Journal articles: '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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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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9

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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10

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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11

Volianska, N. "MODELING OF A DOUBLE CIRCULATION RECUPERATOR’S HEAT WORK." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 1, no. 38 (September 8, 2021): 106–15. http://dx.doi.org/10.31319/2519-2884.38.2021.13.

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Utilization of heat from waste products of heat units’ combustion is one of the most important means of saving fuel and energy resources and improving the environmental performance of the enterprise. Improving the design of heat recuperators and increasing their energy efficiency by improving thermal performance is based primarily on the development of new and improvement of existing methods for calculating heat exchangers. In this paper, based on the method of elementary heat balances, a mathematical model of the thermal operation of a double-circulation recuperator is developed. The use of the described mathematical model of recuperator’s heat work makes it possible to analyze its design in terms of energy efficiency, durability, the ability to reduce heat emissions into the environment.

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12

Vitalii, Tauger, Minin Ivan, and Adas Vitalii. "Calculating the optimal physical size of an industrial plate recuperator." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 6 (September 24, 2020): 95–101. http://dx.doi.org/10.21440/0536-1028-2020-6-95-101.

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Introduction. The wide spread of plate heat exchangers in various fields of technology is due to the simplicity of their design and a variety of layout schemes. An area where their use is very promising is heat recovery. The effect of an air heat exchanger-recuperator consists in heating the incoming flow with the heat of the outgoing flow and is expressed in drastically reduced power consumption, which would otherwise be spent on heating. Research methodology. The object of research is a recuperator designed to heat the air entering the production room in winter. Resistance to air flow is a significant disadvantage of the plate heat exchange. The aerodynamic resistance reduces the flow rate, therefore, leads to a decrease in the flow rate of air passing through the recuperator, so the required flow rate is ensured by special fan installations. The task of designing a recuperator is to minimize the size of the flow part and prevent excessive load on the fan unit. Calculation with the use of the recuperatorТs mathematical model is applied in the research. Results. In the course of the research, a mathematical model of the recuperator has been developed, which includes a condition for limiting the pressure loss by an acceptable value. Ratios have been obtained for determining the optimal duct width between the plates, plates height, length and number. Conclusion. A simplified mathematical model has been proposed to estimate the dimensions of the flow part. The reliability of the simplified model has been confirmed by numerical calculation.

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13

McDonald, Colin F. "Gas turbine recuperator renaissance." Heat Recovery Systems and CHP 10, no. 1 (January 1990): 1–30. http://dx.doi.org/10.1016/0890-4332(90)90246-g.

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14

Maghsoudi, Peyman, Sadegh Sadeghi, Qingang Xiong, and Saiied Mostafa Aminossadati. "A multi-factor methodology for evaluation and optimization of plate-fin recuperators for micro gas turbine applications considering payback period as universal objective function." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 5 (July 19, 2019): 2411–38. http://dx.doi.org/10.1108/hff-04-2019-0333.

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Purpose Because of the appreciable application of heat recovery systems for the increment of overall efficiency of micro gas turbines, promising evaluation and optimization are crucial. This paper aims to propose a multi-factor theoretical methodology for analysis, optimization and comparison of potential plate-fin recuperators incorporated into micro gas turbines. Energetic, exergetic, economic and environmental factors are covered. Design/methodology/approach To demonstrate applicability and reliability of the methodology, detailed thermo-hydraulic analysis, sensitivity analysis and optimization are conducted on the recuperators with louver and offset-strip fins using a genetic algorithm. To assess the relationship between investment cost and profit for the recuperated systems, payback period (PBP), which incorporates all the factors is used as the universal objective function. To compare the performance of the recuperated and non-recuperated systems, exergy efficiency, exergy destruction and corresponding cost rate, fuel consumption and environmental damage cost rates, capital and operational cost rates and acquired profit rates are determined. Findings Based on the results, optimal PBP of the louvered-fin recuperator (147 days) is slightly lower than that with offset-strip fins (153 days). The highest profit rate is acquired by reduction of exergy destruction cost rate and corresponding decrements for louver and offset-strip fins are 2.3 and 3.9 times compared to simple cycle, respectively. Originality/value This mathematical study, for the first time, focuses on introducing a reliable methodology, which covers energetic, exergetic, economic and environmental points of view beneficial for design and selection of efficient plate-fin recuperators for micro gas turbine applications.

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Olabin, V. M., O. B. Maksymuk, S. P. Trukhan, and I. V. Nikitina. "RECUPERATORS OF MELTING BUBBLING FURNACES." Energy Technologies & Resource Saving, no. 3 (September 20, 2017): 63–68. http://dx.doi.org/10.33070/etars.3.2017.08.

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Information on the use of tubular radiation recuperators on melting bubble furnaces is presented. The reasons that subsequently affect deterioration of the recuperators performance have been analyzed. New structure of the recuperators, in which a hanging top collector with a counterweight and appropriate loop-type expansion joints are applied to prevent uncontrolled deformation of heat-receiving pipes, have been designed based on the analysis of the operation of recuperators of melting bubbling furnaces. New design allows to increase efficiency of the recuperator application, cleaning and repair of the pipes are possible without dismantling of the stack brick work. Bibl. 6, Fig. 5, Tab. 2.

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Gui, Xiaohong, Xiange Song, Haiwen Gong, Dianbao Yao, Ruogu Chen, and Guang Xu. "Finite Element Analysis of Stress on Cross-Wavy Primary Surface Recuperator Based on Thermal-Structural Coupling Model." Advances in Materials Science and Engineering 2021 (February 11, 2021): 1–9. http://dx.doi.org/10.1155/2021/9604371.

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In order to study the stress, strain and deformation of the recuperator, the thermal-structural coupling finite element analysis model of cross-wavy primary surface recuperator of gas microturbine was established. The stress of cross-wavy primary surface recuperator after operation under design conditions was analyzed by finite element method. The reliability of the material selected for the recuperator was verified, and the effects of pressure ratio and gas inlet temperature on stress and displacement of the recuperator were analyzed. The research results show that the maximum stress and strain on the gas outlet side of the recuperator are higher than the maximum stress and strain on the gas inlet side when only pressure is considered, and the result is the opposite when pressure and thermal stress are considered. The air passage of the recuperator deforms to the side of the gas passage, the air passage becomes larger, and the gas passage shrinks. With the increase of pressure ratio between air side and gas side, the maximum stress of recuperator passage also increases. When the pressure ratio increases to 8.4, the strength limit of the heat exchange fin material is reached. When the gas and air outlet temperatures remain unchanged and the thermal ratio decreases, as the gas inlet temperature increases, the maximum stress increases. For every 50 K increase in the gas inlet temperature, the maximum stress of the recuperator increases by about 2.3 MPa. The research results can be used to guide the designing and optimization of recuperator.

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Schoenenborn, Harald, Ernst Ebert, Burkhard Simon, and Paul Storm. "Thermomechanical Design of a Heat Exchanger for a Recuperative Aeroengine." Journal of Engineering for Gas Turbines and Power 128, no. 4 (September 18, 2006): 736–44. http://dx.doi.org/10.1115/1.1850510.

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Within the framework programs of the EU for Efficient and Environmentally Friendly Aero-Engines (EEFEA) MTU has developed a highly efficient cross-counter flow heat exchanger for the application in intercooled recuperated aeroengines. This very compact recuperator is based on the profile tube matrix arrangement invented by MTU and one of its outstanding features is the high resistance to thermal gradients. In this paper the combined thermomechanical design of the recuperator is presented. State-of-the-art calculation procedures for heat transfer and stress analysis are combined in order to perform a reliable life prediction of the recuperator. The thermal analysis is based upon a 3D parametric finite element model generation. A program has been generated, which allows the automatic generation of both the material mesh and the boundary conditions. Assumptions concerning the boundary conditions are presented as well as steady state and transient temperature results. The stress analysis is performed with a FEM code using essentially the same computational grid as the thermal analysis. With the static temperature fields the static loading of the profile tubes is determined. From transient thermal calculations successive 3D temperature fields are obtained which enable the determination of creep life and LCF life of the part. Finally, vibration analysis is performed in order to estimate the vibration stress of the profile tubes during engine operation. Together with the static stress a Goodman diagram can be constructed. The combined analysis shows the high life potential of the recuperator, which is important for economic operation of a recuperative aero-engine.

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Pelevin, F. V., A. V. Ponomarev, and I. V. Lokhanov. "Two-circuit recupertive heat exchanger with interchannel motion of the coolant in metallic mesh." Proceedings of Higher Educational Institutions. Маchine Building, no. 9 (750) (September 2022): 83–91. http://dx.doi.org/10.18698/0536-1044-2022-9-83-91.

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The paper considers a dual-circuit recuperator using the principle of interchannel movement of coolant through a porous metal mesh. This interchannel coolant movement schematic and the metal mesh manufactured via vacuum diffusion welding of woven metal meshes form the basis for developing compact high-performance recuperators for aircraft. Employing porous metal mesh materials characterised by a well-developed heat exchange surface and transitioning from conventional longitudinal coolant movement within channels to interchannel coolant movement through metal meshes are the factors that ensure operation at low Reynolds numbers and maximum heat exchange efficiency. The principle of interchannel coolant movement combined with the intermesh coolant movement within the metal mesh yields a highly efficient porous heat exchange path, leading in turn to developing a recuperator featuring interchannel coolant movement that will enable greater heat exchange efficiency than that provided by the best finned heat exchangers.

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Adamski, Mariusz. "Ventilation system with spiral recuperator." Energy and Buildings 42, no. 5 (May 2010): 674–77. http://dx.doi.org/10.1016/j.enbuild.2009.11.005.

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Maziasz, P. J., and R. W. Swindeman. "Selecting and Developing Advanced Alloys for Creep-Resistance for Microturbine Recuperator Applications1." Journal of Engineering for Gas Turbines and Power 125, no. 1 (December 27, 2002): 310–15. http://dx.doi.org/10.1115/1.1499729.

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Recuperators are considered essential hardware to achieve the efficiencies desired for advanced microturbines. Compact recuperator technologies, including primary surface, plate and fin, and spiral, all require thin section materials that have high-temperature strength and corrosion resistance up to 750°C or above, and yet remain as low cost as possible. The effects of processing and microstructure on creep-rupture resistance at 750°C and 100 MPa were determined for a range of austenitic stainless alloys made into 0.1-mm foils. Two groups of alloys were identified with regard to improved creep resistance relative to type 347 stainless steel. Alloys with better creep-rupture resistance included alloys 120, 230, modified 803 and alloy 740 (formerly thermie-alloy), while alloy 214 and 625 exhibited much better creep strength. Alloys 120 and modified 803 appeared to have the most cost-effective improvements in creep strength relative to type 347 stainless steel, and should be attractive for advanced microturbine recuperator applications.

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Picard, Benoit, Mathieu Picard, Jean-Sébastien Plante, and David Rancourt. "Optimum sub-megawatt electric-hybrid power source selection." Aircraft Engineering and Aerospace Technology 92, no. 5 (March 23, 2020): 717–26. http://dx.doi.org/10.1108/aeat-06-2019-0119.

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Purpose The limited energy density of batteries generates the need for high-performance power sources for emerging eVTOL applications with radical operational improvement potential over traditional aircraft. This paper aims to evaluate on-design and off-design recuperated turbogenerator performances based on newly developed compression loaded ceramic turbines, the Inside-out Ceramic Turbine (ICT), in order to select the optimum engine configuration for sub-megawatt systems. Design/methodology/approach System-level thermal engine modeling is combined with electric generators and power electronics performance predictions to obtain the Pareto front between efficiency and power density for a variety of engine designs, both for recuperated and simple cycle turbines. Part load efficiency for those engines are evaluated, and the results are used for an engine selection based on a simplified eVTOL mission capability. Findings By operating with high turbine inlet temperature, variable output speed and adequately sized recuperator, a turbogenerator provides exceptional efficiency at both nominal power and part load operation for a turbomachine, while maintaining the high power density required for aircraft. In application with a high peak-to-cruise power ratio, such power source would provide eight times the range of battery-electric power pack and an 80% improvement over the state-of-the-art simple cycle turbogenerator. Practical implications The implementation of a recuperator would provide additional gains especially important for military and on-demand mobility applications, notably reducing the heat signature and noise of the system. The engine low-pressure ratio reduces its complexity and combined with the fuel savings, the system could significantly reduce operational cost. Originality/value Implementation of radically new ICT architecture provides the key element to make a sub-megawatt recuperated turbogenerator viable in terms of power density. The synergetic combination of a recuperator, high temperature turbine and variable speed electric generator provides drastic improvement over simple-cycle turbines, making such a system highly relevant as the power source for future eVTOL applications.

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Salpingidou, C., D. Misirlis, Z. Vlahostergios, M. Flouros, F. Donus, and K. Yakinthos. "Conceptual design study of a geared turbofan and an open rotor aero engine with intercooled recuperated core." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 14 (April 29, 2018): 2713–20. http://dx.doi.org/10.1177/0954410018770883.

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The development of more efficient aero engines is becoming a matter of great importance due to the need for pollutant emissions reduction (e.g. CO2, NOx). Toward this direction, two of the most promising aero engine architectures that have been proposed are the ultrahigh by-pass geared turbofan and the open rotor configurations, both of which are targeting the low thrust-specific fuel consumption and reduced NOx production. In the current study, investigations are performed in order to determine the improvements in thrust-specific fuel consumption for these configurations. More specifically, on the basic geared turbofan and open rotor configurations an intercooler and a recuperator are implemented between the compressors and the exhaust nozzle, respectively. The intercooler is installed in order to reduce the high pressure compressor work demand, while the recuperator is used in order to preheat the compressor discharge air by exploiting the otherwise wasted increased enthalpy content of the exhaust hot gas. The recuperator consists of elliptically profiled tubes and its design is based on the innovative tubular heat exchanger core arrangement that has been invented and developed by MTU Aero engines AG. The intercooled recuperative geared turbofan is evaluated against a nonintercooled recuperative geared turbofan, while the intercooled recuperative open rotor is evaluated against a nonintercooled recuperative open rotor. The results showed that the implementation of intercoolers and recuperators can further improve specific fuel consumption and can also lead to NOx emission reduction.

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Shi, Xusheng, Yongwei Wang, and Xiulan Huai. "Experimental and Numerical Studies of a Recuperator in Micro Turbines." E3S Web of Conferences 162 (2020): 01005. http://dx.doi.org/10.1051/e3sconf/202016201005.

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In this paper, a recuperator model is established to simulate the real working state of the recuperator in the micro turbine. The relative error between simulated and experimental data doesn't exceed 5%, which indicates that the model can better reflect the changing law of the recuperator performance. Therefore, the recuperator model proposed in this paper is reasonable and reliable. In addition, the simulation results indicate that heat transfer efficiency is not sensitive to the change of hot inlet temperature, however, it increases with the decrease of mass flow rate. On the other hand, the decrease of inlet mass flow leads to the relative pressure loss decreased on hot and cold sides.

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Qiuwang, Wang, Liang Hongxia, Xie Gongnan, Zeng Min, Luo Laiqin, and Feng ZhenPing. "Genetic Algorithm Optimization for Primary Surfaces Recuperator of Microturbine." Journal of Engineering for Gas Turbines and Power 129, no. 2 (July 3, 2006): 436–42. http://dx.doi.org/10.1115/1.2436550.

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In recent years, the genetic algorithm (GA) technique has gotten much attention in solving real-world problems. This technique has a strong ability for global searching and optimization based on various objectives for their optimal parameters. The technique may be applied to complicated heat exchangers and is particularly useful for new types. It is important to optimize the heat exchanger, for minimum volume/weight, to save fabrication cost or for improved effectiveness to save energy consumption, under the requirement of allowable pressure drop; simultaneously it is mandatory to optimize geometry parameters of heating plate from technical and economic standpoints. In this paper, GA is used to optimize the cross wavy primary surface (CWPS) and cross corrugated primary surface (CCPS) geometry characteristic of recuperator in a 100kW microturbine, in order to get more compactness and minimum volume and weight. Two kinds of fitness assignment methods are considered. Furthermore, GA parameters are set optimally to yield smoother and faster fitness convergence. The comparison shows the superiority of GA and confirms its potential to solve the objective problem. When the rectangular recuperator core size and corrugated geometries are evaluated, in the CWPS the weight of the recuperator decreases by 12% or more; the coefficient of compactness increases by up to 19%, with an increase of total pressure drop by 0.84% compared to the original design data; and the total pressure drop versus the operating pressure is controlled to be less than 3%. In the CCPS area compactness is increased to 70% of the initial data by decreasing pitch and relatively high height of the passage, the weight decreases by 17–36%, depending on the inclination angle (θ). Comparatively the CCPS shows superior performance for use in compact recuperators in the future. The GA technique chooses from a variety of geometry characters, optimizes them and picks out the one which provides the closest fit to the recuperator for microturbine.

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Schwab, Stephen I. "A Review of: “The Great Recuperator”." International Journal of Intelligence and CounterIntelligence 18, no. 4 (December 2005): 747–50. http://dx.doi.org/10.1080/08850600500177234.

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Qu, Zuoming, Haoning Shi, Xingfei Yu, Qiuwang Wang, and Ting Ma. "Optimization of thermoelectric generator integrated recuperator." Energy Procedia 158 (February 2019): 2058–63. http://dx.doi.org/10.1016/j.egypro.2019.01.474.

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Shul'man, Z. P., V. I. Kordonskii, and S. R. Gorodkin. "A recuperator with a magnetorheological coolant." Journal of Engineering Physics 56, no. 4 (April 1989): 438–42. http://dx.doi.org/10.1007/bf00870598.

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Cai, R. "A new analysis of recuperative gas turbine cycles." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 212, no. 4 (June 1, 1998): 289–96. http://dx.doi.org/10.1243/0957650981536808.

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It is shown that the classical recuperator effectiveness is not an appropriate evaluation criterion for the gas turbine recuperator or a suitable independent thermodynamic parameter of the recuperative gas turbine cycle. Another parameter—the average heat transfer temperature difference in the recuperator—is recommended as the new criterion instead of the recuperator effectiveness. Therefore, the original classical analysis results of the recuperative gas turbine cycle are also inappropriate and it is necessary to give a new analysis. In this paper, the analytical expressions of the simple recuperative cycle efficiency and the optimum pressure ratio based on the new criterion are derived from general simplified assumptions. Some typical calculation results are also presented. With this new criterion, the optimum pressure ratio values for efficiency of a simple recuperative gas turbine cycle do not vary very much with the temperature ratio and are approximately equal to 3, much lower than the figures generally recognized before. A similar analysis for the recuperative gas turbine cycle with intercooler and reheater and an analysis ensuring approximately constant recuperator heat transfer area per unit power output are given also.

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Yaropud, Vitaliy. "RESEARCH OF THE FUNCTIONING AND OPTIMIZATION PROCESS OF THE STRUCTURAL-TECHNOLOGICAL PARAMETERS." ENGINEERING, ENERGY, TRANSPORT AIC, no. 1(108) (August 27, 2020): 142–50. http://dx.doi.org/10.37128/2520-6168-2020-1-16.

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Domestic and foreign scientists in recent years have performed a considerable amount of scientific research on the biological justification of optimal combinations of microclimate parameters required for the normal development of animals. However, the results of the studies do not allow one to specify the optimal parameters for different species of animals, taking into account their age, sex, weight and level of feeding. While it is possible to specify rather wide limits of change of temperature and relative humidity of air at which productivity is maximum, and technical and economic efficiency is approximately the same. Providing microclimate regulations in livestock premises is associated with significant costs of electricity and heat, which is about 17% of the producers' costs. To create a microclimate in livestock premises based on the above technological parameters and the analysis of the design features of the recuperators, two design and technological schemes of the three-pipe recuperator, which differ in the directions of movement of air flows, are proposed. The purpose of the research is to increase the efficiency of the technological process of functioning of the three-pipe recuperator for livestock premises by substantiating its structural and mode parameters. The results of theoretical studies of pneumatic losses in the three-pipe recuperator determined the dependence of pressure and power losses on the length of the air duct of the three-pipe recuperator, the radius of the external duct and the volume flow rate of air. As a result of theoretical studies, a mathematical model of the heat transfer process in a three-pipe heat exchanger was developed, with condensation in it, which allows to determine the temperature distribution of air flows by its length and its thermal capacity. The results of theoretical studies of the process of heat transfer in the design and technological schemes of a three-pipe recirculator with counter-current and direct-current showed that the counter-current variant is more effective. Optimization of the results of theoretical studies allowed us to determine the dependence of the design parameters of the three-pipe heat exchanger on the volumetric flow rate of air, subject to the highest useful thermal power.

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Bowen, T. L., D. P. Guimond, and R. K. Muench. "Experimental Investigation of Gas Turbine Recuperator Fouling." Journal of Engineering for Gas Turbines and Power 109, no. 3 (July 1, 1987): 249–56. http://dx.doi.org/10.1115/1.3240032.

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This paper discusses an experimental investigation of recuperator fouling currently underway at the David Taylor Naval Ship Research and Development Center. The overall approach involves testing different heat exchangers in the exhaust gas stream of a gas turbine. The two heat exchangers initially tested were the plate-fin type and differed in the gas-side heat transfer surface geometry. Primary surface heat exchangers are being considered for future tests also. Test conditions are defined such that the critical part of full-scale recuperators (i.e., the colder end of the gas passages) is simulated in the small test heat exchangers. The composition of the gas stream is measured to determine amounts of gaseous, particulate, and condensible hydrocarbon emissions. Fuel samples taken during each test are analyzed. The test heat exchangers are specially constructed to allow inspection and measurement of the fouling film inside the unit following each test. The temperature distribution inside the test exchanger is measured, as well as air and gas inlet and exit temperatures. Measurements of fouling film thickness are made using an optical microscope and photographs of fouling deposits were taken. The early results obtained from fouling tests conducted with the first heat exchanger are discussed. Tests were also conducted to demonstrate a fouling removal technique.

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NAGASAKI, Takao, and Yutaka ITO. "Study on Recuperator for Ultramicro Gas Turbine." Proceedings of the National Symposium on Power and Energy Systems 2004.9 (2004): 31–32. http://dx.doi.org/10.1299/jsmepes.2004.9.31.

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McDonald, Colin F. "Recuperator considerations for future higher efficiency microturbines." Applied Thermal Engineering 23, no. 12 (August 2003): 1463–87. http://dx.doi.org/10.1016/s1359-4311(03)00083-8.

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Sharapa, A. N., and A. V. Shemyakin. "Efficient recuperator of intense electron beam energy." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 289, no. 1-2 (April 1990): 14–16. http://dx.doi.org/10.1016/0168-9002(90)90247-4.

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34

Şahin, Ahmet Z. "Thermodynamic design optimization of a heat recuperator." International Communications in Heat and Mass Transfer 24, no. 7 (November 1997): 1029–38. http://dx.doi.org/10.1016/s0735-1933(97)00088-2.

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Гавриш, Богдан Анатолійович, Михайло Володимирович Коржик, and Михайло Васильович Лукінюк. "Rotary recuperator statics: natural research and identification." Proceedings of the NTUU “Igor Sikorsky KPI”. Series: Chemical engineering, ecology and resource saving, no. 3 (November 27, 2020): 35–42. http://dx.doi.org/10.20535/2617-9741.3.2020.217903.

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Guo, Jiangfeng. "Design analysis of supercritical carbon dioxide recuperator." Applied Energy 164 (February 2016): 21–27. http://dx.doi.org/10.1016/j.apenergy.2015.11.049.

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Alekseenko, V. v., O. B. Sezonenko, and O. O. Vasechko. "RECUPERATION OF HEAT OF INCINERATORS FOR WASTE OF MEDICAL INSTITUTIONS." Energy Technologies & Resource Saving, no. 2 (June 25, 2018): 31–38. http://dx.doi.org/10.33070/etars.2.2018.04.

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Methods of reduction of temperature of exhausted gases for incinerators and features of their practical application were considered. Conditions of effective usage of recuperation of exhaust gases heat during thermal disposal of waste were considered. Methods of recuperation of exhaust gases heat of medical institutions’ waste were adduced and character ized. Evaluation of potential value of heat in exhaust gases of combustion of medical institutions’ waste was produced. Nonstationarity of the development of heat, typical of incinerators of medical institutions, which influence on coordination with load curve of potential heat consumer, was considered. The method of heat recuperation by heating of air, which is fed directly into incinerator, was offered. The constructive realization of this method and parameters of recuperator under working loads of incinerator were presented. Bibl. 11, Fig. 4, Tab. 2.

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Gogoi, T. K. "A combined cycle plant with air and fuel recuperator for captive power application, Part 1: Performance analysis and comparison with non-recuperated and gas turbine cycle with only air recuperator." Energy Conversion and Management 79 (March 2014): 771–77. http://dx.doi.org/10.1016/j.enconman.2013.10.028.

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39

Tacconi, J., W. P. J. Visser, and D. Verstraete. "Multi-objective optimisation of semi-closed cycle engines for high-altitude UAV propulsion." Aeronautical Journal 123, no. 1270 (August 7, 2019): 1938–58. http://dx.doi.org/10.1017/aer.2019.62.

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ABSTRACTThe maximum attainable performance of small gas turbines represents a strong limitation to the operating altitude and endurance of high-altitude unmanned aerial vehicles (UAVs). Significant improvement of the cycle thermal efficiency can be achieved through the introduction of heat exchangers, with the consequent increase of the overall engine weight. Since semi-closed cycle engines can achieve a superior degree of compactness compared to their open cycle counterparts, their use can offset the additional weight of the heat exchangers. This paper applies semi-closed cycles to a high-altitude UAV propulsion system, with the objective of assessing the benefits introduced on the engine performance and weight. A detailed model has been created to account for component performance and size variation as function of thermodynamic parameters. The sizing has been coupled with a multi-objective optimisation algorithm for minimum specific fuel consumption and weight. Results of two different semi-closed cycle configurations are compared with equivalent state-of-the-art open cycles, represented by a recuperated and an intercooled-recuperated engine. The results show that, for a fixed design power output, engine weight is approximately halved compared to state-of-the-art open cycles, with slightly improved specific fuel consumption performance. Optimum semi-closed cycles furthermore operate at higher overall pressure ratios than open cycles and make use of recuperators with higher effectiveness as the mass penalty of the recuperator is smaller due to the lower engine mass flow rates.

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Li, Da, Qiang Sun, Ke Sun, Guodong Zhang, Shuzhan Bai, and Guoxiang Li. "Diesel engine waste heat recovery system comprehensive optimization based on system and heat exchanger simulation." Open Physics 19, no. 1 (January 1, 2021): 331–40. http://dx.doi.org/10.1515/phys-2021-0039.

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Abstract To further improve the thermal efficiency of diesel engines, a waste heat recovery system model utilizing organic Rankine cycle (ORC) is constructed and verified through system bench test and heat exchanger bench test. To recover waste heat from diesel engine exhaust, ethanol, cyclopentane, cyclohexane, R1233zd (E), and R245fa were selected for comparison. The quality of heat source, the quality of evaporator, the system output, and the system complicity were taken as variables for comparison. Analysis shows that for ORC systems without recuperator, ethanol system has the best system output of the five in a wide operation temper range, with the highest exergy efficiency of 24.1%, yet the exergy efficiency increase after the application of recuperator, 9.0%, is limited. For low temperature exhaust, cyclopentane system has the best performance with or without recuperator, and the cyclopentane system with recuperator has the best performance in terms of exergy efficiency, 27.6%, though complex heat exchangers are also required for high power output. The system output of the R1233zd system is better than the R245fa system, yet the advantage of low evaporate temperature can be better utilized for low quality waste heat recovery.

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Biryukov, A. B., A. N. Lebedev, P. A. Gnitiev, and Ya S. Vlasov. "Optimization of the built-in recuperator surface of recuperative burner according to the criterion of energy coefficient maximum." Vestnik IGEU, no. 1 (2020): 5–11. http://dx.doi.org/10.17588/2072-2672.2020.1.005-011.

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The recuperative burners is a modern direction of reducing fuel consumption during the heat treatment of metals in furnaces. Their use can significantly reduce fuel consumption. Despite the evident advantages, the spread of such equipment is constrained due to its high cost. The research is conducted for determining ribs rational profile and optimizing mass and size characteristics of a built-in recuperator. There are results that make it possible to reduce either the recuperator mass or its aerodynamic resistance. However, such changes contradict each other, so a compromise solution must be found. Currently, there are no generally accepted methods of thermotechnical calculations for recuperative burners. This work aims to develop a methodology to optimize the built-in recuperator surface according to the criterion of maximizing the energy coefficient. To conduct the study, the elements of recuperative heat exchange theory for counter-flow media were used. The proven methodology for determining the temperature of heated air and cooled combustion products after recuperator was applied. Also, the known concept of energy coefficient was used for the research. A technique has been developed to optimize the surface of the incorporated heat exchanger according to the criterion of maximizing the energy coefficient. The technique includes composing an expression for determining the energy coefficient, taking its derivative and equating it to zero with further solving the obtained equation with respect to heat exchange surface. The developed method was used in the recuperative burner with the thermal power of 500 kW. For the range of heat transfer coefficient 75–200 W/(m2·K) associated to the smoothtube part, a fifth-degree polynomial has been determined which describes the dependence of the smoothtube part optimal value of a built-in recuperator surface on the heat transfer coefficient. The developed technique is important for recuperative burners design, for increasing their efficiency and reducing their production cost. The methodology error associated with the assumption that the heat transfer coefficient is constant when the length of the built-in recuperator changes does not exceed 5 %.

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42

Polivaev, Oleg I., Alexey N. Larionov, and Dmitry B. Bolotov. "Reduction of vehicle exhaust gas toxicity due to brake energy recovery." Traktory i sel hozmashiny 89, no. 1 (July 8, 2022): 15–21. http://dx.doi.org/10.17816/0321-4443-100839.

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BACKGROUND: In recent years, fleet of vehicles in the Russian Federation is on a significant increase, that leads to considerably amplified emissions of toxic gases into the atmosphere. The share of toxic gas emissions from motor vehicles ranges from 65 to 70%. In order to reduce the toxic gas emissions into the atmosphere, electric vehicles have been introduced, but they have a number of disadvantages. These are a limited mileage before recharging and expensive batteries. Also, works on the use of hydrogen as a fuel for cars are conducted at an accelerated pace. However, the issue of a hydrogen fuel storage has not yet been worked out. At the same time, the used fleet of vehicles continues to poison the atmosphere. AIMS: Studying the braking energy recuperator for decreasing carbonic oxide CO in exhaust gases of the UAZ car. METHODS: The construction of a combined unit with a gas-hydraulic braking recuperator was developed, which is installed on a UAZ vehicle (RF Pat. No. 2193977). Comparative studies were carried out in accordance with GOST 33670-2015 and GOST 52033-2003. RESULTS: Results of comparative studies of the car showed that a minimum of CO emissions is observed in high gear, at a speed of 1825 m/s, and CO emissions significantly increase in lower gears. The recuperator eliminates this drawback due to the additional power transmission to the driving wheels. CONCLUSION. When a car starts in the urban cycle, there is a minimum of CO emissions with a recuperator, at the same time the car acceleration increases, that reduces the acceleration time and the distance by 3035%. A car with a recuperator on average consumed gasoline up to 15 l per 100 km, and this parameter of the production car was up to 17,5 l per 100 km of track. Due to the recuperator, CO emissions are reduced by 16%.

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Rauch, Martina, Saša Mudrinić, and Antun Galović. "Detailed Analysis of Exergy Destruction of All Basic Types of Heat Exchangers." Processes 10, no. 2 (January 27, 2022): 249. http://dx.doi.org/10.3390/pr10020249.

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Dimensionless expressions of exergy destruction, normalized to ambient temperature and heat capacity of the weaker stream, for all basic types of recuperators are derived. The analytical expressions for maximum exergy destruction were calculated using the GNU Octave software for all recuperators, namely parallel-flow and counter-flow recuperators, and all forms of cross-flow heat exchangers, namely without mixing of streams, only mixing the streamlines of the weaker stream, only mixing the streamlines of the stronger stream and mixing the weaker and stronger streams. For parallel-flow and counter-flow recuperators, as well as for their special cases, expressions for local and total exergy destruction are given. It is shown that the maximum exergy destruction, as a local extreme, is the same for all recuperators for mutually equal values of the quantities π3 (ratio of the heat capacity of the weaker stream to the heat capacity of the stronger stream) and πT (ratio of the inlet temperature of the stronger stream to the inlet temperature of the weaker stream). The ratio of exergy destruction to effectiveness of each basic type of recuperator is further analyzed. The obtained results are presented and interpreted in appropriate dimensionless diagrams.

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Maziasz, Philip J., John P. Shingledecker, Bruce A. Pint, Neal D. Evans, Yukinori Yamamoto, Karren More, and Edgar Lara-Curzio. "Overview of Creep Strength and Oxidation of Heat-Resistant Alloy Sheets and Foils for Compact Heat Exchangers." Journal of Turbomachinery 128, no. 4 (February 1, 2005): 814–19. http://dx.doi.org/10.1115/1.2187525.

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The Oak Ridge National Laboratory (ORNL) has been involved in research and development related to improved performance of recuperators for industrial gas turbines since about 1996, and in improving recuperators for advanced microturbines since 2000. Recuperators are compact, high efficiency heat-exchangers that improve the efficiency of smaller gas turbines and microturbines. Recuperators were traditionally made from 347 stainless steel and operated below or close to 650°C, but today are being designed for reliable operation above 700°C. The Department of Energy (DOE) sponsored programs at ORNL have helped defined the failure mechanisms in stainless steel foils, including creep due to fine grain size, accelerated oxidation due to moisture in the hot exhaust gas, and loss of ductility due to aging. ORNL has also been involved in selecting and characterizing commercial heat-resistant stainless alloys, like HR120 or the new AL20-25+Nb, that should offer dramatically improved recuperator capability and performance at a reasonable cost. This paper summarizes research on sheets and foils of such alloys over the last few years, and suggests the next likely stages for manufacturing recuperators with upgraded performance for the next generation of larger 200-250kW advanced microturbines.

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Derevianchuk, Anatolii, Andrii Vakal, Volodymyr Diachenko, and Roland Gevorgian. "THE METHOD OF PARAMETERS VERIFICATION OF CANNON HYDROPNEUMATIC RECUPERATOR MECHANISM." Collection of scientific works of Odesa Military Academy, no. 15 (September 30, 2021): 121–27. http://dx.doi.org/10.37129/2313-7509.2021.15.121-127.

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Technical maintenance of armament at this stage is one of the main artillery requirements. At the same time stable and correct work of hydraulic recoil mechanism is a necessary part of exploitation of this weapon type. According to the operational documentation requirements, cannon hydraulic recoil mechanism is verified during the preparation to the shooting and technical maintenance. It is obligatory to determine initial air pressure and liquid volumes inside the recuperator mechanism of recoil absorber and its approximation to all the norms outlined in the operational documentation. We consider the problems, related to preservation of necessary air pressure and liquid volumes while the shooting, to be very important in comparison with other actions. Their values deviations may cause changes of working parameters of recoil absorber and recuperator mechanism in particular and, consequently, it changes such significant operational parameters of hydraulic recoil mechanism as recoil velocity and length, velocity of recuperator mechanism, etc. Such conditions may lead to emergency situation, and a cannon may lose stability or constructive integrity. That is why the aim of the article is to develop efficient method to verify initial parameters of hydraulic recoil mechanism before the shooting as it will help to bring them to the norms outlined in the operational documentation in the shortest term. The resolution of this problem will contribute to further improvement of modes of exploitation of armament and military equipment. To enhance the level of maintenance of cannons, its recuperator mechanisms using multifunctional pneumatic device in relation to standard instruments that are necessary to verify hydraulic recoil mechanisms of the abovementioned artillery systems means to create the device of new construction with the use of modern light and strong materials as well as progressive technologies. In future it will lead to checking procedures simplification, reducing the execution time, increasing the efficiency of personnel operation and safety. Further research will deal with development of technique of determination of liquid in the recuperator without the use of its test graph. Keywords: hydraulic recoil mechanism, cannons, modes of exploitation.

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46

Imomov, Sh Zh. "Engineering design calculation of a biogas unit recuperator." Applied Solar Energy 43, no. 3 (September 2007): 196–97. http://dx.doi.org/10.3103/s0003701x07030188.

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Pavlenko, V., and О. Volianyk. "INVESTIGATION OF RECUPERATOR EFFICIENCY USING IN RESIDENTIAL PREMISES." Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 136, no. 4 (November 18, 2019): 77–85. http://dx.doi.org/10.30857/1813-6796.2019.4.8.

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Investigation of ventilation and conditioning systems for residential premises in order to ensure a healthy atmosphere and maintain a comfortable temperature in such premises. Methodology. Analytical investigation of the ventilation systems, recuperation technologies which can be applied in residential premises.

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Ludwig, Wojciech, and Daniel Zając. "Modification of a recuperator construction with CFD methods." Chemical and Process Engineering 38, no. 4 (December 1, 2017): 567–76. http://dx.doi.org/10.1515/cpe-2017-0045.

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Abstract The purpose of the work was initial modification of the construction of a commercially produced heat exchanger – recuperator with CFD (computational fluid dynamics) methods, based on designs and process parameters which were provided. Uniformity of gas distribution in the space between the tubes of the apparatus as well as the pressure drop in it were taken as modification criteria. Uniformity of the gas velocity field between the tubes of the heat exchanger should cause equalization of the local individual heat transfer coefficient values and temperature value. Changes of the apparatus construction which do not worsen work conditions of the equipment, but cause savings of constructional materials (elimination or shortening some parts of the apparatus) were taken into consideration.

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Laura Alina, STIKA, POPESCU Jeni Alina, TOMESCU Sorin Gabriel, and VILAG Valeriu-Alexandru. "Performance estimation on micro gas turbine plant recuperator." INCAS BULLETIN 8, no. 4 (December 2, 2016): 115–23. http://dx.doi.org/10.13111/2066-8201.2016.8.4.10.

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Гавриш, Богдан Анатолійович, Михайло Володимирович Коржик, and Михайло Васильович Лукінюк. "Rotary recuperator statics: search for optimal operating modes." Proceedings of the NTUU “Igor Sikorsky KPI”. Series: Chemical engineering, ecology and resource saving, no. 4 (December 24, 2020): 29–34. http://dx.doi.org/10.20535/2617-9741.4.2020.219781.

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Journal articles on the topic 'Recuperator'

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