ASHRAE Journal - March 2022 - 79
COLUMN ENGINEER'S NOTEBOOK
requires a much narrower pH range than for systems
with only steel and copper materials.
Obtaining Local Makeup
Water Quality Data
Many location-specifi c variables must be considered
when designing an HVAC system. However, the
most important variable pertaining
to this column is local makeup
water quality. Water quality varies
tremendously throughout North
America and the world, and failure
to consider the specifi c water quality
supplied to the intended HVAC
system will result in premature
failure, or missed opportunities to
reduce water, energy, and chemical
consumption.
Local water analyses can be
obtained by directly sampling the
water from a nearby or existing
building and sending to a laboratory
for a full analysis of total dissolved
solids (TDS) and total suspended solids
(TSS)‡‡/particulate. Many utilities
also provide detailed analyses; however,
they often omit one or more
critical parameters, e.g., alkalinity.
Bypass Feeders
We always recommend a bypass
feeder in closed water systems.
They have two purposes. They can
add chemicals to the closed water
system, typically on a one-year test
and adjust cycle, and the modern
units include a fi lter. Even though
they only fl ow 5 gpm (0.3 L/s) or
even less, eventually a good fi lter
‡‡Total suspended solids: TSS is a
measure of the particles (by weight) that
can be fi ltered by a non-reverse osmosis
fi lter. Water is poured through a fi lter, and
then deionized water is poured through to
remove TDS that would be left behind in
water on the fi lter. The fi lter is then dried
and the before and after weights are compared.
The intent is to not include TDS in
the measurement.
®
will clean the system of particles that are too small to be
caught by strainers. One of the authors did a prepurchase
survey of a condominium, and the facility manager
said he was replacing control valves frequently due
to erosion because of material left in the system.
The authors suggested adding a fi lter-feeder (Figure 2)
with a 20 micron fi lter. The facility manager said he had
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ASHRAE Journal - March 2022
Table of Contents for the Digital Edition of ASHRAE Journal - March 2022
ASHRAE Journal - March 2022 - Intro
ASHRAE Journal - March 2022 - Cover1
ASHRAE Journal - March 2022 - Cover2
ASHRAE Journal - March 2022 - 1
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ASHRAE Journal - March 2022 - Cover3
ASHRAE Journal - March 2022 - Cover4
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