ASHRAE Journal - April 2021 - 18
SOLVING PROBLEMS
Column
Exploring Challenges
In Existing Building
Automation Systems
INTERVIEWS BY MARY KATE MCGOWAN, MANAGING EDITOR
Often, engineers design with a focus on the " peaks and valleys " when working on
building automation systems (BAS), said James Del Monaco, P.E., Member ASHRAE,
chair of ASHRAE Technical Committee 1.4, Control Theory and Application. But,
he says, " to properly design the system, we need to also understand all the points
in-between. "
From designing BAS to work properly from the start or troubleshooting issues after
construction, engineers need to know common system challenges and misapplications when working with existing BAS. Del Monaco and other engineers dive into
accessible tips to diagnose problems efficiently and provide recommendations and
best practices for assessment tools and techniques.
Most Common Issues
Right Component, Right Place
" Make sure you've got the right component for
the job and that it's put in the right place, " said
Chris Benson, P.E., Member ASHRAE, member of
TC 1.4. For instance, Benson, an associate director of sustainability and energy at the University of
Utah, said building pressure sensors are often poorly
located, which can result in issues with stability and
personal comfort. If you see leaves blowing in or that
people by exterior doors can't stay warm, pressure
sensor location could be an issue.
" Make sure manufacturer recommendations for
height and recommended distance from walls and
18
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APRI L 2021
doors are understood and followed. For big buildings,
consider use of multiple sensors, including [one on] the
lowest floor with an entrance (where pressure is most
negative), " he said.
Another issue is also tied to location. Hydronic flow
sensors, like those used in energy meters, are too often
placed where inadequate lengths of straight pipe exist,
which reduces accuracy-sometimes significantly, said
Benson. " If we can't get reasonably accurate measurements, it may not be worth the investment to have the
equipment in the first place. Find a better location,
alternate technology choice or supplement with flow
straighteners to ensure manufacturer recommendations are met, " he said.
http://www.ashrae.org
ASHRAE Journal - April 2021
Table of Contents for the Digital Edition of ASHRAE Journal - April 2021
Contents
ASHRAE Journal - April 2021 - Intro
ASHRAE Journal - April 2021 - Cover1
ASHRAE Journal - April 2021 - Cover2
ASHRAE Journal - April 2021 - 1
ASHRAE Journal - April 2021 - Contents
ASHRAE Journal - April 2021 - 3
ASHRAE Journal - April 2021 - 4
ASHRAE Journal - April 2021 - 5
ASHRAE Journal - April 2021 - 6
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ASHRAE Journal - April 2021 - 18
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ASHRAE Journal - April 2021 - Cover3
ASHRAE Journal - April 2021 - Cover4
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