A CFD Analysis of Telecommunication Racks, Including Effects of Air Filter Locations

2005 ◽  
Author(s):  
L. T. Yeh ◽  
B. T. F. Chung ◽  
Joseph Yeh
Keyword(s):  
Air Flow ◽  
Flow Analysis ◽  
Flow Distribution ◽  
System Level ◽  
Cfd Analysis ◽  
Failure Condition ◽  
Commercial Software ◽  
Air Filter ◽  
Level Analysis

A CFD thermal and air flow analysis is performed for a given telecommunication rack. The commercial software, Flotherm, is employed to perform the system level analysis. The analysis is made to examine the effects of the air filter locations at the upstream and downstream of the fans on the flow distribution within the system. The analysis is then extended to the case with one-fan failure condition.

Analysis and Design of a Lightweight High Specific Power Two-Stroke Polygon Engine

2013 ◽  
Vol 136 (4) ◽  
Author(s):  
K. R. Anderson ◽  
A. Clark ◽  
D. Forgette ◽  
M. Devost ◽  
R. Okerson ◽  
...  
Keyword(s):  
Compression Ratio ◽  
Air Flow ◽  
Flow Analysis ◽  
Weight Ratio ◽  
System Level ◽  
Specific Power ◽  
Kinematic Modeling ◽  
Analysis And Design ◽  
Piston Speed ◽  
Piston Displacement

Current trends in engine design have pushed the state of the art regarding high power-to-weight ratio gasoline engines. Newly developed engine systems have a power-to-weight ratio near 1 hp per pound. The engine configuration presented herein makes it possible to package a large number of power producing pistons in a small volume, resulting in a power-to-weight ratio near 2 hp per pound, which has never before been realized in a production engine. The analysis and design of a lightweight two-stroke 6-sided in-plane polygon engine having a geometric compression ratio of 15.0, an actual compression ratio of 8.8, and a piston speed of 3500 ft/min are presented in this investigation. Typical results show that for a hexagonal engine with 2 in. diameter pistons and 1.25 in. stroke, a single piston displacement is 7.85 cubic in., while the total engine displacement is 47. 1 cubic in. Full power at 12,960 rpm at an air flow rate of 353 cubic feet per minute affords 0.444 cubic ft/min/hp for specific power. For an efficiency of 21%, the blower power is 168 hp. Our air-flow analysis shows that the power of the engine does not depend on the number of pistons, but rather on the volume of the gas-air mixture which passes through the engine. System level engineering of power output, kinematic modeling, air-flow modeling, efficiency, scavenging predictions, crankshaft sizing, and weight estimates are presented.

Iterative Study to Improve Air Flow Distribution on Ventilation Unit Duct Using CFD Analysis

2020 ◽  
Author(s):  
Paulson Parayil ◽  
Somnath Sen ◽  
Anit Sen ◽  
Arunkumar Goel
Keyword(s):  
Air Flow ◽  
Flow Distribution ◽  
Cfd Analysis

Indoor air flow analysis based on lattice Boltzmann methods

2002 ◽  
Vol 34 (9) ◽  
pp. 941-949 ◽  
Author(s):  
B Crouse ◽  
M Krafczyk ◽  
S Kühner ◽  
E Rank ◽  
C van Treeck
Keyword(s):  
Indoor Air ◽  
Lattice Boltzmann ◽  
Air Flow ◽  
Flow Analysis ◽  
Lattice Boltzmann Methods ◽  
Indoor Air Flow
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