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Relevant bibliographies by topics / Recuperator

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Academic literature on the topic 'Recuperator'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 March 2023

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Journal articles on the topic "Recuperator"

1

Gil, S., J. Góral, P. Horňak, J. Ochman, and T. Wiśniewski. "Pressurized Recuperator For Heat Recovery In Industrial High Temperature Processes." Archives of Metallurgy and Materials 60, no. 3 (September 1, 2015): 1847–52. http://dx.doi.org/10.1515/amm-2015-0315.

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Abstract Recuperators and regenerators are important devices for heat recovery systems in technological lines of industrial processes and should have high air preheating temperature, low flow resistance and a long service life. The use of heat recovery systems is particularly important in high-temperature industrial processes (especially in metallurgy) where large amounts of thermal energy are lost to the environment. The article presents the process design for a high efficiency recuperator intended to work at high operating parameters: air pressure up to 1.2 MPa and temperature of heating up to 900°C. The results of thermal and gas-dynamic calculations were based on an algorithm developed for determination of the recuperation process parameters. The proposed technical solution of the recuperator and determined recuperation parameters ensure its operation under maximum temperature conditions.

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2

Vashchyshak, I. R., and Ye R. Dotsenko. "DESIGN OF THE RECUPERATOR ON PULSATING HEAT PIPES FOR OBJECTS OF THE OIL AND GAS COMPLEX." Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas, no. 2(45) (December 12, 2018): 16–23. http://dx.doi.org/10.31471/1993-9965-2018-2(45)-16-23.

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The urgency of work is due to the expediency of ventilation systems development for structures and buildings with highly reliable energy-efficient recuperators. The ventilation systems of buildings and designs of air recuperators were analyzed and it wass determined that the optimum variant for a ventilation system of a private house would be a recuperator on heat pipes. The disadvantages of wick heat pipes were presented. The structure and principle of pulsating heat pipes were considered. The recuperator operation principle of pulsating heat pipes was given. A coolant was selected for the recuperator capillary vessel. The heat exchanger characteristics were calculated for pulsating heat pipes. The house ventilation system with the recuperator on the pulsating heat pipes was designed.

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Li, Na, Xingfei Yu, Jinhai Xu, Qiuwang Wang, and Ting Ma. "Numerical study on thermoelectric-hydraulic performance of thermoelectric recuperator with wavy thermoelectric fins." High Temperatures-High Pressures 49, no. 5-6 (2020): 423–44. http://dx.doi.org/10.32908/hthp.v49.961.

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A thermoelectric-hydraulic numerical model is built for thermoelectric recuperators with wavy and straight fins under large longitudinal temperature difference, and their performance is analyzed. It is found that the comprehensive performance of the wavy-fin thermoelectric recuperator is better than that of straight-fin thermoelectric recuperator. The maximum output powers of the two thermoelectric recuperators are 0.251 mW and 0.236 mW at inlet velocity of 1.7 m � s-1. When the ratio of wave height to wave length is 0.1, the maximum output power is 0.251 mW and output power per unit volume is 414.8 W � m-3. Taguchi method is used to optimize the wavy-fin thermoelectric recuperator. It is found that reducing channel width and plate thickness is beneficial to increase the output power and output power per unit volume for the wavy-fin thermoelectric recuperator. Increasing fin height and fin thickness is beneficial to the output power, but disadvantage to the output power per unit volume.

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Utriainen, E., and B. Sunde´n. "Evaluation of the Cross Corrugated and Some Other Candidate Heat Transfer Surfaces for Microturbine Recuperators." Journal of Engineering for Gas Turbines and Power 124, no. 3 (June 19, 2002): 550–60. http://dx.doi.org/10.1115/1.1456093.

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To achieve high thermal efficiencies, 30 percent and higher, for small gas turbines a recuperator is mandatory. As the recuperator represents 25–30 percent of the overall machine cost, efforts are now being focused on establishing new low-cost recuperator concepts for gas turbine engines. In this paper the cross corrugated (CC), also called chevron pattern, heat transfer surface is reviewed to assess its thermal and hydraulic performance and compare it to some other candidate surfaces for a 50 kW microturbine. The surfaces may be categorized into three primary surface types and one plate-fin type. Design calculations of a recuperator heat transfer matrix using these surfaces enable direct comparison of the recuperator matrix volumes, weights and dimensions. It is concluded that the CC surface has great potential for use in recuperators of the future.

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Gautam, Yastuti Rao. "Review of Recuperator used in Micro Gas Turbine." International Journal for Research in Applied Science and Engineering Technology 9, no. VIII (August 15, 2021): 634–37. http://dx.doi.org/10.22214/ijraset.2021.36681.

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Micro gas turbines are an auspicious technology for power generation because of their small size, low pollution, low maintenance, high reliability and natural fuel used. Recuperator is vital requirement in micro gas turbine unit for improve the efficiency of micro turbine unit . Heat transfer and pressure drop characteristics are important for designing an efficient recuperator. Recuperators preheat compressed air by transfer heat from exhaust gas of turbines, thus reducing fuel consumption and improving the thermal efficiency of micro gas turbine unit from 16–20% to 30%. The fundamental principles for optimization design of PSR are light weight, low pressure loss and high heat-transfer between exhaust gas to compressed air. There is many type of recuperator used in micro gas turbine like Annular CWPS recuperator , recuperator with involute-profile element , honey well , swiss-Roll etc . In this review paper is doing study of Heat transfer and pressure drop characteristics of many types recuperator.

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Dinsing, Nicolas, Nico Schmitz, Christian Schubert, and Herbert Pfeifer. "Development of an Efficient Modelling Approach for Fin-Type Heat-Exchangers in Self-Recuperative Burners." Energies 14, no. 21 (October 20, 2021): 6873. http://dx.doi.org/10.3390/en14216873.

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Self-recuperative burners are a common solution for efficient combustion systems in industrial furnaces. Due to the geometric complexity of the recuperators, a detailed CFD simulation is computationally expensive and not feasible for simulation models of burner-integrated systems such as radiant tubes. Especially in the FSI studies of radiant tubes, the temperature of the radiant tube surrounding the burner is decisive for the final results. The exclusion of the recuperator from the simulation models introduces significant uncertainties in the simulations results. The presented paper describes an innovative, efficient approach to model a fin-type recuperator in which the recuperator is geometrically reduced. The resulting acceleration of the numerical simulation makes a fully dynamic modelling of the recuperator in a radiant tube simulation possible. Specifically designed source terms are used to model pressure loss and heat transfer inside the recuperator to match results obtained with a detailed simulation model. The results show deviations in total heat transfer of less than 1.3% with a 98.5% reduction of numerical mesh size. The computational savings enable comprehensive modelling of air preheat for radiant tube simulations and accurately replicate flow and temperature profiles in the recuperator.

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Knezevic, Suzana, Rade Karamarkovic, Vladan Karamarkovic, and Nenad Stojic. "Radiant recuperator modelling and design." Thermal Science 21, no. 2 (2017): 1119–34. http://dx.doi.org/10.2298/tsci160707232k.

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Recuperators are frequently used in glass production and metallurgical processes to preheat combustion air by heat exchange with high temperature flue gases. Mass and energy balances of a 15 m high, concurrent radiant recuperator used in a glass fiber production process are given. The balances are used: for validation of a cell modeling method that predicts the performance of different recuperator designs, and for finding a simple solution to improve the existing recuperator. Three possible solutions are analyzed: to use the existing recuperator as a countercurrent one, to add an extra cylinder over the existing construction, and to make a system that consists of a central pipe and two concentric annular ducts. In the latter, two air streams flow in opposite directions, whereas air in the inner annular passage flows concurrently or countercurrently to flue gases. Compared with the concurrent recuperator, the countercurrent has only one drawback: the interface temperature is higher at the bottom. The advantages are: lower interface temperature at the top where the material is under maximal load, higher efficiency, and smaller pressure drop. Both concurrent and countercurrent double pipe-in-pipe systems are only slightly more efficient than pure concurrent and countercurrent recuperators, respectively. Their advantages are smaller interface temperatures whereas the disadvantages are their costs and pressure drops. To implement these solutions, the average velocities should be: for flue gas around 5 m/s, for air in the first passage less than 2 m/s, and for air in the second passage more than 25 m/s.

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Borisov, I. I., and A. A. Khalatov. "THERMOPHYSICAL ANALYSIS OF THE PARAMETERS OF A BIOMASS FUELED MICRO–CHP UNIT WITH A STIRLING ENGINE." Thermophysics and Thermal Power Engineering 42, no. 4 (August 27, 2020): 26–32. http://dx.doi.org/10.31472/ttpe.4.2020.3.

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A typical scheme of a biomass fueled micro-CHP unit with a Stirling engine, including a combustion chamber, a Stirling Engine, a recuperator and water heater, is considered. A brief overview of the main biomass combustion methods used in this installation is made. Thermophysical analysis was carried out on the basis of solving a system of equations: the reaction equation for wood biomass combustion, the equations of both the general heat balance and the heat balance of parts of CHP unit, as well as the equation of energy conservation at flows mixing in the combustion chamber, taken into account the heat input and losses. The relationship for calculating the theoretical temperature in the combustion chamber and heat flux in the recuperatoris obtained. The last equation is obtained in dimensionless form. The theoretical temperature in the combustion chamber and the heat flux in the recuperator have been calculated, the influence of the main factors has been analyzed - the efficiency of heat exchange in the recuperator, the share of the total air flow passing through the recuperator, the excess air ratio, dimensionless heat losses and heat flux on the hot heat exchanger of the Stirling engine. It is shown that the temperature in the combustion chamber decreases with a decrease in the efficiency of the recuperator and with an increase in the excess air ratio. A significant influence of heat losses in the combustion chamber on the heat flux in therecuperatorwas found. Under certain conditions (high heat losses and high heat exchange on the hot heat exchanger of the Stirling engine), the recuperator is not neededatall. It is also shown that the share of the total air flow passing through the recuperator has a significant effect on the heat flux in the recuperator. Thus, when the air flow passing through the recuperator is reduced by 2 times, the heat flow is reduced by 5 times. Therefore, it is necessary to minimize the air flow bypassing the recuperator. As a result of thermophysical analysis, the optimal value of the excess air ratio was obtained, which is 1.7 ... 1.8.

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Hosseini, Seyed, Evan Owens, John Krohn, and James Leylek. "Experimental Investigation into the Effects of Thermal Recuperation on the Combustion Characteristics of a Non-Premixed Meso-Scale Vortex Combustor." Energies 11, no. 12 (December 4, 2018): 3390. http://dx.doi.org/10.3390/en11123390.

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In small-scale combustors, the ratio of area to the combustor volume increases and hence heat loss from the combustor’s wall is significantly enhanced and flame quenching occurs. To solve this problem, non-premixed vortex flow is employed to stabilize flames in a meso-scale combustion chamber to generate small-scale power or thrust for propulsion systems. In this experimental investigation, the effects of thermal recuperation on the characteristics of asymmetric non-premixed vortex combustion are studied. The exhaust gases temperature, emissions and the combustor wall temperature are measured to evaluate thermal and emitter efficiencies. The results illustrate that in both combustors (with/without thermal recuperator), by increasing the combustion air mass flowrate, the wall temperature increases while the wall temperature of combustor with thermal recuperator is higher. The emitter efficiency calculated based on the combustor wall temperature is significantly increased by using thermal recuperator. Thermal efficiency of the combustion system increases up to 10% when thermal recuperator is employed especially in moderate Reynolds numbers (combustion air flow rate is 120 mg/s).

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Bialik, Wojciech, Stanisław Gil, and Piotr Mocek. "High Temperature Recuperators Cooperating with a Metallurgical Furnace for Heating the Air Under Pressure." MATEC Web of Conferences 369 (2022): 03002. http://dx.doi.org/10.1051/matecconf/202236903002.

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In this paper, a system which uses hot furnace gases from a metallurgical process to heat compressed air necessary for another energy process is presented. The applied construction of the recuperator ensures high temperatures of the heated air needed for its utilisation in a separate process. Their levels depend on the processes in the reactor. A limitation to the construction of the installation is creep resistance of the materials used to assemble the recuperator modules which operate under high-temperature regimes. The well-prepared gas dynamic design of the recuperator ensured low pressure loss for the flowing air. Furnace gases leaving the recuperation system still have a high energy potential which can be utilised. As it is not possible to manage such large amounts of additional energy, the problem will be solved in the future when necessary.

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Dissertations / Theses on the topic "Recuperator"

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Pavlenko, V., and O. Volianyk. "Efficiency of window recuperator in residential premises." Thesis, Київський національний університет технологій та дизайну, 2019. https://er.knutd.edu.ua/handle/123456789/14631.

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RODRIGUES, DE CASTRO FELIPE. "Novel Axisymmetric Diffusion Bonded Recuperator for Gas Turbines." Doctoral thesis, Università degli studi di Genova, 2022. https://hdl.handle.net/11567/1102533.

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The small gas turbines systems, arbitrary categorized as microturbines (5-200 kW) and miniturbines (200-500 kW) are the current most economical solution for the distributed power generation market. The thermal efficiency of such microturbines without and with a recuperator is about 20 and 40% respectively, thus a recuperator is mandatory to reach higher cycle efficiencies. However, the recuperator accounts for about 25-30% of the turbine total cost and its temperature and pressure are constrained depending on the material and construction method, being the bottleneck of the improvement and advancement of this kind of power generation plant. Thus, the actual focus is to develop high performance recuperators able to withstand high temperatures and pressure at minimum cost. There are several different recuperators present on the market, each with their own heat transfer surface and manufacturing method, but all present drawbacks and are relatively old compared to the actual manufacturing methods. For instance, the rectangular offset strip fin geometry, which is one of the highest performance surfaces, is expensive to manufacture and weak to withstand temperature and pressure due to brazing requirements. Hence, in this thesis, a completely novel modular axisymmetric recuperator concept is proposed, joined by diffusion bonding technique, one of the current most advanced heat exchanger manufacturing methods. For the recuperator core, a novel heat transfer surface is proposed based in the rectangular offset strip fins, the thermal and hydraulic characteristics of which were determined experimentally. The devised heat transfer and pressure drop correlations show 85% agreement with the experimental data in the range of 500<3000. A code for the recuperator design, using entropy generation minimization, was developed to predict the recuperator performance and size the optimum recuperator core dimensions. The design code was validated with CFD which in turn was validated with experimental data. The heat transfer and pressure drop CFD results agreed the experimental data with deviation within 3.2% and 27.7%, respectively, and the design code agreed the CFD results with deviation within 0.9% and 11.9%, respectively. Four recuperator study cases for different turbine sizes, 100kW, 100kW_beta, 1250kW and 5000kW, were designed using the design code. The results show the proposed concept can achieve high effectiveness (~90%) with low pressure drop (<4%) with a volume compatible with the current recuperators. Furthermore, the novel recuperator concept has a list of advantages, which makes attractive its application on the future gas turbines, encouraging the research continuity of the proposed concept.

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Corbeil, Antoine. "Study of Small Hydraulic Diameter Media for Improved Heat Exchanger Compactness." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19837.

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Solar radiation offers phenomenal potential for energy conversion with energy densities on the order of 1000W/m2 in locations with regularly clear skies. As always, the difficulty lies in finding a solar-electric conversion technology capable of producing electricity at a competitive cost. The SolarCAT (Solar Compressed Air Turbine) system produces electricity by releasing stored compressed air through a series of turbines with solar dish concentrators providing the required heat for efficient conversion to electricity. To minimize impact on capital cost, high recuperator effectiveness targets are sought but unlike typical fuel-fired micro-turbines, raising the recuperator effectiveness of the solar power system yields a benefit in overall system capital cost. Improving efficiency lowers the size and cost of the largest element of the system, namely the dish. In this study potential techniques for achieving a highly compact heat-transfer media were reviewed. Folded fin, packed beds, micro-tubes, lattice frame structures, metal foams, woven textile, and micro-machining techniques were assessed. Textile structures were selected as an appropriate medium to replace the internal folded fin of the SolarCAT recuperator. The relatively long flow (>150mm) path through the proposed screen wafers requires a model for fully-developed forced convective flow between parallel plates. A mathematical model was developed by integrating the results from the work of several authors in the field of textiles and porous media. #100 mesh sintered screen wafers were brazed between two 0.25mm stainless steel sheets and destructively tested to assess their tensile strength. Although iii optimization of the braze parameters was not completed, it was found that many samples survived exposure to internal pressures in excess of 50MPa. This study found that the use of sintered screen wafers to replace the internal folded fin of the SolarCAT recuperator would have advantages over the current design with respect to both overall recuperator effectiveness, size, and cost. Textile structures can be tailored to have wide range of fluid and heat-transfer properties depending on the application. The manufacturing process is relatively simple and could be cost-effective for high-volume production.

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Koekemoer, Werner. "An investigation of the manufacturability of tungsten-copper for use in a compact recuperator / W. Koekemoer." Thesis, North-West University, 2008. http://hdl.handle.net/10394/4213.

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A substantial raise in recuperator effectiveness has been established in the past by improving the fabricating and joining configurations regarding the manufacturing of compact recuperators. Further advancement of state-of-the-art recuperators requires providing for increased temperatures and pressures. 1bis can only be achieved by incorporating high temperature materials into the recuperator design. Although many high temperature materials have been identified in past research, less of these can be utilized in new concepts due to difficulties regarding fabricating and joining. However recently, in an independent study, a tungsten-copper alloy was identified through detailed material selection methods as a suitable material for high temperature applications. The validity of tungsten-copper regarding fabricating and joining, to establish a leak tight structure still needs to be demonstrated. The aim of the study is to carry out a comprehensive review of existing recuperator technologies and design methodologies as well as to investigate the manufacturability of tungsten-copper for use in a recuperator design of limited size. More specifically, the objectives entail the following: (1) The comprehensive review of existing recuperator technologies and recuperator design methodologies, (2) The design and fabrication of a recuperator of limited size using tungsten-copper as a heat transfer material and (3) The determination of the feasibility of fabrication of the design and the applicability of the selected W -eu alloy in the design. The fabrication technique that is presented in the design entailed the use of 2.Irm tungsten carbide drill bits to machine the correct recuperator profile, while the recuperator unit was joined by utilizing a mechanical fastening system. Although diffusion bonding was initially identified as the ideal joining technique for the recuperator of this research, restrictions and limitations relating to the use of diffusion bonding has lead to the identification of a fastening system as the technique used. Evaluation of the fabricated recuperator revealed that several factors were outside the initially specified values, inter alia the flatness tolerance of recuperator plate geometries and machined slots precision. These factors contributed to a leaJdng recuperator structure when tested. The most likely contributing factors for the latter relate to non-conforming tolerances achieved in the fabricated design, residual stresses induced by the machining process as well as design issues relating to the recuperator plate geometries. The design and fabrication of a recuperator of limited size using tungsten-copper as a heat transfer material, requires re-evaluation. Similar work will ensure a design of a high quality when provision is made for advanced surface fmishing of machined parts (notably the recuperator plate geometries), slight modifications to the design as well as stress relieving of machined components for the purpose of eliminating any residual stresses thatJnight be present.
Thesis (M.Ing. (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2009.

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Carman, Bradley Gene. "Design of a high effectiveness ceramic micro-channel heat recuperator for micro-turbine application." Honors in the Major Thesis, University of Central Florida, 2002. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/262.

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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.
Bachelors
Engineering
Mechanical Engineering

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Dellar, Kyle Eric. "Clamped plate-style recuperator for a small-scale solar thermal brayton cycle using high-temperature sealant." Thesis, University of Pretoria, 2019. http://hdl.handle.net/2263/73467.

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South Africa is plagued by rolling blackouts, and many citizens do not have access to electricity or clean water. A personalised micro-turbine power generation system presents a solution to this issue and may become as commonplace as a personal computer. With South Africa’s excellent solar direct normal irradiation (DNI) levels, a small-scale recuperated solar thermal Brayton cycle (STBC) shows enormous potential. However, a recuperator comprises up to 30% of the capital cost associated with a micro-turbine package and requires complex and costly manufacturing methods within a South African context. Thus, the objective of this research is to investigate a clamped plate-style recuperator that can be cost-effectively manufactured locally. Literature was consulted and criteria were outlined that a recuperator in a Brayton cycle should adhere to. To uphold these requirements, a counterflow plate-style recuperator is mandatory, and to combat complex manufacturing methods, a gasketed stacked-plate design, which requires a gasket material, was proposed. A sodium silicate-based sealant called Soudal Calofer is available locally and can withstand the operating conditions of an STBC. Experimental testing was carried out successfully on two small-scale versions of the proposed recuperator design. Testing showed that the physical construction was simple and cost-effective and the clamped plate-style high-temperature sealant combination worked well to form the recuperator core, facilitating an easy assembly and disassembly process. The construction sustained an airtight seal (Mark I) for the entire testing period at various pressures and high temperatures. Despite the occurrence of heavy soot-based fouling deposits during Test 1 due to incomplete combustion of the LPG as a result of the very low air mass flow rates, a mathematical model was able to match the values gathered from the testing. The data showed a cold-side effectiveness of 58.6% and a total pressure loss of 17.78%. For Test 2, a cold-side effectiveness of 82.5% and a total pressure loss of 11.48% were found for the recuperator core, which also validated the mathematical model. A case study was performed for the small-scale STBC. The results showed that the combination of a cold-side effectiveness of 84% and a total pressure loss of less than 5% could be attained when implementing the recuperator within the STBC for a channel height of 1 mm and width of 50 mm. Alternatively, if pressure loss is of less concern, a cold-side effectiveness of 89% could be achieved by increasing the total pressure loss to 19 kPa, which equates to an 8.8% pressure loss. It is recommended that a large-scale recuperator be built and tested to confirm the performance characteristics of larger mass flow rates and that the insulation of the unit be varied to determine its effects. Gasket geometry and the assembly method also need to be further researched to develop a uniform and consistent assembly technique that results in an airtight seal for every unit assembled. This may be achieved by regulating the amount of water added to the Soudal Calofer for thinning purposes to achieve a consistency which facilitates uniform application and by extended drying time to allow for the assembly to be completed, while not thinning the sealant so much as to lead to a seal failure. In conjunction, the clamping force distribution is critical to sealing the inner channel division. It is also recommended that the usable lifespan of such a recuperator be determined. Most crucially, thermal and pressure cycling must be investigated, especially where seal integrity is concerned.
Dissertation (MSc)--University of Pretoria, 2019.
Mechanical and Aeronautical Engineering
MSc
Unrestricted

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Kovář, Radim. "Uzavřený oběh plynové turbiny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227952.

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Diploma thesis deals with the gas turbine closed cycle. The first part concerns the maximum of theoretical efficiency and practical excutable efficiency for the cycles without regeneration, cycles with regeneration and cycles with regeneration with split compression. The second part concerns the optimalization of the recuperator towards the speed of gas flow in the pipes of the recuperator. The third part includes weight and size design of two kinds of recuperators for different levels of regeneration.

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Hawn, David Phillip. "Development of a Dynamic Model of a Counterflow Compact Heat Exchanger for Simulation of the GT-MHR Recuperator using MATLAB and Simulink." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1236091152.

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Zhang, Chengyu [Verfasser], Volker [Akademischer Betreuer] Gümmer, Volker [Gutachter] Gümmer, and Harald [Gutachter] Klein. "Evaluation of the Potential of Recuperator on a 300-kW Turboshaft Helicopter Engine / Chengyu Zhang ; Gutachter: Volker Gümmer, Harald Klein ; Betreuer: Volker Gümmer." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1211725332/34.

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Siravičius, Vytautas. "Kombinuotų pašarų džiovinimo proceso tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120831_105530-15700.

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Šiuo metu populiariausias konservavimo būdas yra džiovinimas. Džiovinimas – tai technologinis procesas, kurio metu yra pašalinama iš produkto drėgmė, tokiu būdu prailginamas produkto tinkamumo laikas, tuo pačiu išlaikomos arba pagerinamos medžiagų savybės. Džiovinimo metu svarbiausia išlaikyti kokybę, kad džiovinamoje medžiagoje nepakistų pagrindinės medžiagų savybės. Ekstrudavimo procesas suintensyvina kombinuotųjų pašarų džiovinimo procesą. Magistrantūros darbo tikslas – ištirti ekstruduotų kombinuotų pašarų šunims džiovinimo procesą konvejerinėje džiovykloje. Atlikus informacijos šaltinių apžvalgą yra išanalizuotas džiovinimo procesas,džiovinimo būdai, džiovinimo proceso teoriniai pagrindai, šilumos rekuperatorių panaudojimo studija ir kombinuotų pašarų šunims procesas. Ekstruduotieji kombinuotieji pašarai konservuojami išgarinant perteklinę drėgmę konvejerinėje džiovykloje, sumažinant drėgnumą nuo 19,60 iki 8,51 %, kuris atitinka standarto reikalavimus. Džiovinant pašarus konvejerinėje džiovykloje buvo sunaudota 14000 kJ/kgvandens šilumos vienam kilogramui drėgmės išgarinti. Šilumos kiekis reikalingas džiovinimo procesui 654,48 kW. Nustatyta, kad rekuperatoriaus naudingumo koeficientai yra 72%. Šilumos kiekis reikalingas džiovinimo procesui 654,48 kW. Rekuperatorimi konpensuojamos grąžinamos šilumos kiekis yra 471,50 kW.
Currently drying is the most popular conservation method. Drying is a technological process, which removes moisture from the product, in this way the shelf life of the product is extended, at the same time the properties of materials are maintained or upgraded. It is important to maintain the quality in the process of drying in order to avoid unwanted changes of main characteristics of the drying material. The aim of master thesis is to explore drying process in conveyor dryer for the extruded combined feed for dogs. The analysis of the material data was performed specific attention paying to the process of drying, the methods of drying, theoretical background of drying, the study of the heat recuperator use and the process of combined feed for dogs. Extruded combined feed in conveyor dryer is preserved by evaporating excess moisture, the moisture is reduced from 19,60 to 8,51%, which complies with the requirements of the standard. For the feed drying the amount of heat to evaporate one kilogram of water in the conveyor dryer is 14000 kJ/kgH2O. The quantity of heat needed for the drying process is 654,48 kW. It was established that the efficiency units of recuperator are 72 %. The quantity of heat needed for the drying process is 654,48 kW. Compensated returned heat amount in recuperator is 471,50 kW.

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Books on the topic "Recuperator"

1

Canada. Energy, Mines and Resources Canada., Manitoba. Dept. of Energy and Mines., AMCA International Limited, and Manitoba Rolling Mills, eds. Waste heat recuperator, Manitoba Rolling Mills. [Ottawa]: Energy, Mines and Resources Canada, 1985.

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New York State Energy Research and Development Authority. and Tecogen Inc, eds. Demonstration of a long-life radiant recuperator for the secondary aluminum industry: Final report. Albany, N.Y: The Authority, 1987.

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Cunqueiro, Alvaro. Escritos recuperados. [Santiago de Compostela, Spain]: Universidade de Santiago de Compostela, Departamento de Filoloxía Galega, 1991.

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Santos, Pascual López. Poemas recuperados. Madrid: Verbum, 1992.

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Arantes, Quito. O recuperador de tempo. Porto]: Tecto de Nuvens, 2012.

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Tempo recuperado. Lisboa: [s.n.], 1985.

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Cîrstea, Cornelia. Romantismul recuperat. Craiova: Scrisul Românesc, 2003.

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Fieled, Adam. Excavation and Recuperation. San Francisco, Ca: Internet Archive, 2013.

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A, Simeone, ed. Il Carteggio Recuperato: (1894-1922). Lanciano,Italia: Casa Editrice Rocco Carabba, 2009.

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Roberto, Scannavini, and Ciabatti Mario, eds. San Giovanni in Monte recuperato. Bologna: Grafis, 1996.

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Book chapters on the topic "Recuperator"

1

Kong, Qiao-ling, Zhi-guo Dang, Guang-di Xu, Chuang Gao, and Wei-guang Huang. "Recuperator Concept Design of Low-Emission 2-MW Gas Turbine." In Low-carbon City and New-type Urbanization, 203–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45969-0_18.

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van Limpt, Hans, and Ruud Beerkens. "Energy Recovery from Waste Heat in the Glass Industry and Thermochemical Recuperator." In 73rd Conference on Glass Problems, 1–15. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118710838.ch1.

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Gladston, Paul. "Silence and Recuperation." In Chinese Contemporary Art Series, 83–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46488-5_8.

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Larrabure, Manuel. "Argentina's Worker Recuperated Enterprises." In The Latin American Crisis and the New Authoritarian State, 67–87. London: Routledge, 2022. http://dx.doi.org/10.4324/9781003155836-5.

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Levenspiel, Octave. "Recuperators: Through-the-Wall Nonstoring Exchangers." In Engineering Flow and Heat Exchange, 261–303. Boston, MA: Springer US, 2014. http://dx.doi.org/10.1007/978-1-4899-7454-9_13.

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Schobeiri, Meinhard T. "Modeling of Recuperators, Combustion Chambers, Afterburners." In Turbomachinery Flow Physics and Dynamic Performance, 367–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24675-3_15.

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Schobeiri, Meinhard T. "Modeling of Recuperators, Combustion Chambers, Afterburners." In Gas Turbine Design, Components and System Design Integration, 353–68. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58378-5_14.

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Gulay, Bohdan, Iryna Sukholova, Oleksandra Dzeryn, and Volodymyr Shepitchak. "Investigations of Compact Recuperators Acoustic Properties." In Lecture Notes in Civil Engineering, 127–33. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57340-9_16.

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Levenspiel, Octave. "Recuperators: Through-The-Wall Nonstoring Exchangers." In The Plenum Chemical Engineering Series, 251–96. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4899-0104-0_13.

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Schobeiri, Meinhard T. "Modeling of Recuperators, Combustion Chambers, Afterburners." In Gas Turbine Design, Components and System Design Integration, 355–70. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23973-2_14.

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Conference papers on the topic "Recuperator"

1

Salpingidou, Christina, Dimitrios Misirlis, Zinon Vlahostergios, Michael Flouros, Fabian Donus, and Kyros Yakinthos. "Design Optimization of Heat Exchangers for Aero Engines With the Use of a Surrogate Model Incorporating Performance Characteristics and Geometrical Constraints." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76097.

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The present work is focused on the optimization of the performance characteristics of a recuperator specifically designed for aero engine applications, targeting the reduction of specific fuel consumption and taking into consideration aero engine geometrical constraints and limitations. The recuperator design was based on the elliptically profiled tubular heat exchanger which was developed and invented by MTU Aero Engines AG. For the specific fuel consumption investigations the Intercooled Recuperated Aero engine cycle, combining both intercooling and recuperation, was considered. The optimization was performed with the development of a recuperator surrogate model, capable to incorporate major recuperator geometrical features. A large number of recuperator design scenarios was assessed, in which additional design criteria and constraints were applied. Thus, a significantly large recuperator design space was covered resulting to the identification of feasible recuperator designs providing beneficial effect on the Intercooled Recuperated Aero engine leading to reduced specific fuel consumption and weight.

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Salpingidou, Christina, Zinon Vlahostergios, Dimitrios Misirlis, Michael Flouros, Fabian Donus, and Kyros Yakinthos. "Investigation and Assessment of the Performance of Various Recuperative Cycles Based on the Intercooled Recuperation Concept." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76778.

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This work is focused on investigations of Intercooled Recuperation configurations for aero engines. The investigated configurations were the Conventional Recuperation, where the recuperator was placed downstream the low-pressure turbine (LPT), the Alternative Recuperation, where the recuperator was mounted between the intermediate pressure turbine (IPT) and LPT, and the Staged Heat Recovery concept, in which two recuperators were mounted, one between IPT and LPT and the other downstream the LPT. These concepts were further assessed with the use of an additional combustor between IPT and LPT. All recuperator concepts that have been developed within the framework of various research projects by Aristotle University of Thessaloniki and MTU Aero engines AG were utilized, named as the NEWAC, CORN and STARTREC concepts. Additionally, a new recuperator design was introduced using a secondary fluid as heat transfer medium. The configurations thermodynamic assessment was focused on specific fuel consumption reduction, while the configurations effect on NOx emissions was also investigated. The results showed that the most promising recuperator concept, with respect to low TSFC values compared with a reference GTF engine of 2050 year technology level, is the recuperator with the secondary fluid heat transfer medium.

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Kesseli, James, Thomas Wolf, James Nash, and Steven Freedman. "Micro, Industrial, and Advanced Gas Turbines Employing Recuperators." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38938.

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Recuperators increase system efficiencies in gas turbine engines by recovering exhaust heat to the compressor discharge stream. In this study, the performance and economics of recuperation are evaluated and presented for a practical range of effectiveness with typical pressure-loss-fractions. The strong correlation between recuperator cost and engine specific-power is shown, using a recuperator designed and manufactured at a highly automated facility by Ingersoll-Rand. This commercially available recuperator is also described, with specific emphasis on features contributing to its exceptional durability.

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McDonald, Colin F. "Emergence of Recuperated Gas Turbines for Power Generation." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-067.

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In the emerging deployment of microturbines (25–75Kw), a recuperator is mandatory to achieve thermal efficiencies of 30 percent and higher, this being important if they are to successfully penentrate the market currently dominated by Diesel generator sets. This will be the first application of gas turbines for electrical power generation, where recuperators will be used in significant quantities. The experience gained with these machines will give users’ confidence that recuperated engines will meet performance and reliability goals. The latter point is particularly important, since recuperated gas turbines have not been widely deployed for power generation, and early variants were a disappointment. Recuperator technology transfer to larger engines will see the introduction of advanced heat exchanged industrial gas turbines for power generation in the 3–15 Mw range. After many decades of development, existing recuperators of both primary surface and plate-fin types, have demonstrated acceptable thermal performance and integrity in the cyclic gas turbine environment, but their capital costs are high. A near-term challenge to recuperator design and manufacturing engineers is to establish lower cost metallic heat exchangers that can be manufactured using high volume production methods. A longer term goal will be the development and utilization of a ceramic recuperator, since this is the key component to realize the full performance potential of very small and medium size gas turbines.

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Sanders, Robert C., and George C. Louie. "Development of the WR-21 Gas Turbine Recuperator." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-314.

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WR-21 is an intercooled and recuperated (ICR) gas turbine engine being developed by the U. S. Navy (USN) with contributions from the Royal Navy and the French Navy. A key component of the WR-21 engine is the recuperator used to recover waste heat from engine exhaust gas. The recuperator is being designed and fabricated by AlliedSignal Aerospace Company under subcontract to Northrop Grumman Marine Services, the prime contractor for the WR-21 gas turbine engine. One of the most challenging developmental items for the WR-21 engine has proven to be the recuperator. This paper discusses the development of the recuperator, including the advanced development (AD) recuperator which failed after a few hours of operation, the limited operating unit (LOU) recuperator which has supported much of the WR-21 engine development testing and the engineering development model (EDM) recuperator which will be used for a 3000 hour engine endurance test. Included is an overview of USN technical requirements for the recuperator and a review of operating experience with the AD and LOU recuperators. Failure modes that have been experienced are discussed in detail, including root cause evaluations and design modifications. Steps taken to extend the life of the LOU recuperator are discussed. In addition, testing (both single core and full size recuperator) and analytical models that have been used to improve the design and reliability of the recuperator are addressed.

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Zhang, Chengyu, Martin Kerler, and Volker Gümmer. "Evaluation of the Fuel Saving Potential Regarding Recuperated Helicopter Flight Conditions." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75637.

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Incorporating recuperators into turbine engines which enables the heat transfer between exhaust gas and compressed air, indicates considerable potential for lower emissions and SFC (specific fuel consumption). However as a matter of fact, they have not yet found wide acceptance in aircraft applications. One of the main potential disadvantages is because in such situations system overall weight needs to be strictly controlled, and there are concerns that the beneficial fuel saving may not offset the additional bulk and weight of the recuperator. In this work, aimed at evaluating the performance of the recuperated rotorcraft and investigating the influence of a recupeator on the whole system, a comprehensive simulation framework has been developed which mainly contains three modules for various flight conditions: Helicopter performance module (HPM), GasTurb engine simulation module and the recuperator weight estimation. Specifically, HPM calculates the helicopter power requirement for different flight conditions (altitude, speed, etc.), and GasTurb is used to simulate the performance of conventional and recuperated turbine engine, and compute the corresponding engine operating point to meet the power demand. The recuperator weight estimation is mainly based on previous studies as a function of mass flow and effectiveness. The methodology is adopted for a typical twin engine light helicopter configuration. In comparison with the conventional non-recuperated cycle, the authors studied the fuel saving potential of the recuperated cycle for different recuperator effectiveness under various flight conditions, and a trade-off analysis was also conducted to identify the flight time required to compensate the additional recuperator weight. The obtained results suggested that the recuperated cycle possesses great potential, especially for long duration and large range mission, but it may not be necessarily suitable for all types of helicopter missions.

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Ferrari, Mario L., Matteo Pascenti, Loredana Magistri, and Aristide F. Massardo. "Micro Gas Turbine Recuperator: Steady-State and Transient Experimental Investigation." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59172.

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The aim of this work is the experimental analysis of a primary-surface recuperator operating in a 100 kW micro gas turbine, as in a standard recuperated cycle. These tests, performed in both steady-state and transient conditions, have been carried out using the micro gas turbine test rig developed by TPG at the University of Genoa, Italy. Even if this facility has mainly been designed for hybrid system emulations, it is possible to exploit the plant for component tests, such as experimental studies on recuperators. The valves installed in the rig make it possible to operate the plant in the standard recuperated configuration, and the facility has been equipped with new probes essential for this kind of tests. A wide-ranging analysis of the recuperator performance has been carried out with the machine operating in stand-alone configuration, or connected to the electrical grid, to test different control strategy influences. Particular attention has been given to tests performed at different electrical load values and with different mass flow rates through the recuperator ducts. The final section of this paper reports the transient analysis carried out on this recuperator. The attention is mainly focused on thermal transient performance of the component, showing the effects of both temperature and flow steps.

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Oswald, James I., David A. Dawson, and Lee A. Clawley. "A New Durable Gas Turbine Recuperator." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-369.

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A new recuperator has been developed at Rolls-Royce, specifically designed to address the problems recuperators traditionally experience in withstanding thermal cycling and high cost associated with production complexity. Unlike existing recuperators it is made from two continuous sheets of metal wound into a spiral form. It is believed to be the only recuperator in the world manufactured as a continuous process and therefore has inherently lower cost. A significant increase in thermal fatigue resistance relative to state of the art recuperators is achieved due to the compliant structure and careful design of the heat exchanger matrix. A technology acquisition programme has been carried out which has involved the design, manufacture and rig testing of recuperator cores. The success of the work is now leading to the continuation of the programme to address the application of this technology to specific engine developments from microturbines of 40kW to large industrial and marine turbines of 20MW.

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Wang, Q. W., H. X. Liang, L. Q. Luo, J. W. Wang, Z. P. Huang, Z. P. Feng, and Z. Q. Chen. "Experimental Investigation on Heat Transfer and Pressure Drop in a Microtubine Recuperator With Cross-Wavy Primary Surface Channels." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68255.

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Compact heat exchangers are used in a wide variety of applications. Typical utilization is a low-cost recuperator for power generation microturbines. In this scenario, a recuperator takes heat from the exhaust gas and preheats the compressor discharge air before it reaches the combustion chamber. To achieve thermal efficiency over 30%, recuperators with high thermal performance surfaces geometries are needed. It has been shown that Cross-Wavy Primary Surface (CWPS) has superior performance and high commercial potential in compact recuperators based on previous studies. In the present study, we successfully implemented a prototype recuperator with CWPS channels for a 100kW microturbine. The material we used in the recuperator core is a 0.12mm-thick stainless steel strip, which has good high-temperature mechanical and corrosion properties. The working mediums are compressed air and hot gas for the two sides of the recuperator. We tested comprehensively the thermal performance of the recuperator in terms of the overall heat transfer coefficients and friction factors vs. Reynolds numbers in the CWPS channels, with Reynolds number ranging from 250 to 400. The exhaust hot gas temperature was much non-uniform, indicating the importance of flow arrangement when designing the recuperator. We also investigated the heat transfer coefficients and friction factors vs. Reynolds numbers, and obtained corresponding correlations.

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Stephenson, Michael D., Mike E. Ward, and Len Holman. "Operation of a Primary Surface Recuperator on a Liquid Fueled Combustion System." 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-360.

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Gas turbine recuperators have been put in operation in a number of applications, although the experience on liquid fuel has been minimal. Possibilities of liquid fouling of the compact surfaces of recuperators has been a significant concern. A extended duration fouling test of a compact recuperator was conducted using a simulated gas turbine exhaust stream from a commercial dry low NOx atmospheric combustion system. This combustion system has consistently demonstrated operation with negligible smoke and low NOx emissions. The low smoke significantly reduces the likelihood of fouling of downstream equipment. Fouling of the recuperator was virtually undetectable after 1000 hours of operation. Visual inspection of the recuperator core confirmed there was no soot buildup of any kind.

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Reports on the topic "Recuperator"

1

Omatete, O. O. Assessment of Recuperator Materials for Microturbines. Office of Scientific and Technical Information (OSTI), January 2001. http://dx.doi.org/10.2172/777668.

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Parks, Jr., W., and C. DeBellis. High temperature burner-duct-recuperator system evaluation. Office of Scientific and Technical Information (OSTI), August 1989. http://dx.doi.org/10.2172/5685836.

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Gonzalez, J. M., J. L. Ferri, and W. J. Rebello. Industrial operating experience of the GTE ceramic recuperator. Office of Scientific and Technical Information (OSTI), June 1990. http://dx.doi.org/10.2172/6516673.

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Swindeman, R. W. Evaluation of Stainless Steels for Primary Surface Recuperator Applications. Office of Scientific and Technical Information (OSTI), February 2001. http://dx.doi.org/10.2172/777679.

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Gonzalez, J. M. Development of a zirconia-mullite based ceramic for recuperator applications. Office of Scientific and Technical Information (OSTI), December 1992. http://dx.doi.org/10.2172/6403322.

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RA Wolf. Carbon-Carbon Composites as Recuperator Material for Direct Gas Brayton Systems. Office of Scientific and Technical Information (OSTI), July 2006. http://dx.doi.org/10.2172/884666.

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Lukas, Michael. Development of a Microchannel High Temperature Recuperator for Fuel Cell Systems. Office of Scientific and Technical Information (OSTI), March 2014. http://dx.doi.org/10.2172/1330182.

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Escola, George. Cooperative Research and Development of Primary Surface Recuperator for Advanced Microturbine Systems. Office of Scientific and Technical Information (OSTI), January 2007. http://dx.doi.org/10.2172/926171.

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Federer, J. I., T. N. Tiegs, D. M. Kotchick, and D. Petrak. Analysis of candidate silicon carbide recuperator materials exposed to industrial furnace environments. Office of Scientific and Technical Information (OSTI), July 1985. http://dx.doi.org/10.2172/5275519.

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Ermanoski, Ivan, and Adrian Orozco. C2R2. Compact Compound Recirculator/Recuperator for Renewable Energy and Energy Efficient Thermochemical Processing. Office of Scientific and Technical Information (OSTI), August 2015. http://dx.doi.org/10.2172/1221860.

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