ASHRAE Journal - October 2021 - 66

Leveraging Big Data
To Save Energy
BY DAVE CHAN, MEMBER ASHRAE; KENNETH LEE, MEMBER ASHRAE; PAN LEE, PH.D., ASSOCIATE MEMBER ASHRAE; FRANCO MOK, MEMBER ASHRAE
Ensuring building services systems run at the highest possible energy effi -
ciency is crucial to realize global greenhouse gas (GHG) emission reduction
targets. An all-in-one smart building energy management platform leverages
big data analytics and machine learning to achieve the best possible energy
performance of the central AC system for a Grade-A offi ce building in Hong
Kong. It transforms maintenance practices from experienced-based to datadriven
decision making.
Energy Effi ciency
This smart energy platform has been adopted
at 28Hennessy Road(28HR) since Dec. 1, 2018.
The key innovations are based on two approaches:
dynamic optimization and automated fault detection
and diagnostics (AFDD).
Dynamic Optimization
The fi rst approach is to develop the self-trained
physics-guided machine learning (PGML) models
using actual operating data. With the holistic PGML
model, the overall plant energy use corresponding
to various possible combinations of the control
settings, including the combination of chillers,
cooling towers and water pumps to be deployed,
the chilled water supply temperature setpoint, the
pump motor speed setpoint and the cooling tower
fan speed setpoint, can be evaluated to identify the
optimal control settings in real time. This approach
not only achieves energy savings, but also ensures
the minimum energy use in the central chiller
plant under various cooling load and weather
conditions.
Besides, practical constraints such as data quality
issues and operational constraints are also considered
in this optimization method. The energy
saving approaches proposed for chiller plants in
Dave Chan is chief executive of information, communications and building technologies, Kenneth Lee is technical manager, Pan Lee, Ph.D., is assistant technical
manager, and Franco Mok is energy service manager at ATAL, Hong Kong, China.
66
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2021 ASHRAE Technology Awards | Honorable Mention
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ASHRAE Journal - October 2021

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

Contents
ASHRAE Journal - October 2021 - Intro
ASHRAE Journal - October 2021 - Cover1
ASHRAE Journal - October 2021 - Cover2
ASHRAE Journal - October 2021 - 1
ASHRAE Journal - October 2021 - Contents
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ASHRAE Journal - October 2021 - HR1
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ASHRAE Journal - October 2021 - Cover3
ASHRAE Journal - October 2021 - Cover4
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