. 1 (2010). http://dx.doi.org/10.1115/1.4001986.

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Underwater workers, sport and military divers, are exposed to thermal stress since most of the waters of the world are below or above what is thermally neutral. Although divers wear insulation suits for passive thermal protection they are inadequate. Active heating is currently accomplished by resistive heating and open-flow tubes delivering hot water; however, these methods are problematic. The challenge of this project was to design, build and test an active diver thermal protection system (DTPS) to be used with wet suit insulation that is effective, user-friendly, reliable, and that could b
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35

Kazakova, A. I., I. K. Garkushin, and I. G. Yakovlev. "Study of phase equilibria in the two-component organic system biphenyl – n-docosane." Расплавы, no. 2 (April 15, 2024). http://dx.doi.org/10.31857/s0235010624020031.

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The fusibility diagram of the diphenyl – n-docosane system was calculated by Schroeder, UNIFAC and UNIFAC Dortmund methods, and it was shown that it belongs to the eutectic type. Individual substances and their mixtures were studied experimentally using a differential scanning microcalorimeter. The endo-effect corresponding to the melting of the eutectic was noted on the DTA heating curve of the eutectic alloy. A comparison of the eutectic coordinates calculated by these methods with experimental data is presented. Specific fusion enthalpy, molar values of entropy and enthalpy of fusion, volum
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36

Sarkar, D., E. Savory, and C. DeGroot. "Thermodynamic modeling of thermosyphons and heat pipes." Physics of Fluids 35, no. 12 (2023). http://dx.doi.org/10.1063/5.0174160.

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A model capable of predicting the thermodynamic state of the working fluid and its related properties inside a thermosyphon and a heat pipe is proposed. The model theoretically analyzes the entropy changes of various thermodynamic processes and determines the possible locations of the state points on a temperature-specific entropy (T-s) and a specific enthalpy-specific entropy (h-s) diagram at each stage of the thermodynamic cycle. The analysis reveals that the working fluid enters the condenser in a superheated state, while it enters the evaporator in a subcooled state, irrespective of the op
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37

Puzdrowska, Patrycja. "Comparison of methods for diagnosing marine IC engines based on working medium parameters including exhaust gas specific enthalpy." Combustion Engines, November 6, 2024. http://dx.doi.org/10.19206/ce-195438.

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Article points out methods currently used to diagnose marine engines in operation. The development of tools and programs for implementing these methods was pointed out. The problem of unsatisfactory measurement susceptibility of marine engines was highlighted. Three methods of parametric diagnosis are presented: measurement of in-cylinder parameters and in exhaust gas duct, numerical simulation due to computer software and calculations based on Wibe function. Unfitness states that were analyzed during tests are presented: reduced injection pressure, obstructed intake air duct and reduced compr
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38

"PHASE EQUILIBRIUM STATES IN A TWO-COMPONENT DIPHENYL-n-NONADECANE SYSTEM." ChemChemTech 66, no. 6 (2023): 46–53. http://dx.doi.org/10.6060/ivkkt.20236606.6733.

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The melting curves of the diphenyl-n-nonadecane system were calculated using the Schroeder equation and using the UNIFAC and UNIFAC Dortmund methods. The calculation results showed that the diphenyl-n-nonadecane system is eutectic. The compositions experimentally studied by the method of differential thermal analysis and calculated by the indicated methods are not eutectic. Individual substances and 9 compositions within the studied system were experimentally studied using a differential scanning calorimeter. Based on the data obtained, a phase diagram was constructed, including one single-pha
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39

Uusitalo, Antti, Teemu Turunen-Saaresti, Juha Honkatukia, Piero Colonna, and Jaakko Larjola. "Siloxanes as Working Fluids for Mini-ORC Systems Based on High-Speed Turbogenerator Technology." Journal of Engineering for Gas Turbines and Power 135, no. 4 (2013). http://dx.doi.org/10.1115/1.4023115.

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This paper presents a study aimed at evaluating the use of siloxanes as the working fluid of a small-capacity (≈10kWe) ORC turbogenerator based on the “high-speed technology” concept, combining the turbine, the pump, and the electrical generator on one shaft, whereby the whole assembly is hermetically sealed, and the bearings are lubricated by the working fluid. The effects of adopting different siloxane working fluids on the thermodynamic cycle configuration, power output, and on the turbine and component design are studied by means of simulations. Toluene is included into the analysis as a r
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40

Rowshanaie, Omid, Mohd Zahirasri Mohd Tohir, Faizal Mustapha, Mohammad Effendy Ya’acob, and Hooman Rowshanaie. "Evaluation of Subcritical Organic Rankine Cycle by Pure and Zeotropic of Binary and Ternary Refrigerants." Pertanika Journal of Science and Technology 30, no. 4 (2022). http://dx.doi.org/10.47836/pjst.30.4.02.

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The simulation configuration and process analysis of the Subcritical Organic Rankine Cycle (SORC) system are carried out for the potential comparison between pure, binary, and ternary zeotropic mixtures of R1234ze(E), R1234yf, and R134a as refrigerant working fluids based on applying the flue gas as a heat source with medium temperature. The compression pressure was selected as an optimized variable input parameter of SORC with the lower limit of boundary condition (1.4 MPa); to mitigate air ingress and sub-atmospheric pressure that led to approach optimum net power output generated. Increasin
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41

Garibaldi, Pietro, and Mario Misale. "Experiments in Single-Phase Natural Circulation Miniloops With Different Working Fluids and Geometries." Journal of Heat Transfer 130, no. 10 (2008). http://dx.doi.org/10.1115/1.2948393.

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The aim of this work is to analyze experimentally the influence of geometrical parameters and fluid properties on the thermal performances of rectangular single-phase natural circulation miniloops, which could be used for cooling of electronic devices. The present paper analyzes two experimental campaigns performed on two rectangular miniloops (ML1 and ML2), characterized by different heights, when two working fluids (water and FC43) are employed. The temperature trends are measured for different combinations of miniloop inclination and power, and the associated fluid velocities are calculated
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42

Sarode, Chandrakant, Sachin Yeole, Ganesh Chaudhari, Govinda Waghulde, and Gaurav Gupta. "Development of the room temperature protocol based on room temperature ionic liquids and surfactant ionic liquids for the synthesis of derivatives of 2-amino-thiazoles and thermo-physical analysis of the synthesized derivatives using TGA-DSC." Current Physical Chemistry 10 (May 19, 2020). http://dx.doi.org/10.2174/1877946810999200519102040.

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Aims: To develop an efficient protocol, which involves an elegant exploration of the catalytic potential of both the room temperature and surfactant ionic liquids towards the synthesis of biologically important derivatives of 2-aminothiazole. Objective: Specific heat capacity data as a function of temperature for the synthesized 2- aminothiazole derivatives has been advanced by exploring their thermal profiles. Method: The thermal gravimetry analysis and differential scanning calorimetry techniques are used systematically. Results: The present strategy could prove to be a useful general strate
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43

Mauer, Georg. "How Hydrogen Admixture Changes Plasma Jet Characteristics in Spray Processes at Low Pressure." Plasma Chemistry and Plasma Processing, December 1, 2020. http://dx.doi.org/10.1007/s11090-020-10143-6.

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AbstractIn plasma spraying, hydrogen is widely used as a secondary working gas besides argon. In particular under low pressure, there are strong effects on the plasma jet characteristics even by small hydrogen percentages. Under such conditions, fundamental mechanisms like diffusion and recombination are affected while this is less relevant under atmospheric conditions. This was investigated for argon–hydrogen mixtures by optical emission spectroscopy (OES). The small electron densities under the investigated low pressure conditions implied specific difficulties in the application of several O
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44

Hu, Ya-Hao, Su-Rong Sun, Xian Meng, He-Ji Huang, and Hai-Xing Wang. "Experimental study on the life and performance of an improved DC arc plasma torch." Journal of Physics D: Applied Physics, February 2, 2024. http://dx.doi.org/10.1088/1361-6463/ad256b.

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Abstract A novel DC arc plasma torch is designed in this paper in order to reduce the electrode erosion, and a series of experiments are carried out to investigate how to improve the lifetime and performance of the nitrogen DC arc plasma torch. The analysis of voltage characteristics of the plasma torch indicates that the interelectrode insert can increase the average arc voltage and the sudden expansion structure can reduce the voltage fluctuation, which is helpful to improve the working stability to some extent. The spectrum characteristics at the plasma torch outlet and the cold flow simula
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45

Hofmann, Mathias, and George Tsatsaronis. "Exergy-Based Study of a Binary Rankine Cycle." Journal of Energy Resources Technology 138, no. 6 (2016). http://dx.doi.org/10.1115/1.4033303.

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The aim of this work is to study a binary Rankine process with a significantly higher efficiency compared to a conventional coal-fired power plant. This paper focuses on the design of the process and especially on an efficient combination of flue gas, potassium, and water streams in the components of the steam generator, such as economizers, evaporators, and superheaters, to decrease the overall exergy destruction. Based on a literature review, a base case for a coal-fired binary Rankine cycle with potassium and water as working fluids was developed and, in order to evaluate the thermodynamic
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46

Harinck, John, Teemu Turunen-Saaresti, Piero Colonna, Stefano Rebay, and Jos van Buijtenen. "Computational Study of a High-Expansion Ratio Radial Organic Rankine Cycle Turbine Stator." Journal of Engineering for Gas Turbines and Power 132, no. 5 (2010). http://dx.doi.org/10.1115/1.3204505.

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There is a growing interest in organic Rankine cycle (ORC) turbogenerators because they are suitable as sustainable energy converters. ORC turbogenerators can efficiently utilize external heat sources at low to medium temperature in the small to medium power range. ORC turbines typically operate at very high pressure ratio and expand the organic working fluid in the dense-gas thermodynamic region, thus requiring computational fluid dynamics (CFD) solvers coupled with accurate thermodynamic models for their performance assessment and design. This article presents a comparative numerical study o
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