Air flow distribution measurement of the vehicle cooling system test rig

2019 ◽  
Author(s):  
J. H. Lee ◽  
Z. A. Latiff ◽  
M. R. M. Perang ◽  
M. F. M. Said
Keyword(s):  
Cooling System ◽  
Air Flow ◽  
Flow Distribution ◽  
Test Rig ◽  
Distribution Measurement

Effect of Fan Speed on Air Flow Through a Green Wall Module

2018 ◽  
Author(s):  
Peter Abdo ◽  
B. P. Huynh ◽  
Vahik Avakian
Keyword(s):  
Cooling System ◽  
Air Flow ◽  
Flow Distribution ◽  
Active Systems ◽  
System A ◽  
Particulate Pollutants ◽  
Back Face ◽  
Flow Through ◽  
Fan Speed ◽  
Wall System

Green or living walls are active bio-filters developed to enhance air quality. Often, these walls form the base from which plants are grown; and the plant-wall system helps to remove both gaseous and particulate air pollutants. They can be classified as passive or active systems. The active systems are designed with ventilators which force air through the substrate and plant rooting system, therefore the air is purified and filtered through a bio-filtration process which also acts as a natural cooling system. A fan positioned at a central opening on the module’s back face drives air through the medium-plant-roots mix and then onward through the plants’ canopy; and these would help to remove both gaseous and particulate pollutants from the air. Pressure drop across the module, air flow distribution through it as well as the total flow rate have been obtained. The effect of different fan speeds on the total air flow and on its distribution through the module is investigated in this study in order to optimize the energy consumption of the fans whilst maintaining the modules biofiltration efficiency.

Numerical and Experimental Analysis for Air Circulation and Cooling Performance in a Cell Cabinet

2007 ◽  
Author(s):  
Jiahui Zhang ◽  
Jason Waggel ◽  
Dave Weber ◽  
Tony Pollice
Keyword(s):  
Heat Exchanger ◽  
Cooling System ◽  
Air Flow ◽  
Flow Distribution ◽  
Simulation Models ◽  
Cooling Capacity ◽  
Air Cooling ◽  
Application Range ◽  
A Cell ◽  
Air Circulation

In liquid-cooled large drives, controlling air temperature and maintaining air circulation is very important to the lifetime and functions of electrical and electronic components in power cell cabinet. In application, air/water heat exchangers and associated fans are employed to cool the air and force it through the cells. A computational fluid dynamics (CFD) analysis is performed to predict the air circulation in cell cabinet. The results are applied in air baffle arrangement to obtain an ideal air flow distribution. A fundamental analysis is conducted for heat exchanger and its thermal performance defined. It is found that the air supply temperature from heat exchanger is almost independent of air flow rate and altitude within application range. A thermal model is developed to simulate air temperatures into and out of cell cabinet heat exchanger for evaluating its cooling capacity. Flow and heat-run tests are performed for a cell cabinet. The testing results prove that the simulation models are accurate, and the developed air-cooling system can satisfy cooling requirement. A parametric study is complemented with the simulation models to guide cooling management regarding variations in operational and environmental conditions.

scholarly journals Influence of the distance from an obstacle to the outlet pipe of the radiator fan case of the automotive engine cooling system on the distribution of air flow

2021 ◽  
Vol 18 (5) ◽  
pp. 143-149
Author(s):  
N. V. Holshev ◽  
◽  
D. N. Konovalov ◽  
S. M. Vedishchev ◽  
A. V. Milovanov ◽  
...  
Keyword(s):  
Cooling System ◽  
Air Flow ◽  
Flow Distribution ◽  
Response Surfaces ◽  
Laboratory Installation ◽  
Automotive Engine ◽  
Engine Cooling ◽  
Outlet Pipe ◽  
Optimal Distance ◽  
Air Flow Velocity

The article presents the methodology and results of the study of the influence of the distance from the obstacle to the cut of the outlet pipe of the fan case of the cooling system of the automobile engine on the nature of the air flow distribution in front of the radiator. The studies were carried out on a specially made laboratory installation that provides measurement of the air flow velocity at fixed points in front of the radiator. As a result of the research, there were obtained response surfaces that describe the distribution of the air flow in front of the radiator at different distances from the obstacle to the outlet of the fan case. On this basis, there was determined the optimal distance from the obstacle, which provides the most uniform radiator blowing.

scholarly journals Approbation of the Laser Doppler Anemometer Lad-08 on the Secondary Standard Test Rig for Air Flow Speed

2020 ◽  
Vol 1675 ◽  
pp. 012082
Author(s):  
I K Kabardin ◽  
V G Meledin ◽  
S V Dvoinishnikov ◽  
V A Pavlov ◽  
G V Bakakin ◽  
...  
Keyword(s):  
Air Flow ◽  
Flow Speed ◽  
Standard Test ◽  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Secondary Standard ◽  
Test Rig

Perimeter Cooling Unit and Localized Row-Based Cooling Unit Transient Air Flow Effects Modeling and Characterization in Data Centers

2015 ◽  
Author(s):  
Tianyi Gao ◽  
James Geer ◽  
Bahgat G. Sammakia ◽  
Russell Tipton ◽  
Mark Seymour
Keyword(s):  
Thermal Management ◽  
Data Center ◽  
Data Centers ◽  
Cooling System ◽  
Air Flow ◽  
Cooling Systems ◽  
Dynamic Thermal Management ◽  
Hybrid Cooling ◽  
Cooling Unit ◽  
Cooling Air

Cooling power constitutes a large portion of the total electrical power consumption in data centers. Approximately 25%∼40% of the electricity used within a production data center is consumed by the cooling system. Improving the cooling energy efficiency has attracted a great deal of research attention. Many strategies have been proposed for cutting the data center energy costs. One of the effective strategies for increasing the cooling efficiency is using dynamic thermal management. Another effective strategy is placing cooling devices (heat exchangers) closer to the source of heat. This is the basic design principle of many hybrid cooling systems and liquid cooling systems for data centers. Dynamic thermal management of data centers is a huge challenge, due to the fact that data centers are operated under complex dynamic conditions, even during normal operating conditions. In addition, hybrid cooling systems for data centers introduce additional localized cooling devices, such as in row cooling units and overhead coolers, which significantly increase the complexity of dynamic thermal management. Therefore, it is of paramount importance to characterize the dynamic responses of data centers under variations from different cooling units, such as cooling air flow rate variations. In this study, a detailed computational analysis of an in row cooler based hybrid cooled data center is conducted using a commercially available computational fluid dynamics (CFD) code. A representative CFD model for a raised floor data center with cold aisle-hot aisle arrangement fashion is developed. The hybrid cooling system is designed using perimeter CRAH units and localized in row cooling units. The CRAH unit supplies centralized cooling air to the under floor plenum, and the cooling air enters the cold aisle through perforated tiles. The in row cooling unit is located on the raised floor between the server racks. It supplies the cooling air directly to the cold aisle, and intakes hot air from the back of the racks (hot aisle). Therefore, two different cooling air sources are supplied to the cold aisle, but the ways they are delivered to the cold aisle are different. Several modeling cases are designed to study the transient effects of variations in the flow rates of the two cooling air sources. The server power and the cooling air flow variation combination scenarios are also modeled and studied. The detailed impacts of each modeling case on the rack inlet air temperature and cold aisle air flow distribution are studied. The results presented in this work provide an understanding of the effects of air flow variations on the thermal performance of data centers. The results and corresponding analysis is used for improving the running efficiency of this type of raised floor hybrid data centers using CRAH and IRC units.

Experimental investigation of the air flow in a simplified underhood environment

2021 ◽  
pp. 095440702110597
Author(s):  
Randi Franzke ◽  
Simone Sebben ◽  
Emil Willeson
Keyword(s):  
Flow Field ◽  
Laser Doppler Anemometry ◽  
Fluid Dynamic ◽  
Air Flow ◽  
Measurement Data ◽  
Quality Measurement ◽  
Flow Distribution ◽  
Lateral Position ◽  
Reference Case ◽  
Lateral Direction

In this paper, a simplified underhood environment is proposed to investigate the air flow distribution in a vehicle-like set-up and provide high quality measurement data that can be used for the validation of Computational Fluid Dynamic methods. The rig can be equipped with two types of front openings representative for electrified vehicles. Furthermore, it is possible to install differently shaped blockages downstream of the fan to imitate large underhood components. The distance between the blockages and the fan can be varied in longitudinal and lateral direction. The measurements are performed with Laser Doppler Anemometry at a fixed distance downstream of the fan. The results show that the lack of an upper grille opening in the configuration for a battery electric vehicle has a notable impact on the flow field in the reference case without any downstream blockage. However, the differences in the flow field between the two front designs become less when a downstream obstruction is present. The longitudinal and lateral position of the blockages have a minor impact on the flow field compared to the shape of the obstacle itself.

scholarly journals Measurement of Air Flow Outside a Burning Cigarette during a Puff using Particle Image Velocimetry

2004 ◽  
Vol 21 (4) ◽  
pp. 216-222
Author(s):  
A Nagao ◽  
K Miura ◽  
S Kitao ◽  
M Horio
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Air Flow ◽  
Maximum Velocity ◽  
Flow Distribution ◽  
Combustion Mechanism ◽  
Air Flow Rate ◽  
Tracer Particles ◽  
Image Velocimetry ◽  
Cigarette Paper

AbstractIn order to clarify the mechanism for the generation of cigarette smoke, the combustion mechanism of a burning cigarette during a puff was investigated by focusing on air transfer. In particular, the air flow distribution outside a burning cigarette was observed and related to the aerodynamic effects of the cigarette paper and the puffing rate. The air flow rate was measured by Particle Image Velocimetry (PIV), using olive oil droplets as the tracer particles. It was found that air does not flow into the tip of the burning cigarette and that the air flow was concentrated at the region -2 to 2 mm around the cigarette paper char-line. This behavior was independent of the cigarette paper basis weight. When the puffing rate was changed from 2.5 to 35 mL/s, the air flow was concentrated at a region close to the cigarette paper char-line and the maximum velocity around the cigarette paper char-line increased with the puffing rate.

scholarly journals Automobile Radiator’s Engineering and Analysation

2020 ◽  
Vol 9 (5) ◽  
pp. 554-558
Keyword(s):  
Flow Rate ◽  
Heat Dissipation ◽  
Cooling System ◽  
Volume Flow Rate ◽  
Air Flow ◽  
Temperature Drop ◽  
Inlet Temperature ◽  
Air Flow Rate ◽  
Air Velocity ◽  
Cooling Fan

The shape of a radiator cover is crucial either in determining the pattern of air flow or in increasing the same through the radiator core thereby increasing the thermal efficiency, thus making it a necessity to understand it. Moreover the parts circumjacent to the core namely the upper tank, lower tank, cooling fan, fins, tubes, etc promote the air flow rate. Also it is to note that the air flow rate of discharge gases from radiator core is one of the prime factors in determining the automobile cooling system. Initially factors such as temperature, pressure, air flow rate that affect the performance are obtained in order to derive out the entities of operation. One of the observations that can be made through this paper is that as the volume of the coolant increases, the rate of heat dissipation increases, also parameters like inlet temperature and volume flow rate of coolant, air velocity, temperature drop and drop in pressure of coolant are factors that contribute in radiator performance evidently.

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