ASHRAE Journal - April 2020 - 40

2020

ASHRAE TECHNOLOGY AWARD CASE STUDIES

Data Connection

Data Connection

Data Connection
AO S.A. Speed Control
DI S.A. VFD Fault
VFD

Heat Pipe
Exhaust
Outlet Temp

Heat Pipe
Exhaust
Inlet Temp

Filter
Status
AI

AI

AI

TS4

TS5

26

AO S.A. Speed Control
VFD

DO S.A. Start/Stop
DI S.A. VFD Status

DI S.A. VFD Fault
DO S.A. Start/Stop

VFD

DO S.A. Start/Stop
DI S.A. VFD Status

26

26

DI S.A. VFD Status
26

26

26

HEF 1A

DPS

AO S.A. Speed Control

DI S.A. VFD Fault

HEF 1B

HEF 1C

AI
IAQ Sensors

HP

Filter

Building
Exhaust
Air

high

Heat
Pipe

DPT1

low

ACT

AI

HEF Inlet
Press

AO

Data
Connection
AO S.A. Speed Control

AI

DI

TS1 IAQ Sensor

FZ1

DI

Safety
Interlock
Set @ 35°F

FZ2

HW

HP

low

Filter

Filter

D-1
NC

Max.

DPS2

AI

DI S.A. VFD Status
26

Safety
Interlock
Set @ 40°F

low

PH Coil DAT

AO

CHW Valve

Remote DP
DPT AI
CHWR

N.O.

N.O.

AI

CHWR
CHWS

HW Valve

HWS

AO

HWR

DO

MAX. OA
Damper

CHW Valve

TS2

Filter

AI

26

Final
Prefilter
ACT

SA
Smoke
Dewpoint Detector

DO S.A. Start/Stop

DPS2

Safety
Interlock

DP

hi

Safety
Interlock

DI
SD1

Smoke
Detector

26

Safety
Interlock

DI

26

SD2

hi

AO BI

LPS
PC

CHWS

DPS1

RO

low

Supply Fan Array

Safety
Interlock

TS3

FS

HHT

Supply Air Temp AI

ECM 3,
Alternate 1

DPT1

low

AI

BI

BI
BI

high

ECM 3,
Alternate 1

Supply Static
Pres

FIGURE 2 Dedicated outdoor air system (DOAS) and exhaust fan system schematic.

The AHUs were fully operational before successive, existing AHUs were demolished and switched
over, minimizing shutdowns. The air distribution
throughout the building was then renovated to
meet the owner's phasing requirements, with local
shutdowns done in three- to five-room groupings,
while the remainder of the building remained fully
operational.
Low-velocity supply air diffusers in labs were
located such that airflow was introduced into the lab
without creating turbulence around any fume hood
or other equipment that is sensitive to air currents.
Demand-based control of exhaust fans used sensors to monitor contaminants within an exhaust
plenum. Measurements were compared with predetermined thresholds, and higher stack velocity was
triggered if the predetermined contaminant levels
were exceeded.
Passive technologies of displacement ventilation,
coupled with convective and radiant cooling, shifted
cooling capacity from an all-air system to a waterbased system, when possible.
A new process water system (60°F [15.6°C] supply
40

ASHRAE JOURNAL

ashrae.org

APRI L 2020

water temperature) was used to serve convective
chilled beams, while converting all lab processequipment cooling from domestic water (once
through to drain) to a closed-loop process water
system, with a plate and frame heat exchanger
served by plant chilled water. By the end of construction period Year 3, this strategy resulted in a
44% reduction of annual building domestic water
use vs. the baseline (from 38,013 kgal to 21,349 kgal
[143,894,858 L to 80,814,756 L]). Newly available
data from 2019 indicate even more dramatic results
(usage of only 4,810 kgal [18,207,831 L], or an 87.35%
reduction versus the baseline).

Operations and Maintenance (O&M)
The existing AHUs were in poor condition and well
past their service life expectancy, and the mechanical room layout impeded the maintenance staff.
The new design includes equipment consolidation,
along with replacements. Fewer pieces of equipment, and new layouts and service corridors, will
make future maintenance easier.
The existing lab hood exhaust fans were also in

IMAGE COURTESY G/ BA

AI

VFD

40°F
Freezestat

35°F
Freezestat

CHW

Filter
Status
high

DI S.A. VFD Fault

Heat
Recovery
Air Temp


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
ASHRAE Journal - April 2020 - 44
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
ASHRAE Journal - April 2020 - 63
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ASHRAE Journal - April 2020 - 69
ASHRAE Journal - April 2020 - 70
ASHRAE Journal - April 2020 - 71
ASHRAE Journal - April 2020 - 72
ASHRAE Journal - April 2020 - 73
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ASHRAE Journal - April 2020 - 96
ASHRAE Journal - April 2020 - Cover3
ASHRAE Journal - April 2020 - Cover4
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