ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 36

Nitrogen input

Seal-body material
can change
e based
on temperature
ature

When using a gasket on a high-temperature fan, ensure
the gasket is rated for the air-stream temperature. This
is especially important when replacing gaskets during

Carbon/graphite
rings for up to
1,600°F
(870°C)

fan maintenance.
Motors and VFDs. In many cases, there is a powersaving advantage to using a variable-frequency drive (VFD)
on a high-temperature fan. Consider, for example, a requirement to move 33,000 cfm (15.57 m3/s) of air with 10.2 in. w.c.
(2,538 Pa) of static pressure at an air-stream temperature of

FIGURE 12. Multiring shaft seal with
nitrogen purge.

450°F (232°C), which corresponds to an operating density
of 0.044 lb/ft3 (0.705 kg/m3). At this operating condition

Source: Flowserve Corp.

and density, a 40.2-in.- (1,021 mm) diameter centrif-

Flow vs. static pressure at rated speed
and 450°F/232°C
Duty point at rated speed and 450°F/232°C
Flow vs. power at rated speed and 70°F/20°C

ugal fan operating at 1,770

System curve
Flow vs. power at rated speed
and 450°F/232°C
Motor rating

RPM would absorb 67 hp (50
kW) of power and require a
140

30

75-hp (55 kW) motor if used

130
Absorbed power of fan
at 0.075 lb/ft (1.2 kg/m 3)
and 1,770 RPM/60 Hz

20

Absorbed power of fan at 0.044 lb/ft
(0.705 kg/m 3) and 1,770 RPM/60 Hz

with a VFD. The fan would

110

start at approximately 30 Hz

100
90

3

80
70

15

60
50

10

40
30
5

0

10,000

20,000

30,000

40,000

50,000

when the system is at ambient
temperature (70°F/20°C) and
slowly speed up as the system
temperature increased. At
the rated operating temperature, the fan speed would be
the rated speed of 1,770 RPM

20
10
0
60,000

0

(Figure 13). If a VFD were not
used, the power needed to

Volumetric flow rate (cfm)

start the fan when the system

Flow vs. power at rated speed and 450°F/232°C
Flow vs. power at rated speed and 70°F/20°C
Flow vs. power at 885 RPM (30 Hz) and 70°F/20°C
140
1.2
130

is at ambient temperature

120

1.0

0.8

100
90
80
70

0.6

60

Absorbed power of fan at 0.044 lb/ft 3
(0.705 kg/m 3) at 1,770 RPM/60 Hz

0.4

Absorbed power of fan at 0.075 lb/ft 3
(1.2 kg/m 3) at 885 RPM/30 Hz

0.2

0
0

10,000

20,000

30,000

40,000

50

When using a VFD,
increase fan speed as
system temperature
increases; the absorbed
power will be less than
75 hp, meaning a 75-hp
motor can be used

50,000

FIGURE 13. Impact of VFDs on motor selection for high-temperature fans.

2020 A M CA i n m o t i o n

30
20
10

0
60,000

Volumetric flow rate (cfm)

36

40

would be 114 hp (85 kW),
and a 125-hp (93 kW) motor
would be required. Apart

110

Absorbed power of fan
at 0.075 lb/ft (1.2 kg/m 3)
at 1,770 RPM/60 Hz

Absorbed power (hp)

Static pressure (in. w.g.)

120

Absorbed power (hp)

Static pressure (in. w.g.)

25

f rom t he motor cost, t he
owner would need to invest
in panels/cables rated for
125 hp, as opposed to 75 hp.
In many cases, this would
be more expensive than a
VFD. That being the case, it
always is beneficial to do a
cost-benefit analysis when
investing in a high-temperature fan.

w w w. a m c a .o r g


http://www.amca.org

ASHRAE Journal Supplement - AMCA InMotion - October 2020

Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - October 2020

Contents
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - BB1
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - BB2
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - Contents
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 2
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 3
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 4
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 5
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 6
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 7
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 8
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 9
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 10
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 11
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 12
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 13
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 14
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 15
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 16
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 17
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 18
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 19
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 20
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 21
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 22
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 23
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 24
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 25
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 26
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 27
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 28
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 29
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 30
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 31
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 32
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 33
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 34
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 35
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 36
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 37
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 38
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 39
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 40
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 41
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 42
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 43
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 44
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - October 2020 - Cover4
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