Efficient Exchanger Research Articles

Effects of 2-D and 3-D helical inserts on the turbulent flow in pipes

A constant search for more efficient heat exchangers motivates the use of innovative turbulators. Original flow-field measurements were performed with S-PIV to gain a better understanding of the role of 3-D wall obstacles in pipe flows. Such effects are compared with those of 2-D helically corrugated tubes, which are already provided in the literature. This work further investigates the impact of both continuous (2-D corrugation) and discontinuous (3-D corrugation) obstructions on the surrounding velocity field. The analysis of the flow structures is made by comparing two types of helicoidal turbulators. The continuous geometry has a pitch-to-diameter-ratio of p/D = 11 and an inclination angle of 80°. An obstacle height-to-diameter-ratio of e/D = 3.6% is used, which is constant throughout the helix-wise direction. The discontinuous geometry is equivalent to the continuous one except that it has a varying obstacle height throughout the helix. The reattachment and redevelopment of the flow are determined by time-averaged velocity analysis, at Re = 20,000. Notably, the aim of this study is to examine the effects of the discontinuity in the tube corrugation on the flow separation/reattachment, turbulence statistics, vorticity (ω) and strain-rate (Sxy) of the flow particles, and compare them with a previously studied continuous turbulator. As a result, the discontinuous rib has a lower impact on the pressure losses, on the azimuthal swirl, and on the turbulent kinetic energy generation. In the field close to the wall, the changing height of the discontinuous rib generates a turbulent kinetic energy and an azimuthal velocity, respectively, 50% and 35% lower than the continuous configuration. The irregularity of the discontinuous obstacles provides a reduced skin friction coefficient (Cf) which is 0.57 times the one given by the continuous 2-D helical turbulator. On the other hand, the observed less intense wall-bounded turbulence levels associated with the 3-D helical turbulator suggest a lower local heat transfer enhancement.

Three-dimensional fin-tube expansion process to achieve high heat transfer efficiency in heat exchangers

A novel manufacturing process for expanding the tubes of fin-tube type heat exchangers using a three-dimensional (3D) spiral expanding ball fabricated via metal additive manufacturing was proposed for the manufacture of highly efficient heat exchangers. To improve the heat transfer efficiency of fin-tube type heat exchangers, fine grooves are generally formed inside a tube to increase the heat transfer area. However, the height of a groove is commonly reduced when a tube is expanded for tightening with fins. To address this issue, a 3D expanding ball with spiral grooves was first developed and used in the expansion process. In conventional tube expansion, the height reduction of grooves is approximately 10.3 %. However, we demonstrated that it was dramatically improved, reaching approximately 1.7 %, when the proposed process with a 3D expanding ball was applied. We believe that this approach can be used in practical industries to manufacture highly efficient fin-tube heat exchangers.

Synthesis and characterization of novel N-methylimidazolium-functionalized KCC-1: A highly efficient anion exchanger of hexavalent chromium

A key challenge in adsorption process of toxic organic and inorganic species is the design and development of adsorbent materials bearing an abundance of accessible adsorption sites with high affinity to achieve both fast adsorption kinetics and elevated adsorption capacity for toxic contaminants. Herein, a novel anion-exchange adsorbent based on fibrous silica nanospheres KCC-1 was synthesized by a facile hydrothermal-assisted post-grafting modification of KCC-1 with 1-methyl-3- (triethoxysilylpropyl)imidazolium chloride for the first time. Silica fibers with micro-mesoporous structure display the proper combination of features to serve as a potential scaffold for decorating adsorption sites to create desired ion-exchange adsorbent. The obtained N-methylimidazolium-functionalized KCC-1 (MI-Cl-KCC-1) with fibrous nanosphere morphology showed a high surface area (∼241 m2 g−1) and high pore volume (0.81 m2 g−1). The adsorption behaviors of toxic hexavalent chromium from aqueous media by the MI-Cl-KCC-1 were systematically studied using the batch method. The adsorption rate was relatively fast, and MI-Cl-KCC-1 possesses a high capacity for the adsorption of Cr(VI). The maximum Cr(VI) adsorption was obtained at pH 3.0–4.0. Different non-linear isotherm equations were tested for choosing an appropriate adorption isotherm behavior, and the adsorption data for MI-Cl-KCC-1 were consistent with the Langmuir model with a maximum adsorption capacity of 428 ± 8 mg g−1.

ЗАСТОСУВАННЯ ГАЗОДИНАМІЧНОГО ОХОЛОДЖЕННЯ В СИСТЕМАХ РЕЦИРКУЛЯЦІЇ ВІДХІДНИХ ГАЗІВ СУДНОВИХ ДИЗЕЛІВ

There are many ways and methods to reduce exhaust gases emissions on modern ships. One of the most effective ways to reduce NOx and SOx emissions is to use of exhaust gas recirculation (EGR technology). The EGR system disadvantage is an increase in back pressure through additional pressure losses in the scrubber and heat ex-changer, which entails an engine fuel efficiency deterioration. Creating a reliable and efficient heat exchanger for cooling recirculation gases is a complex task due to deposits and pollution emitted by these gases. In the pre-sent work, the jet apparatus effectiveness named aerothermopressor is analyzed in the scheme with exhaust gases recirculation of the ship low-speed two-stroke engine. Aerothermopressor is a two-phase jet for contact disperse cooling, in which by increasing the heat from the gas stream the gas pressure and cooling are increased. The calculation of the characteristics of the engine was carried out, both in nominal, and in operating modes and in all possible range of partial loads. The installation of the aerothermopressor before the scrubber is pro-posed, which allows reducing engine thermal load. Increasing the pressure in the aerothermopressor by 0.2-0.4 ∙ 105 Pa (6-12 %) allows reducing the back pressure in the gas exhaust system and thus reducing the load on the exhaust gas recirculation fan and when the engine load is higher than 75% in the cold zone, the fan is not need-ed, which additionally allows to reduce the specific fuel consumption. The parameters of the exhaust gases that are going to be recirculated and the processes of their gas-dynamic cooling in the aerothermopressor are based on the developed technique and program using the thermodynamic and gas dynamics equations. The proposed scheme-design solution allows at a high environmental friendliness of the existing exhaust gas recirculation sys-tem to provide a certain reduction in specific fuel consumption. It was determined that the engine specific fuel consumption has been decreasing when the aerothermopressor is used to Dge = 2.5-3.0 g/(kW·h) (1.5-1.7%).

Development and Analysis of Heat Exchanger for Efficient Heat Transfer for L-Shape Wind Tunnel

As automation and mechanical industry growing towards next era, it becoming crucial to design each element of plant with more productive material. Out of many parameters, heat transfer is very important area of study to lower the rate of failure of numerous machines. For heat transfer control there is a need of design of efficient heat exchanger. A heat exchanger can be designed for minimization of heat energy from the wind tunnel. Impact on HE performance is important due to the thermal resistance of wind tunnel. Thermal resistance is the heat property of the tunnel material and dimensions of tunnel. Looking at application level performance, the thermal resistance is crucial element in case of aerodynamic study. The similar study is done for Apolo11 spacecraft which was important in case of landing back to earth as traveling to earth with high speed generated heat which can damage spacecraft body. Such study further leads to various domains like material research, human impact study etc. The most recently, asteroid is passed nearby of earth orbit, where aerodynamic study of NASA evaluated the pre-collision effects where thermal properties are analyzed considering the atmospheric nearby orbit as a tunnel of wind/pressure. Hence, the scenarios must be considered for heat transfer / heat exchanger design specific to the each application domain. This paper discusses about the asteroid bypass which generates heat as a major heat transfer to earth and the automobile specific modeling of heat exchanger for wind tunnel. The focus is kept on heat exchanger design which can be suggested for automobile testing procedure.

New tools to support the designing of efficient and reliable ground source heat exchangers: the Cheap-GSHPs databases and maps

Abstract. The final aim of the EU funded Cheap-GSHPs project is to reduce the total installation cost of closed-loop shallow geothermal systems. As part of the project a Decision Support System (DSS) has been developed and released on the web, in order to support the design of new closed-loop geo-exchange systems. The Cheap-GSHP project addresses all the aspects involved in planning and dimensioning a new borefield and therefore, the DSS is composed of several databases and tools that collect and elaborate the preliminary data and information that are necessary during the sizing phase, such as the geological and drilling aspects as well as the heating and cooling building demand. This paper briefly introduces the content of the databases and the mapping methodology developed for the Cheap-GSHPs DSS. All these researches are further deepen in the EU project GEO4CIVHIC, with a special attention to the application of shallow geothermal systems for building conditioning to historical buildings.

Tuning Poly(ionic liquid) as a Facile Anion (Hexacyanoferrate(III) ion) Exchanger after Being Adsorbed on Graphitic Nanomaterial and Its Versatile Electrocatalytic Oxidation of Ascorbic Acid

Owing to their conductivity and high polarity, ionic liquids and poly(ionic liquids) (PILs) have been often used as an electrolyte for various applications in electrochemistry. Due to the unfavorable ion-exchange property and structural feature (hydrophobic environment and inaccessible ionic site), unmodified ILs and PILs are rarely worked out as an ion-exchanging system. Herein, we show elegant tuning of aromatic unit bearing PILs as an efficient anionic ion exchanger after being combined with graphite nanomaterials like graphite nanopowder (GNP) and carbon nanotube for novel electrocatalytic applications. A chemically modified electrode prepared out of GNP and random copolymer of 1-vinyl-3-pentylimidazolium chloride and styrene (coPIL₁Cl) composite ethanol suspension on a glassy carbon electrode (GCE) showed facile immobilization of hexacyanoferrate(III) ion (as a model anionic system), electrode designated as GCE/GNP-coPIL₁@Fe(CN)₆³–, in pH 7 phosphate buffer solution. The modified electrode yielded well-defined surface-confined redox peak at equilibrium potential, E₁/₂ = 100 ± 5 mV vs Ag/AgCl with a surface excess and relative standard deviation values of 3.0 nmol cm–² and 1.8%, respectively. From the experiments with different functional counterions (Cl–, SO₃CF₃–, BF₄–, and PF₆–), alkyl chains (butyl and pentyl groups), and N-terminal-substituted aromatic unit and from physicochemical characterizations of PIL-modified electrodes, how the π–π interaction, hydrophobic and hydrophilic sites, and steric factor of PIL influence the ion-exchanging behavior of the GNP-coPIL₁Cl composite with ferricyanide ion was demonstrated. Electrocatalytic oxidation of ascorbic acid (AA) was investigated as a model system for the ferricyanide-modified electrode performance using cyclic voltammetric and amperometric i–t techniques. Highly selective and superior electrocatalytic and sensing of AA over its unmodified electrodes were noted.

TiB2–SiC-based ceramics as alternative efficient micro heat exchangers

Ceramics as functional materials durable at corrosive media or high temperatures are suitable candidates for manufacturing heat exchangers. In the present work, a series of numerical simulations was carried out to investigate the heat transfer in micro heat exchanger made by TiB 2 –SiC and TiB 2 –SiC doped with 2 wt% carbon fiber. Experimental thermal diffusivity data of materials were obtained by laser flash method and used for numerical simulations. This article demonstrates the feasibility of better heat transfer and performance for ceramic heat exchangers. Conduction heat transfer equation in solid walls of heat exchanger along with fluid flow governing equation was used for solid and fluid domains. The governing equations were discretized by the finite element method and solved by COMSOL Multiphysics software. The obtained results showed that the thermal conductivity of both TiB 2 -based composites are approximately the same and small amount of carbon fiber had no considerable effect on the thermal properties of the composites. For the ceramic heat exchanger, a higher heat transfer with 15.5% enhancement occurs using TiB 2 composites compared to utilization of Al 2 O 3 .

Method of thermal calculation of a heat exchanger with a dense layer of granulated material

The aim of the work is to develop a methodology for calculating the heat exchanger for the utilization of low-potential heat fluxes from industrial enterprises and its approbation. Methods of solution included the analysis of existing heat recovery devices, the identification of existing problems of creating efficient heat exchangers and the creation of an algorithm for calculating heat exchangers with a dense layer of granulated material. The possibility of using low-potential thermal secondary energy resources in the form of exhaust gases from industrial enterprises of low energy capacity, in particular, food, is considered. Heat exchangers with a fixed dense layer of granular materials are analyzed, providing direct heat exchange of gas (air) with particles. There is a shortage of developed efficient heat exchangers for low-potential heat fluxes and information on rational thermal modes of their operation. The effectiveness of the use of granular materials in heat and power engineering is noted from the standpoint of intensifying the processes of heat and mass transfer is shown. The method of thermal calculation of the contact heat exchanger to determine its geometric characteristics and the main process parameters is described. The proposed method takes into account the change in the coefficient of intercomponent heat transfer over time. The results of calculations of the main characteristics of an industrial heat exchanger with fixed filler are presented. In the regenerator with fixed filler there is no need to organize the movement of a layer of granular material, which greatly simplifies the operation and design of the heat exchanger. The results of the calculation of a fixed bed heat exchanger designed for space heating, located directly next to the ventilation channels of the enterprise, are presented. In the proposed heat exchanger in the heating period, the heat is transferred by direct contact of the gas flow with the material particles, and in the cooling period the heat is transferred from the outer surface of the heat exchanger to the environment. To obtain a smoothed heating characteristic of the room, it is advisable to duplicate the working channels of the heat utilizer filled with granular material and turn them on alternately. The calculated heat exchangers are characterized by a relatively high efficiency and the ability to work without direct contact of the particles with the air of the heated room. Designed for low-potential heat flux of regenerator designs are offered for use in food production plants

Process optimization of methane reforming to syngas using Gliding Arc Plasmatron

The main objective of this paper is analysis of the advantages of using non‐thermal gliding arc plasma for natural gas reforming to Syngas. The key feature of gliding arc reforming process is that non‐equilibrium plasma is used only as a catalyst thus ensuring minimum energy consumption (3–5% of fuel heating value). The dependence of Specific Energy Requirement (SER), Electric Power Consumption and produced syngas composition on incoming air/methane flow rate, O/C ratio and preheating temperature is discussed. The optimal parameters of the process (SER −0.25 kW‐h m−3 of syngas at O/C ratio – 1.3 and electric power consumption <5%) could be achieved by preheating incoming air/methane mixture with highly efficient heat exchanger (simulated in experiments by external electrical heater). With the aim of possible industrial applications, the results obtained are at high flowrate (40–80 SLPM), O/C ratio 1.1–1.5, preheating temperature − 800 K and high Syngas concentration (H2‐ 25–27 vol.%; CO 15–17 vol%).

Simple, green approach for the synthesis of solid support‐embedded PdNPs for ligand exchange

Green approaches have the potential to significantly reduce the costs and environmental impact of chemical syntheses. Here, the authors used green tea (GT) leaf extract to synthesise and anchor palladium nanoparticles (PdNPs) to silica. The synthesised PdNPs in GT extract were characterised by ultraviolet-visible spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, and transmission electron microscopy. PdNPs primarily formed as capped NPs dispersed in GT extract before reduction completed after 24 h. This capped phytochemical solution was employed as a green precursor solution to synthesise PdNP-embedded solid supports. The morphology of PdNPs anchored to silica differed to that of PdNPs in solution. Silica-embedded PdNPs was employed as a new ligand exchanger to isolate trace polycyclic aromatic sulphur heterocycles from a hydrocarbon matrix. The isolation efficiency of the new, greener ligand exchanger was the same as an efficient chemical ligand exchanger and may, therefore, hold promise for future applications.

Improved thermal performance of annular fin-shell tube storage system using magnetic fluid

The main contribution of this paper is achieving a significant thermal performance improvement of annular fins-shell-tube heat exchanger energy storage system using magnetic fluid. The fin efficiency is increased by 20% with annular fin-magnetic fluid geometry as compared to without magnetic fluid. This improvement in thermal characteristics of annular fin system can be attributed to the formation of nano-channels in the field directions and effective increase in overall heat transfer coefficient due to the replacement of solid-gas interface with the liquid-gas interface. This replacement leads to improved convective heat transfer rate and overall thermal characteristics, which is the new knowledge contribution for various energy storage systems. In the present work, a simple and novel method for improving the thermal performance of natural convection energy storage system is reported. This novel method can improve the overall performance of the systems with natural convection extended surfaces and makes it suitable for numerous heat transfer applications. A magnetic fluid thin layer association with annular fin geometry has been proposed to improve the shell-tube heat exchangers performance, and an in-house experimental setup is used to study its dimensional and non-dimensional heat transfer characteristics. Kerosene and water-based MF were prepared by chemical co-precipitation method and employed on the top surface of the fin to maximise the heat transfer rate and to increase the effectiveness (ε) of the fin system. This thin layer of MF was maintained on the top surface of the fins using the magnetic ring of small NdFeB magnet of 1 mm thickness and 2.5 mm diameter. It is observed that a significant increase in relative heat transfer rate (∼35%) taking place using a thin MF layer over the top surface of the fin which leads to enhancement in fin performance. Also, the temperature distribution along the length of the fin shows a sharp decrease in temperature near the top surface which corroborates our observations that the magnetic ring over the surface works as a chill block which provides a directional cooling through magnetic nano-channels. These new findings can be valuable in the design of an efficient annular fin-shell tube latent heat exchanger storage system.

Heat integration and heat recovery steam cycle optimization for a low-carbon lignite/biomass-to-jet fuel demonstration project

This paper reports the heat integration study for a demonstration plant to co-process lignite and woody biomass into jet fuel with CO2 capture and storage. Since all the main process reactions are exothermic and convert approximately 65% of the feedstock chemical energy into heat, designing an efficient heat recovery steam cycle and heat exchanger network is essential for the overall thermo-economic performance. Different integration options for the plant’s heat recovery steam cycle are analyzed and compared, considering costs and the key technical limitations. The design of the heat recovery steam cycle and heat exchanger network is optimized with an energy targeting methodology, a sequential synthesis method and a recently proposed simultaneous methodology. Given the high specific costs of the units caused by the novelty and small size and of the demonstration plant, the techno-economic optimization returns solutions with considerably lower efficiency (up to −5% percentage points) and power output (up to −18%) compared to the energy targeting methodology. The difference in optimal HRSC designs and performance are minor (less than −2% power output) for full-scale plants based on mature technologies.

Parametric optimization of H-type finned tube with longitudinal vortex generators by response surface model and genetic algorithm

Low-low temperature electrostatic precipitator technology is one of the important ways for energy saving and emission reduction of coal-fired power plants. In order to further improve the dust removal efficiency and enhance waste heat recovery performance, a novel H-type finned elliptical tube heat exchanger with longitudinal vortex generators is proposed. To achieve the maximum heat transfer enhancement with the minimum friction factor augmentation, the response surface model and multi-objective genetic algorithm are adopted to optimize the design parameters. Firstly, combined with the finite volume method and the central composite design method, the second-order response surface model between the design parameters (the length, height, angle, and position of longitudinal vortex generators) and the objective functions (Nusselt number and friction factor) is established. Then, based on the response surface model, the Pareto optimal solution set is obtained by the multi-objective genetic algorithm. Finally, by comprehensively comparing Nusselt number, friction factor and performance evaluation criteria of Pareto optimal solutions, the optimal combination is determined. Compared with the H-type finned tube heat exchanger, the performance evaluation criteria of the optimized novel heat exchanger is improved by 48–55%, which contributes to improve the overall performance of low-low temperature electrostatic precipitator system. The findings of this paper may provide practical guidelines for researchers and designers to develop efficient heat exchangers.

Identification of log units in clay rock formations based on local and spatial statistics of well-log properties: application to the Opalinus claystone in the Benken borehole

Abstract Due to their particularly good mechanical and self-healing properties combined with exceptionally efficient cation adsorbents and exchanger capacities, clay minerals and clay rock formations are considered as suitable geological barriers for radioactive waste disposal. The Middle Jurassic Opalinus Clay Formation has been identified as a potential host rock. Logging data were measured at the Benken borehole drilled through this formation in northern Switzerland. This paper presents a statistical methodology to improve the description of the physical properties of the clay rock based on the well-log data. The methodology involves the classification of a set of local statistics, calculated from a reduced number of principal components computed from well-log properties. The use of a kernel-based method to calculate local statistics allows an analysis of spatial variability to be carried out at different scales, and with different scale effects. The first-order layering was found to be robust and independent of kernel size (i.e. observation scale), while preserving small-scale heterogeneities that are useful for further interpretation. The log units can be more clearly interpreted in terms of stationary or transitional log units, depending on the behaviour of local statistics. Finally, the derived spatial variability of the log-units properties are compared with earlier lithological descriptions and stratigraphic data.

Изучение эффективности сильноосновных ионообменных смол при извлечении урана из продуктивных растворов подземного скважинного выщелачивания

The process of uranium sorption is one of the important stages in the production of uranium. This stage affects uranium extraction effectiveness from productive solutions. The sorption and desorption characteristic of anion exchange resins in dynamic condition were investigated in order to study the effectiveness of resins, which were used for extraction of uranium from sulfuric acid productive solution. The sorption and desorption of uranium from the productive solution on anion exchange resins AB-17 and DOWEX 1X8 200 was carried out in laboratory conditions. The sorption characteristics were investigated. The determined sorption capacities of the resins were 1.47 and 14.4 mg/mL, respectively. The most efficient anion exchanger is DOWEX 1X8 200 that has a high sorption capacity as well as good desorption characteristics, which make it possible to obtain solutions having 23 times higher uranium concentrations than in productive solutions.

Influence of geometric parameters on the gas-side heat transfer and pressure drop characteristics of three-dimensional finned tube

Three-dimensional fin tubes have been used in efficient compact heat exchangers for many years. To further improve the heat transfer efficiency, the Taguchi method is used to study the influence of the structural parameters of three-dimensional finned tubes on the heat transfer and pressure drop characteristics in the air cross-flow. The effects of the fin height, fin width, axial fin pitch and circular fin pitch have been studied, and the contribution ratios of each structural parameter on the thermo-hydraulic performance are given. The results show that the influence of the fin height on the heat transfer and flow resistance is the largest, which should be considered as the preferential factor in the design of three-dimensional finned tubes. The effects of multi-parameters on heat transfer and flow resistance are analyzed. Then, empirical correlations are developed for the Nusselt number and friction factor in the experimental ranges. Finally, the performance evaluation criterion of three-dimensional finned tube is revealed to be 2.7–2.9 times greater than that of the smooth tube. Meanwhile, the order of the four structural parametric effectiveness for the performance evaluation criterion is obtained as fin height > axial fin pitch > circular fin pitch > fin width.

Oscillations During Flow Boiling in Single Microchannels

Flow boiling of degassed double-distilled water in a single 50 × 50 μm and 100 × 50 μm microchannel was investigated on the basis of experimental measurements and high-speed visualization. The visualized events during boiling were analyzed in terms of the bubble frequencies and boiling front oscillations in microchannels. A digital image sequence analysis algorithm was composed to determine the time dependence of bubble and meniscus locations. The results show (i) the dynamic characteristics of boiling in microchannels, (ii) the increase of fundamental oscillation frequencies with increasing heat flux and temperature of the microchannel bottom, (iii) the amplitudes of the flow boiling oscillations are inversely proportional to the fundamental frequencies. The outcomes of the study are important as the oscillations during boiling in single microchannels are experimentally confirmed to be predictable in terms of oscillation frequencies and amplitudes trends and dependencies. This knowledge is especially significant at constructing efficient two-phase micro heat exchangers, micro mixers or micro reactors, as the cross section and the length of the channel become exceedingly important design parameters in micro devices with boiling.

Development of novel plate heat exchanger using natural graphite sheet

Natural flake graphite sheets have superior physical properties such as: high in-plate thermal conductivity (300–600 W·m−1·K−1), light weight (2.1 g·cm−3), negligible coefficient of thermal expansion and resistivity to corrosion under high temperatures. With the new roll-embossing process, fabrication of graphite sheets with different patterns has become fast and economical. These properties make natural graphite an excellent candidate for thermal applications, such as heat exchangers (HEXs), as an alternative to metallic alloys. This study presents a new fabrication method for chevron-type plate HEXs, as a proof-of-concept demonstration, using flat embossing process. To measure the performance of the proposed graphite plate heat exchanger, a custom-designed water-water experimental testbed is designed based on ANSI/AHRI Standard 400. The heat transfer rate and the pressure drop of the fabricated graphite plate heat exchanger are compared to a conventional stainless-steel chevron HEX with similar plate dimensions and number of plates. Compared with the commercially available unit, the proposed graphite plate heat exchanger shows identical thermal performance and a 26% higher pressure drop, due to its narrower channel design. This provide a promising platform for future optimized designs of efficient, corrosion-resistance, and cost-effective graphite-based heat exchangers for a number of industrial applications.

Performance of a hybrid photovoltaic/thermal system utilizing water‐Al 2 O 3 nanofluid and fins

Innovative hybrid solar panels combining photovoltaic cells along with an efficient heat exchanger with attached fins to the parallel plates and water-Al2O3 nanofluid as a working fluid is presented in this work. Twenty-seven fins at the upper wall and 27 fins at the lower wall in labyrinth arrangement are used in simulations with fin lengths of 0, ¼, ½, and ¾ of the flow path height. Moreover, nanosolid particles dispersed in the base fluid range as 0 ≤ ϕ ≤ 0.2. In addition, Reynolds number Re at the inlet was varied such that 10 < Re < 80. Numerical finite element analysis using COMSOL software is utilized to investigate flow and thermal characteristics as well the overall efficiency of the hybrid system. Results show that as the Reynolds number, the length of the fin, and the volume fraction of the nanosolid particles increase, the overall efficiency increases. Moreover, increasing nanoparticle volume fraction and the fin length was found to increase the friction coefficient.