ASHRAE Journal - October 2021 - 63

COLUMN ENGINEER'S NOTEBOOK
FIGURE 6 Plotting Real Data Against the Lines of Perfection. The blue cloud represents a year of hourly tonnage data. The column text discusses the details of the issues highlighted.
A. The lines of perfection.
B. The cloud with opportunity areas highlighted in red, green and yellow.
C. Yellow dots vs. red dots vs. orange line slope reveal economizer issue.
D. Yellow dots vs. red dots vs. orange line slope reveal a potential underventilation
issue.
E. Purple dots and green dots vs. the lines of perfection reveal a potential
economizer high limit issue.
A.
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
B.
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
Tons vs. OAT - All Cooling Sources
Load if All
Systems Were
100% OA
Load if All
Systems Were
Economizer-Equipped
With 20% MOA
C.
Economizer High Limit Setting
99.6% Atlanta
Design Heating
Condition
Design Cooling Coil LAT
0 10 20 30 40 50 60 70 80 90 100 110 120
Outdoor Temperature (°F)
D.
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
Tons vs. OAT - All Cooling Sources
Load if All
Systems Were
100% OA
Load if All
Systems Were
Economizer-Equipped
With 0% MOA
E.
99.6% Atlanta
Design Heating
Condition
Design Cooling Coil LAT
0 10 20 30 40 50 60 70 80 90 100 110 120
Outdoor Temperature (°F)
both areas.
Dots Have Value
The dots represent ton hours. By fi ltering the
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
Tons vs. OAT - All Cooling Sources
Load if All
Systems Were
100% OA
Load if All
Systems Were
Economizer-Equipped
With 20% MOA
Economizer High Limit Setting
99.6% Atlanta
Design Heating
Condition
Design Cooling Coil LAT
0 10 20 30 40 50 60 70 80 90 100 110 120
Outdoor Temperature (°F)
Tons vs. OAT - All Cooling Sources
Load if All
Systems Were
100% OA
Load if All
Systems Were
Economizer-Equipped
With 20% MOA
99.6% Atlanta
Design Heating
Condition
Economizer High Limit Setting
Design Cooling Coil LAT
0 10 20 30 40 50 60 70 80 90 100 110 120
Outdoor Temperature (°F)
Tons vs. OAT - All Cooling Sources
Load if All
Systems Were
100% OA
Load if All
Systems Were
Economizer-Equipped
With 20% MOA
99.6% Atlanta
Design Heating
Condition
Design Cooling Coil LAT
0 10 20 30 40 50 60 70 80 90 100 110 120
Outdoor Temperature (°F)
spreadsheet, we can add them up. Figure 7 illustrates
what is revealed by doing that for the ton hours inside
the red outline in Figure 6b.
While broad by design, the projected savings are eye
O CTO B E R 2 0 2 1 ashrae.o rg ASHRAE JOURNAL
63
Tons
Tons
Tons
Tons
Tons
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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