Numerical simulation of thermal stratification and air quality in an underfloor air distribution system (UFAD)

College

Gokongwei College of Engineering

Department/Unit

Mechanical Engineering

Document Type

Conference Proceeding

Source Title

IOP Conference Series: Earth and Environmental Science

Volume

463

Issue

1

Publication Date

4-6-2020

Abstract

The penetration of underfloor air distribution systems (UFAD) in residential and commercial air conditioning has been rather slow. The most notable applications would be on data centers, where thermal stratification requirements are more demanding. The present study supports and strengthens recent work in the design and development of UFAD systems, by augmenting literature on proper vent positioning and design. In UFAD systems where thermal stratification is more pronounced, significant energy savings may be achieved through proper positioning of supply and return vents. Using a validated numerical simulation model in ANSYS CFX, four UFAD vent layouts are investigated with regards to their implications on thermal stratification and indoor air quality. Results show that not only ventilation layout, but also vent type selection can significantly affect the performance of a UFAD system. Spreading multiple, smaller supply diffusers is preferable than having large supply diffusers on the perimeter of the rooms, both from a temperature distribution and indoor air quality perspective. Notably, air flow is significantly poor in the perimeter layout, causing warmer temperature at the center of the room. © 2020 Institute of Physics Publishing. All rights reserved.

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Digitial Object Identifier (DOI)

10.1088/1755-1315/463/1/012021

Disciplines

Mechanical Engineering

Keywords

Indoor air quality; Indoor air pollution; Ventilation

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