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Journal articles on the topic 'Rankin cycle'

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Published: 30 May 2022

Last updated: 31 May 2022

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1

ISSHIKI, Naotsugu, Hiroshi KOJIMA, Izumi USHIYAMA, and Seita ISSHIKI. "Development of Steam Rankin Stirling Cycle Engine (SRSE)." Proceedings of the Symposium on Stirlling Cycle 2000.4 (2000): 59–62. http://dx.doi.org/10.1299/jsmessc.2000.4.59.

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2

Sultan, Dr Fawaz. "Performance Analysis of Steam Power Plants Using Ideal Reheat-Rankin Cycle." International Journal of Advanced engineering, Management and Science 3, no. 4 (2017): 305–12. http://dx.doi.org/10.24001/ijaems.3.4.4.

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3

Набокин, A. Nabokin, Новиков, and A. Novikov. "FOREIGN EXPERIENCE OF IMPLEMENTATION CYCLE CARNOT IN AUTOMOTIVE PISTON POWER PLANTS." Alternative energy sources in the transport-technological complex: problems and prospects of rational use of 3, no. 1 (March 16, 2016): 26–30. http://dx.doi.org/10.12737/18623.

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The article outlines the basic concepts of thermodynamic improvement of technical facilities for automobile transport. Reviewed the cycles of Rankin, Stirling, Edwards as the most applicable for the use of alternative energy sources.

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4

Bo, Dakkah Baydaa, I′ldar A. Sultanguzin, and Yuriy V. Yavorovsky. "Heat Recovery Using Organic Rankine Cycle." Vestnik MEI, no. 5 (2021): 51–57. http://dx.doi.org/10.24160/1993-6982-2021-5-51-57.

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Heat losses in industrial processes can be divided into three sections (high-, medium-, and low-temperature heat), depending on the temperature of the exhaust gases. This heat is usually recovered either by heat exchangers or by a closed Rankine cycle. However, about 60% of low-temperature heat losses remain irreplaceable. Currently, the organic Rankine cycle has become a promising method of low-temperature energy recovery, and several theoretical studies on this topic have appeared, but a small number of experimental studies have been performed. In our work, we have built a 2 kW heat recovery laboratory test bench using tube-type heat exchangers, a gear pump and a turbo expander on the working fluid R141b. As a result, we found that the efficiency of the cycle increases as the boiling point and pressure increase, but an increase in overheating at the inlet of the expander leads to a decrease in efficiency due to the use of the working fluid R141b. At the inlet of the evaporator and the outlet of the condenser, respectively, overheating and supercooling of the working fluid occurs, which negatively affects the efficiency of the cycle. The amount of useful heat obtained was 45.4 W with an efficiency of 2.24%. as a result of low efficiency of the expander and pump, as well as leaks during the test. The development of an experimental test bench with working on organic Rankin cycle requires long-term research work and great scientific potential. In the future, it will be necessary to create a new test bench based on a deeper study, so that we can get a higher efficiency of the expander and pump, which would affect the efficiency of this cycle. Also, we need to replace the working fluid in the cycle with a more efficient one.

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5

ISSHIKI, Naotsugu, Hiroshi KOJIMA, and Seita ISSHIKI. "A09 Development of Rankin Stirling Cycle Engine (SRSE) Utilizing wooden Pellets as Fuel." Proceedings of the Symposium on Stirlling Cycle 2001.5 (2001): 27–30. http://dx.doi.org/10.1299/jsmessc.2001.5.27.

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6

Ćehajić, Nurdin, and Sandira Eljšan. "Exergy analysis of sub-critical organic Rankin cycle for the energy utilization of biomass." Tehnika 73, no. 3 (2018): 373–80. http://dx.doi.org/10.5937/tehnika1803373c.

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7

Bai, Jie, Leilei Cao, and Lulu Cao. "System design and analysis on organic Rankin cycle for asphalt plant’s waste heat recovery." IOP Conference Series: Earth and Environmental Science 358 (December 13, 2019): 052067. http://dx.doi.org/10.1088/1755-1315/358/5/052067.

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8

Al-Furaiji, Mushtaq A., Fawzi Sh Alnasur, Hayder salah AL sammarraie, and Muhammed Im Kareem. "Regeneration equations for the Rankine cycle with super-heated steam." IOP Conference Series: Earth and Environmental Science 1029, no. 1 (May 1, 2022): 012015. http://dx.doi.org/10.1088/1755-1315/1029/1/012015.

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Abstract The paper presents a mathematical model to calculate the thermal efficiency of the steam turbines with superheating, methodology forecasting for the Rankin cycle with superheated steam using Regression equations, MathCad, SPSS, and Statistatica programs. The resulting regression equation is applied to calculate the indicator values in a given range of variation of parameters, and it is also limitedly suitable for calculation outside this range. A MathCad-based approach for calculating the predictive model was created and presented. This work presents the formulation of a problem for the method of experiment planning. A turbine unit with three input parameters that influence the value of the output parameter Y (the thermal efficiency of the Steam turbine unit) was studied through the method of experiment planning. Along with that, the first parameter (initial pressure turbine, bar) varied within: 100< x1 <128; the second parameter (the turbine-inlet temperature, °C) varied within: 450 < X2 < 550; the third parameter (the fraction of dryness) varied within: 0.79 < X3 < 0.83.

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9

YOKOYAMA, Tomoyuki, Tomohiko YAMAGUCHI, Souichi SASAKI, Hidejiro MORITAKA, Kuniyasu KANEMARU, and Satoru MOMOKI. "624 Feasibility Study of Super Critical CO2 Rankin Cycle Driven by Heat Source of a Hot Spring." Proceedings of Conference of Kyushu Branch 2015.68 (2015): 257–58. http://dx.doi.org/10.1299/jsmekyushu.2015.68.257.

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10

HORINO, Takashi, Chayadit PUMANERATKUL, Kyosuke FUJITA, Haruhiko YAMASAKI, and Hiroshi YAMAGUCHI. "Performance and Flow Characteristics of Thermally Driven Pump in CO₂ Solar Rankin Cycle System." Proceedings of Mechanical Engineering Congress, Japan 2017 (2017): S0510102. http://dx.doi.org/10.1299/jsmemecj.2017.s0510102.

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11

Bacenetti, Jacopo, Alessandra Fusi, and Adisa Azapagic. "Environmental sustainability of integrating the organic Rankin cycle with anaerobic digestion and combined heat and power generation." Science of The Total Environment 658 (March 2019): 684–96. http://dx.doi.org/10.1016/j.scitotenv.2018.12.190.

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12

Alibaba, Massomeh, Razieh Pourdarbani, Mohammad Hasan Khoshgoftar Manesh, Israel Herrera-Miranda, Iván Gallardo-Bernal, and José Luis Hernández-Hernández. "Conventional and Advanced Exergy-Based Analysis of Hybrid Geothermal–Solar Power Plant Based on ORC Cycle." Applied Sciences 10, no. 15 (July 28, 2020): 5206. http://dx.doi.org/10.3390/app10155206.

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Today, as fossil fuels are depleted, renewable energy must be used to meet the needs of human beings. One of the renewable energy sources is undoubtedly the solar–geothermal power plant. In this paper, the conventional and advanced, exergo-environmental and exergo-economic analysis of a geothermal–solar hybrid power plant (SGHPP) based on an organic Rankin cycle (ORC) cycle is investigated. In this regard, at first, a conventional analysis was conducted on a standalone geothermal cycle (first mode), as well as a hybrid solar–geothermal cycle (second mode). The results of exergy destruction for simulating the standalone geothermal cycle showed that the ORC turbine with 1050 kW had the highest exergy destruction that was 38% of the total share of destruction. Then, the ORC condenser with 26% of the total share of exergy destruction was in second place. In the hybrid geothermal–solar cycle, the solar panel had the highest environmental impact and about 56% of the total share of exergy destruction. The ORC turbine had about 9% of all exergy destruction. The results of the advanced analysis of exergy in the standalone geothermal cycle showed that the avoidable exergy destruction of the condenser was the highest. In the hybrid geothermal–solar cycle, the solar panel, steam economizer and steam evaporator were ranked first to third from an avoidable exergy destruction perspective. The avoidable exergo-economic destruction of the evaporator and pump were higher than the other components. The hybrid geothermal–solar cycle, steam economizer, solar pane and steam evaporator were ranked first to third, respectively, and they could be modified. The avoidable exergo-environmental destruction of the ORC turbine and the ORC pump were the highest, respectively. In the hybrid geothermal–solar cycle, steam economizers, solar panel and steam evaporators had the highest avoidable exergy destruction, respectively. For the standalone geothermal cycle, the total endogenous exergy destruction and exogenous exergy destruction was 83.61% and 16.39%. Moreover, from an exergo-economic perspective, 89% of the total destruction rate was endogenous and 11% was exogenous. From an exergo-environmental perspective, 88.73% of the destruction rate was endogenous and 11.27% was exogenous. For the hybrid geothermal–solar cycle, the total endogenous and exogenous exergy destruction was 75.08% and 24.92%, respectively. Moreover, 81.82% of the exergo-economic destruction rate was endogenous and 18.82% was exogenous. From an exergo-environmental perspective, 81.19% of the exergy destruction was endogenous and 18.81% was exogenous.

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13

Kopsen, E., and G. McGann. "A REVIEW OF THE HYDROCARBON HABITAT OF THE EASTERN AND CENTRAL BARROW — DAMPIER SUB-BASIN, WESTERN AUSTRALIA." APPEA Journal 25, no. 1 (1985): 154. http://dx.doi.org/10.1071/aj84015.

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The most completely known section of the Barrow- Dampier Sub-basin in the northern Carnarvon Basin of the Northwest Shelf comprises three depositional super- cycles spanning the Triassic to the Tertiary. Each cycle is made up of an initial transgressive section of mainly fine-grained clastics overlain by a thick, extensive, off- lapping sequence of coarse-grained deposits. The transgressive sedimentary package typically contains a coarse basal unit overlain by a thick, argillaceous unit, whereas the progradational package changes character in each cycle, representing increasingly open marine conditions as the depocentre and its palaeogeography evolved. Continental siliciciastics at the end of the Triassic Supercycle contrast with the marine-marginal marine siliciciastics at the end of the Jurassic-Neocomian Supercycle and the prograding Tertiary carbonate wedge of the youngest cycle. Each of these gross sequences has a distinctive seismic signature upon which are superimposed stratigraphic features reflecting basin evolution from a broad intra-continental depocentre to a mature, passive continental margin basin.In the area east of Barrow Island, potential hydrocarbon source rock quality and richness varies between each cycle but potential source beds frequently occur at similar levels within each supercycle. The Dingo Claystone within the Jurassic-Neocomian depositional package contains by far the thickest and most extensive potential sources in the area and is likely to be the source for most of the hydrocarbon liquids discovered to date in the northern Carnarvon Basin (with the probable exclusion of the majority of the Rankin Platform condensates).The occurrence of oils of mixed composition and considerable variability beneath the Muderong Shale regional seal in areas of low thermal maturity suggests that many of the hydrocarbon liquids have undergone considerable vertical migration and have also a complex genesis. Furthermore, saturate-rich liquid hydrocarbons overprinting an older biodegraded oil are recognised in a number of wells along the basin margin hingeline. The likely migration and entrapment model for the majority of hydrocarbons discovered to date in the area under review involves dynamic charging of reservoirs, mainly during the Tertiary. Two main pulses of generation and migration are recognised in the eastern portion of the sub -basin, and a third phase is probably occuring at present-day, west of Barrow Island.

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14

Ravikumar Solomon, G., R. Balaji, K. Ilayaperumal, and B. Chellappa. "Performance analysis and efficiency enhancement of cooling tower in 210 MW thermal unit." Journal of Physics: Conference Series 2054, no. 1 (October 1, 2021): 012062. http://dx.doi.org/10.1088/1742-6596/2054/1/012062.

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Abstract Heat exchangers, condensers plays a vital role in any kind of power cycle like modified Rankin cycle, these components involves transfer of both sensible and latent heat and have great influence over the power plant performance. The condenser employed in MTPS involves transfer of latent heat into steam. Yet it as to induce a phase change in thereby forming water. Increase in the effectiveness of condenser resulted in the increase of vacuum in the condenser. Thereby work done by steam is increased and coal saving (per ton of steam production) is achieved. This condensation process results in the formation of sludge’s (temporary) and (permanent). Along the inner periphery of the condenser tubes. These permanent scales have decreased thermal conductivity and inhibit the heat transfer rate. The more the thickness of the scale the less the heat is removed from the steam. This scale formation limits the life of the condenser tubes with maximum performance. In this project the thickness of the scale formed in the condenser tubes is calculated theoretically and the performance is analysed before and after scale formation in the condenser. Different materials which involve less scale formation, different ways of reducing scales and various scale removing methods are suggested.

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15

da Rosa Pinheiro, Douglas Rafael, Maria Eduarda Parcianello Cabeleira, Luigi Antonio da Campo, Laís Andrielli Ferreira Gattino, Kellen Sábio de Souza, Laura dos Santos Burg, Ariane Haydeé Estrada Gamarra Blauth, Philipe Souza Corrêa, and Fernanda Cechetti. "Upper limbs cycle ergometer increases muscle strength, trunk control and independence of acute stroke subjects: A randomized clinical trial." NeuroRehabilitation 48, no. 4 (June 16, 2021): 533–42. http://dx.doi.org/10.3233/nre-210022.

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BACKGROUND: Studies demonstrate the benefits of upper limbs cycle ergometer (ULCE) in subacute and chronic stroke subjects, but the literature still needs to explore the acute phase of the disease. OBJECTIVE: Verify the effects of ULCE on muscular strength, trunk control and independence of post-stroke subjects in hospital acute phase. METHODS: In this randomized clinical trial participants were allocated into two groups. The control group (CG) performed two daily sessions of conventional physiotherapy, while the intervention group (IG) had one daily session of conventional physiotherapy and one of ULCE. The interventions were carried out for 20 minutes for five days. Both groups were assessed before and after the treatment for upper limbs strength by manual dynamometer, trunk control by Trunk Impairment Scale and level of independence by the Modified Rankin Scale. RESULTS: Twenty subjects with mean ages of 63.5±4.5 were enrolled. There was a significant intra-group difference of palmar grip, shoulder abductors, elbow flexor and wrist extensor strength, trunk control and functional independence only in IG. Inter-group difference for all variables showed superiority in IG. CONCLUSIONS: ULCE is an effective device for increasing muscle strength, trunk control and consequently improving the independence of post-stroke subjects in the acute hospital phase.

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16

Colonna, Piero, Emiliano Casati, Carsten Trapp, Tiemo Mathijssen, Jaakko Larjola, Teemu Turunen-Saaresti, and Antti Uusitalo. "Organic Rankine Cycle Power Systems : A Review." Proceedings of the International Conference on Power Engineering (ICOPE) 2015.12 (2015): E1—E20. http://dx.doi.org/10.1299/jsmeicope.2015.12.e1.

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17

Beans, E. W. "Comparative Thermodynamics for Brayton and Rankine Cycles." Journal of Engineering for Gas Turbines and Power 112, no. 1 (January 1, 1990): 94–99. http://dx.doi.org/10.1115/1.2906483.

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The thermal efficiency, work per unit mass, and work per unit volume of the simple Rankine and Brayton cycles are expressed in terms of seven independent variables using a simplified thermodynamic model. By requiring equal efficiency, equal work conditions, and the same maximum cycle temperature for both cycles, two necessary relationships are established between the seven independent variables. These two relationships along with two maximum work conditions produce a method for comparing required and selected properties. These comparisons provide useful guidelines for the selection of the cycle and cycle fluids. The comparison analysis shows that for a given application the more attractive cycle is strongly dependent upon the fluids selected.

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18

Erdogan, Anil, and Ozgur Colpan. "Performance assessment of shell and tube heat exchanger based subcritical and supercritical organic Rankine cycles." Thermal Science 22, Suppl. 3 (2018): 855–66. http://dx.doi.org/10.2298/tsci171101019e.

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In this study, thermal models for subcritical and supercritical geothermal powered organic Rankine cycles are developed to compare the performance of these cycle configurations. Both of these models consist of a detailed model for the shell and tube heat exchanger integrating the geothermal and organic Rankine cycles sides and basic thermodynamic models for the rest of the components of the cycle. In the modeling of the heat exchanger, this component was divided into sever?al zones and the outlet conditions of each zone were found applying logarithmic mean temperature difference method. Different Nusselt correlations according to the relevant phase (single, two-phase, and supercritical) were also included in this model. Using the system-level model, the effect of the source temperature on the performances of the heat exchanger and the organic Rankine cycle was assessed. These performance parameters are heat transfer surface area and pressure drop of tube side fluid for the heat exchanger, and electrical and exergetic efficiencies of the integrated organic Rankine cycles system. It was found that 44.12% more net power is generated when the supercritical organic Rankine cycle is used compared to subcritical organic Rankine cycle.

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19

Woodward, John B. "The Rankine Topping Cycle Revisited." Journal of Ship Research 36, no. 01 (March 1, 1992): 91–98. http://dx.doi.org/10.5957/jsr.1992.36.1.91.

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Cascaded thermodynamic machines are familiar in marine engineering, even if the word "cascade" is not common currency in that field. The author refers to the almost universal practice of exhausting the working fluid (air) of a diesel engine into a gas turbine (the turbocharger, usually), followed by exhausting of that working fluid into a heat exchanger that energizes the working fluid (water) of yet another turbine. If the same practice is to be described in terms of the respective power cycles, we would probably say that the cascade consists of a Rankine cycle topped by a Brayton cycle which is in turn topped by a diesel cycle. In similar fashion, recognized nomenclature might describe the diesel component as the "topping cycle," and the Rankine as the "bottoming cycle." The topping/bottoming nomenclature usually implies two different working fluids, so that the Brayton cycle might be described as a subpart of the topping cycle.

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20

Ibrahim, O. M., and S. A. Klein. "High-Power Multi-Stage Rankine Cycles." Journal of Energy Resources Technology 117, no. 3 (September 1, 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 provides a useful tool for studying power cycles and forms the basis for making design improvements.

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21

Mahmoudi, S. M. S., and A. R. Ghavimi. "Thermoeconomic analysis and multi objective optimization of a molten carbonate fuel cell – Supercritical carbon dioxide – Organic Rankin cycle integrated power system using liquefied natural gas as heat sink." Applied Thermal Engineering 107 (August 2016): 1219–32. http://dx.doi.org/10.1016/j.applthermaleng.2016.07.003.

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22

Ahmed, Aram Mohammed, László Kondor, and Attila R. Imre. "Thermodynamic Efficiency Maximum of Simple Organic Rankine Cycles." Energies 14, no. 2 (January 8, 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 paper, we would like to show that for an ideal, simple-layout ORC system, a thermodynamic efficiency-maximum can also exist. It means that for several working fluids, the thermodynamic efficiency vs. maximal cycle temperature function has a maximum, located in the sub-critical temperature range. A proof will be given by comparing ORC efficiencies with TFC (Trilateral Flash Cycle) efficiencies; for wet working fluids, further theoretical evidence can be given. The group of working fluids with this kind of maximum will be defined. Generalization for normal (steam) Rankine cycles and CO2 subcritical Rankine cycles will also be shown. Based on these results, one can conclude that the increase of the maximal cycle temperature is not always a useful tool for efficiency-increase; this result can be especially important for hybrid systems.

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23

Ahmed, Aram Mohammed, László Kondor, and Attila R. Imre. "Thermodynamic Efficiency Maximum of Simple Organic Rankine Cycles." Energies 14, no. 2 (January 8, 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 paper, we would like to show that for an ideal, simple-layout ORC system, a thermodynamic efficiency-maximum can also exist. It means that for several working fluids, the thermodynamic efficiency vs. maximal cycle temperature function has a maximum, located in the sub-critical temperature range. A proof will be given by comparing ORC efficiencies with TFC (Trilateral Flash Cycle) efficiencies; for wet working fluids, further theoretical evidence can be given. The group of working fluids with this kind of maximum will be defined. Generalization for normal (steam) Rankine cycles and CO2 subcritical Rankine cycles will also be shown. Based on these results, one can conclude that the increase of the maximal cycle temperature is not always a useful tool for efficiency-increase; this result can be especially important for hybrid systems.

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24

van Nuland, J., and J. Renet. "Organic rankine cycle." Computers & Chemical Engineering 11, no. 5 (October 1987): 547–51. http://dx.doi.org/10.1016/0098-1354(87)80030-3.

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25

Sun, Heng, Hong Mei Zhu, and Hong Wei Liu. "Process Simulations of the Cold Recovery Unit in a LNG CCHP System with Different Power Cycles." Applied Mechanics and Materials 90-93 (September 2011): 3026–32. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.3026.

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A CCHP system using LNG as the primary energy should integrate cold recovery unit to increase the total energy efficiency. A scheme of CCHP consisting of gas turbine-steam turbine combined cycle, absorption refrigeration unit, cold recovery unit and cooling media system is a system with high efficiency and operation flexibility. Three different power cycles using the cold energy of LNG is(are 或 were) presented and simulated. The results show that the cascade Rankine power cycle using ethylene and propane in the two cycles respectively has highest energy efficiency. However, the unit is most complex. The efficiency of ethylene Rankine power cycle is little lower than the cascade one, and is much higher than the traditional propane Rankine cycle. The complexity of ethylene cycle is identical to that of the propane cycle. The ethylene Rankine power cycle is the referred method of cold recovery in a CCHP system based on overall considerations.

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26

Zeinodini, Mohammadreza, and Mehdi Aliehyaei. "Energy, exergy, and economic analysis of a new triple-cycle power generation configuration and selection of the optimal working fluid." Mechanics & Industry 20, no. 5 (2019): 501. http://dx.doi.org/10.1051/meca/2019021.

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The present study investigated energy, exergy and economic analyses on a new triple-cycle power generation configuration. In this configuration, the energy of the exhaust gas and the wasted energy in the condenser of the steam cycle is recovered in the heat recovery steam generator (HRSG) and the evaporator of organic Rankine cycle (ORC), respectively. A computer code was written in MATLAB to analyze the triple-cycle configuration. Validation through this program showed that the highest errors were 5.6 and 7.1%, which occurred in gas and steam cycles, respectively. The results revealed that the highest generated entropy was associated with the combustion chamber and the evaporator in the steam cycle. The first and second laws of thermodynamics efficiencies were improved by roughly 270 and 8%, respectively, through adding each of the steam and organic Rankine cycles. The entropy generated by the cycle increased by roughly 400 and 4% by adding the steam and organic Rankine cycles, respectively. The price of the produced electricity was also reduced by roughly 60 and 70%, respectively, for these two cycles.

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27

Santos, J. T. dos, T. M. Fagundes, E. D. dos Santos, L. A. Isoldi, and L. A. O. Rocha. "ANALYSIS OF A COMBINED BRAYTON/RANKINE CYCLE WITH TWO REGENERATORS IN PARALLEL." Revista de Engenharia Térmica 16, no. 2 (December 31, 2017): 10. http://dx.doi.org/10.5380/reterm.v16i2.62205.

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This work presents a configuration of two regenerators in parallel for a power generation Brayton/Rankine cycle where the output power is 10 MW. The working fluids considered for the Brayton and Rankine cycles are air and water, respectively. The addition of a regenerator with the previous existing cycle of this kind resulted in the addition of a second-stage turbine in the Rankine cycle of reheat. The objective of this modification is to increase the thermal efficiency of the combined cycle. In order to examine the efficiency of the new configuration, it is performed a thermodynamic modelling and numerical simulations for both cases: a regular Brayton/Rankine cycle and the one with the proposed changes. At the end of the simulations, the two cycles are compared, and it is seen that the new configuration reaches a 0.9% higher efficiency. In addition, the vapor quality at the exit of the higher turbine is higher, reducing the required mass flow rate in 14%.

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28

Lee, Su Won, Jin Gyu Kwon, Moo Hwan Kim, and HangJin Jo. "Cycle analysis and economic evaluation for seawater-LNG Organic Rankine Cycles." Energy 234 (November 2021): 121259. http://dx.doi.org/10.1016/j.energy.2021.121259.

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29

Mikielewicz, Dariusz, Jan Wajs, and Elżbieta Żmuda. "Organic Rankine Cycle as Bottoming Cycle to a Combined Brayton and Clausius - Rankine Cycle." Key Engineering Materials 597 (December 2013): 87–98. http://dx.doi.org/10.4028/www.scientific.net/kem.597.87.

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A preliminary evaluation has been made of a possibility of bottoming of a conventional Brayton cycle cooperating with the CHP power plant with the organic Rankine cycle installation. Such solution contributes to the possibility of annual operation of that power plant, except of operation only in periods when there is a demand for the heat. Additional benefit would be the fact that an optimized backpressure steam cycle has the advantage of a smaller pressure ratio and therefore a less complex turbine design with smaller final diameter. In addition, a lower superheating temperature is required compared to a condensing steam cycle with the same evaporation pressure. Bottoming ORCs have previously been considered by Chacartegui et al. for combined cycle power plants [ Their main conclusion was that challenges are for the development of this technology in medium and large scale power generation are the development of reliable axial vapour turbines for organic fluids. Another study was made by Angelino et al. to improve the performance of steam power stations [. This paper presents an enhanced approach, as it will be considered here that the ORC installation could be extra-heated with the bleed steam, a concept presented by the authors in [. In such way the efficiency of the bottoming cycle can be increased and an amount of electricity generated increases. A thermodynamic analysis and a comparative study of the cycle efficiency for a simplified steam cycle cooperating with ORC cycle will be presented. The most commonly used organic fluids will be considered, namely R245fa, R134a, toluene, and 2 silicone oils (MM and MDM). Working fluid selection and its application area is being discussed based on fluid properties. The thermal efficiency is mainly determined by the temperature level of the heat source and the condenser conditions. The influence of several process parameters such as turbine inlet and condenser temperature, turbine isentropic efficiency, vapour quality and pressure, use of a regenerator (ORC) will be presented. Finally, some general and economic considerations related to the choice between a steam cycle and ORC are discussed.

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30

Noroozian, Afsaneh, Abbas Naeimi, Mokhtar Bidi, and Mohammad Hossein Ahmadi. "Exergoeconomic comparison and optimization of organic Rankine cycle, trilateral Rankine cycle and transcritical carbon dioxide cycle for heat recovery of low-temperature geothermal water." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, no. 8 (April 18, 2019): 1068–84. http://dx.doi.org/10.1177/0957650919844647.

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Depleting fossil fuel resources and the horrible environmental impacts due to burning fossil fuels emphasize the importance of using renewable energy resources such as geothermal and solar energies. This paper compares performance of CO2 transcritical cycle, organic Rankine cycle, and trilateral Rankine cycle using a low-temperature geothermal heat source. Thermodynamic analysis, exergetic analysis, economic analysis, and exergoeconomic analysis are applied for each of the aforementioned cycles. In addition, a sensitivity analysis is performed on the system, and the effects of geothermal heat source temperature, evaporator pinch point temperature, and turbine inlet pressure on the cycle's performance are evaluated. Finally, the systems are optimized in order to minimize product cost ratio and maximize exergetic efficiency by using the genetic algorithm. Results indicate that the maximum thermal efficiency is approximately 13.03% which belongs to organic Rankine cycle with R123 as working fluid. CO2 cycle has the maximum exergetic efficiency, equals to 46.13%. The minimum product cost ratio refers to the organic Rankine cycle with R245fa as working fluid. Moreover, sensitivity analysis shows that increasing geothermal heat source temperature results in higher output power, product cost ratio, and exergy destruction ratio in all cycles.

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Hung, T. C. "Triple Cycle: A Conceptual Arrangement of Multiple Cycle Toward Optimal Energy Conversion." Journal of Engineering for Gas Turbines and Power 124, no. 2 (March 26, 2002): 429–36. http://dx.doi.org/10.1115/1.1423639.

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The purpose of this study is to find a maximum work output from various combinations of thermodynamic cycles from a viewpoint of the cycle systems. Three systems were discussed in this study: a fundamental combined cycle and two other cycles evolved from the fundamental dual combined cycle: series-type and parallel-type triple cycles. In each system, parametric studies were carried out in order to find optimal configurations of the cycle combinations based on the influences of tested parameters on the systems. The study shows that the series-type triple cycle exhibits no significant difference as compared with the combined cycle. On the other hand, the efficiency of the parallel-type triple cycle can be raised, especially in the application of recovering low-enthalpy-content waste heat. Therefore, by properly combining with a steam Rankine cycle, the organic Rankine cycle is expected to efficiently utilize residual yet available energy to an optimal extent. The present study has pointed out a conceptual design in multiple-cycle energy conversion systems.

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32

Frase, Sibylle, Sandra Kaiser, Matti Steimer, Lisa Selzner, Niels Alexander Foit, Wolf-Dirk Niesen, and Nils Schallner. "Patients with Subarachnoid Hemorrhage Exhibit Disturbed Expression Patterns of the Circadian Rhythm Gene Period-2." Life 11, no. 2 (February 5, 2021): 124. http://dx.doi.org/10.3390/life11020124.

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Circadian rhythm gene expression in cerebral pacemaker regions is regulated by a transcriptional-translational feedback loop across the 24-h day-night cycle. In preclinical models of subarachnoid hemorrhage (SAH), cyclic gene expression is disrupted. Stabilization of circadian rhythm gene expression attenuates susceptibility to ischemic damage in both neuronal and myocardial tissues. In this clinical observational study, circadian rhythm gene Period-2 (Per2) mRNA expression levels were determined from blood leukocytes and cerebrospinal fluid (CSF) cells via real-time PCR on days 1, 7 and 14 after aneurysm rupture in 49 patients with spontaneous SAH. CSF Per2 expression was markedly suppressed immediately after SAH and remained suppressed over the course of two weeks of ICU treatment. Short-term mortality as well as occurrence of delirium was associated with greater extent of Per2 suppression on day 1 after SAH. Patients that developed delayed cerebral ischemia exhibited comparatively lower Per2 expression levels on day 7 after SAH, while presence of vasospasm remained unaffected. However, Per2 expression did not differ in patient groups with favourable or non-favourable functional neurological outcome (modified Rankin Scales 1–3 vs. 4–6). While our findings suggest a potential protective effect of stable circadian rhythm gene expression on the extent of ischemic damage, this effect was confined to the early disease course and was not reflected in patients’ functional neurological outcome.

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33

Daniarta, Sindu, Piotr Kolasiński, and Attila R. Imre. "Thermodynamic efficiency of trilateral flash cycle, organic Rankine cycle and partially evaporated organic Rankine cycle." Energy Conversion and Management 249 (December 2021): 114731. http://dx.doi.org/10.1016/j.enconman.2021.114731.

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34

Hung, Tzu-Chen, and Yong-Qiang Feng. "Innovative Research in the Organic Rankine Cycle." Impact 2020, no. 6 (November 16, 2020): 76–78. http://dx.doi.org/10.21820/23987073.2020.6.76.

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Thermodynamic cycles consist of a sequence of thermodynamic processes involving the transfer of heat and work into and then out of a system. Variables, such as pressure and temperature, eventually return the system to its initial state. During the process of passing through the system, the working fluid converts heat and disposes of any remaining heat, making the cycle act as a heat engine, where heat or thermal energy is converted into mechanical energy. Thermodynamic cycles are an efficient means of producing energy and one of the most well-known examples is a Rankine cycle. From there, scientists have developed the organic Rankine cycle (ORC), which uses fluid with a liquid to vapour phase change that occurs at a lower temperature than the water to steam phase change. Dr Tzu-Chen Hung and Dr Yong-Qiang Feng, who are based at both the Department of Mechanical Engineering, National Taipei University in Taiwan, and the School of Energy and Power Engineering, Jiangsu University in China, are carrying out work that seeks to design and build improved ORC systems which can be used for low-grade heat to power conversion.

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35

Schoenmaker, J., J. F. Q. Rey, and K. R. Pirota. "Buoyancy organic Rankine cycle." Renewable Energy 36, no. 3 (March 2011): 999–1002. http://dx.doi.org/10.1016/j.renene.2010.09.014.

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36

KIM, KYOUNG HOON, and MAN-HOE KIM. "Comparative Thermodynamic Analysis of Organic Rankine Cycle and Ammonia-Water Rankine Cycle." Transactions of the Korean hydrogen and new energy society 27, no. 5 (October 30, 2016): 597–603. http://dx.doi.org/10.7316/khnes.2016.27.5.597.

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37

Woodward, John B. "Ideal Cycle Evaluation of Steam Augmented Gas Turbines." Journal of Ship Research 40, no. 01 (March 1, 1996): 79–88. http://dx.doi.org/10.5957/jsr.1996.40.1.79.

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A wide range of air-standard Brayton and modified-Brayton power cycles are evaluated to determine their second-law efficiencies and their volume flows per unit output. A cycle with reheating is chosen for further analysis on the basis of its potential for high efficiency through exploitation of its exhaust availability (exergy) and its low volume rates. This exploitation can be had either through a conventional Rankine bottoming cycle, or through injection of the bottoming cycle steam into the Brayton turbine. The Rankine bottoming cycle is superior with respect to second-law efficiency; the cycle augmented by injected steam is superior with respect to volume flows. Examination of irreversibilities illuminates the reasons for the better efficiency of the Rankine bottoming cycle alternative.

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Aboelwafa, Omar, Seif-Eddeen K. Fateen, Ahmed Soliman, and Ibrahim M. Ismail. "A review on solar Rankine cycles: Working fluids, applications, and cycle modifications." Renewable and Sustainable Energy Reviews 82 (February 2018): 868–85. http://dx.doi.org/10.1016/j.rser.2017.09.097.

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39

PUMANERATKUL, Chayadit, Haruhiko YAMASAKI, and Hiroshi YAMAGUCHI. "Basic Flow on Thermally Driven Pump in Supercritical CO2 Solar Rankine Cycle System." Proceedings of Mechanical Engineering Congress, Japan 2016 (2016): S0510205. http://dx.doi.org/10.1299/jsmemecj.2016.s0510205.

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40

Kapooria, R. K., S. Kumar, and K. S. Kasana. "An analysis of a thermal power plant working on a Rankine cycle: A theoretical investigation." Journal of Energy in Southern Africa 19, no. 1 (February 1, 2008): 77–83. http://dx.doi.org/10.17159/2413-3051/2008/v19i1a3314.

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Today, most of the electricity produced throughout the world is from steam power plants. However, electricity is being produced by some other power generation sources such as hydropower, gas power, bio-gas power, solar cells, etc. One newly devel-oped method of electricity generation is the Magneto hydro dynamic power plant. This paper deals with steam cycles used in power plants. Thermodynamic analysis of the Rankine cycle has been undertaken to enhance the efficiency and reli-ability of steam power plants. The thermodynamic deviations resulting in non-ideal or irreversible func-tioning of various steam power plant components have been identified. A comparative study between the Carnot cycle and Rankine cycle efficiency has been analyzed resulting in the introduction of regen-eration in the Rankine cycle. Factors affecting effi-ciency of the Rankine cycle have been identified and analyzed for improved working of thermal power plants.

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Sen, Keya, Nancy A. Schable, and Dennis J. Lye. "Development of an Internal Control for Evaluation and Standardization of a Quantitative PCR Assay for Detection of Helicobacter pylori in Drinking Water." Applied and Environmental Microbiology 73, no. 22 (September 28, 2007): 7380–87. http://dx.doi.org/10.1128/aem.00687-07.

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ABSTRACT Due to metabolic and morphological changes that can prevent Helicobacter pylori cells in water from growing on conventional media, an H. pylori-specific TaqMan quantitative PCR (qPCR) assay was developed that uses a 6-carboxyfluorescein-labeled probe (A. E. McDaniels, L. Wymer, C. Rankin, and R. Haugland, Water Res. 39:4808-4816, 2005). However, proper internal controls are needed to provide an accurate estimate of low numbers of H. pylori in drinking water. In this study, the 135-bp amplicon described by McDaniels et al. was modified at the probe binding region, using PCR mutagenesis. The fragment was incorporated into a single-copy plasmid to serve as a PCR-positive control and cloned into Escherichia coli to serve as a matrix spike. It was shown to have a detection limit of five copies, using a VIC dye-labeled probe. A DNA extraction kit was optimized that allowed sampling of an entire liter of water. Water samples spiked with the recombinant E. coli cells were shown to behave like H. pylori cells in the qPCR assay. The recombinant E. coli cells were optimized to be used at 10 cells/liter of water, where they were shown not to compete with 5 to 3,000 cells of H. pylori in a duplex qPCR assay. Four treated drinking water samples spiked with H. pylori (100 cells) demonstrated similar cycle threshold values if the chlorine disinfectant was first neutralized by sodium thiosulfate.

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42

Shaaban, S. "Analysis of an integrated solar combined cycle with steam and organic Rankine cycles as bottoming cycles." Energy Conversion and Management 126 (October 2016): 1003–12. http://dx.doi.org/10.1016/j.enconman.2016.08.075.

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43

Mutlu, Balkan, Derek Baker, and Feyza Kazanç. "Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle." Entropy 23, no. 6 (June 18, 2021): 766. http://dx.doi.org/10.3390/e23060766.

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This study investigates the hybridization scenario of a single-flash geothermal power plant with a biomass-driven sCO2-steam Rankine combined cycle, where a solid local biomass source, olive residue, is used as a fuel. The hybrid power plant is modeled using the simulation software EBSILON®Professional. A topping sCO2 cycle is chosen due to its potential for flexible electricity generation. A synergy between the topping sCO2 and bottoming steam Rankine cycles is achieved by a good temperature match between the coupling heat exchanger, where the waste heat from the topping cycle is utilized in the bottoming cycle. The high-temperature heat addition problem, common in sCO2 cycles, is also eliminated by utilizing the heat in the flue gas in the bottoming cycle. Combined cycle thermal efficiency and a biomass-to-electricity conversion efficiency of 24.9% and 22.4% are achieved, respectively. The corresponding fuel consumption of the hybridized plant is found to be 2.2 kg/s.

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Khatoon, Saboora, Nasser Mohammed A. Almefreji, and Man-Hoe Kim. "Thermodynamic Study of a Combined Power and Refrigeration System for Low-Grade Heat Energy Source." Energies 14, no. 2 (January 13, 2021): 410. http://dx.doi.org/10.3390/en14020410.

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This study focuses on the thermal performance analysis of an organic Rankine cycle powered vapor compression refrigeration cycle for a set of working fluids for each cycle, also known as a dual fluid system. Both cycles are coupled using a common shaft to maintain a constant transmission ratio of one. Eight working fluids have been studied for the vapor compression refrigeration cycle, and a total of sixty-four combinations of working fluids have been analyzed for the dual fluid combined cycle system. The analysis has been performed to achieve a temperature of −16 °C for a set of condenser temperatures 34 °C, 36 °C, 38 °C, and 40 °C. For the desired temperature in the refrigeration cycle, the required work input, mass flow rate, and heat input for the organic Rankine cycle were determined systematically. Based on the manifestation of performance criteria, three working fluids (R123, R134a, and R245fa) were chosen for the refrigeration cycle and two (Propane and R245fa) were picked for the organic Rankine cycle. Further, a combination of R123 in the refrigeration cycle with propane in the Rankine cycle was scrutinized for their highest efficiency value of 16.48% with the corresponding highest coefficient of performance value of 2.85 at 40 °C.

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45

Oreijah, Mowffaq, Abhijit Date, and Aliakbar Akbarzadaha. "Comparison between Rankine Cycle and Trilateral Cycle in Binary System for Power Generation." Applied Mechanics and Materials 464 (November 2013): 151–55. http://dx.doi.org/10.4028/www.scientific.net/amm.464.151.

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An experimental validation on laboratory scale has been conducted to investigate and to compare two thermodynamic cycles, Trilateral Flash Cycle (TFC) and Organic Rankine Cycle (ORC). The research covers the heat engine utilizing a hydrothermal resource to compare the performance of TFC and ORC. This research would help to analysis the thermal efficiency and power efficiency for both cycles. TFC shows a higher power production than in ORC for the same applied parameters. ORC, however, can be operated at lower rotational speed than for TFC. This project could help, also, to evaluate the current two phase screw expander for both cycles. It is concluded to propose a larger heat exchanger for TFC as the heat recovery can be more reliable in this cycle than in ORC. This research can be applied to generate electrical power from hydrothermal resources such as geothermal energy and solar thermal.

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Baral, Suresh, and Kyung Chun Kim. "Simulation, Validation and Economic Analysis of Solar Powered Organic Rankine Cycle for Electricity Generation." Journal of Clean Energy Technologies 3, no. 1 (2015): 62–67. http://dx.doi.org/10.7763/jocet.2015.v3.170.

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Yang, Kai, and Hongguang Zhang. "Performance Analysis of the Organic Rankine Cycle (ORC) System under Engine Various Operating Conditions." Journal of Clean Energy Technologies 3, no. 5 (2015): 340–44. http://dx.doi.org/10.7763/jocet.2015.v3.220.

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48

ENDO, Naoki. "ICOPE-15-1157 Improvement of organic Rankine cycle by the use of heat pump." Proceedings of the International Conference on Power Engineering (ICOPE) 2015.12 (2015): _ICOPE—15——_ICOPE—15—. http://dx.doi.org/10.1299/jsmeicope.2015.12._icope-15-_104.

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49

Lecompte, Steven, Erika Ntavou, Bertrand Tchanche, George Kosmadakis, Aditya Pillai, Dimitris Manolakos, and Michel De Paepe. "Review of Experimental Research on Supercritical and Transcritical Thermodynamic Cycles Designed for Heat Recovery Application." Applied Sciences 9, no. 12 (June 25, 2019): 2571. http://dx.doi.org/10.3390/app9122571.

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Supercritical operation is considered a main technique to achieve higher cycle efficiency in various thermodynamic systems. The present paper is a review of experimental investigations on supercritical operation considering both heat-to-upgraded heat and heat-to-power systems. Experimental works are reported and subsequently analyzed. Main findings can be summarized as: steam Rankine cycles does not show much studies in the literature, transcritical organic Rankine cycles are intensely investigated and few plants are already online, carbon dioxide is considered as a promising fluid for closed Brayton and Rankine cycles but its unique properties call for a new thinking in designing cycle components. Transcritical heat pumps are extensively used in domestic and industrial applications, but supercritical heat pumps with a working fluid other than CO2 are scarce. To increase the adoption rate of supercritical thermodynamic systems further research is needed on the heat transfer behavior and the optimal design of compressors and expanders with special attention to the mechanical integrity.

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YAMANE, Dai, Takahiko MIYAZAKI, Shigeru KOYAMA, Norito UCHIYAMA, Yasuyuki FUJITA, and Hirotaka DOHI. "Thermodynamic cycle simulation of organic Rankine cycles using zeotropic mixtures as working fluids." Proceedings of the National Symposium on Power and Energy Systems 2017.22 (2017): D212. http://dx.doi.org/10.1299/jsmepes.2017.22.d212.

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