Numerical Simulation for Under-Floor Air Distribution System With Swirl Diffusers

[+] Author and Article Information
Xiuling Wang

Nevada Center for Advanced Computational Methods, University of Nevada Las Vegas, Las Vegas, NV 89154-4027

Darrell W. Pepper1

Nevada Center for Advanced Computational Methods, University of Nevada Las Vegas, Las Vegas, NV 89154-4027dwpepper@nscee.edu


Corresponding author.

J. Heat Transfer 129(4), 589-594 (Dec 06, 2006) (6 pages) doi:10.1115/1.2709974 History: Received July 31, 2006; Revised December 06, 2006

A finite volume renormalization group (RNG) k-ε turbulent model was employed to simulate an under-floor air distribution (UFAD) system consisting of eight swirl diffusers. Mesh generation was conducted using PRO/E and GAMBIT . Computational fluid dynamics (CFD) results using FLUENT show both flow and thermal patterns for an instrumented laboratory room (Building Technology Laboratory-BTL) located at the University of Nevada Las Vegas. Simulation results are presented using symmetrical boundary settings for the BTL. Stratification heights and clear zones are discussed. The application of CFD simulation provides insightful analyses in UFAD design and placement.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Side-section view of the BTL (from Ref. 15)

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Figure 2

3D geometry for swirl diffuser: (a) exploded view, (b) assembled view, and (c) computational domain

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Figure 3

Layout for testing space in BTL with eight swirl diffusers

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Figure 4

Mesh for BTL with four swirl diffusers

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Figure 5

Mesh for BTL around swirl diffusers

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Figure 6

Variation of average surface temperature versus height

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Figure 7

Temperature and velocity distribution at Z=5ft(1.52m)

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Figure 8

Test grids in the BTL

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Figure 9

Velocity magnitude at three test planes

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Figure 10

Temperature at three test planes



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