ASHRAE Journal - April 2020 - 42

2020

ASHRAE TECHNOLOGY AWARD CASE STUDIES

Global CLA
Humidity

Global CLA
Temperature

AI

AI

Data
Connection

AO R.F. Speed Control

Data Connection
Return Air
Temp

DI R.F. VFD Fault

FMCS

DO R.F. Start/Stop

VFD

Return
CO2

AI

DI R.F. VFD Status

AI

AI

AFMS

AI

TS4

26

RA
Humidity
HS2

CO2

Safety
Interlock
hi

DPS3

low

Smoke Smoke
Detector Detector
Safety
Interlock

AF

DI 26
DI
Safety
Interlock
SD3
SD4

26

D-2
NC

Building
Pressure
AI

Return Fan
Array

ACT

DPS5

Data
Connection

DO

To Space To OA

AO S.A. Speed Control

Floor Mixed Air
Status Temp 40°F Freezestat

D-3
NC

AI

hi

ACT
DO
MAX OA Damper

Filter

D-1
NC

MAX

DPS2

1

low

DPT1

hi

TS1

low

26

DI

Safety
Interlock
low

Prefilter Final Filter
hi

AI

AI
Mixed Air S.P.

AI

26

Safety
Interlock
FZ2 Set @ 40°F

Filter

IAQ
Sensors

AF

AI

DPS2

Safety
Interlock
DP

hi

DI
SD1

26

Safety
Interlock

Smoke
Detector
DI
SD2

26

AI
hi

DPT4

low

AFMS
AF

AI
Supply Static Pres SW

CHW

AI

AFMS

Data Connection

Smoke
S.A. Dewpoint Detector

DI S.A. VFD Status

AO
CHW Valve

AFMS

DPS1

low

Safety
Interlock

Supply Fan
Array

N.O.

AI

DO S.A. Start/Stop

CHWR
CHWS

AO

ACT

DI S.A. VFD Fault
VFD

TS3
AI

Supply Fan
Temp

hi

DPT3

low

AI
Supply Side Pres SW

AF

D-4
NC

hi

DPT4

low

AI
Supply Static Pressure
Interpass (Alternate 5)

ACT
AO

FIGURE 3 Dual-path air-handler diagram.

poor condition and well beyond their service life
expectancy. The prior fume exhaust air configuration allowed discharge into workers' breathing
zones and at velocities below 1,000 fpm [5 m/s].
In the new design, fume hoods, chemical storage
cabinets, and so on are served by one manifolded
exhaust system with N + 1 redundancy, facilitating
safe and efficient maintenance. Each exhaust fan
was sized, configured, and controlled so full system
design capacity can be maintained when any one
fan fails or is taken out of service. Isolation dampers were provided to allow each fan to be taken out
of service for maintenance, repair, or replacement,
while the exhaust system remains in operation at
full capacity.
Preheating/precooling of outside air via a refrigerant coil heat recovery system has low maintenance
requirements; it is a passive system with minimal
moving parts.

Cost-Effectiveness

The new, single-duct VAV design reuses existing
dual-duct air distribution (converted to all cold deck

42

ASHRAE JOURNAL

ashrae.org

APRI L 2020

operation). The original supply air and associated
ductwork was sized at 4,000 to 5,000 fpm (20 to 25
m/s). When the supply air was reduced and the hot
and cold deck ductwork connected to be served by a
single-duct VAV system, air velocities were reduced
to 1,500 to 2,000 fpm (7.6 to 10.2 m/s). This created
significant fan energy savings, while allowing costeffective reuse of most of the high-pressure supply
ductwork.
The original supply air total of 206,000 cfm
(97 221 L/s) was reduced to 150,000 cfm (70 792 L/s).
This reduction was supported by detailed load
analysis and made possible by consolidation of
AHUs, reduced lab air change rates, and use of passive chilled beams and low-velocity displacement
ventilation.
The consolidation of AHUs and lab exhaust fans
reduced initial, operational, and maintenance costs.
Baseline water and energy expenditure was
$1,577,493, annually. Through the project, five major
AHUs and eight smaller ones were replaced and
consolidated with two central, dual-path (outside
and return air), low-velocity AHUs. Sixty lab exhaust

IMAGE COURTESY G/ BA

From
Dedicated
Outdoor Air
System-1


https://www.ashrae.org

ASHRAE Journal - April 2020

Table of Contents for the Digital Edition of ASHRAE Journal - April 2020

Contents
ASHRAE Journal - April 2020 - Intro
ASHRAE Journal - April 2020 - Cover1
ASHRAE Journal - April 2020 - Cover2
ASHRAE Journal - April 2020 - 1
ASHRAE Journal - April 2020 - Contents
ASHRAE Journal - April 2020 - 3
ASHRAE Journal - April 2020 - 4
ASHRAE Journal - April 2020 - 5
ASHRAE Journal - April 2020 - 6
ASHRAE Journal - April 2020 - 7
ASHRAE Journal - April 2020 - 8
ASHRAE Journal - April 2020 - 9
ASHRAE Journal - April 2020 - 10
ASHRAE Journal - April 2020 - 11
ASHRAE Journal - April 2020 - 12
ASHRAE Journal - April 2020 - 13
ASHRAE Journal - April 2020 - 14
ASHRAE Journal - April 2020 - 15
ASHRAE Journal - April 2020 - 16
ASHRAE Journal - April 2020 - 17
ASHRAE Journal - April 2020 - 18
ASHRAE Journal - April 2020 - 19
ASHRAE Journal - April 2020 - 20
ASHRAE Journal - April 2020 - 21
ASHRAE Journal - April 2020 - 22
ASHRAE Journal - April 2020 - 23
ASHRAE Journal - April 2020 - 24
ASHRAE Journal - April 2020 - 25
ASHRAE Journal - April 2020 - 26
ASHRAE Journal - April 2020 - 27
ASHRAE Journal - April 2020 - 28
ASHRAE Journal - April 2020 - 29
ASHRAE Journal - April 2020 - 30
ASHRAE Journal - April 2020 - 31
ASHRAE Journal - April 2020 - 32
ASHRAE Journal - April 2020 - 33
ASHRAE Journal - April 2020 - 34
ASHRAE Journal - April 2020 - 35
ASHRAE Journal - April 2020 - 36
ASHRAE Journal - April 2020 - 37
ASHRAE Journal - April 2020 - 38
ASHRAE Journal - April 2020 - 39
ASHRAE Journal - April 2020 - 40
ASHRAE Journal - April 2020 - 41
ASHRAE Journal - April 2020 - 42
ASHRAE Journal - April 2020 - 43
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ASHRAE Journal - April 2020 - 45
ASHRAE Journal - April 2020 - 46
ASHRAE Journal - April 2020 - 47
ASHRAE Journal - April 2020 - 48
ASHRAE Journal - April 2020 - 49
ASHRAE Journal - April 2020 - 50
ASHRAE Journal - April 2020 - 51
ASHRAE Journal - April 2020 - 52
ASHRAE Journal - April 2020 - 53
ASHRAE Journal - April 2020 - 54
ASHRAE Journal - April 2020 - 55
ASHRAE Journal - April 2020 - 56
ASHRAE Journal - April 2020 - 57
ASHRAE Journal - April 2020 - 58
ASHRAE Journal - April 2020 - 59
ASHRAE Journal - April 2020 - 60
ASHRAE Journal - April 2020 - 61
ASHRAE Journal - April 2020 - 62
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ASHRAE Journal - April 2020 - 96
ASHRAE Journal - April 2020 - Cover3
ASHRAE Journal - April 2020 - Cover4
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