ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 8

Average fan zone speed (m/s)
Transient average particle concentration
at the whole-warehouse breathing zone
1
2
3
4
5
6
7
FS-0
FS-1.2
FS-2.1
FS-3
FS-0.6
FS-1.5
FS-2.4
FS-0.9
FS-1.8
FS-2.7
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
10
12
14
16
18
20
100
200
300
Time, min
(a)
FIGURE 5. (a) Transient breathing-zone concentration,
(b) eighth-hour breathing-zone and working-zone
concentrations and relative concentration reduction
(baseline: FS-0), and (c) the cylindrical shape of the
" fan zone " (radius: 2.5 × 3.05 m = 7.6 m [25 ft]) for the
fan-velocity analysis of U-H-D-3.
researchers conducted simulations of the fan speeds 0.9 m/s
(3.0 fps) (30-percent fan speed), 1.2 m/s (~4.0 fps) (40-percent
fan speed), 1.5 m/s (5.0 fps) (50-percent fan speed), 1.8 m/s
(6.0 fps) (60-percent fan speed), 2.1 m/s (7.0 fps) (70-percent
fan speed), 2.4 m/s (8.0 fps) (80-percent fan speed), and
2.7 m/s (9.0 fps) (90-percent fan speed) (Figure 5). This
modeling was limited to the U-H-D-3 arrangement.
Table 2 summarizes airflow characteristics of the
modeled fans for a variety of speeds with the U-H-D-3
arrangement.
Guidance
Based on the preceding conclusions, the guidance in Table 3,
which combines particle-concentration considerations
with thermal-comfort constraints, was developed. It is
intended primarily for building operators and other
individuals with control over the operation of fans in
large, sparsely occupied spaces.
8
2021 AMCA inmot ion
400
500
2
4
6
8
(b)
2.5 × fan radius
BZ_concentration
WZ_concentration
BZ_reduction
WZ_reduction
-30%
-20%
-10%
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
Fan air speed (m/s)
1.7 m
(5.6 ft)
(c)
Summary
Building operators and other individuals with control
over the operation of fans in large, sparsely occupied
spaces are encouraged, where feasible, to operate fans
with doors and/or windows open, as they will increase
ventilation airfl ow through the openings. Additionally,
they are advised to avoid locating occupants immediately
downstream of each other for extended periods
and to operate fans at the highest feasible speed while
maintaining occupant comfort. The simulations showed
a notable reduction in concentration at high fan speeds
(e.g., summer conditions) and only a slight reduction in
concentration close to the fan (e.g., within two fan diameters),
with no practical difference outside of that region,
at low fan speeds.
www.amca.org
#/m3
Concentration (#/m3
)
Percentage of Concentration Reduction
http://www.amca.org

ASHRAE Journal Supplement - AMCA InMotion - November 2021

Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - November 2021

Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - BB1
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - BB2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 3
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 4
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 5
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 6
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 7
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 8
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 9
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 10
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 11
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 12
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 13
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 14
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 15
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 16
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 17
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 18
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 19
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 20
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 21
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 22
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 23
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 24
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 25
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 26
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 27
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 28
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 29
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 30
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 31
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 32
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 33
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 34
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 35
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 36
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 37
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 38
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 39
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 40
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 41
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 42
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 43
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 44
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover4
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