NARAGHI HALL 3rd FLOOR VENTILATION MANAGEMENT

IMPROVEMENT

BEST PRACTICE AWARD HVAC DESIGN/RETROFIT

2014 CALIFORNIA HIGHER EDUCATION SUSTAINABILITY CONFERENCESAN DIEGO STATE UNIVERSITY

• Geng Liu• Energy Manager, CSU

Stanislaus• Brady Nations

• Regional Manager, Aircuity

Naraghi Hall of Science, 3Naraghi Hall of Science, 3rdrd floor lab spaces floor lab spaces

Occupied 2007Occupied 2007 Third floor included special lab Third floor included special lab

spacesspaces Designed for constant 10 ACH, Designed for constant 10 ACH,

24/724/7

Aircuity retrofit project objectivesAircuity retrofit project objectives

Implement demand control ventilationImplement demand control ventilation 13 lab areas13 lab areas

Implement new hood minimums based on ANSI Implement new hood minimums based on ANSI Z9.5Z9.5 Minimum flow when hood closedMinimum flow when hood closed Cooling & Heating prevented reaching full Z9.5 Cooling & Heating prevented reaching full Z9.5

minmin100 FPM Face velocity maintained in all cases100 FPM Face velocity maintained in all cases

Convert constant volume EF w/ bypass dampers to Convert constant volume EF w/ bypass dampers to VFDVFD

Bringing projects to realityBringing projects to reality

Identify Energy Saving OpportunitiesIdentify Energy Saving Opportunities Perform Feasibility StudyPerform Feasibility Study Project Fund AvailabilityProject Fund Availability Management successfully implements Management successfully implements

energy saving projects, and savings are energy saving projects, and savings are put to work on additional future energy put to work on additional future energy projectsprojects

ResultsResults

Reduced Average airflow from 22,100 Reduced Average airflow from 22,100 to13,900 CFMto13,900 CFM

EF speed reduction from Constant 60 EF speed reduction from Constant 60 Hz to Avg. ~40 HzHz to Avg. ~40 Hz

EnergyEnergy 492,000 kWh492,000 kWh 14,213 Therms14,213 Therms

All From ~ 16,000 Sq. Ft.All From ~ 16,000 Sq. Ft.

Results: Additional benefits of ProjectResults: Additional benefits of Project

Reduced Noise Level-IndoorReduced Noise Level-Indoor Reduced Noise Level-OutdoorReduced Noise Level-Outdoor Significantly reduced fire damper Significantly reduced fire damper

malfunctions & resulting pressure malfunctions & resulting pressure problemsproblems

Widened unoccupied temperature Widened unoccupied temperature deadbanddeadband

Project EconomicsProject Economics

Total Cost $190,000

Annual Cost Savings Achieved ($/yr)

$63,413

Simple Payback Before Incentive

3.0

Understanding DCVUnderstanding DCV

Traditional approach: Traditional approach:

10 ACH 10 ACH

24/724/7

Just in case thereJust in case there’’s s something there.something there.

Does this room need 10 ACH?Does this room need 10 ACH?

Principle of DCVPrinciple of DCV

Continuously measure for airborne contaminants

When present: VENTILATE at design levels

When not present: Use energy effective level

Example of contaminant measurementExample of contaminant measurement

Lab contaminant eventLab contaminant event

0

0.5

1

1.5

2

2.5

3

3.5

0

100

200

300

400

500

600

700

800

900

Mon

5/1

2/14

4:5

0

Mon

5/1

2/14

5:4

5

Mon

5/1

2/14

6:2

7

Mon

5/1

2/14

7:0

6

Mon

5/1

2/14

8:0

0

Mon

5/1

2/14

8:4

5

Mon

5/1

2/14

9:2

8

Mon

5/1

2/14

10:

08

Mon

5/1

2/14

10:

48

Mon

5/1

2/14

11:

36

Mon

5/1

2/14

12:

16

Mon

5/1

2/14

12:

56

Mon

5/1

2/14

13:

40

Mon

5/1

2/14

14:

43

Mon

5/1

2/14

15:

39

Mon

5/1

2/14

16:

40

Cont

amin

ant

leve

l: T

VOC

(PPM

)

Flow

: CF

M

Lab contaminant event

Supply flow

TVOC level

The Aircuity SystemThe Aircuity System

Continuously monitors for airborne contaminants TVOCs Airborne Particulate

CO2

CO

When presents “requests” additional ventilation

Always active

Not an override

Typical Lab Design showing OptiNet

Fume Hood

Supply Air

General Exhaust

Hood exhaust

Ventilation Controls

OptiNet Sampling

Point

OptiNet Sensor Suite

Sensor Suite (SST)Sensor Suite (SST)

Houses the critical instruments

Located in an equipment room

All service work is done here.

Questions?

Thank you