Numerical analysis of Thermal, Fluid, and Electrical Performance of a Photovoltaic Thermal Collector at New Microchannels Geometry

2021 ◽  
pp. 1-35
Author(s):  
Siamak Hoseinzadeh ◽  
Davide Astiaso Garcia
Keyword(s):  
Cell Surface ◽  
Fluid Pressure ◽  
Electrical Performance ◽  
Fluid Temperature ◽  
Ansys Fluent ◽  
Simple Method ◽  
Fluent Software ◽  
Energy Equations ◽  
Volume Method ◽  
Upwind Method

Abstract In the present paper, different paths (direct, spiral, and curved) for water flow in a photovoltaic /thermal (PV/T) system are studied and they are compared together. The intensity of radiation to the cell surface is taken 800 W/m2, and the fluid flow is considered to be laminar in the microchannels. The PV cell absorbing radiation is of an aluminum type. The numerical solution of the three geometries is carried out using the finite volume method using ANSYS-Fluent software. The pressure decomposition, momentum and energy discretization, and the solution of the pressure-velocity coupling are performed based on the standard method, second-order upwind method, and the Semi-Implicit Method for Pressure Linked Equations (SIMPLE) method, respectively. The convergence factor is considered to be respected and for continuity and energy equations. The results indicate that the cell surface temperature and the outlet fluid temperature decrease by increasing the Reynolds (Re) number. Moreover, electricity efficiency increases with increased Reynolds number. The curved path has the highest electrical efficiency in compersion to the other two paths. The fluid pressure drop of the curved path in Re = 600 is 4% and 1.3% higher than the direct and spiral paths, respectively.

scholarly journals Solution of the conjugate problem of gas dynamics and heat transfer in structures with a large ratio of geometric scale values

2017 ◽  
pp. 69-74
Author(s):  
D. A. Romanyuk ◽  
S. V. Panfilov ◽  
D. S. Gromov
Keyword(s):  
Gas Dynamics ◽  
Software Package ◽  
Thermal State ◽  
Mathematical Formulation ◽  
Research Work ◽  
Conjugate Problem ◽  
Thermal Processes ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Volume Method

Within the scope of the research work, we have developed the methods and software package for solving the conjugate heat and hydraulic problems based on the classical approach to performing hydraulic calculations and modeling thermal processes by means of the finite volume method in the ANSYS Fluent software package. The developed means allowed us to efficiently calculate the thermal state of complex technical objects. The study gives mathematical formulation of the methods and suggests the results of their approbation and verification

scholarly journals CONSTRUCTAL DESIGN OF A TUBULAR ARRAY SUBJECTED TO FORCED CONVECTION

2015 ◽  
Vol 14 (1) ◽  
pp. 16
Author(s):  
V. A. Pedrotti ◽  
J. A. Souza ◽  
E. D. Dos Santos ◽  
L. A. Isoldi
Keyword(s):  
Thermal Performance ◽  
Mesh Generation ◽  
Constructal Theory ◽  
Forced Flow ◽  
Constructal Design ◽  
Fluent Software ◽  
Energy Equations ◽  
Volume Method ◽  
Study Setting ◽  
Tubular Array

In this work a tubular array (four tubes) subjected to a transverse forced flow is analyzed in terms of thermal performance. Taking into account that there are two main assembles usually used in heat exchanger equipment (aligned and staggered), and that there exist an uncountable number of possible assembles for an array of tubes, present work proposes to use the Constructal Theory to build an optimized assemble. The distance between tubes (p), and the region where tubes can be positioned are the geometric constraint of the problem. Four values for p were considered: p = 1.25D (tube diameter), p = 1.5D, p = 2D, p is free (no restriction). Fluid flow is considered bi-dimensional, incompressible and laminar with ReD = 10 and Pr = 0.71. Mass, momentum and energy equations were solved by the Finite Volume Method (FVM) using FLUENT software. Geometry creation and mesh generation were performed with GMSH software while VISIT software was used for the post processing. Results have shown that imposing no restriction to tube positioning do not necessarily lead to best system thermal performance. In this particular study, setting p = 2D has resulted in best thermal performance.

scholarly journals Modeling and Simulation of the Methane Risk in the Mining Production Process

2021 ◽  
Vol 4 (1) ◽  
pp. 1-13
Author(s):  
Dorota Palka
Keyword(s):  
Production Process ◽  
Mining Area ◽  
Hard Coal ◽  
Coal Seams ◽  
Ansys Fluent ◽  
Model Studies ◽  
Simulation Based ◽  
Huge Impact ◽  
Fluent Software ◽  
Volume Method

Abstract The mining production process is of particular importance for the area of Upper Silesia, as well as a very significant impact on the economy of the entire country. One of the most common and most dangerous threats to this process is the methane hazard. It is related to the presence of methane in coal seams, which under appropriate conditions is a flammable and explosive gas. Events related to the methane hazard constitute a huge threat to the life and health of the crew as well as the infrastructure and equipment of excavations. Therefore, they have a huge impact on the efficiency of the entire mining production process. In order to ensure the safety and continuity of the production process, it is necessary to prevent the formation of dangerous methane concentrations in the area covered by the operation. One of the tools that can be used to assess the state of methane hazard are model studies supported by numerical simulation. Based on these studies, the article analyzes the distribution of methane concentration in the mining area. This area included an actual mining excavation in one of the hard coal mines. The model tests were carried out with the use of the finite volume method in the ANSYS Fluent software. The obtained results can be used for preventive measures and constitute an important source of information for the assessment of the methane hazard state.

scholarly journals Thermal Performance Enhancement Using Absorber Tube with Inner Helical Axial Fins in a Parabolic Trough Solar Collector

2021 ◽  
Vol 11 (16) ◽  
pp. 7423
Author(s):  
Mohammad Zaboli ◽  
Seyed Soheil Mousavi Ajarostaghi ◽  
Seyfolah Saedodin ◽  
Mohsen Saffari Pour
Keyword(s):  
Performance Improvement ◽  
Thermal Performance ◽  
Performance Enhancement ◽  
Three Dimensional ◽  
Parabolic Trough ◽  
Ansys Fluent ◽  
Swirl Generator ◽  
Previous Part ◽  
Energy Equations ◽  
Volume Method

In the present work, a parabolic trough solar (PTC) collector with inner helical axial fins as swirl generator or turbulator is considered and analyzed numerically. The three-dimensional numerical simulations have been done by finite volume method (FVM) using a commercial CFD code, ANSYS FLUENT 18.2. The spatial discretization of mass, momentum, energy equations, and turbulence kinetic energy has been obtained by a second-order upwind scheme. To compute gradients, Green-Gauss cell-based method has been employed. This work consists of two sections where, first, four various geometries are appraised, and in the following, the selected schematic of the collector from the previous part is selected, and four various pitches of inner helical fins including 250, 500, 750 and 1000 mm are studied. All the numerical results are obtained by utilizing the FVM. Results show that the thermal performance improvement by 23.1% could be achieved by using one of the proposed innovative parabolic trough solar collectors compare to the simple one. Additionally, the minimum and maximum thermal performance improvement (compare to the case without fins) belong to the case with P = 250 mm by 14.1% and, to the case with P = 1000 mm by 21.53%, respectively.

Simulation of thermal distribution system of microsatellite equipped with FMC actuators

2020 ◽  
Vol 92 (10) ◽  
pp. 1505-1512
Author(s):  
Ahmad Soleymani ◽  
Mehran Nosratollahi
Keyword(s):  
Distribution System ◽  
Passive Control ◽  
Satellite System ◽  
Ansys Fluent ◽  
Simple Method ◽  
External Temperature ◽  
Content Type ◽  
Thermal Distribution ◽  
Research Fields ◽  
Fluent Software

Purpose The purpose of this paper is to simulate the thermal performance of fluidic momentum controller (FMC) actuators in two case, with and without thermal distribution system on a three-axis configuration of FMC actuators to an orbital period of satellite. The results show the effectiveness of using a storage with FMC actuators. Design/methodology/approach One of the challenges during a satellite’s orbital mission is unpredictable external temperature perturbations. This system used as a collaborative thermal subsystem for microsatellite temperature passive control. The operating principles of the system are that each fluid rings are used in a microsatellite surface with pumps to stabilize the satellite. All fluid rings are connected to the satellite thermal distribution system (storage). Findings Simulation results show that with using of thermal distribution system, damping of satellite different surfaces temperature is rapidly possible to the event of thermal disturbances. Practical implications Numerical simulation is obtained by ANSYS Fluent software and pressure-velocity coupling is SIMPLE method and spatial discretization is second order accurate and first order in time, viscous model is k-e. In this regard, a solver algorithm is also developed. Originality/value In space research fields about FMC application as actuators to satellite system design, main goal is to research about role of this system to attitude and determination control system (ADCS) of satellites, and no study is performed on its role to satellite temperature damping. This study is exclusively simulated thermal distribution system (includes a storage and its connections) of a microsatellite equipped with FMC actuators. The idea of using a storage for FMC actuators is the innovative step of this research.

scholarly journals CFD Analysis of Hybrid Solar Chimney Power Plant

2018 ◽  
Vol 225 ◽  
pp. 04011
Author(s):  
Mohammed A. Aurybi ◽  
Hussain H. Al-Kayiem ◽  
Syed I.U. Gilani ◽  
Ali A. Ismaeel
Keyword(s):  
Flue Gas ◽  
Navier Stokes ◽  
Discrete Ordinates ◽  
Hybrid Mode ◽  
Solar Chimney ◽  
Ansys Fluent ◽  
Novel Approach ◽  
Fluent Software ◽  
Solar Chimney Power Plant ◽  
Energy Equations

In this study, a novel approach has been proposed as a solar chimney integrated with an external heat source to extend the system operation during the absence of solar energy. Flue gas channels have been utilized to exchange heat with the air inside the collector of the solar chimney. The hybrid solar chimney has been investigated numerically by ANSYS-Fluent software, using discrete ordinates radiation model. The hybrid system was simulated in 3D, steady-state by solving Navier-Stokes and energy equations. The numerical results have been validated using experimental measurements of a conventional solar chimney. The influence of flue channels on the system performance was predicted and analyzed in hybrid mode. With 0.002 kg/s of flue gas at 100°C injected in flue channels during the daytime; hybrid mode results demonstrated enhancement of 24% and 9 % for velocity and temperature, respectively. The power generation was enhanced by 56%. It has been proved that the proposed technique is able to resolve the set back of night operation problem of the solar chimney plants.

scholarly journals Comparison of 2D Grid Simulations for Flow Past Cylinder at High Reynolds Numbers

2019 ◽  
Vol 15 (1) ◽  
pp. 70-78 ◽  
Author(s):  
Lenka Lausová ◽  
Ivan Kološ ◽  
Vladimíra Michalcová
Keyword(s):  
Reynolds Numbers ◽  
Wake Region ◽  
Mean Velocity ◽  
Ansys Fluent ◽  
Flow Past ◽  
Different Types ◽  
Fluent Software ◽  
The Mean ◽  
High Reynolds ◽  
Volume Method

Abstract The paper focuses on the verification of the suitability of the SST k - ω model on the flow past a circular cylinder in 2D for a high Reynolds number. The study compares the results of drag and lifts coefficients with respect to different types of meshes and time steps. The mean velocity field in the wake region behind the cylinder is evaluated and compared to experimental data available from literature. The numerical simulations are solved using CFD codes in the ANSYS Fluent software and use the finite volume method.

scholarly journals Numerical Study of Laminar Forced Convection of Nanofluid in a New Microchannel Heat Sink

2021 ◽  
Vol 71 (2) ◽  
pp. 31-40
Author(s):  
Bouhabel Bourhane ◽  
Kabar Yassine
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Heat Sink ◽  
Numerical Study ◽  
Microchannel Heat Sink ◽  
Ansys Fluent ◽  
Mixing Chamber ◽  
Fluent Software ◽  
Volume Method ◽  
Laminar Forced Convection

Abstract The heat transfer and pressure drop in a microchannel heat sink with 02 mixing chambers with inclined walls were numerically studied. The transport equations have been resolved by the finite volume method using ANSYS Fluent software. The operating fluids are water and Al2O3-water. The results obtained for Reynolds numbers ranging from 187 and 705 show that adding a micro-mixing chamber with a rectangular rib in the microchannel improves the heat transfer and increases the pressure drop compared to conventional microchannels. The new shape of the mixing chamber studied shows a net decrease in pressure drop, which improves the performance of the micro heat sink by 5.6%.

Thermal Behavior of Different Cooling Towers Using Induced Draught Cross Flow

2018 ◽  
pp. 73-88
Author(s):  
Rafid Hannun ◽  
Muntadhar Selman
Keyword(s):  
Thermal Behavior ◽  
Cooling Tower ◽  
Water Pressure ◽  
Cross Flow ◽  
Electrical Energy ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Volume Method ◽  
First Time ◽  
Electrical Energy Generation

Cooling tower is vastly utilized in industries as well as plants such electrical energy generation field and petrochemical industry to subtract the useless heat . In this paper, a thermal behavior of mechanical draft cross flow wet cooling tower is investigated .The theoretical study based on mathematical model of heat and mass transfer whose analyzed by ANSYS fluent software code employed workbench. Three new configurations of cooling tower are studied at the first time that didn’t studied together in literatures. They are cubic, cylindrical, and pyramid shape. The investigation used several inlet water temperature and different pressures of water at inlet and outlet. The numerical solution is based on the finite volume method. The wet bulb temperature of air has constant value for all cases whose studied . The results of study indicated that the cylindrical configuration is the best geometry. When inlet water pressure get up at constant other variables, the performance is decreased as well as it will improved if it reduces. The water cooling range has no influence on the tower characteristics.

Performance Analysis of the Small-Scale α-Type Stirling Engine Using Computational Fluid Dynamics Tools

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Zbigniew Buliński ◽  
Ireneusz Szczygieł ◽  
Adam Kabaj ◽  
Tomasz Krysiński ◽  
Paweł Gładysz ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Model ◽  
Stirling Engine ◽  
Coefficient Of Performance ◽  
Navier Stokes ◽  
Small Scale ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Energy Equations

This paper presents the computational fluid dynamics (CFD) model of small-scale α-type Stirling engine. The developed mathematical model comprises of unsteady Reynolds averaged Navier–Stokes set of equations, i.e., continuity, momentum, and energy equations; turbulence was modeled using standard κ–ω model. Moreover, presented numerical model covers all modes of heat transfer inside the engine: conduction, convection, and radiation. The model was built in the framework of the commercial CFD software ANSYS fluent. Piston movements were modeled using dynamic mesh capability in ANSYS fluent; their movement kinematics was described based on the crankshaft geometry and it was implemented in the model using user-defined functions written in C programming language and compiled with a core of the ANSYS fluent software. The developed numerical model was used to assess the performance of the analyzed Stirling engine. For this purpose, different performance measures were defined, including coefficient of performance (COP), exergy efficiency, and irreversibility factor. The proposed measures were applied to evaluate the influence of different heating strategies of the small-scale α-type Stirling engine.

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