ASHRAE Journal - March 2021 - 48

COLUMN ENGINEER'S NOTEBOOK

Condenser
Evaporator

develop the same chilled water pipe
FIGURE 4 Alternative recommended central plant makeup water system solution.
air entrainment issues.
The long-term solution selected
by the owner for implementation was to provide a separate
dedicated industrial makeup
water line for the cooling towers,
so extreme cooling tower makeup
water demands will not influence the makeup water pressure
on the campus CHW line. Figure
CT Makeup
ICW
PRV
Water Solenoid
3 (page 47) shows a sketch of this
CHW Makeup
ET
Water Solenoid or
ICW
PRV
arrangement. This solution has the
Control Valve
Pressure Center
P
Campus
advantage of robust, immediate
CHWS
system refill response to losses of
Campus
CHWR
water volume in the system, but
Alternative Recommended Central Plant Makeup Water System
3
also comes with the potential issue
of " feeding the flood " if there is a
significant leak in the system.
An alternative solution the author recommends
automate leak detection, as described in a previous
designers consider is to use a pressure sensor to
expansion tank column by Steve Taylor.1 This design
approach enables automated fault detection of system leaks through the pressure sensor. To build on the
expansion tank piping scheme presented by Taylor,1 the
ASHRAE eLearning
The Complete HVAC&R Learning Experience
author recommends designers consider adding a solenoid or full-port control valve in series with the pressure
No Travel Required * Learn When Convenient
reducing valve to automate system refill response, while
Access When Needed * Track Performance
maintaining the ability to limit the rate of system refill
to avoid " feeding the flood " when a significant leak event
CORPORATE PROGRAMS AVAILABLE
occurs (Figure 4).
Condenser
Evaporator
Condenser
Evaporator

Conclusion
This case study illustrates that properly setting and
maintaining a campus' chilled water system pressure is
essential to keep critical campus operations functioning.
Reliable operating pressure, in turn, depends on having
independent piping connections that are not vulnerable
to extraordinary demands from other interconnected
sources. The author recommends that campus central
plant designers consider decoupling makeup water
lines for cooling tower condenser makeup water from
the chilled water system makeup lines to
achieve more reliable operation.
For the complete course catalog visit
ashrae.org/elearning
or contact elearning@ashrae.org

48

ASHRAE JOURNAL

ashrae.org

MARCH 2021

References
1. Taylor, S. 2016. " The fundamentals of
expansion tanks. " ASHRAE Journal 58(11).

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ASHRAE Journal - March 2021

Table of Contents for the Digital Edition of ASHRAE Journal - March 2021

Contents
ASHRAE Journal - March 2021 - Intro
ASHRAE Journal - March 2021 - Cover1
ASHRAE Journal - March 2021 - Cover2
ASHRAE Journal - March 2021 - 1
ASHRAE Journal - March 2021 - Contents
ASHRAE Journal - March 2021 - 3
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ASHRAE Journal - March 2021 - Cover3
ASHRAE Journal - March 2021 - Cover4
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