ASHRAE Journal - July 2021 - 40

TECHNICAL FEATURE
FIGURE 2 After modifications completed (simplified).
In: 60°F+
From Cooling Towers
In: 56°F
CHWR from FAB
Existing
Condensers
Existing
Evaporator
New
Re-Pipe OFA
Compressor from
CHWS to CHWR
CHWR from FAB
Booster
Pump
Out: 39°F to 43.6°F
CHWS to FAB
56°F, 507 gpm to
713 gpm
CHWS
Out: 64.8°F to 87.4°F
To Cooling Towers
CHW = Chilled Water
CW = Condenser Water
ICW = Industrial City Water
OFA = Oil Free Air
RO = Reverse Osmosis
Green Highlight = New Items
OFA Compressor
75°F
New OFA
Aftercooler
55°F
OFA to FAB
(Typical 2)
VSD
Primary
Pump
CHWR from FAB
CWS
56°F
In: 60°F+
From Cooling Towers
2,300 gpm per Chiller
Heat Pump
Condenser
75.5°F
CWR to CT
Bypass
CHWS to FAB
Chiller (Typ. 2)
Heat Pump
Evaporator
39°F to
43.6°F
(Typical 2)
ICW/RO
Heat
Exchanger
1,200 gpm, Max. to
RO, 74.3°F Min.
ICW, 36°F Design Min., 54°F Avg.
ICW
1,880 gpm Max.
18.7°C). Evaluate impact to operating cost if software
uses a modified reset schedule.
Option 5
Install variable speed drives (VSDs) on as many chiller
compressor motors and condenser water pumps as economically
feasible (based on client criteria).
For more information on applicable codes and standards,
the reader can refer to the 2019 Oregon Zero
Energy Ready Commercial Code2 and ASHRAE/IES
Standard 90.1-2016, adopted in the State of Oregon
Building Codes Division. These documents address
chiller and cooling tower efficiency and require heat
recovery-either condenser water or exhaust-based for
new commercial buildings.
Evaluating Each Option
The piping configuration required to implement
Options 1 and 3 is shown in Figure 2. The CHWS pipe that
originally supplied chilled water to cool the oil free air
compressors has been replaced by a pipe labeled CHWR.
40
ASHRAE JOURNAL ashrae.org J U LY 2021
Option 1: Re-Piped Air Compressor Cooling Source
Since the heat from the air compressors is used preferentially
to heat industrial city water in the deionized
water plant, re-piping saved an average estimated
494 tons (1737 kW) cooling load because the industrial
city water is generally cold enough to provide nonchiller
cooling (54°F [12.2°C] average) by absorbing air
compressor heat. This change necessitated adding a
booster pump to overcome the head loss through the
oil free air compressors and a new heat exchanger.
Pumping energy cost was factored into the calculations.
Oil free air cooling water is the preferential heat source
(upper heat exchanger in Figure 2). For the analysis year,
615 gpm (140 m3/h) average industrial city water would
be heated by the new plate-and-frame heat exchanger
with recovered heat.
Option 2: Reset Chilled Water Supply Temperature
An annual hourly analysis showed that the semiconductor
factory cleanroom makeup air handlers could
meet the specified dew point with an annual average
CHWR
55°F
ICW/RO
Heat
Exchanger
76°F
ICW, 36°F Design Min., 54°F Avg.
275 gpm to 1,200 gpm
to RO, 74.3°F Min.
http://www.ashrae.org

ASHRAE Journal - July 2021

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

Contents
ASHRAE Journal - July 2021 - Intro
ASHRAE Journal - July 2021 - Cover1
ASHRAE Journal - July 2021 - Cover2
ASHRAE Journal - July 2021 - 1
ASHRAE Journal - July 2021 - Contents
ASHRAE Journal - July 2021 - 3
ASHRAE Journal - July 2021 - 4
ASHRAE Journal - July 2021 - 5
ASHRAE Journal - July 2021 - 6
ASHRAE Journal - July 2021 - 7
ASHRAE Journal - July 2021 - 8
ASHRAE Journal - July 2021 - 9
ASHRAE Journal - July 2021 - 10
ASHRAE Journal - July 2021 - 11
ASHRAE Journal - July 2021 - 12
ASHRAE Journal - July 2021 - 13
ASHRAE Journal - July 2021 - 14
ASHRAE Journal - July 2021 - 15
ASHRAE Journal - July 2021 - 16
ASHRAE Journal - July 2021 - 17
ASHRAE Journal - July 2021 - 18
ASHRAE Journal - July 2021 - 19
ASHRAE Journal - July 2021 - 20
ASHRAE Journal - July 2021 - 21
ASHRAE Journal - July 2021 - 22
ASHRAE Journal - July 2021 - 23
ASHRAE Journal - July 2021 - 24
ASHRAE Journal - July 2021 - 25
ASHRAE Journal - July 2021 - 26
ASHRAE Journal - July 2021 - 27
ASHRAE Journal - July 2021 - 28
ASHRAE Journal - July 2021 - 29
ASHRAE Journal - July 2021 - 30
ASHRAE Journal - July 2021 - 31
ASHRAE Journal - July 2021 - 32
ASHRAE Journal - July 2021 - 33
ASHRAE Journal - July 2021 - 34
ASHRAE Journal - July 2021 - 35
ASHRAE Journal - July 2021 - 36
ASHRAE Journal - July 2021 - 37
ASHRAE Journal - July 2021 - 38
ASHRAE Journal - July 2021 - 39
ASHRAE Journal - July 2021 - 40
ASHRAE Journal - July 2021 - 41
ASHRAE Journal - July 2021 - 42
ASHRAE Journal - July 2021 - 43
ASHRAE Journal - July 2021 - 44
ASHRAE Journal - July 2021 - 45
ASHRAE Journal - July 2021 - 46
ASHRAE Journal - July 2021 - 47
ASHRAE Journal - July 2021 - 48
ASHRAE Journal - July 2021 - 49
ASHRAE Journal - July 2021 - 50
ASHRAE Journal - July 2021 - 51
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ASHRAE Journal - July 2021 - 53
ASHRAE Journal - July 2021 - 54
ASHRAE Journal - July 2021 - 55
ASHRAE Journal - July 2021 - 56
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ASHRAE Journal - July 2021 - 58
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ASHRAE Journal - July 2021 - 61
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ASHRAE Journal - July 2021 - 63
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ASHRAE Journal - July 2021 - 105
ASHRAE Journal - July 2021 - 106
ASHRAE Journal - July 2021 - 107
ASHRAE Journal - July 2021 - 108
ASHRAE Journal - July 2021 - 109
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ASHRAE Journal - July 2021 - 111
ASHRAE Journal - July 2021 - 112
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