Thematische Bibliographien / Rotary regenerator

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Auswahl der wissenschaftlichen Literatur zum Thema „Rotary regenerator“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 18. Februar 2022

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Zeitschriftenartikel zum Thema "Rotary regenerator"

Hajabdollahi, Hassan, und Mohammad Shafiey Dehaj. „Rotary regenerator: Constructal thermoeconomic optimization“. Journal of the Taiwan Institute of Chemical Engineers 113 (August 2020): 231–40. http://dx.doi.org/10.1016/j.jtice.2020.08.020.

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Romie, F. E. „Transient Response of Rotary Regenerators“. Journal of Heat Transfer 110, Nr. 4a (01.11.1988): 836–40. http://dx.doi.org/10.1115/1.3250582.

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Exit gas temperature responses of the counterflow rotary regenerator are found for a unit step increase of the inlet temperature of either gas. An analytic solution applicable during the first part of the transient shows that the responses cannot be smooth. The overall response is found by dividing the regenerator disk into pie-shaped segments and approximating the area-mean gas temperature leaving a segment as the temperature of the gas leaving a small regenerator located at the center of the segment. The method is shown to give good accuracy and is in agreement with predictions of the analytic solution.

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Abroshan, Hamid, und Mahdi Goodarzi. „Optimization of a three-layer rotary generator using genetic algorithm to minimize fuel consumption“. Journal of Mechanical Engineering and Sciences 14, Nr. 1 (23.03.2020): 6304–21. http://dx.doi.org/10.15282/jmes.14.1.2020.09.0494.

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Reduction of fuel consumption in power plants is an important issue due to their high rate of fuel usage. In the present article, this was done by optimizing rotary regenerator which have a great role in recovering thermal energy in power stations. Heat transfer and pressure drop through 13 popular flow passages of power plant's rotary regenerators were obtained by CFD simulations. The outcomes were used in a mathematical model of the rotary air heater by considering air leakages. The model was capable of distinguishing between different heating surfaces. Then it was used for optimizing a regenerator by genetic algorithm. Rotational speed and dimensions of all three layers (hot end, intermediate layer, and cold end) were optimized to achieve the highest fuel saving. These dimensions were: hydraulic diameters, heating profile type, and length of each layer. Results showed that redesigning these parameters to the optimal values leads to saving of 443 kg of natural gas per hour for one regenerator. A 10 meter regenerator also had the highest reduction in fuel consumption (660 kg/hr). Finally, the influence of air and hot gas temperatures, and air mass flow rate on fuel saving and optimum values of design parameters was discussed.

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Hajabdollahi, Hassan. „Comparison of stationary and rotary matrix heat exchangers using teaching-learning-based optimization algorithm“. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, Nr. 4 (07.07.2017): 493–502. http://dx.doi.org/10.1177/0954408917719769.

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In this paper, two kinds of compact heat exchanger including plate fin heat exchanger and rotary regenerator, respectively the stationary and rotary matrix heat exchanger, are compared. For this purpose, both heat exchangers are optimized by considering three simultaneous objective functions including effectiveness, heat exchanger volume, and total pressure drop using multi-objective teaching learning based optimization algorithm. Six different design parameters are considered for the both plate fin heat exchanger and rotary regenerator. Optimization is performed for the same and different hot and cold side mass flow rates. The optimum results reveal 13.26% growth in the effectiveness, 475.17% increase in the volume, and 95.45% reduction in the pressure drop in RR as compared with plate fin heat exchanger and for the final optimum point. As a result, rotary regenerator is more suitable in the case of high effectiveness and low pressure drop while plate fin heat exchanger is more suitable in the case of space limitation (lower heat exchanger volume).

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Shen, C. M., und W. M. Worek. „A Correlation for the Heat Conduction Effects in Counterflow Rotary Regenerative Heat Exchangers“. Journal of Energy Resources Technology 115, Nr. 4 (01.12.1993): 287–90. http://dx.doi.org/10.1115/1.2906434.

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Equations that predict the dependence of regenerator effectiveness on heat conduction in the matrix both parallel to and perpendicular to the fluid flow are derived from numerical simulations. The equations developed use Biot numbers parallel to the direction of fluid flow (Bix) and perpendicular to the fluid flow direction (Biy), the ratio of heat capacity rates (C*), the heat capacity rate ratio (C*Γ), and the overall number of transfer units (NTUo) to characterize the regenerator performance. Comparison of numerical predictions with those obtained using the equations developed in this paper show excellent agreement. These equations enable designers to accurately account for two-dimensional conduction effects when regenerators are designed.

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Beck, D. S. „Regenerator Effectiveness During Transient Operation“. Journal of Engineering for Gas Turbines and Power 118, Nr. 3 (01.07.1996): 661–67. http://dx.doi.org/10.1115/1.2816699.

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Current designs of regenerative gas turbines include high-effectiveness rotary regenerators. The regenerators make the gas turbines highly efficient during steady-state operation. During engine transients, however, engine efficiency can be low because high-effectiveness regenerators tend to have large cores with large thermal masses, and it can take a long time (minutes for example) for these regenerators to reach their steady-state effectivenesses. The following criterion determines the response time of regenerators: τss˜(mc)R/Cx, where τxx (S) is the time period of transient operation; (mc)R (J/K) is the heat capacity of the core; and Cx (W/K) is the heat-capacity rate of the exhaust. This criterion has been verified through analysis and experimentation. The criterion enables the designer to estimate the fraction of an operating cycle during which the regenerator will have reduced effectiveness.

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Organ, A. J. „Analysis of the gas turbine rotary regenerator“. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 211, Nr. 2 (01.02.1997): 97–111. http://dx.doi.org/10.1243/0954407971526263.

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Recent solution of the ‘Hausen’ regenerator and conjugate heat transfer problems invites a fresh look at the Ritz rotary regenerator. The approach deals readily with the reflux phase (‘hold-up’, flushing or ‘residence time’) and with the effects of friction (re-heating and pressure drop). There is no necessity to assume constant Stanton number, Nst, and friction factor, Cf. With accurate temperature and flow solutions available, recovery ratios in terms of operating parameters are a fait accompli. Optimization for specified duty becomes possible.

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Kluka, J. A., und D. G. Wilson. „Low-Leakage Modular Regenerators for Gas-Turbine Engines“. Journal of Engineering for Gas Turbines and Power 120, Nr. 2 (01.04.1998): 358–62. http://dx.doi.org/10.1115/1.2818130.

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One of the significant problems plaguing regenerator designs is seal leakage resulting in a reduction of thermal efficiency. This paper describes the preliminary design and analysis of a new regenerative heat-exchanger concept, called a modular regenerator, that promises to provide improved seal-leakage performance. The modular regenerator concept consists of a ceramic-honeycomb matrix discretized into rectangular blocks, called modules. Separating the matrix into modules substantially reduces the transverse sealing lengths and substantially increases the longitudinal sealing lengths as compared with typical rotary designs. Potential applications can range from small gas-turbine engines for automotive applications to large stationary gas turbines for industrial power generation. Descriptions of two types of modular regenerators are presented including sealing concepts. Results of seal leakage analysis for typical modular regenerators sized for a small gas-turbine engine (120 kW) predict leakage rates under one percent for most seal-clearance heights.

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Rao, R. V., und V. Patel. „Design optimization of rotary regenerator using artificial bee colony algorithm“. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 225, Nr. 8 (05.08.2011): 1088–98. http://dx.doi.org/10.1177/0957650911407817.

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This study explores the use of artificial bee colony (ABC) algorithm for the design optimization of rotary regenerator. Maximization of regenerator effectiveness and minimization of regenerator pressure drop are considered as objective functions and are treated individually and then simultaneously for single-objective and multi-objective optimization, respectively. Seven design variables such as regenerator frontal area, matrix rotational speed, matrix rod diameter, matrix thickness, porosity, and split are considered for optimization. A case study is also presented to demonstrate the effectiveness and accuracy of the proposed algorithm. The results of optimization using ABC algorithm are validated by comparing with those obtained using genetic algorithm for the same case study. The effect of variation of ABC algorithm parameters on convergence and fitness value of the objective function has also been presented.

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Romie, F. E. „Response of Rotary Regenerators to Step Changes in Mass Rates“. Journal of Heat Transfer 112, Nr. 1 (01.02.1990): 43–48. http://dx.doi.org/10.1115/1.2910362.

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Rotary regenerator exit gas temperature responses to step changes in mass flow rates are presented. When the step change is the same for both gases the responses are shown to have a decaying oscillation to the final values of the exit gas temperatures. The source of the oscillations is explained. The responses are found by dividing the regenerator into pie-shaped segments and approximating the area-mean gas temperature leaving a segment as the temperature of the gas leaving a small regenerator located on the central radius of the segment.

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Dissertationen zum Thema "Rotary regenerator"

Riger, Rostislav. „Návrh regeneračního rotačního ohříváku“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443179.

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This thesis deals with regenerative heat exchangers and their operational issues. The theoretical part explains rotary and fixed bed regenerators. Further it includes the most common issues we encounter in operation. Practical part presents a design of rotary regenerator which cools flue gas from wood chip boiler. Calculation contains stechiometry of flue gas and air, design of rotor, calculation of outlet temperatures, strength calculation, dynamic calculation and design of heat exchanger peripherals.

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Benali, Karim Daniel Cunha Ait. „O aqueduto das águas livres como elemento dinamizador e regenerador do eixo Lisboa-Sintra“. Master's thesis, Universidade de Lisboa. Faculdade de Arquitetura, 2016. http://hdl.handle.net/10400.5/12049.

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Dissertação para obtenção do grau de Mestre em Arquitectura com especialização em Urbanismo, apresentada na Universidade de Lisboa - Faculdade de Arquitetura. Assuntos:
O Aqueduto das Águas Livres construído no século XVIII com a finalidade de abastecer a cidade de Lisboa em água potável é uma obra notável de engenharia hidráulica e arquitectónica, que dada a sua grandiosidade e o seu valor patrimonial foi classificado como monumento nacional. Não obstante este facto, tem vindo ao longo dos anos a ser menosprezado como património de indiscutível valor histórico e cultural que é, especialmente depois de ter deixado de transportar as suas águas até à cidade de Lisboa, em meados do século passado. Neste trabalho pretende-se não só requalificar este majestoso equipamento de extensão notável que percorre cinco municípios, como também revalorizá-lo, podendo servir para coser territórios desconexos devido à sua qualidade de elemento agregador. O seu valor histórico poderia também congregar e realçar todo o património cultural da região que atravessa. Dada a sua intrínseca ligação com a estrutura hidrológica, ecológica e morfológica da cidade, assume-se que a recuperação do Aqueduto poderia levar à sua reintegração na cidade. A nível urbanístico, admitindo esta infraestrutura como paisagem, pretende-se que sirva como charneira para organizar tecidos urbanos. Tendo em vista os objectivos acima delineados, procedeu-se em primeiro lugar a uma análise histórica, cultural e arquitectónica do Aqueduto e da sua relação com a evolução da cidade e das suas infraestruturas. Interpretou-se depois o território atravessado por este equipamento público, visando a identificação dos seus riscos e das suas debilidades, mas igualmente das suas valências e oportunidades. De seguida, estabeleceram-se pontes entre o conhecimento da paisagem e os corredores verdes, procurando respostas para a criação de um novo espaço livre que potencie e divulgue o património cultural existente. O trabalho proposto resultou na elaboração de uma estratégia territorial que permite dinamizar as áreas atravessadas pelo Aqueduto. Inferiu-se que a construção de um sistema de parques híbrido, conectado por um novo Corredor Verde, prolongando o existente, de Lisboa até à Amadora, aliado a uma estratégia de mobilidade suave com uma nova rede de pontos notáveis de interesse cultural, irá articular tecidos urbanos actualmente fragilizados e desconexos, reforçando assim a ligação entre a cidade e os territórios periurbanos e rurais. Este corredor seguirá o trajecto do Aqueduto até à sua intersecção com a ribeira de Carenque, e, através da criação de um Parque Linear ao longo deste curso de água, requalificará a nível ambiental o vale que atravessa e fomentará a preservação e divulgação do património cultural do Aqueduto até ao local da sua génese na Mãe de Água Velha.
ABSTRACT: The Águas Livres Aqueduct, built in the eighteenth century to supply the city of Lisbon in drinking water, is a remarkable work of hydraulic and architectural engineering that due to its magnificence and patrimonial value was classified as national monument. Its unquestionable historical and cultural value has, however, over the years been increasingly disregarded, especially since it ceased to carry its waters to the city of Lisbon, in the middle of the last century. This work aims the requalification of this remarkable structure that covers five counties and that, given its capacity to become an aggregating element, will serve to relink disconnected territories. Its historic value could also bring together and highlight all the cultural heritage of the areas that it crosses. Given its intrinsic connection with the hydrological, ecological and morphological structure of the city, one assumes that recovering the Aqueduct could lead to its reintegration in the city. At the urban level, admitting that this infrastructure is part of the landscape, it will serve as a hinge to organize the urban fabric. In view of the above-mentioned objectives, an initial historical, cultural and architectural analysis of the Aqueduct and its relationship with the city and respective infrastructures was carried out. The territory crossed by this public facility was afterwards studied in order to identify not only territorial risks but also future opportunities. Following this study, connections were established between landscape knowledge and green corridors, in order to find answers regarding the creation of a new free space in the city that will enhance and promote the existing cultural heritage. The proposed work resulted in the development of a territorial strategy that will provide a boost for the areas crossed by the aqueduct. It was further concluded that the construction of a hybrid park system, connected by a new Green Corridor that would extend the existing corridor, from Lisbon to Amadora, combined with a smooth mobility strategy composed of a new network of cultural points of interest, would articulate current urban fabric that is fragile and disconnected, thus reinforcing the link between the city and peri-urban and rural areas. This corridor will follow the route of the aqueduct until it intersects with the stream of Carenque and through the creation of a linear park, along this waterway, the valley will be environmentally rehabilitated, fostering the preservation and promotion of the Aqueduct´s cultural heritage up to the place of its origin, in the Mãe de Água Velha.

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Alegrim, Georg, und Alexander Anaje. „Värmeåtervinning av luft i kycklingstallar : Återanvändning av energin i frånluften för luftförvärmning“. Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-82239.

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I Sverige har konsumtionen av kyckling per invånare ökat de senaste åren och idag konsumeras 23,2kg per person och år. Eftersom tillväxten för svensk kyckling är hög ökar också medvetenheten hos företag att investera i klimatsmarta alternativ för att minska energibehovet som leder till en minskad uppvärmningskostnad. Det valda djurstallet värms upp med en flispanna där vattenburna värmeelement förser stallet med värme längs väggarna. Syftet med studien är att undersöka hur mycket värmeenergi som går att spara genom att använda den utsugna luften för att värma den luften som sugs in med hjälp av en värmeväxlare. Det har ansetts problematiskt att använda stallets frånluft för att tillgodose energi i form av värme eftersom den oftast är dammig och detta bidrar till att filter och kanaler täpps igen. Idag finns det ett antal luftvärmeväxlare som klarar denna typ av damm och partiklar. Två olika värmeväxlare har jämförts, en rekuperativ (plattvärmeväxlare) och en regenerativ (roterande värmeväxlare). Stallet måste hålla ett lågt CO2 värde och kycklingarnas ströbädd måste hållas torr med hjälp av en låg luftfuktighet. Ventilationens volymflöde är ett beräknat teoretiskt värde. Resultatet av de två jämförda värmeväxlarna visar att den regenerativa (roterande) värmeväxlaren återför fukt vilket som bidrar till en fuktigare ströbädd jämfört med den rekuperativa (plattvärmeväxlare) som inte återför fukt. Studien genomfördes under kycklingarnas uppfödningstid, vilket varade från första januari i 34 dagar framåt. Dag 28–30 blir stallet självförsörjande på värme och värmeväxlaren kan då generera den värmen som krävs utan anläggningens tillhörande flispanna. Med hänsyn till skallklimatet är det att föredra en plattvärmeväxlare då den roterande värmeväxlaren återför vatten av tre gram per kg torr luft. Undersökningen visar det totala värmebehovet, som idag är cirka 48,2 MWh under en uppfödningsomgång, kan minskas med 24,8 MWh med hjälp av en värmeväxlare under denna omgång.
The consumption of chicken per inhabitant have increased in Sweden the last couple of years and today 23,2 kg is consumed per inhabitant and year. Because of this rise of Swedish chicken consumption, the awareness of investing in climate-smart alternatives have increased by the companies. The companies are decreasing the energy required during production, which ultimately leads to a reduced heating cost. The animal stall is heated by a boiler where water-based heating elements are providing the animal stall with heat along the walls. It has been considered problematic to heat up the animal stall by reintroducing the air from inside the stall due to the fact that this air often is too dusty, which contributes to blockage of filters and ducts. There are a number of different heat exchangers that can handle this kind of dust and particles today. Two different heat exchangers will be compared, a recuperative plate heat exchanger and a regenerative rotary heat exchanger. The animal stall must keep a low CO2 value and it is important to keep the chickens bedding dry by a low humidity inside the stall. The study shows that the total heat for one breeding round, which today is approximately 48,2MWh, which equals a saving by using an air heat exchanger of 24,8MWh. The result of the comparison of the two heat exchangers has shown that the regenerative (rotary) heat exchanger reintroduces moisture in the stall, which the recuperative (plate heat exchanger) does not. The follow up for this study was 34 days, from the chickens’ birth to the slaughter. During day 28-30 the animal stall becomes self-sufficient considering heat, which means that the heat exchanger could generate the heat required for the facility without the use of the stalls chip boiler. The study is implemented with a calculated volume flow due to a short outlet channel on the system, this can lead to a risk of a minor faulty value. Regard to the humidity in the stall, it is preferable to use a plate heat exchanger as the rotating heat exchanger precipitates water of 3 grams/kg of dry air.

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Chin-More-Chen und 陳慶謨. „The Performance Improvement of Refinery Rotary Sugar Dryer and Silo、GAC Regenerator Flue Gas Purification in a Sugar Refinery“. Thesis, 2004. http://ndltd.ncl.edu.tw/handle/75879192178584177607.

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碩士
國立屏東科技大學
機械工程系
92
The research is applying the power design of Dryer and Taguchi Methods[4]. The performance of rotary sugar dryer at the Hsiaokang Plant Sugar Refinery of Taiwan Sugar Corporation was improved. After operating conditions of the rotary dryer were revised, the sugar product met grain size quality standard and the sugar surface shines was improved. In additions, due to reducing sugar dust, both the refinery manufacturing cost reduction and the improvement of circumstances pollution of the refinery dryer were achieved. Additionally, the research work reported here provides additional theoretical knowledge about the wall stress distribution of the Packing Storage Hopper which installed inserts with different top half-angle[5]. Moreover, a circulating granular bed of GAC was applied to study the purification of GAC regenerator flue gas.

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Bücher zum Thema "Rotary regenerator"

Magnetic Refrigeration at Room Temperature : design, construction and evaluation of a reciprocating demonstrator and a rotary prototype : Numerical modelling and analysis of an active magnetic regenerator system. Prensas de la Universidad de Zaragoza, 2019.

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Buchteile zum Thema "Rotary regenerator"

Mahesh, S., B. Jayaraman und R. Madhumitha. „Analysis of Air-to-Air Rotary Regenerator for HVAC Systems Using CFD“. In Lecture Notes in Mechanical Engineering, 455–62. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1771-1_49.

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De Jin Luo und Arthur Williams. „EXPERIMENTAL STUDIES ON PRESSURE DROP AND EFFECTIVENESS OF A ROTARY HEAT REGENERATOR OF PARALLEL PLATE PASSAGES“. In Transport Phenomena in Heat and Mass Transfer, 516–26. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89851-7.50050-9.

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Konferenzberichte zum Thema "Rotary regenerator"

Bennhold, Florian, und David Gordon Wilson. „Thermal Gradients in Discontinuously Rotated Rotary Regenerative Heat Exchangers“. In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-60354.

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We present a numerical analysis of the thermal behavior of a high-temperature rotary regenerator with a cordierite heat-exchange matrix which is rotated in an indexed fashion. Such an “indexing regenerator” has recently been proposed as a novel high-temperature high-effectiveness heat-exchange solution for microturbines and other heat engines. Our simulations indicate significant differences in the patterns of thermal gradient development between the indexing regenerator and its continuously rotating siblings (e.g. the Ljundstrom air preheater). These features are crucial in understanding the thermal stresses in the regenerator matrix, which in turn will allow designers to increase the longevity and overall reliability of such devices. In addition to the numerical analysis, we have used thermal-imaging techniques to support our simulations and examine in-plane thermal conditions on the inlet and outlet surfaces of the regenerator disk. The principal result of our study is an understanding of the development of thermal gradients in the matrix of an indexed-rotation regenerator. This understanding is fundamental to thermal stress management in the design and operation of indexed regenerators. Analysis indicates that, for the same operating conditions, indexed-rotation regenerators develop lower thermal gradients than continuous rotation regenerators, and thus have the potential for greater reliability. Design recommendations are made from the simulation and experience with a prototype unit.

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No´brega, Carlos E. L., Ni´sio C. L. Brum und William Worek. „The Influence to Thermal Resistance to Conduction in Rotary Regenerators“. In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33909.

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The present work is devoted to the modeling of rotary regenerators. A mathematical model is proposed based on a number of simplifying assumptions, the validity of which is discussed in light of actual regenerator design figures. The results are presented in ε-NTU analysis. It is shown that the often neglected thermal resistance offered by the storage material might imply in substantial reduction on the regenerator effectiveness.

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Day, J. Paul. „A Rotary Heat Exchanger for Automotive and Other Ground Based Gas Turbines“. In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-124.

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This paper discusses the ongoing development of a ceramic regenerator for a high temperature automotive gas turbine engine sponsored by the U.S. Department of Energy. The ceramic gas turbine has a steady state gas inlet temperature of 774°C and a 982°C peak acceleration temperature which precludes the use of metallic discs. Ceramic materials have successfully operated to 982°C, with a peak acceleration temperature exceeding 1093°C. Ceramic regenerator temperature capability is currently limited by seal tribomaterial properties. The requirements of the ceramic regenerator, ceramic disc materials being evaluated, and the processing of these materials to obtain the required strength, chemical resistance, cost, including quality control are discussed. The status of the extruded regenerator program to date will also be described.

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Kluka, James Anthony, und David Gordon Wilson. „Low-Leakage Modular Regenerators for Gas-Turbine Engines“. In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-008.

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Wilson, David Gordon, und Teresa Baker. „Investigation Into the Use of Ceramic-Honeycomb Rotary Regenerators for Solar Brayton Cycles“. In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27216.

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It is conceptually possible to expose a third section of a rotary regenerator (in a gas turbine working on a heat-exchanger cycle) to a concentrated flux of solar radiation energy and thereby to supplement or even supplant the heat input from fuel (figure 1). Normally a regenerator in such a cycle has two sections: one in which the hot gases exhausting from the turbine section give up heat to the regenerator matrix, and one in which the air leaving the compressor passes through in the contrary direction, picking up heat from the matrix. The study reported here gives answers to concerns about the depth to which the solar energy would penetrate in a typical ceramic matrix, about the possibility of melting the top layers of the matrix if the solar energy is not aimed accurately, and about the amount of back radiation from the matrix to the environment that can be expected. It is concluded that the safe and efficient collection of solar energy in this way should be feasible.

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Jassim, Rahim K., Badr A. Habeebullah und Abdulraof S. Habeebullah. „Exergy Analysis of Carryover Leakage Irreversibilities of a Power Plant Regenerative Air Heater“. In 2002 International Joint Power Generation Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ijpgc2002-26102.

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Energy recovery devices can have substantial impact on process efficiency and their relevance to the problem of conservation of energy resources is generally recognised to be beyond dispute. One type of such a device, which is commonly used in fossil fired and air conditioning systems, is the rotary regenerator in which a stream of hot waste gas exchanges heat with fresh atmospheric air through the intermediate agency of a rotating matrix. As there are gas streams involved in the heat transfer and mixing processes, then there are irreversibilities, or exergy destruction, due to chemical reaction, pressure losses I˙ΔP and due to temperature gradients I˙ΔT . These principle components of total process irreversibility are not independent and there is a trade-off between them. Therefore the purpose of this research paper is to demonstrate the importance of the use of exergy analysis in the minimisation of carryover leakage irreversibilities of a symmetric balanced rotary regenerator. The chemical exergy E˙o and physical exergy E˙ph are calculated and the ratio of chemical and physical irreversibilities has been evaluated for a rotary regenerator used for air preheating in a coal-fired power plant. A numerical finite difference technique has been used to calculate the fluid and matrix temperature distributions effect on the regenerator performance. The effects of variation of the principal design parameters on the irreversibilities and on the regenerator effectiveness are examined and recommendations are made for the selection of the most appropriate parameters.

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Sang, Zhenkun, Xiaojing Lv, Zemin Bo und Yiwu Weng. „Investigation of Catalytic Combustion in the Rotary Regenerator Type Catalytic Combustor at Different Inlet Velocities“. In ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3414.

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Ultra low calorific value gas (ULCVG) is hard to be realized by the conventional combustion technology. Most of them are discarded into atmosphere directly, causing the inadvertent waste and serous pollution. Currently, a new type gas turbine with catalytic combustion and rotary regenerator can be used to utilize these fuels and mitigate pollution. Differing from the conventional gas turbine, the chamber and regenerator of the new gas turbine is combined into one component, which is named rotary recuperative type catalytic chamber (RRTCC). The catalytic combustion is applied for RRTCC. The catalytic combustion characteristic of RRTCC is studied using the computational fluid dynamics (CFD). The results indicate that when the inlet velocity is 20 m/s, the methane conversion rate is 90%∼95%, and the corresponding outlet gas temperature is 1030∼1200K. When there is a variation of ±25% in the inlet velocity, the variation of methane conversation rate is −15% and 5% respectively, and the variation of outlet gas temperature is −6% and 2% respectively. Additionally, it is found that the hotspot temperature of combustor wall decreases with the increase of inlet velocity. The lowest value of hotspot temperature is about 1000K, which is higher than the ignition temperature of CH4. Therefore, the existence of hotspot temperature is useful for the catalytic ignition. The temperature distribution on the combustion side exhibits a smoking-pipe-like shape, as well as the recuperative side. The results can provide data reference for RRTCC design.

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Wilson, David Gordon, Richard Gregory Frenkel, David Jude Kowalick, Harry Michael Nahatis, Seth Michael Silverstein und Luis Alberto Tampe. „Coal-Burning Exhaust-Heated-Cycle Gas Turbine With a Regenerative Heat Exchanger“. In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-342.

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A preliminary design study of four coal-burning gas-turbine engines using the exhaust-heated cycle and state-of-the-art components has been completed. In the exhaust-heated cycle the combustor takes air from the turbine exhaust and delivers hot combustion products to a heat exchanger. In the program reported here a rotary ceramic-matrix regenerator is used; in it the temperature of the compressor-delivery air is raised to that required at the turbine inlet. Some initial experiments on the flow of hot coal-combustion products through ceramic passages and of cold ash-laden air through a rotary ceramic-matrix regenerator have been conducted. Highly favorable results have been obtained on all aspects on which definite conclusions could be drawn.

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Kawasaki, Keiji, Tadaaki Matsuhisa, Itsuro Sakai und Kunio Hijikata. „Heat Transfer Characteristics of Rotating Ceramic Regenerators: Numerical Solution Using a Hybrid Finite Difference/Laplace Transform Scheme“. In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-371.

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A hybrid numerical method, combining finite differences with respect to space and a Laplace transform with respect to time, is proposed to determine the heat transfer in a rotary heat exchanger used as a rotating ceramic regenerator for automotive gas turbines. The temperature distributions of the core and of the working fluids are solved for given boundary and initial conditions of a rotary regenerator using this method. An advantage of the present method is that it can be applied when the core and the working fluids have dissimilar temperature distributions. The temperature change in the ceramic honeycomb core was determined from start up to periodic steady state operation. The heat exchanger effectiveness was obtained for an extruded ceramic core used in automotive gas turbine applications.

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Lewandowski, Thomas P., und Tah-Teh Yang. „A Procedure to Reduce the Effects of Variable Fluid Temperatures in the Flow Direction: Application to the Design of a Rotary Regenerator“. 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-130.

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The purpose of this paper is to present results of an analytical procedure which accounts for variations in temperature dependent fluid properties in the flow direction of a heat exchanger. The procedure is called the multi-element method and is used in the performance calculations of a rotary regenerator subject to axial temperature variations greater than 2:1. The multi-element method partitions the flow length and evaluates the heat exchanger by combining the performances of each length. The results show graphically the differences between using the multi-element method and a more commonly used single-element method. The differences presented are between the predicted regenerator disk thickness and between the predicted core pressure drop for a variety of operating conditions.

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