ASHRAE Journal - October 2021 - 67

HONORABLE MENTION | 2021 ASHRAE TECHNOLOGY AWARD CASE STUDIES
ASHRAE Standard 90.1-2019 have been fully considered
in the dynamic optimization search.
Automated Fault Detection and Diagnosis (AFDD)
The second approach is to develop the model-based
algorithm for automated fault detection and diagnosis
of faults in different types of equipment (including airhandling
units, VAV boxes, chillers, pumps and cooling
towers) as well as sensors. The developed model is
considered as the baseline model to compare the future
model for performance deterioration detection. Once
the new set of operating data is available, the current
PGML model will be updated accordingly to detect any
signifi cant change in equipment performance. With
AFDD, the energy that is wasted due to the presence
of unnoticed system or equipment faults can be minimized.
An immediate action can be performed when the
signifi cant change in equipment performance
is detected.
Energy Effi ciency Improvement and Energy Savings
After one-year implementation,
the yearly energy saving of 7.2% was
achieved, and the overall plant COP
was improved from 3.58 to 3.86. The
actual energy savings are calculated in
accordance with ASHRAE Guideline
14-2014, Measurement of Energy, Demand,
and Water Savings.
Innovation
Issue
Impact
Severity
Implications
Recommendations
Diagnostic Result
The key innovation of this platform is
to successfully develop a new approach
to perform a real-time dynamic optimization
for a whole chiller plant
under practical constraints (such as
data quality issues and operational constraints).
100
80
60
40
20
Using Actual Operating Data to Develop PGML Models
For Dynamic Optimization
Dynamic optimization is built upon the basis of selftrained
physics-guided machine learning (PGML) models
using actual operating data. This hybrid blend of
physics principles and machine learning (ML) approach
ensures accurate modeling of the actual performance of
chiller plant equipment, including chillers, pumps and
cooling towers, as refl ected by the operating records.
FIGURE 1 PGML chiller model.
°C
14
12
10
8
6
4
2
12
13
14
15
16
17
18
19
20
21
22
0.2
0.4
Chiller PLR
FIGURE 2 (Top) AFDD shows details from discovering system faults, stating root causes, evaluating severity
and giving recommendations. (Bottom) AHU valve position.
Supply Air Temperature Oscillation
Cooling Coil Valve Oscillation
Control
CRITICAL
Unstable Supply Air Temperature Control
Unstable Cooling Coil Valve Control
Review PI Setting on Supply Air Temperature Control
Review PI Setting on Cooling Coil Valve Control
Supply Air Temperature was Oscillating with the Magnitude of ±12°C
Cooling Coil Valve was Oscillating with the Magnitude of ±33.1%
0.6
0.8
1.0
AHU_14F_1 ChW, Valve Setpoint
12a
4a
8a
12p
4p
8p
12a
Figure 1 shows the PGML chiller model to represent the
actual performance of chiller. The PGML chiller model
can provide an accurate performance prediction under
different operating conditions. If there is no physical
principle guiding the machine learning in developing
chiller models, the predictability will be limited or even
invalid outside the range of available data.
Self-Developed Algorithm for Real-Time Dynamic Optimization
Dynamic optimization adopts an algorithm developed
in-house to determine the optimal control setting in real
O CTO B E R 2 0 2 1
ashrae.o rg
a s h r a e . o r g
ASHRAE JOURNAL
A S H
A E J O U R N A L
67
Valve Position (% Open)
Chiller COP
http://ashrae.org

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
ASHRAE Journal - October 2021 - 12
ASHRAE Journal - October 2021 - 13
ASHRAE Journal - October 2021 - 14
ASHRAE Journal - October 2021 - 15
ASHRAE Journal - October 2021 - 16
ASHRAE Journal - October 2021 - 17
ASHRAE Journal - October 2021 - 18
ASHRAE Journal - October 2021 - 19
ASHRAE Journal - October 2021 - 20
ASHRAE Journal - October 2021 - 21
ASHRAE Journal - October 2021 - 22
ASHRAE Journal - October 2021 - 23
ASHRAE Journal - October 2021 - 24
ASHRAE Journal - October 2021 - 25
ASHRAE Journal - October 2021 - 26
ASHRAE Journal - October 2021 - 27
ASHRAE Journal - October 2021 - 28
ASHRAE Journal - October 2021 - 29
ASHRAE Journal - October 2021 - 30
ASHRAE Journal - October 2021 - 31
ASHRAE Journal - October 2021 - 32
ASHRAE Journal - October 2021 - 33
ASHRAE Journal - October 2021 - 34
ASHRAE Journal - October 2021 - 35
ASHRAE Journal - October 2021 - 36
ASHRAE Journal - October 2021 - 37
ASHRAE Journal - October 2021 - 38
ASHRAE Journal - October 2021 - 39
ASHRAE Journal - October 2021 - 40
ASHRAE Journal - October 2021 - 41
ASHRAE Journal - October 2021 - 42
ASHRAE Journal - October 2021 - 43
ASHRAE Journal - October 2021 - 44
ASHRAE Journal - October 2021 - 45
ASHRAE Journal - October 2021 - 46
ASHRAE Journal - October 2021 - 47
ASHRAE Journal - October 2021 - 48
ASHRAE Journal - October 2021 - 49
ASHRAE Journal - October 2021 - 50
ASHRAE Journal - October 2021 - 51
ASHRAE Journal - October 2021 - 52
ASHRAE Journal - October 2021 - 53
ASHRAE Journal - October 2021 - 54
ASHRAE Journal - October 2021 - 55
ASHRAE Journal - October 2021 - 56
ASHRAE Journal - October 2021 - 57
ASHRAE Journal - October 2021 - 58
ASHRAE Journal - October 2021 - 59
ASHRAE Journal - October 2021 - 60
ASHRAE Journal - October 2021 - 61
ASHRAE Journal - October 2021 - 62
ASHRAE Journal - October 2021 - 63
ASHRAE Journal - October 2021 - 64
ASHRAE Journal - October 2021 - 65
ASHRAE Journal - October 2021 - 66
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
ASHRAE Journal - October 2021 - 73
ASHRAE Journal - October 2021 - 74
ASHRAE Journal - October 2021 - 75
ASHRAE Journal - October 2021 - 76
ASHRAE Journal - October 2021 - 77
ASHRAE Journal - October 2021 - 78
ASHRAE Journal - October 2021 - 79
ASHRAE Journal - October 2021 - 80
ASHRAE Journal - October 2021 - 81
ASHRAE Journal - October 2021 - 82
ASHRAE Journal - October 2021 - 83
ASHRAE Journal - October 2021 - 84
ASHRAE Journal - October 2021 - 85
ASHRAE Journal - October 2021 - 86
ASHRAE Journal - October 2021 - 87
ASHRAE Journal - October 2021 - 88
ASHRAE Journal - October 2021 - 89
ASHRAE Journal - October 2021 - 90
ASHRAE Journal - October 2021 - 91
ASHRAE Journal - October 2021 - 92
ASHRAE Journal - October 2021 - 93
ASHRAE Journal - October 2021 - 94
ASHRAE Journal - October 2021 - 95
ASHRAE Journal - October 2021 - 96
ASHRAE Journal - October 2021 - Cover3
ASHRAE Journal - October 2021 - Cover4
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