Relevant bibliographies by topics / Turbo expanders

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Turbo expanders'

Author: Grafiati
Published: 5 June 2025
Last updated: 24 June 2025

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Journal articles on the topic "Turbo expanders"

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Adams, Jacob, Nathaniel O’Connor, Matthew Jones, and John Brisson. "Experimental improvements to the acoustic expander with applications to cryogenic refrigeration." IOP Conference Series: Materials Science and Engineering 1327, no. 1 (2025): 012146. https://doi.org/10.1088/1757-899x/1327/1/012146.

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Abstract The acoustic expander is an innovative cryogenic component that uses pressure waves for work transfer as part of a continuous flow, recuperative cycle refrigerator. This expander uses passive reed-valves coupled to an acoustic resonator to produce refrigeration. The passive reed-valves are pressure-controlled by the imposed, static pressure difference across the expander and the natural oscillating pressure in the resonator. The resonator is a series of tubes and cones. The practical implications of these simple components are that the acoustic expander does not require controlled valving or close-tolerance sliding seals at low-temperature, unlike existing piston- or turbo-expanders. This work compares two resonator designs, a harmonic resonator and a non-harmonic resonator. The non-harmonic resonator is excited by a single-frequency allowing for operation at an expansion pressure-ratio of 2.4. These expanders are expected to be useful in medium-scale refrigeration applications that are not well served by current small-scale Stirling cryocoolers or large-scale turbo-expander refrigerators.
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Fermoselli, N. E. G. "PREDICTING THE IMPACT OF A FCC TURBO EXPANDER ON PETROLEUM REFINERIES." Revista de Engenharia Térmica 9, no. 1-2 (2010): 40. http://dx.doi.org/10.5380/reterm.v9i1-2.61929.

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Implementing a turbo expander connected to a fluid catalytic cracking (FCC) unit in order to produce power from flue gas has already become a common practice in oil refineries worldwide. Despite of recovering energy which used to be wasted in an orifice chamber, the implementation of expander and its skids still requires high investment, which often begins with a third-stage cyclones installation to enhance flue gas cleanness. Moreover, machine and also pipes need to be made with special materials in order to resist high temperatures and erosion. Hence, there are some items to be checked before start up a turbo expander to ensure the return on investment will reach expectations, keeping in mind that its ability to extract energy from flue gas changes widely depending on FCC operational conditions. Then, the aim of this paper is to provide the analysis of one stage turbo expander which is fed with flue gas from partial combustion FCC unit and installed with isolation valves, highlighting some points which deserve special attention before start up this type of machine. It brings together some approaches to provide valuable information about a turbo expander, particularly when it is not running yet, including the results to a hypothetical case and the sequence of calculus that can be done without using any special software applied for: • To estimate real energy generation through the turbo expander as a function of FCC feed; • To check the leaks effect; • To predict the impact of turbo expander on carbon monoxide boiler, due to a fall in temperature of the expanded flue gas; • To calculate the appropriate amount of extra supplementary gas required to be burned in the flue gas boiler in order to keep the production of steam stable; • To analyze the moisture of the flue gas so that it may predicts condensation when hot gas comes into contact with the cold duct, after opening isolation valves; • And finally, how turbo expanders fit in cleaning development mechanism to get certified carbon credits.
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Antipenkov, B. A., A. B. Davydov, A. Sh Kobulashvili, G. A. Perestoronin, and A. A. Fal'chenko. "Turbo-expanders for mobile air separation equipment." Chemical and Petroleum Engineering 21, no. 3 (1985): 125–27. http://dx.doi.org/10.1007/bf01154881.

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Adams, Jacob L., and J. G. Brisson. "Acoustic expanders for use in recuperative cryocoolers." IOP Conference Series: Materials Science and Engineering 1301, no. 1 (2024): 012134. http://dx.doi.org/10.1088/1757-899x/1301/1/012134.

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Abstract An acoustic expander has been developed for use in recuperative cryocoolers. The acoustic expander uses reed-valves to generate a standing acoustic wave from a continuously expanding flow. The mechanical energy from the wave is passively dissipated to the ambient environment. The acoustic expander does not require complex moving parts or control mechanisms at low-temperature; in contrast to piston- or turbo-expanders that require moving displacers or spinning shafts. This expander has demonstrated isentropic expansion efficiencies of 50% for a pressure ratio of 1.4 and expansion efficiencies of 40% for a pressure ratio of 1.9 with air as the working fluid.
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Martyanov, O. A., and V. I. Merkulov. "Overview of the problem of moist air flow in turbo-expanders." Izvestiya MGTU MAMI 8, no. 4-1 (2014): 51–55. http://dx.doi.org/10.17816/2074-0530-67673.

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Ke, Changlei, Lianyou Xiong, Nan Peng, et al. "Efficiency Improvement of Small Cryogenic Helium Turbo-expanders in TIPC." IOP Conference Series: Materials Science and Engineering 1301, no. 1 (2024): 012028. http://dx.doi.org/10.1088/1757-899x/1301/1/012028.

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Abstract An experimental helium liquefier/refrigerator, using ultra high speed cryogenic turbo-expanders is designed and developed in Technical Institute of Physics and Chemistry (TIPC), and liquefaction rate of around 42 L/hr and refrigeration capacity of around 130 W @ 4.5 K is achieved. The turbo-expander constitutes the most critical component of a helium liquefier/refrigerator causing that the turbine efficiency has a great influence on the performance of the whole cryogenic process plant. Inlet Flow Radial (IFR) turbine design is dictated by criteria like velocity ratios. For small flow rate plants the size of the turbine impeller needs to be reduced. In order to reach a high efficiency, the rotational speed must be increased to complete a large specific enthalpy drop. The present article describes the latest technical developments at TIPC, including results obtained during field trials with the TIPC helium liquefier and refrigerator. The motivation of these developments is to improve the efficiency of the machines, and also to widen the range of operation.
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NAKAYAMA, Yoshihiro, Tetsuro MATSUMOTO, and Sadao SATO. "Cool-down characteristics of helium liquefier with turbo-expanders." TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 23, no. 1 (1988): 23–29. http://dx.doi.org/10.2221/jcsj.23.23.

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Barmby, T. H., and A. Cleveland. "Control Systems for Turbo Expanders in Pressure Reduction Service." Journal of Engineering for Gas Turbines and Power 113, no. 2 (1991): 296–99. http://dx.doi.org/10.1115/1.2906562.

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Kitt, S. R., and B. D. Rose. "Foothills Decompression/Recompression Facilities—Unique Power Recovery Application in Gas Pipelines." Journal of Engineering for Gas Turbines and Power 116, no. 1 (1994): 143–51. http://dx.doi.org/10.1115/1.2906783.

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Foothills Pipe Lines Ltd. is the Canadian sponsor of the Alaska Natural Gas Transportation System (ANGTS), a pipeline project selected in Canada and the United States as the means for transporting Alaskan gas reserves to the lower 48 United States. Currently, certain Prebuild portions of the ANGTS are in operation delivering Canadian gas to U. S. markets. A recent system expansion of the Eastern Leg Prebuild to accommodate increased Canadian gas exports entailed the construction of Decompression/Recompression facilities at Empress, Alberta to enable high-pressure operation of the Foothills pipeline while maintaining gas stripping at existing lowpressure extraction plants. The general process of the Decompression/Recompression facilities involves the expansion of high-pressure pipeline gas to conditions acceptable to the low-pressure extraction plants, then the recompression of the residue gas for return to the pipeline at original pressure. By directing the inlet gas through turbo expanders coupled to brake compressors, a substantial portion of the expansion energy is captured and used in providing the first stage of gas recompression. Including supplemental conventional compression, the Decompression/Recompression facilities are capable of providing approximately 37MW (50,000 HP) for continuous gas recompression. Although power recovery with turbo expanders is relatively common in the gas processing industry, such an application for gas recompression in large gas pipelines is unique. This technical paper describes the Foothills Decompression/Recompression facilities with their utilization of turbo expanders for pipeline recompression service, emphasizing the process design as well as the characteristics of the rotating equipment.
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Renuke, Avinash, Alberto Traverso, and Matteo Pascenti. "Experimental Campaign Tests on a Tesla Micro-Expanders." E3S Web of Conferences 113 (2019): 03015. http://dx.doi.org/10.1051/e3sconf/201911303015.

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This paper presents the experimental campaign on Tesla turbo expanders carried out at Thermo-chemical Power group (TPG) of University of Genoa, Italy. An experiment system is established using compressed air as a working fluid. A 200 W turbine is tested with rotational speed up to 40000 rpm. Experimental analysis focused mainly on the efficiency features of this expander, showing the impact on performance of different disk gaps, disk thickness, discharge holes, exhaust geometry, as a function of speed and mass flow. An improved version of 3 kW air Tesla turboexpander is built. Preliminary experimental results are discussed along with the effect of number of nozzles on the performance of the turbine.
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Dissertations / Theses on the topic "Turbo expanders"

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Gabrielli, Paolo. "Design and optimization of turbo-expanders for organic rankine cycles." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6829/.

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In a world focused on the need to produce energy for a growing population, while reducing atmospheric emissions of carbon dioxide, organic Rankine cycles represent a solution to fulfil this goal. This study focuses on the design and optimization of axial-flow turbines for organic Rankine cycles. From the turbine designer point of view, most of this fluids exhibit some peculiar characteristics, such as small enthalpy drop, low speed of sound, large expansion ratio. A computational model for the prediction of axial-flow turbine performance is developed and validated against experimental data. The model allows to calculate turbine performance within a range of accuracy of ±3%. The design procedure is coupled with an optimization process, performed using a genetic algorithm where the turbine total-to-static efficiency represents the objective function. The computational model is integrated in a wider analysis of thermodynamic cycle units, by providing the turbine optimal design. First, the calculation routine is applied in the context of the Draugen offshore platform, where three heat recovery systems are compared. The turbine performance is investigated for three competing bottoming cycles: organic Rankine cycle (operating cyclopentane), steam Rankine cycle and air bottoming cycle. Findings indicate the air turbine as the most efficient solution (total-to-static efficiency = 0.89), while the cyclopentane turbine results as the most flexible and compact technology (2.45 ton/MW and 0.63 m3/MW). Furthermore, the study shows that, for organic and steam Rankine cycles, the optimal design configurations for the expanders do not coincide with those of the thermodynamic cycles. This suggests the possibility to obtain a more accurate analysis by including the computational model in the simulations of the thermodynamic cycles. Afterwards, the performance analysis is carried out by comparing three organic fluids: cyclopentane, MDM and R245fa. Results suggest MDM as the most effective fluid from the turbine performance viewpoint (total-to-total efficiency = 0.89). On the other hand, cyclopentane guarantees a greater net power output of the organic Rankine cycle (P = 5.35 MW), while R245fa represents the most compact solution (1.63 ton/MW and 0.20 m3/MW). Finally, the influence of the composition of an isopentane/isobutane mixture on both the thermodynamic cycle performance and the expander isentropic efficiency is investigated. Findings show how the mixture composition affects the turbine efficiency and so the cycle performance. Moreover, the analysis demonstrates that the use of binary mixtures leads to an enhancement of the thermodynamic cycle performance.
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Zou, Aihong. "Uncertainty quantification in high-density fluid radial-inflow turbo-expanders and diffusers for renewable low-grade temperature cycles." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/128481/1/Aihong_Zou_Thesis.pdf.

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This research investigated the radial-inflow turbo-expander, the conical diffuser, and the annular-radial diffuser using high-density working fluid in typical renewable energy power system. This study highlights the need to achieve a high performance of a whole radial-inflow turbine including a radial-inflow turbo-expander and a new designed annular-radial diffuser in order to improve overall energy conversion efficiency, which is critical to further development of renewable power solutions.
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Alshammari, Fuhaid. "Radial turbine expander design, modelling and testing for automotive organic Rankine cycle waste heat recovery." Thesis, Brunel University, 2018. http://bura.brunel.ac.uk/handle/2438/16007.

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Since the late 19th century, the average temperature on Earth has risen by approximately 1.1 °C because of the increased carbon dioxide (CO2) and other man-made emissions to the atmosphere. The transportation sector is responsible for approximately 33% of the global CO2 emissions and 14% of the overall greenhouse gas emissions. Therefore, increasingly stringent regulations in the European Union require CO2 emissions to be lower than 95 gCO₂/km by 2020. In this regard, improvements in internal combustion engines (ICEs)must be achieved in terms of fuel consumption and CO2 emissions. Given that only up to 35% of fuel energy is converted into mechanical power, the wasted energy can be reused through waste heat recovery (WHR) technologies. Consequently, organic Rankine cycle (ORC) has received significant attention as a WHR technology because of its ability to recover wasted heat in low- to medium-heat sources. The Expansion machine is the key component in ORC systems, and its performance has a direct and significant impact on overall cycle efficiency. However, the thermal efficiencies of ORC systems are typically low due to low working temperatures. Moreover, supersonic conditions at the high pressure ratios are usually encountered in the expander due to the thermal properties of the working fluids selected which are different to water. Therefore, this thesis aims to design an efficient radial-inflow turbine to avoid further efficiency reductions in the overall system. To fulfil this aim, a novel design and optimisation methodology was developed. A design of experiments technique was incorporated in the methodology toexplorethe effects of input parameters on turbine performance and overall size. Importantly, performance prediction modelling by means of 1D mean-line modelling was employed in the proposed methodology to examine the performance of ORC turbines at constant geometries. The proposed methodology was validated by three methods: computational fluid dynamics analysis, experimental work available in the literature, and experimental work in the current project. Owing to the lack of actual experimental works in ORC-ICE applications, a test rig was built around a heavy-duty diesel engine at Brunel University London and tested at partial load conditions due to the requirement for a realistic off-high representation of the performance of the system rather than its best (design) point, while taking into account the limitation of the engine dynamometer employed. Results of the design methodology developed for this projectpresented an efficient single-stage high-pressure ratio radial-inflow turbine with a total to static efficiency of 74.4% and an output power of 13.6 kW.Experimental results showed that the ORC system had a thermal efficiency of 4.3%, and the brake-specific fuel consumption of the engine was reduced by 3%. The novel meanlineoff designcode (MOC) was validated with the experimental works from three turbines. In comparison with the experimental results conducted at Brunel University London, the predicted and measured results were in good agreement with a maximum deviation of 2.8%.
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Nayak, Asutosh. "Development of design software for Cryogenic Turbo Expander." Thesis, 2010. http://ethesis.nitrkl.ac.in/1641/1/thesis10603004.pdf.

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This thesis provides the complete designing procedures encapsulated in an object oriented programming. The software is written in C++codes and gives the detail design of each component of the cryogenic turbo expander. The design procedure is complied in a very systematic manner due to the work of various person in this typical region. The thesis begins with the introduction of a Turbo expander. It contains the literature review which states the work done by various person with passage of time. The anatomy of turbo expander provides the complete picture and the understanding basics of each parts which helps in knowing and analyzing various parameters associated. A systematic approach of calculation is mentioned with the draw of flowcharts and step wise algorithm. The various chapters helps in designing codes for the design of cryogenic turbo-expander.The codes are effective and is very user friendly.
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Senthooran, Ravikumar. "Computational Fluid Flow analysis in Cryogenic Turbo expander." Thesis, 2014. http://ethesis.nitrkl.ac.in/5765/1/110ME0647-7.pdf.

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Cryogenic turbo expander is one of the components used in cryogenic plant to achieve low temperature refrigeration. Basic components in cryogenic Turbo expander are Turbine wheel, brake Compressor, shaft, nozzle, Thrust bearing, Journal Bearing etc. In expansion Turbine Temperature of gases decreases due to expansion and produces coldest level of Refrigeration. This project is all about Computational Fluid flow analysis of high speed rotating turbine. This involves with the three dimensional analysis of flow through a radial expansion turbine, using nitrogen as flowing fluid. Cfd packages, Bladegen, Turbogrid and CFX are used to carry out the analysis. Bladegen is used to create the model of turbine using available data of hub, shroud and blade profile. Turbogrid is used to mesh the model. CFX-Pre is used to define the physical parameters of the flow through the Turbo expander. CFX-Post is used for examining and analyzing results. Using these results variation of different thermodynamic properties like Temperature, Pressure, density, velocity etc inside the turbine can be seen. Several graphs are plotted showing the variation of velocity, pressure, temperature, entropy and Mach number along streamline and span wise to analyze the flow through cryogenic turbine
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Behera, Ranjit. "CFD Analysis of Aerostatic Bearing for Cryogenic Turbo-Expander." Thesis, 2016. http://ethesis.nitrkl.ac.in/8369/1/2016_MT_214M85442_RBehera.pdf.

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Expansion turbine plays the major role in any cryogenic plants like helium and hydrogen liquefier,air separation plants and low temperature refrigerator.These turbines run at speed around 50,000 to 5,00,000 rpm.At such a high speed no bearing is feasible to support the load except gas bearing.In gas bearing there is no physical contact between stator and rotor takes place so the friction between the stator and rotor is negligible.Because of this the rotor can move smoothly inside the stator.Hence aerostatic bearing used for achieving high accuracy and precession. Due to cleanness of aerostatic bearing it is also used in electronic and food processing industry.In order to avoid complexities at the time of formulation analytical studies has been carried out.Governing variables are kept limited that helps in dynamic and performance conduct of aerostatic bearing.Finally a three dimensional model of aerostatic bearing was built in Solidworks and a two dimensional cross-section model of aerostatic bearing in ANSYS workbench 15. After doing rectangular meshing to the geometry made in workbench Computational fluid dynamics(CFD)analysis was done in ANSYS Fluent. The pressure and velocity distribution at the bearing clearance and at orifice had shown.It is found that there is rapid change in pressure and velocity at the exit of the orifice.Variation of Load carrying capacity with the change of inlet pressure was studied and compared with numerical value
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talluri, lorenzo. "Micro turbo expander design for small scale ORC: Tesla turbine." Doctoral thesis, 2019. http://hdl.handle.net/2158/1153897.

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Over the last years, the increase in energy consumption coupled with ever more stringent regulations on pollutants emissions and the massive advent of renewables in the energy market, have promoted the development of distributed energy systems and thus of an increasing interest towards small and micro power generation systems. In this context, the ORC progressively became the leading technology in the field of low size energy conversion systems (<100 kW) and low temperature applications (<150°C). Nonetheless, this technology still deserves further developments, especially regarding the design of specific components, which should grant features of reliability, acceptable performance level and, often even more important, affordable price in order to ensure the attractiveness of the whole energy system. It is the case of the small and micro expanders (tens to few kW scale). A possible solution for micro–size expanders is the Tesla expander, which is a viscous bladeless turbine that holds the desired characteristics of low cost and reliability. This expander was first developed by N. Tesla at the beginning of the 20th century, but it did not stir up much attention due to the strong drive towards large centralized power plants, where this technology becomes no longer competitive against those belonging to bladed expanders. In the recent years, due to the increasing appeal towards micro power generation and energy recovery from wasted flows, this cost effective expander technology rose a renovated interest. In the present study, a 2D numerical model is realized and a design procedure of a Tesla turbine for ORC applications is proposed. A throughout optimization method is developed by evaluating the losses of each component and by introducing an innovative rotor model. The main optimizing parameters of the turbine, such as the rotor inlet/outlet diameter ratio, channel width–rotor diameter ratio and tangential velocity–rotational speed ratio at rotor inlet are highlighted and assessed. The 2D model results are further exploited through the development of 3D computational investigation, which allows an accurate comprehension of the flow characteristics, which are difficult to depict with a 2D code. Finally, two prototypes are designed, realized and tested. The former one is designed to work with air as working fluid, with the stator made in ABS with additive manufacturing technique, in order to show a possible cost effective way of realization. The obtained experimental results of this prototype well match the numerical predictions. A 94 W net power output with 11.2% efficiency are measured. The second prototype is designed to work with organic fluids (specifically with R404A), and it is ultimately tested with R1233zd(E). A standard metal manufacturing is followed for this prototype. The achieved experimental results confirmed the validity and the large potential applicative chances of this emerging technology, especially in the field of micro ii sizes, low inlet temperature and low expansion ratios. 371 W net power output at 10% shaft efficiency are obtained. The experimental results allowed the validation of numerical models, which was among the main objectives of this work. In this way, the numerical procedure may be reliably employed as the tool for the accurate and optimised design of Tesla turbines for organic Rankine cycles but also for applications with gas like air. As a final remark, it can be affirmed that the operability of the Tesla expander was demonstrated in this work. Thus, it may be considered as a suitable and realizable solution to tackle one of the present issues related to micro expanders, namely high costs and low reliability, which, moreover, suffers off design conditions only to a limited extent. The realization of a reliable design tool is another fundamental outcome of the present work.
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Book chapters on the topic "Turbo expanders"

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Yang, Jintang, Jiaohua Shi, Gongfa Li, Zhaohui Xia, Shiyang Zhou, and Wen Chen. "Design and Realization of Turbo-expander Control System." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19706-2_50.

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Ino, N., A. Machida, K. Ttsugawa, et al. "Development of High Expansion Ratio Helium Turbo Expander." In Advances in Cryogenic Engineering. Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3368-9_9.

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Kato, T., Y. Kamiyauchi, E. Tada, et al. "Development on a Large Helium Turbo-Expander with Variable Capacity." In Advances in Cryogenic Engineering. Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3368-9_8.

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Izumi, H., S. Harada, K. Matsubara, and S. Saito. "Development of Small Size Claude Cycle Helium Refrigerator with Micro Turbo-Expander." In Advances in Cryogenic Engineering. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2213-9_91.

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Bavarian, Behzad, Jia Zhang, and Lisa Reiner. "Corrosion Inhibition of Stress Corrosion Cracking and Localized Corrosion of Turbo-Expander Materials." In ICAA13: 13th International Conference on Aluminum Alloys. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch60.

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Bavarian, Behzad, Jia Zhang, and Lisa Reiner. "Corrosion Inhibition of Stress Corrosion Cracking and Localized Corrosion of Turbo-Expander Materials." In ICAA13 Pittsburgh. Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48761-8_60.

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Qiu, Shun, Nan Peng, Liangwei Zheng, et al. "Multi-field Coupling Rotor Characteristics Analysis for High Speed Turbo Expander Generator Brake." In Proceedings of the 28th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2022. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-6128-3_26.

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Kato, T., A. Miyake, K. Kawano, et al. "Design and Test of a Wet Type Helium Turbo-Expander with an Alternator as a Brake." In Advances in Cryogenic Engineering. Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2522-6_111.

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Ribary, Marton, Paul Krause, Miklos Orban, Eugenio Vaccari, and Thomas Wood. "Prompt Engineering and Provision of Context in Domain Specific Use of GPT." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2023. http://dx.doi.org/10.3233/faia230979.

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Large Language Models (LLMs) can appear to generate expert advice on legal matters. However, at closer analysis, some of the advice provided has proven unsound or erroneous. We tested LLMs’ performance in the procedural and technical area of insolvency law in which our team has relevant expertise. This paper demonstrates that statistically more accurate results to evaluation questions come from a design which adds a curated knowledge base to produce quality responses when querying LLMs. We evaluated our bot head-to-head on an unseen test set of twelve questions about insolvency law against the unmodified versions of gpt-3.5-turbo and gpt-4 with a mark scheme similar to those used in examinations in law schools. On the “unseen test set”, the Insolvency Bot based on gpt-3.5-turbo outper-formed gpt-3.5-turbo (p = 1.8%), and our gpt-4 based bot outperformed unmodified gpt-4 (p = 0.05%). These promising results can be expanded to cross-jurisdictional queries and be further improved by matching on-point legal information to user queries. Overall, they demonstrate the importance of incorporating trusted knowledge sources into traditional LLMs in answering domain-specific queries.
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Street, Joe. "The Turbo-capitalist Tech Bro." In Silicon Valley Cinema. Edinburgh University Press, 2023. http://dx.doi.org/10.3366/edinburgh/9781399505826.003.0010.

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Part three’s final chapter expands on chapter eight to reveal how the science fiction films critique Silicon Valley capitalism through their villains, linking this to the ‘tech-bro’ phenomenon that emerged in the early twenty first century. It links the villains’ Promethean urges to their fidelity to a winner-takes-all form of individualist capitalism that has its roots in Ayn Rand’s philosophy.
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Conference papers on the topic "Turbo expanders"

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Bavarian, Behzad, Jia Zhang, and Lisa Reiner. "Electrochemical and SCC Inhibition of Multi-alloy Systems Using Vapor Corrosion Inhibitors." In CORROSION 2013. NACE International, 2013. https://doi.org/10.5006/c2013-02130.

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Abstract Commercially available inhibitors were successfully investigated for their effectiveness in reducing the corrosion susceptibility of the turbo expander and steam/gas turbine industry alloys. However, due to the fact that the power generating system is complex and consists of a multi-alloy system, the investigation was expanded to study the corrosion behavior and stress corrosion susceptibility of other alloys such as, copper, brass C36000, C69300, red brass C83600, and nickel plated-copper in the presence of these inhibitors. Electrochemical behavior (cyclic polarization and EIS) of these alloys in a 200 ppm chloride solution with different percentages of inhibitor showed significant improvement in passivity, and breakdown potentials. The data acquired from electrochemical tests showed that inhibitor adsorption to the alloy surfaces fits with the Langmuir adsorption isotherm; the enthalpy of adsorption is about -10 to -16 kJ/mol, suggesting that this chemical compound provides physisorption to the alloy surfaces. During testing per ASTM(1) standards G44 and G38, no susceptibility to environmentally-assisted cracking was observed upon the addition of 10% inhibitor.
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Cleveland, Anthony. "Energy Recovery With Turbo Expanders." In ASME 1986 International Gas Turbine Conference and Exhibit. American Society of Mechanical Engineers, 1986. http://dx.doi.org/10.1115/86-gt-66.

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In the oil, gas and petrochemical industry, there are many instances where energy is under-utilized, if not actually wasted. In many cases it may be possible to recover some of this energy and obtain useful work, thereby improving plant efficiency and the economics of the operation. The turbo expander is a simple device that can make a significant contribution to the recovery of energy in all kinds of plants. This paper considers some ways in which turbo expanders may be used and looks in detail at an application in the gas industry where the energy lost in pressure reduction may be recovered and used to assist in reducing operating costs. The design criteria for such turbo expanders are discussed and areas for future development are proposed. The paper concludes that there are significant gains to be made in the recovery of waste energy and that the turbo expander can play a major role in this activity.
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Wang, Xing, Xiaomin Liu, and Chuhua Zhang. "Performance Analysis of Organic Rankine Cycle With Preliminary Design of Radial Turbo Expander for Binary-Cycle Geothermal Plants." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95933.

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In order to produce less emission of greenhouse gas, many studies have been done on the binary-cycle geothermal power plant to obtain the better performance. The radial turbo expander plays an important role in the performance of Organic Rankine Cycle (ORC) for binary-cycle geothermal plants. However, few studies have investigated the effect of parameters of radial turbo expander on the performance of ORC. In this paper, a new thermodynamic model of ORC coupled with the preliminary design of radial turbo expanders is developed. The effects of geothermal water temperature on the ORC performance parameters such as power output and thermal efficiency are investigated by using the proposed thermodynamic model. The variation of radial turbo expanders’ parameters such as specific rotational speed with geothermal water temperature is revealed. In the present study, the more reasonable efficiency of radial turbo expanders by using the preliminary design is adapted to analysis the performance of ORC, and more accuracy reference about the effect of geothermal source on the parameters of radial turbo expanders is obtained.
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Cleveland, A. "Turbo Expanders for Energy Recovery; Design and Installation of a 250 Kw Unit." In ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/88-gt-266.

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Turbo expanders have been used in a number of installations to generate electricity from the energy available in the process of pressure reduction. The turbo expander replaces the regulating valve and duplicates the functions of the valve, controlling pressure and flow while at the same time generating electricity.
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5

Perri, Alessandro, Avinash Renuke, and Alberto Traverso. "Innovative Expanders for Supercritical Carbon Dioxide Cycles." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-83116.

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Abstract Supercritical carbon dioxide plants are attracting strong interest, particularly for distributed power generation, thanks to the high-power density, allowing high compactness and efficiencies due to the particular features of the fluid conditions near the critical point. In the present work, the feasibility of innovative turboexpanders is evaluated for the first European demonstrator of MW size, coupling small volumetric flows with technological simplicity, typical of these types of plants. In particular, the possibility of replacing conventional turbines with bladeless expanders is studied, proposing a design in line with those achievable by small radial and axial turbomachines. The bladeless expanders consist of flat parallel disks mounted on a shaft, separated by spacers to maintain small gaps between them. The laminar flow inside the rotor makes it highly efficient: however, rotor-stator interaction losses reduce the overall performance. Such bladeless expanders maintain high interest for their capability to tackle low volumetric flows, their relatively simple design and ease of manufacturability. The design case presented in this paper is the feasibility study of a single modular bladeless expander using the existing conventional design (axial and radial stages) as the reference design. 3D numerical analysis is carried out using commercial computational fluid dynamic software. The results show ∼55% total static efficiency of the bladeless expander at 37000 rpm for approximately 1.25MW output power. The impact on performance at different nozzle throat cross-sections and rotor disks diameter has been discussed. The overall performance of the expander is presented by evaluating the losses and improvement strategies that are discussed.
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Sengupta, Amrita, Prashant Kumar, Pardeep Garg, Nirmal Hui, Matthew S. Orosz, and Pramod Kumar. "Moment Analysis of a Scroll Expander Used in an Organic Rankine Cycle." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26935.

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Recent studies on small-scale power generation with the organic Rankine cycle suggest superior performance of positive displacement type of expanders compared to turbines. Scroll expanders in particular achieve high isentropic efficiencies due to lower leakage and frictional losses. Performance of scroll machines may be enhanced by the use of non-circular involute curves in place of the circular involutes resulting non-uniform wall thickness. In this paper, a detailed moment analysis is performed for such an expander having volumetric expansion ratio of 5 using thermodynamic models proposed earlier by one of the present authors. The working fluid considered in the power cycle is R-245fa with scroll inlet temperature of 125 °C for a gross power output of ∼3.5 kW. The model developed in this paper is verified with an air scroll compressor available in the literature and then applied to an expander. Prediction of small variation of moment with scroll motion recommends use of scroll expander without a flywheel over other positive displacement type of expanders, e.g. reciprocating, where a flywheel is an essential component.
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Kannan, Balaji, Krishnamurthy Vaidyanathan, Kiran Pithamber, and Suvendu Mahapatra. "An Investigation in to the Rotordynamics Behavior of Mechanically Coupled Turbo Expander." In ASME 2014 Gas Turbine India Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gtindia2014-8256.

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Considerable amount of mathematical modeling backed by extensive experimental investigations have gone in to the study of the rotordynamics behavior of high speed turbo expanders. These investigations revolve predominantly around the linear &amp; non-linear aspects of hydrodynamic bearings that support these rotating elements. Further, these expanders are not mechanically coupled to the prime mover and hence the impact of lateral vibrations imposed by the interfacing assemblies downstream is not a concern. However, when the expander is mechanically coupled to a prime mover, say by means of gears, lateral vibrations resulting from the interfacing system is going to have a pronounced effect on the rotordynamics behavior of this system. It is of paramount importance that we account for the stiffness &amp; damping properties of the interface components in order to accurately predict the rotordynamics behavior of the expander. An attempt is being made by the authors to develop an expander and bearing system along with a high speed, multi stage reduction gear box, to understand the impact of lateral vibrations due to mechanical coupling of the expander.
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Yoon, Eunkoo, Hyun Jun Park, Hyun Dong Kim, Kyung Chun Kim, and Sang Youl Yoon. "Experimental Study on the Organic Rankine Cycle Power System Adopting Dual Expanders in Parallel." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26767.

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This study aims to evaluate the performance of an organic Rankine cycle (ORC) power system adopting dual expanders in parallel by experiment. A dual-expander ORC system was designed to provide competitive advantages over a general single expander ORC system in typical applications with large thermal fluctuation of heat sources such as solar heat, marine waste heat, and etc. The ORC system consists of two scroll expanders installed in parallel, a hydraulic diaphragm type pump to feed and pressurize the working fluid, R-245fa, two plate heat exchangers for the evaporator and the condenser, and two generators with shaft power torque meters. The two scroll expanders were modified from two oil-free air scroll compressors, and were tested in the ORC loop with R245fa. The maximum isentropic efficiency of each expander was measured about 53%, and the shaft power was reached to about 2kW. The hot water was used as heat source, and the water temperature was controlled up to 150 °C by the 100 kW-class electric heater. A circulating air-cooled chiller was utilized for the control of the cooling water temperature. In order to determine the static performance of the system, efficiencies and shaft powers were measured with 130 °C heat source temperature. In addition, performance tests were conducted with various working fluid mass flow rates to control pressure ratios. The characteristics and total thermal efficiency of the dual parallel expander ORC system and optimal operating modes are addressed.
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Barmby, T. Hugh, and Anthony Cleveland. "Control Systems for Turbo Expanders in Pressure Reduction Service." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-349.

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This paper considers some of the aspects of control of a turbo expander used in pressure reduction service to generate electricity. The parameters governing the performance of the expander and the connection of the expander generator system into a grid or electric supply system are discussed and the practical requirements of a suitable control system are outlined. The essential elements of a system to provide stability and control of certain selected parameters are described and extensions of control to include other functions and to provide additional data for evaluation are reviewed.
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Rubechini, Filippo, Michele Marconcini, Andrea Arnone, Alberto Scotti Del Greco, and Roberto Biagi. "Special Challenges in the CFD Modeling of Transonic Turbo-Expanders." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95554.

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High pressure ratio turbo-expanders often put a strain on CFD modeling. First of all, the working fluid is usually characterized by significant departures from the ideal behavior, thus requiring the adoption of a reliable real gas model. Moreover, supersonic flow conditions are typically reached at the nozzle vanes discharge, thus involving the formation of a shock pattern, which is in turn responsible for a strong unsteady interaction with the wheel blades. Under such circumstances, performance predictions based on classical perfect gas, steady-state calculations can be very poor. While reasonably accurate real gas models are nowadays available in most flow solvers, unsteady real gas calculations still struggle to become an affordable tool for investigating turbo-expanders. However, it is emphasized in this work how essential the adoption of a time-accurate analysis can be for accurate performance estimations. The present paper is divided in two parts. In the first part, the computational framework is validated against on-site measured performance from an existing power plant equipped with a variable-geometry nozzled turbo-expander, for different nozzle positions, and in design and off-design conditions. The second part of the paper is devoted to the detailed discussion of the unsteady interaction between the nozzle shock waves and the wheel flow field. Furthermore, an attempt is made to identify the key factors responsible for the unsteady interaction and to outline an effective way to reduce it.
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Reports on the topic "Turbo expanders"

1

Moore, Jeff. Development of a High-Efficiency Hot Gas Turbo-expander and Low-Cost Heat Exchangers for Optimized CSP Supercritical CO2 Operation. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1560368.

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2

Supercritical Carbon Dioxide Turbo-Expander and Heat Exchangers (Fact Sheet). Office of Scientific and Technical Information (OSTI), 2012. http://dx.doi.org/10.2172/1053322.

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