Pseudodynamic test and numerical simulation of a large direct air-cooling structure

2014 ◽  
Vol 24 (4) ◽  
pp. 280-299 ◽  
Author(s):  
Yazhou Xu ◽  
Guoliang Bai ◽  
Jianing Zhu
Keyword(s):  
Numerical Simulation ◽  
Air Cooling ◽  
Pseudodynamic Test

Numerical Simulation on the Temperature Characteristics of Indirect Air Cooling System

2015 ◽  
Vol 741 ◽  
pp. 536-540
Author(s):  
Xiao Zhi Qiu ◽  
Yan Ming Zhao ◽  
Bao Hua Huang ◽  
Wei Xu
Keyword(s):  
Numerical Simulation ◽  
Wind Speed ◽  
Cooling System ◽  
System Change ◽  
Temperature Characteristic ◽  
Air Cooling ◽  
Ansys Software ◽  
System A ◽  
Air Cooling System ◽  
Simulation Results

Based on the analysis of indirect air cooling system, a numerical simulation model of indirect air cooling system was constructed by ANSYS software. According to the different wind speed condition, the temperature characteristic of indirect air cooling system was analyzed. The simulation results show that with the increase of wind speed, the ventilation and heat release of the indirect air cooling system change greatly. It provides a theoretical basis for the design of the wind-proof device of indirect air cooling system.

scholarly journals Numerical Simulation of the Air Cooling System for Scientific Payload Rack on a Space Station

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 6145
Author(s):  
Yuan-Yuan Lou ◽  
Ben-Yuan Cai ◽  
Yun-Ze Li ◽  
Jia-Xin Li ◽  
En-Hui Li
Keyword(s):  
Numerical Simulation ◽  
Cooling System ◽  
Space Station ◽  
Thermal Control ◽  
Physical Models ◽  
Air Cooling ◽  
Ansys Fluent ◽  
System A ◽  
Air Cooling System ◽  
Scientific Payload

The space scientific payload rack is a multifunctional experimental platform, and the requirements of the environmental temperature index are different for diversified experimental modules inside. The air cooling system is an important part of the rack thermal control system. A new type of air cooling system with small size and flexible arrangement is proposed in this paper, that is, micro air ducts with pinhole-sized air vents. The rack physical models of new and traditional air cooling modes are established, respectively. The numerical simulation of the inner air flow is carried out by Ansys Fluent CFD software (Ansys Inc., Canonsburg, PA, USA), which verifies that compared with the traditional method, the temperature field and flow field of the new air cooling method are more uniform, and the heat sources located at the edge of the rack can also be cooled better.

scholarly journals Use of experimental and numerical simulation methods for rational design of the air cooling apparatus for lubrication systems of compressors

2020 ◽  
Vol 65 (2) ◽  
pp. 215-223
Author(s):  
M. V. Gureev ◽  
I. I. Khabibullin ◽  
A. N. Skrypnik ◽  
G. S. Marshalova ◽  
I. A. Popov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Heat Exchange ◽  
Thermal Performance ◽  
Rational Design ◽  
Computational Time ◽  
Computational Techniques ◽  
Air Cooling ◽  
Simulation Methods ◽  
Oil Cooler ◽  
Numerical Simulation Methods

The objective of the present work was to study heat and hydraulic parameters of an air cooling apparatus of oil (ACAO), whose geometry of its flow-through part is changed to decrease hydraulic losses in its air conduit and to increase the cooling efficiency of oil. Using numerical simulation methods of heat transfer, we have developed and tested the computational techniques applied in a wide class of heat exchange apparatuses, including those consisting of the sections of finned flat tubes manufactured by extrusion with subsequent deforming cutting. We have proposed to make a finned part of a heat-exchange surface in the form of porous inserts. This has allowed us to reduce numerical simulation equipment requirements and to decrease computational time. Predicted results well agree with experimental data; their analysis shows that the calculated value of thermal performance of the oil cooler due to the revealed construction drawbacks of the air conduit is by 19 % less than that of the designed one. Based on the results of the numerical simulation studies, a number of recommendations have been made how to improve the layout inside the air cooling apparatus for oil in order to enhance its thermal performance and aerodynamic quality. In particular, we have proposed to mount new fan blades to enhance its performance; to change the construction of the air outlet valve by taking away a baffle that partially overshadows the exit area of the bottom fan; to modify the shape of the bottom collector of the oil cooler in order to make a uniform velocity profile at the entrance of cooling sections. Connecting in series heat exchange sections may be a perspective engineering decision. The outcomes of all proposed engineering decisions can be assessed by numerical simulation methods that will allow us not to design expensive equipment.

Optimization of Natural Air Cooling in a Vertical Channel of Electronic Equipment

2010 ◽  
Author(s):  
Yasushi Nishino ◽  
Masaru Ishizuka ◽  
Tomoyuki Hatakeyama ◽  
Shinji Nakagawa
Keyword(s):  
Numerical Simulation ◽  
Channel Model ◽  
Vertical Channel ◽  
Electronic Equipment ◽  
Air Cooling ◽  
Measured Temperature ◽  
Model Following ◽  
Image Velocimetry ◽  
Convection Cooling ◽  
Copper Wall

The natural convection cooling capability in a compact item of electronic equipment was investigated quantitatively by experiment and numerical simulation with a simple channel model. The optimization of the channel sizes, especially the clearance between heated walls, was discussed. The channel model, which consists of a vertical duct of rectangular section, was applied as the experimental model of electronic equipment in this study. The channel model consists of two heated copper walls and two transparent acrylic walls. The clearance between the copper walls of the channel was varied from 5 mm to 15 mm. Temperature measurement on the copper wall surfaces and velocity measurement of natural air flow in the channel by using a particle image velocimetry (PIV) were conducted for a few clearances of the channel. Numerical simulation was also carried out, with a model following the experimental setup, for more detailed discussion of various clearances of the channel. The relationship between the clearance and the temperature rise of the walls or velocity profile was investigated. The correlation between the Rayleigh number and the Nusselt number was obtained from measured temperature. The natural cooling capability and the velocity profiles depend on the clearance between the copper walls. When the wall clearances are more than 15 mm, the cooling is not enhanced. On the other hand, in the case that the clearance becomes less than 7 mm, the cooling capability becomes significantly lower. Consequently, it is clarified that the clearance from 8 mm to 10 mm is the best size for natural cooling from the view point of the space and the capability.

Numerical Simulation on Adding Chamfer Angle of Direct Air Cooling Exhausted Duct for Large Thermal Power Generator

2014 ◽  
Vol 501-504 ◽  
pp. 2288-2292
Author(s):  
Chun Qing Wang ◽  
Cai Xia Bian
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Flow Resistance ◽  
Thermal Power ◽  
Air Cooling ◽  
Duct System ◽  
Power Generator ◽  
Power Generating Unit ◽  
Computational Fluid Dynamics Cfd ◽  
Balanced Flow

The optimal design for exhausted ducting mode and internal structure in direct cooling exhausted duct system influence every steam to assign the flow obstruction and flow while managing to assign directly.The flowing filed of steam in direct air cooling exhausted duct for 1000MW power generating unit is simulated via Computational Fluid Dynamics(CFD) software under typical steam turbine conditions,and the best chamfer angle can be get by adding different chamfer angles in back of exhaust pipe.The result shows that the steam flows through each distribution pipe with balanced flow under the condition of chamfer angle of 30 °and the flow resistance is much lower than before

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