ASHRAE Journal - February 2024 - 60
TECHNICAL FEATURE
FIGURE 8 Variation of pH values for test liquids kept in stagnation condition at
elevated environment without outside exposure.
10.9
10.7
10.5
10.3
10.1
9.9
9.7
9.5
pH vs Time (no parts)
Conclusion
Initial
PG-55
PG-25
Time
EG-25
Final
EG-55
conductivity value at the end of the experiment.
Online Figure 12 shows that for Set II, only EG-25 had a
4.5% increase in conductivity value. EG-55, PG-55 and
PG-25 had a decrease in conductivity level ranging from
1.5% to 2.7% from their initial values.
Online Figure 13 shows that Set I had a lower ORP value,
indicating reduced corrosive properties. The highest
decrease was in PG-25, and the least change was in
EG-25. In Online Figure 14, Set II with wetted materials
had reduced ORP values except for PG-55, which had
an increase. EG-25 had the highest reduction of 50 mV,
During accelerated degradation at the cold plate
level, test liquids showed decreased chemical
properties. PG-25 had the least change of 4.6% in pH,
2.8% in conductivity and EG-25 had the least change
in ORP. PG-25 had the least effect on metal surface
corrosiveness, thermal resistance and pressure drop.
In the second experiment, liquids showed advantages
in different areas. EG-55 had a 1.4% pH reduction in
the no-parts immersed case, while EG-25 had the least
reduction of 3.2% in the presence of wetted materials.
PG-25 had the least reduction in conductivity without
wetted materials, and EG-25 had a 2.7% reduction in
their presence. PG-55 had the least increase in ORP
value without wetted materials, and EG-25 had the least
increase in the immersed case.
Liquid characteristics significantly changed in jars
with no outside air exposure. PG-55 had a 0.39%
EG-55 had 7.6 mV less and PG-25 had a value like
the beginning.
New Standard 90.4-2022
Updates ELC Requirements and Adds
Renewable Energy and Recovered Energy Credits
Newly revised Standard 90.4 includes changes to account for
existing circumstances in building projects and improvements
in equipment effi ciency, as well as changes to incentivize
deployment of renewable energy and recovered energy while
still requiring the use of energy-effi cient mechanical and
electrical systems.
ashrae.org/90.4
60
ASHRAE JOURNAL ashrae.org F E B R U A RY 2 0 2 4
pH
http://www.ashrae.org/90.4
http://www.shortridge.com
http://www.ashrae.org
ASHRAE Journal - February 2024
Table of Contents for the Digital Edition of ASHRAE Journal - February 2024
ASHRAE Journal - February 2024 - Intro
ASHRAE Journal - February 2024 - CT1
ASHRAE Journal - February 2024 - CT2
ASHRAE Journal - February 2024 - Cover1
ASHRAE Journal - February 2024 - Cover2
ASHRAE Journal - February 2024 - 1
ASHRAE Journal - February 2024 - 2
ASHRAE Journal - February 2024 - 3
ASHRAE Journal - February 2024 - 4
ASHRAE Journal - February 2024 - 5
ASHRAE Journal - February 2024 - 6
ASHRAE Journal - February 2024 - 7
ASHRAE Journal - February 2024 - 8
ASHRAE Journal - February 2024 - 9
ASHRAE Journal - February 2024 - 10
ASHRAE Journal - February 2024 - 11
ASHRAE Journal - February 2024 - 12
ASHRAE Journal - February 2024 - 13
ASHRAE Journal - February 2024 - 14
ASHRAE Journal - February 2024 - 15
ASHRAE Journal - February 2024 - 16
ASHRAE Journal - February 2024 - 17
ASHRAE Journal - February 2024 - 18
ASHRAE Journal - February 2024 - 19
ASHRAE Journal - February 2024 - 20
ASHRAE Journal - February 2024 - 21
ASHRAE Journal - February 2024 - 22
ASHRAE Journal - February 2024 - 23
ASHRAE Journal - February 2024 - 24
ASHRAE Journal - February 2024 - 25
ASHRAE Journal - February 2024 - 26
ASHRAE Journal - February 2024 - 27
ASHRAE Journal - February 2024 - 28
ASHRAE Journal - February 2024 - 29
ASHRAE Journal - February 2024 - 30
ASHRAE Journal - February 2024 - 31
ASHRAE Journal - February 2024 - 32
ASHRAE Journal - February 2024 - 33
ASHRAE Journal - February 2024 - 34
ASHRAE Journal - February 2024 - 35
ASHRAE Journal - February 2024 - 36
ASHRAE Journal - February 2024 - 37
ASHRAE Journal - February 2024 - 38
ASHRAE Journal - February 2024 - 39
ASHRAE Journal - February 2024 - 40
ASHRAE Journal - February 2024 - 41
ASHRAE Journal - February 2024 - 42
ASHRAE Journal - February 2024 - 43
ASHRAE Journal - February 2024 - 44
ASHRAE Journal - February 2024 - 45
ASHRAE Journal - February 2024 - 46
ASHRAE Journal - February 2024 - 47
ASHRAE Journal - February 2024 - 48
ASHRAE Journal - February 2024 - 49
ASHRAE Journal - February 2024 - 50
ASHRAE Journal - February 2024 - 51
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ASHRAE Journal - February 2024 - 53
ASHRAE Journal - February 2024 - 54
ASHRAE Journal - February 2024 - 55
ASHRAE Journal - February 2024 - 56
ASHRAE Journal - February 2024 - 57
ASHRAE Journal - February 2024 - 58
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ASHRAE Journal - February 2024 - 60
ASHRAE Journal - February 2024 - 61
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ASHRAE Journal - February 2024 - 63
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ASHRAE Journal - February 2024 - 68
ASHRAE Journal - February 2024 - 69
ASHRAE Journal - February 2024 - 70
ASHRAE Journal - February 2024 - 71
ASHRAE Journal - February 2024 - 72
ASHRAE Journal - February 2024 - Cover3
ASHRAE Journal - February 2024 - Cover4
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