ASHRAE Journal Supplement - AMCA InMotion - October 2020 - 31

There is no formal deﬁnition of high-temperature fan.

Wheel failure. Wheel failure can be evidenced by not

Most industrial-fan manufacturers, however, consider a

only breakage, but distortion. One of the main contrib-

high-temperature fan to be a fan capable of withstanding

uting factors is thermal creep. Fan manufacturers account

operating air-stream temperatures 250°F (approximately

for thermal creep through proper selection of the mate-

120°C) and higher. Air-stream temperature is the tempera-

rials of construction of air-stream components (Table 1).

ture of air/gas inside of a fan; it is different from ambient

For temperatures greater than 1,550°F (843°C), many

temperature, or the temperature of the air surrounding

manufacturers use special casting alloys to reduce welding

the motor, bearings, and external accessories of a fan

and mitigate issues caused by thermal creep. Often, this

(Figure 1). It is important to understand how these two

increases both costs and lead time.
Though shrouded wheels with airfoil, backward-

temperatures impact the design of a fan.

curved, or backward-inclined blades are the most efﬁcient,

High-Temperature Air Streams,
Continuous Operation

they typically have a maximum-temperature capability of

A high-temperature fan can fail in a number of ways.

(Figure 2), propeller (Figure 3), or radial-blade (Figure 4)

900°F (482°C). For higher temperatures, forward-curved

Forward-curved wheel rated for use at
up to 2,000°F (1,093°C), based on
material used

High-temperature fan with
insulated plug panel aligned
with system insulation

Insulated
plug panel

System insulation
Hot air dissipating through system walls and
increasing temperature around non-air-stream
components (e.g., bearings, motors)

FIGURE 2. Forward-curved high-temperature fan.

High temperature inside system
impacts air-stream components of fan

FIGURE 1. Air-stream temperature vs. ambient
temperature.
Temperature/
Atmosphere
Up to 900°F
(482°C)
900°F to 1,550°F
(482°C to 843°C)

buh123/Bigstock

1,550°F to 2,000°F
(843°C to 1,093°C)
Corrosive and
high temperature

Material

Material Cost

Carbon steel

X

Stainless steel

3X

Cobalt-laden
alloys

141X

Nickel-chromium
alloys

46X

TABLE 1. Optimal material selection.
Source: Garden City Fan High Temperature Fan Engineering
Quality Standard EQS-12.0

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

Reversible
airflow
Insulated plug panel

FIGURE 3. High-temperature propeller fan
(2,000°F/1,093°C).

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

31

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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