This document presents information on fluid dynamics of under floor air distribution systems. It discusses how UFAD systems work by supplying conditioned air through floor outlets which takes advantage of thermal stratification with warm air rising towards the ceiling for exhaust. Key advantages of UFAD systems include improved ventilation, indoor air quality, reduced energy use, and reduced floor to floor heights in buildings. Common applications are in office buildings, data centers, and server rooms due to their large cooling loads.

1. “FLUID DYNAMICS OF UNDER FLOOR AIR
DISTRIBUTION SYSTEM”
PRESENTED BY:-
Gurpreet singh
Uid- k10966
course – B.tech
Branch –mechanical
Year/Sem- 3rd/6th
PRESENTEDTO:-
Mr. Aditya Mishra
Assistant professor
Mechanical Deptt.
CAREER POINT UNIVERSITY, KOTA
MAJOR ASSIGNMENT OF RAC

2. CONTENT
1. Introduction.
2. Principle
3. Description.
4. Advantages.
5. Conclusion
6. Reference.

3. INTRODUCTION
 The first UFD system
was introduced in 1950.
 It was used to cool a
computer room.but
currently it is used in
office buildings.

4. PRINCIPLE
 UFAD systems capitalize on the natural stratification that occurs when
warm air rises due to thermal buoyancy.
 conditioned air stays in the lower, occupied part of the room, while heat
sources such as occupants and equipment generate thermal plumes, which
carry the warm air and heat source generated pollutants towards
the ceiling where they are exhausted through the return air ducts

5. SYSTEM DESCRIPTION
1.UFAD sys . 2.overhead

6. DESCRIPTION
 With UFAD systems, conditioned air from the air
handling unit (AHU) is ducted into the underfloor plenum
where it typically flows freely to the supply outlets.
Underfloor systems are generally configured to have a
relatively large number of smaller supply outlets, many in
close proximity to the building occupants, as compared
to a conventional overhead system.

7. ADVANTAGES
 Improved ventilation efficiency and indoor air
quality.
 Reduced energy use.
 Reduced floor-to-floor height in new
construction.

8. APPLICATION
 Underfloor air distribution is frequently used in office buildings, particularly
highly-reconfigurable and open plan offices where raised floors are desirable
for cable management
 UFAD is also common in command centers, IT data centers and Server
rooms that have large cooling loads from electronic equipment and
requirements for routing power and data cables.

9. REFERENCE
 Baines,W. D. 1975 Entrainment by a plume or jet at a
density interface. J. Fluid Mech. 68, 309{320.Baines,W. D. &
Turner, J.S. 1969Turbulent buoyant convection in a source
in a conffined region. J. Fluid Mech. 37, 51.
 ASHRAE. 1993. Handbook of Fundamentals,American
Society of Heating, Refrigerating, and AirConditioning
Engineers, Inc., Atlanta.ASHRAE. 2001. ASHRAE Handbook
of Fundamentals,American Society of Heating,
Refrigerating, andAir Conditioning Engineers, Inc., Atlanta.

10. THANK YOU