ASHRAE Journal - October 2021 - 68

ASHRAE TECHNOLOGY AWARD CASE STUDIES
time, based on the latest cooling load and the weather
conditions. A key feature of the algorithm is that in
determining the optimal control settings, it can evaluate
all possible combinations of equipment and control
settings to ensure the minimum energy use of the chiller
plant at all times.
Once the optimal control settings are found, it is sent
back to the building management system (BMS) for
immediate implementation to continuously minimize
the energy consumption of the whole chiller plant.
ONLINE
STEAM SOLUTIONS
Comparison Between Dynamic (PGML-Model-Based)
And Traditional Optimization in Chiller Plants
The dynamic (PGML-model-based) optimization can
bring the following advantages:
* The equipment deterioration
is one of the factors considered for
dynamic optimization;
* All control variables are
taken into account for real-time
optimization (including the control
variables of chillers, cooling towers
and chilled water and condensing
pumps); and
* Data-driven optimization can
MANUFACTURED
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be adaptive to any sudden changes
(the real-time optimization can still
be performed if some chillers have
sudden faults or are under maintenance).
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68
ASHRAE JOURNAL ashrae.o rg O CTO B E R 2 0 2 1
Discover Unnoticed Faults
Unlike traditional fault detection
and diagnosis (FDD), our AFDD
focuses on the detection of the
unnoticed faults such as equipment
deterioration and control instability.
Figure 2 shows the detection of
hunting in an AHU control valve.
The magnitude of oscillation was
also evaluated to assess the severity
of its impact on the HVAC system.
2021
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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
ASHRAE Journal - October 2021 - 3
ASHRAE Journal - October 2021 - 4
ASHRAE Journal - October 2021 - 5
ASHRAE Journal - October 2021 - 6
ASHRAE Journal - October 2021 - 7
ASHRAE Journal - October 2021 - 8
ASHRAE Journal - October 2021 - 9
ASHRAE Journal - October 2021 - 10
ASHRAE Journal - October 2021 - 11
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ASHRAE Journal - October 2021 - 14
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ASHRAE Journal - October 2021 - 37
ASHRAE Journal - October 2021 - 38
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ASHRAE Journal - October 2021 - 67
ASHRAE Journal - October 2021 - 68
ASHRAE Journal - October 2021 - 69
ASHRAE Journal - October 2021 - 70
ASHRAE Journal - October 2021 - 71
ASHRAE Journal - October 2021 - 72
ASHRAE Journal - October 2021 - HR1
ASHRAE Journal - October 2021 - HR2
ASHRAE Journal - October 2021 - HR3
ASHRAE Journal - October 2021 - HR4
ASHRAE Journal - October 2021 - HR5
ASHRAE Journal - October 2021 - HR6
ASHRAE Journal - October 2021 - HR7
ASHRAE Journal - October 2021 - HR8
ASHRAE Journal - October 2021 - HR9
ASHRAE Journal - October 2021 - HR10
ASHRAE Journal - October 2021 - HR11
ASHRAE Journal - October 2021 - HR12
ASHRAE Journal - October 2021 - HR13
ASHRAE Journal - October 2021 - HR14
ASHRAE Journal - October 2021 - HR15
ASHRAE Journal - October 2021 - HR16
ASHRAE Journal - October 2021 - HR17
ASHRAE Journal - October 2021 - HR18
ASHRAE Journal - October 2021 - HR19
ASHRAE Journal - October 2021 - HR20
ASHRAE Journal - October 2021 - HR21
ASHRAE Journal - October 2021 - HR22
ASHRAE Journal - October 2021 - HR23
ASHRAE Journal - October 2021 - HR24
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ASHRAE Journal - October 2021 - 96
ASHRAE Journal - October 2021 - Cover3
ASHRAE Journal - October 2021 - Cover4
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