naraghi hall 3 rd floor ventilation management improvement
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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
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