A computational fluid dynamics (CFD) coupled multi-objective optimization framework for thermal system design for Li-ion batteries with metal separators

2021 ◽  
pp. 1-19
Author(s):  
Xujian Cui ◽  
Siqi Chen ◽  
Mi Xiao ◽  
Wei Li
Keyword(s):  
Fluid Dynamics ◽  
Thermal Conductivity ◽  
Air Temperature ◽  
Heat Dissipation ◽  
Battery Pack ◽  
Cooling Efficiency ◽  
Multi Objective Optimization ◽  
Optimization Framework ◽  
Computational Fluid Dynamics Cfd ◽  
Temperature Standard

Abstract Battery thermal management system (BTMS) has significant impacts on the performance of electric vehicles (EVs). In this research, a computational fluid dynamics (CFD) coupled multi-objective optimization framework is proposed to improve the thermal performance of the battery pack having metal separators. CFD is utilized to study the thermal and fluid dynamics performance of the designed battery pack. Input parameters include inlet air temperature, thermal conductivity of coolant, thermal conductivity of metal separator, and diameter of heat dissipation hole. Five vital output parameters are maximum temperature, average temperature, temperature standard deviation, maximum pressure, and volume of the pack. The support vector machine (SVM) model is used to replace the real output parameters of the battery pack. Sensitivity analysis results indicate that the diameter of heat dissipation hole is the main factor affecting the volume of the structure and the pressure drop, while the inlet air temperature has significant influence on the battery pack thermal behavior. The cooling efficiency and the uniformity of temperature distribution are mainly determined by the inlet air temperature. The decrease of inlet air temperature could lead to a rise of temperature standard deviation. The non-dominated sorting genetic algorithm II (NSGAII) is taken to acquire the optimum set of input parameters. The obtained optimal scheme of battery pack can improve the cooling efficiency as well as reducing the volume cost and the energy consumption of the cooling system while such design may result in a higher level of non-uniformity of the temperature and pressure distribution.

Efficient Heat Dissipation Design of High-Power Multi-Chip Cob Package Led Modules

2012 ◽  
Vol 463-464 ◽  
pp. 1332-1340 ◽  
Author(s):  
Lei Wu ◽  
Xiao Yun Xiong ◽  
De Xing Wang
Keyword(s):  
Thermal Conductivity ◽  
Forced Convection ◽  
High Power ◽  
Heat Dissipation ◽  
Heat Sinks ◽  
Junction Temperature ◽  
Ir Camera ◽  
Chip Size ◽  
Computational Fluid Dynamics Cfd ◽  
Convection Cooling

In this study, the junction temperature (Tj) and thermal resistance (Rth) of five high-power multi-chip COB (chip-on-board) LED packages with different chip spacings were compared. The actual Tjwas measured by an IR camera and compared with the simulation results from a computational fluid dynamics (CFD) software. In addition, the effects of heat slugs with different thermal conductivity, heat sinks of various thicknesses, chip size, and forced convection cooling on the Tjand Rthof high-powered LED components were investigated. The experimental results show that smaller chip spacing resulted in higher Tjand Rth. The heat dissipation performance can be improved by using a heat slug with a high thermal conductivity; and increasing the thickness of the heat sink, or employing forced convection cooling.

scholarly journals Experimental verification of a CFD model for the closed plant factory under artificial lighting

2020 ◽  
Vol 213 ◽  
pp. 03013
Author(s):  
Wei Lu ◽  
Yiwen Hu ◽  
Shenghan Zhou ◽  
Xin Zhang ◽  
Quan Yuan ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Air Temperature ◽  
Experimental Verification ◽  
Cfd Model ◽  
Air Velocity ◽  
Artificial Lighting ◽  
Mean Relative Error ◽  
Plant Factory ◽  
Computational Fluid Dynamics Cfd ◽  
The Mean

A computational fluid dynamics (CFD) model for the closed plant factory under artificial lighting has been developed in this study, the experimental verification of CFD model with the air velocity value was compared with the measured air temperature value. The results showed that the mean relative error of validation with the air velocity was 15%, and comparable with experimentally observed air temperature profile inside the plant factory with RMSE of 3% which show the utility of CFD to study plant factory microclimatic parameters.

scholarly journals Investigation of Production of Nanofiber Nonwoven Fabric and its Thermal Properties

2020 ◽  
Vol 14 (2) ◽  
pp. 264-273
Author(s):  
Wei Wu ◽  
Kenichi Urabe ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Hiroyoshi Sota ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Dissipation ◽  
Thermal Characteristics ◽  
Nonwoven Fabric ◽  
Melt Blowing ◽  
One Dimensional ◽  
Manufacturing Method ◽  
Apparent Thermal Conductivity ◽  
Computational Fluid Dynamics Cfd ◽  
Lateral Heat

Nanofibers of polypropylene were produced by a modified melt-blowing method. The manufacturing method and thermal characteristics of fabricated nonwoven-fabric nanofibers were studied. Apparent thermal conductivity was measured as an evaluation of adiabatic properties, and a prediction model was developed with computational fluid dynamics (CFD) based on a one-dimensional computer-aided engineering method. In addition, we attempted to evaluate true thermal conductivity in consideration of lateral heat dissipation during measurement by thickness. Consequently, we determined the influence of the fiber diameter and thickness of the nonwoven fabric on the thermal conductivity and demonstrated that the proposed CFD model was effective for estimating the characteristics of the thermal conductivity of the nonwoven fabric.

Study of Heat Rejection in Triple Natural Draft Dry Cooling Towers under Crosswind Using Radiator-Type Windbreakers

2014 ◽  
Vol 598 ◽  
pp. 265-270 ◽  
Author(s):  
Amir Hozhabr ◽  
Ramin Radi ◽  
Hossein Chenari ◽  
Arash Chogani ◽  
Masoud Esmaeelipour
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Cooling Tower ◽  
Independent Solution ◽  
Numerical Results ◽  
Cooling Towers ◽  
Cooling Efficiency ◽  
Natural Draft ◽  
Computational Fluid Dynamics Cfd ◽  
Dry Cooling

In this paper, the effect of crosswind on triple natural draft dry cooling towers is studied and analyzed. Concerning this area, many researches have concentrated on one cooling tower. This research focuses on the mutual effects of the adjacent towers' performance, and also makes a comparison between the efficiency of the three cooling towers in windy and no-wind conditions, using Computational Fluid Dynamics (CFD). In modeling the crosswind condition, at first solid windbreakers, and then radiator-type windbreakers are used for each cooling tower. Finally, the water outlet temperatures of the radiators' cooling towers are analyzed, and the total heat rejections at different conditions are compared. Numerical results show that radiator-type windbreakers can substantially improve cooling efficiency more than usual solid-types. It should be mentioned that a complete grid study is done to achieve a grid-independent solution.

scholarly journals Thermal and Flow Simulation of Concentric Annular Heat Pipe with Symmetric or Asymmetric Condenser

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3333
Author(s):  
Eui-Hyeok Song ◽  
Kye-Bock Lee ◽  
Seok-Ho Rhi
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Heat Pipe ◽  
Thermal Performance ◽  
Heat Dissipation ◽  
Cfd Simulation ◽  
Research Work ◽  
Experimental Results ◽  
Working Fluid ◽  
Computational Fluid Dynamics Cfd

The current research work describes the flow and thermal analysis inside the circular flow region of an annular heat pipe with a working fluid, using computational fluid dynamics (CFD) simulation. A two-phase flow involving simultaneous evaporation and condensation phenomena in a concentric annular heat pipe (CAHP) is modeled. To simulate the interaction between these phases, the volume of fluid (VOF) technique is used. The temperature profile predicted using computational fluid dynamics (CFD) in the CAHP was compared with previously obtained experimental results. Two-dimensional and three-dimensional simulations were carried out, in order to verify the usefulness of 3D modeling. Our goal was to compute the flow characteristics, temperature distribution, and velocity field inside the CAHP. Depending on the shape of the annular heat pipe, the thermal performance can be improved through the optimal design of components, such as the inner width of the annular heat pipe, the location of the condensation part, and the amount of working fluid. To evaluate the thermal performance of a CAHP, a numerical simulation of a 50 mm long stainless steel CAHP (1.1 and 1.3 in diameter ratio and fixed inner tube diameter (78 mm)) was done, which was identical to the experimental system. In the simulated analysis results, similar results to the experiment were obtained, and it was confirmed that the heat dissipation was higher than that of the existing conventional heat pipe, where the heat transfer performance was improved when the asymmetric area was cooled. Moreover, the simulation results were validated using the experimental results. The 3-D simulation shows good agreement with the experimental results to a reasonable degree.

scholarly journals RECESSED BALCONY HEAT RE-ENTRY EFFECT ON FAÇADE WITH CONDENSER UNITS

2021 ◽  
Vol 48 (1) ◽  
pp. 29-36
Author(s):  
Kevin Yonathan Tanumidjaja ◽  
Danny Santoso Mintorogo ◽  
Rully Damayanti
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Indoor Air ◽  
Heat Dissipation ◽  
Energy Performance ◽  
Cfd Analysis ◽  
Air Conditioner ◽  
Architectural Elements ◽  
Air Movement ◽  
Computational Fluid Dynamics Cfd

The use of split-type air conditioner in Surabaya results in the almost universal typical apartment layouts which feature a recessed balcony upon the building’s exterior façade which then utilized as air-conditioner condenser unit storage. Façade geometry with recessed balcony itself carries its own characteristic of surface air movement which affects the general Indoor Air Quality (IAQ) and heat dissipation of a building. Nevertheless, façade as architectural elements greatly influence building’s energy performance. Inefficiencies in heat dissipation from a condenser unit is detrimental on its performance and precipitate energy wastage. Based on computational fluid dynamics (CFD) analysis incorporated with energy performance evaluation, the effectiveness of façade geometry with recessed balcony is explored in this paper. It was found that recessed balconies are not an ideal place for condenser unit placement on a façade where many factors contributed to promoting heat re-entry from condenser units into the building’s interior.

Evaluation of Water Cooling System of 1.5MW Rotor Based on CFD

2012 ◽  
Vol 472-475 ◽  
pp. 386-390
Author(s):  
Ming Qin ◽  
Hai Tao Dai ◽  
Ming Wei Ge
Keyword(s):  
Fluid Dynamics ◽  
Thermal Conductivity ◽  
Heat Exchange ◽  
Cooling System ◽  
Cooling Water ◽  
Water Cooling ◽  
Design Requirement ◽  
Computational Fluid Dynamics Cfd ◽  
Water Cooling System ◽  
Cooling Pipes

The water cooling system of 1.5MW rotor is evaluated using Computational Fluid Dynamics (CFD). 48 cooling holes are opened on the rotor stator to arrange the water cooling pipes, the temperature of inlet of the cooling water is 50 C with the velocity 1.2m/s. It is found that the air gap between the cooling pipes and holes on the stator hinders the heat exchange extensively. For this reason, the cooling system can't meet the design requirement. In order to solve this problem, the pourable silicone is filled in the gap between the cooling pipes and holes to enhance thermal conductivity. Based on this idea, ten kinds of piping arrangements are proposed, among which, nine kinds can achieve the cooling requirement.

scholarly journals Thermal Modeling of a Mini Rotor-Stator System

2009 ◽  
Author(s):  
Emre Dikmen ◽  
Peter van der Hoogt ◽  
Andre´ de Boer ◽  
Ronald Aarts ◽  
Ben Jonker
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Thermal Model ◽  
High Speed ◽  
Heat Dissipation ◽  
Complete System ◽  
Temperature Dependent ◽  
Lumped Parameter ◽  
Ansys Cfx ◽  
Computational Fluid Dynamics Cfd

In this study the temperature increase and heat dissipation in the air gap of a cylindrical mini rotor stator system has been analyzed. A simple thermal model based on lumped parameter thermal networks has been developed. With this model the temperature dependent air properties for the fluid-rotor interaction models have been calculated. Next the complete system has also been modeled by using computational fluid dynamics (CFD) with Ansys-CFX and Ansys. The results have been compared and the capability of the thermal networks method to calculate the temperature of the air between the rotor and stator of a high speed micro rotor has been discussed.

scholarly journals Thermal comfort study of plastics manufacturing industry in converting process

2017 ◽  
Vol 26 (3) ◽  
pp. 401-411
Author(s):  
Sugiono Sugiono ◽  
Ryan Fardian ◽  
Oyong Novareza
Keyword(s):  
Fluid Dynamics ◽  
Thermal Comfort ◽  
Air Temperature ◽  
Manufacturing Industry ◽  
Cfd Simulation ◽  
Vote Model ◽  
Building Process ◽  
Clear Glass ◽  
Computational Fluid Dynamics Cfd ◽  
Maximum Air Temperature

Thermal comfort is one of ergonomics factors that can create a significant impact to workers performance. For a better thermal comfort, several environment factors (air temperature, wind speed and relative humidity) should be considered in this research. The object of the study is a building for converting process of plastics manufacturing industry located in Malang, Indonesia. The maximum air temperature inside the building can reach as high as 36°C. The result of this study shows that heat stress is dominantly caused by heat source from machine and wall building. The computational fluid dynamics (CFD) simulation is used to show the air characteristic through inside the building. By using the CFD simulation, some scenarios of solution are successfully presented. Employees thermal comfort was investigated based on predicted mean vote model (PMV) and predicted percentage of dissatisfied model (PPD). Existing condition gives PMV in range from 1.83 to 2.82 and PPD in range from 68.9 to 98%. Meanwhile, modification of ventilation and replacing ceiling material from clear glass into reflective clear glass gave significant impact to reduce PMV into range from 1.63 to 2.18 and PPD into range from 58.2 to 84.2%. In sort, new design converting building process has more comfortable for workers.

The Impact of Different Types of Permeable Pavement Utilization on Air Temperature above the Pavement

2013 ◽  
Vol 723 ◽  
pp. 678-685 ◽  
Author(s):  
Jyh Dong Lin ◽  
Chen Yu Hsu ◽  
Andika Citraningrum ◽  
Putri Adhitana
Keyword(s):  
Fluid Dynamics ◽  
Air Temperature ◽  
Asphalt Concrete ◽  
Cfd Simulation ◽  
Concrete Block ◽  
Permeable Pavement ◽  
Different Types ◽  
Computational Fluid Dynamics Cfd ◽  
The Impact

This study investigate permeable pavement utilization and its impact on air temperature by using site measurement, statistical analysis, and Computational Fluid Dynamics (CFD) simulation. National Central University (NCU) main library is the case study for the simulations. Simulations on five pavement types (dense grade asphalt concrete/DGAC, permeable asphalt concrete/PAC, concrete, permeable interlocking concrete block/PICB, and grass block) shows that grass block and PICB can reduce air temperature, while three others increase air temperature.

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