ASHRAE Journal - December 2019 - 124
COLUMN HVAC APPLICATIONS
double-inlet impeller with narrower flow passages
and fewer operating stresses may be a better fit.
6. Operating-speed ranges, if the fan is to be variable-speed.
Every structure has an infinite number of natural
frequencies that, if excited, can lead to a resonance condition and cause severe damage to the
fan and surrounding equipment. Fans can be
designed so no harmful natural frequencies are
within defined operating-speed ranges.
7. The items to be supplied by the fan manufacturer.
Typically, flow-control dampers are in the manufacturer's scope, as they directly impact fan performance. What about ancillary items, such as inlet
and outlet transitions and silencers? How will the
fan be driven-electric motor or turbine-and who
will provide the driver?
8. Details of the application. What is the dust load and
particle size at the fan inlet?
9. The likelihood of naturally occurring outside excitation,
such as earthquakes. If the probability is high, manufacturers will consider the possible deformation
124
ASHRAE JOURNAL
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D E C E M B E R 2 0 19
of the fan and structure to ensure there is no
undesirable mechanical contact or failure during a
seismic event.
Performance Requirements
Of course, the purchaser must specify the required fan
operating points. Usually, at least one load point is welldefined, including the required flow, pressure, operating temperature and gas density.
If the gas is a mixture, component quantities or the
overall specific gravity must be specified to enable the
manufacturer to calculate the inlet density and specific
heat ratio of the gas stream.
Density is such an important consideration because
most processes are designed on a mass-flow basis. Fans,
on the other hand, are volumetric devices, providing the
same volumetric flow rate against a constant (densitycorrected) pressure. For example, a cooling-system fan
that provides 10,000 cfm (4719 L/s) at sea level, where
the density is 0.075 lb/ft3 (1.2 kg/m3), also will provide
10,000 cfm (4719 L/s) at a higher elevation, such as in
http://www.dwyer-inst.com/index_sp.cfm
https://www.ashrae.org/
ASHRAE Journal - December 2019
Table of Contents for the Digital Edition of ASHRAE Journal - December 2019
Contents
ASHRAE Journal - December 2019 - Intro
ASHRAE Journal - December 2019 - CT1
ASHRAE Journal - December 2019 - CT2
ASHRAE Journal - December 2019 - Cover1
ASHRAE Journal - December 2019 - Cover2
ASHRAE Journal - December 2019 - 1
ASHRAE Journal - December 2019 - Contents
ASHRAE Journal - December 2019 - 3
ASHRAE Journal - December 2019 - 4
ASHRAE Journal - December 2019 - 5
ASHRAE Journal - December 2019 - 6
ASHRAE Journal - December 2019 - 7
ASHRAE Journal - December 2019 - 8
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ASHRAE Journal - December 2019 - Cover3
ASHRAE Journal - December 2019 - Cover4
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