The Florida State University
Ringling Conservation Center
Sarasota, Florida
Linda Lewis
Mechanical Option
Spring 2005
Linda Lewis Mech Option The FSU Ringling Conservation Center
Presentation Outline• General Information• Project Team• Existing Design• Redesign Goals• Design Considerations• Mechanical Redesign• Acoustical Analysis• Lighting Analysis• Conclusion and Recommendations• Acknowledgements• Questions
Linda Lewis Mech Option The FSU Ringling Conservation Center
General Information• Located- Sarasota Florida
on the Ringling Campus• John Ringling – Sarasota is
the Circus Capitol of the World
• Campus• Museum of Art• Cà d´zan• Circus Museum• Conservation Center
• Florida State University
Linda Lewis Mech Option The FSU Ringling Conservation Center
General Information• Size-
• 3 Stories• 73,000 sq ft Building• 23,000 sq ft Parking
Garage/ Loading Deck
• Building Functions- • Art Conservation- 2,020 Sq Ft• Art Library- 17,050 Sq Ft• Art Storage -4330 Sq Ft • Classrooms- 2989 Sq Ft• Offices- 4655 Sq Ft
• Unique Features-• Lobbies, Corridors and Elevators – Fit large
Pieces of artwork• Art Conservation Lab– Self Balancing System
Second Floor
First Floor
Linda Lewis Mech Option The FSU Ringling Conservation Center
Presentation Outline• General Information• Project Team• Existing Design• Redesign Goals• Design Consideration• Mechanical Redesign• Acoustical Analysis• Lighting Analysis• Conclusion Recommendations• Acknowledgements• Questions
Linda Lewis Mech Option The FSU Ringling Conservation Center
Project Team• Owner: Sarasota County • Architect: Hellmuth, Obata +
Kassabaum, Inc. (HOK) – Tampa, Florida
• MEP & Technology: TLC Engineering for Architecture – Tampa, Florida
• Structural Engineer: Master Consulting Engineers – Tampa, Florida
• Construction Manager: To Be Determined– GC Hard Bid with GMP on Final CD’s
Linda Lewis Mech Option The FSU Ringling Conservation Center
Presentation Outline• General Information• Project Team• Existing Design• Redesign Goals• Design Considerations• Mechanical Redesign• Acoustical Analysis• Lighting Analysis• Conclusion Recommendations• Acknowledgements• Questions
Linda Lewis Mech Option The FSU Ringling Conservation Center
Existing Conditions• Mechanical
• 8 Air Handling Units (50,790 cfm)• 3-Constant Volume – EDH and Humidifiers
• Serve Art Storage Areas
• 3-Variable Air Volume (VAV) – Electric Reheat• Serve 2nd Floor- Classroom, Office Area, Library
• 2-VAV Dual Path- Electric Reheat• Dual Path- Separate Cooling Coils for RA and OA • Serve 1st Floor- Classrooms, Library
• Chiller Plant• Provides Chilled Water for
the Entire Campus
Linda Lewis Mech Option The FSU Ringling Conservation Center
Presentation Outline• General Information• Project Team• Existing Design• Redesign Goals• Design Consideration• Mechanical Redesign• Acoustical Analysis• Lighting Analysis• Conclusion and Recommendations• Acknowledgements• Questions
Linda Lewis Mech Option The FSU Ringling Conservation Center
Redesign Goals• To Save Energy
• 71% of the US Electricity comes from Fossil Fuels
• Fossil Fuels Create Emissions • Green House Effect• DOE - 40-60% of Electricity is used
in HVAC Systems• 80% of Electricity in the South is
used by HVAC
Linda Lewis Mech Option The FSU Ringling Conservation Center
Redesign Goals• Improve Indoor Air Quality (IAQ)
• The Environmental Protection Agency (EPA)- 90% of our time indoors
• Mild effects of poor IAQ are: irritation of the eyes, nose, and throat, headaches, dizziness, and/or fatigue
• Serious effects of poor IAQ: respiratory cancer, chronic obstructive pulmonary disease or immunologic disorders
• Asthma Numbers are Increasing• Poor indoor air quality can result in a decrease in
productivity of workers and larger numbers of absenteeism’s.
• Lower Operation Costs
Linda Lewis Mech Option The FSU Ringling Conservation Center
Presentation Outline• General Information• Project Team• Existing Design• Redesign Goals• Design Considerations• Mechanical Redesign• Acoustical Analysis• Lighting Analysis• Conclusion and Recommendations• Acknowledgements• Questions
Linda Lewis Mech Option The FSU Ringling Conservation Center
Design Considerations• Outdoor Conditions
• Summer• 93°F DB, 80°F WB
• Winter• 39°F DB
• Indoor Conditions• General Occupancy Areas
• Summer - 72°F DB, 50% RH• Winter - 68°F DB, 55% RH
• Areas with Art work• All Year - 70°F DB, 50% RH
Linda Lewis Mech Option The FSU Ringling Conservation Center
Design Considerations• Proposal
• Energy Recovery Wheels• Enthalpy Wheels
• Thermal Storage• Partial Storage• Load Leveling
Linda Lewis Mech Option The FSU Ringling Conservation Center
Presentation Outline• General Information• Project Team• Existing Design• Redesign Goals• Design Considerations• Mechanical Redesign• Acoustical Analysis• Lighting Analysis• Conclusion and Recommendations• Acknowledgements• Questions
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Enthalpy Wheels
• Background Information• Can Reduce Outdoor Air Load on the
Cooling Coil • Help in better IAQ
• Remove containments from the air• Allows for a more energy efficient way of
bringing in appropriate ventilation air (ASHRAE Standard 62)
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Enthalpy Wheels
• Air Handling Units• Novel Aire Wheels
AHU SA cfm OA cfm EA cfm
AHU 1-1 990 590 470
AHU 1-2 2500 1540 1380
AHU 1-3 4870 4870 4870
AHU 1-4 1450 580 480
AHU 1-5 3100 420 320
AHU 2-1 5600 2000 1380
AHU 2-2 10,000 7600 4500
AHU 2-3 880 580 480
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Enthalpy Wheels
• Calculations• Bin Year
• Occupied vs Unoccupied• Summer vs School Year
Novel Aire Simulation Program
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Enthalpy Wheels
• Wheel Operation• On When Sum of Sensible and Latent
Savings is Positive• Off When Sum of Sensible and Latent
Savings is Negative• Modulate When Outdoor Air Temperature
is Lower than Supply Air Temperature• When Heating the Air the Air is also Humidified
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Enthalpy Wheels
• Summary of Results
AHU Without EW
kBtuWith EW
kBtuSavings
Total kBtu % Savings
AHU 1-1 240,855 157,954 82,901 34%
AHU 1-2 458,110 317,167 140,943 31%
AHU 1-3 823,124 533,994 289,131 35%
AHU 1-4 197,700 133,077 64,622 33%
AHU 1-5 129,219 88,252 40,966 32%
AHU 2-1 639,188 435,785 203,404 32%
AHU 2-2 1,208,102 855,603 352,498 29%
AHU 2-3 109,287 67,995 41,292 38%
Total Outdoor Air Load Savings
. • Total Savings – 33%
• Of the Total
•Latent – 84%
•Sensible – 16%
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Enthalpy Wheels
• Wheels Savings
AHU On Peak kWh
per YearOff Peak kWh
Per YearOn Peak kWh
CostOff Peak kWh
Cost
AHU 1-1 5,033.7 8948.9 $120.00 $66.31
AHU 1-2 10,667.7 18964.8 $254.32 $140.53
AHU 1-3 21,702.3 38581.9 $517.38 $285.89
AHU 1-4 3,023.3 5374.7 $72.07 $39.83
AHU 1-5 3,087.4 5488.7 $73.60 $40.67
AHU 2-1 15,328.0 27249.7 $365.42 $201.92
AHU 2-2 26,595.1 47280.1 $634.03 $350.35
AHU 2-3 3,062.6 5444.6 $73.01 $40.34
Totals 88,500 157,334 $2,110 $1,166
Total Cost Savings
Wheel PriceNumber of
WheelsInstallation
Cost Total Cost
ECW 204 $600.00 1 $420.00 $1,020.00
ECW 244 $900.00 3 $420.00 $3,120.00
ECW 364 $1,500.00 2 $505.00 $3,505.00
ECW 544 $3,400.00 1 $630.00 $4,030.00
ECW 724 $6,100.00 1 $630.00 $6,730.00
Totals $12,500 8 $2,605 $18,405
Enthalpy Wheel First Cost
• First Cost Wheels
Cost Savings: $3276
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Enthalpy Wheels
• Cost Analysis• Wheels - $18,405• Reconfiguring AHU and Ductwork - $5000• Reduction in Cooling Coil Size - $7900
• Conclusions• Payback just using kWh Savings – 4.7 Yrs
• Less with On Peak kW Demand Reduction
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Thermal Storage
• Current Chiller Plant• 2 – 650 Water Cooled Centrifugal
Chillers• Provide 40°F Water
• Ice Storage• York Chillers• Calmac Icetanks
• Melted Ice on Coil
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Partial Storage
• Florida Power and Light• Time of Use Rates
kW Demand
Monthly Demand Charge
On Peak kW Charge
On Peak kWh
Charge
Off Peak kWh
Charge
21-499 $38.58 $8.16 3.337¢ 1.021¢
500 -1999 $38.12 $8.15 2.279¢ 0.788¢
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Partial Storage
July
0.0
100.0
200.0
300.0
400.0
500.0
600.0
700.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Hour
Tons July
BASE LOAD CHILLER
STORE
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Partial Storage
•Calculations•Bin Year•March Design Day
•4500 Ton Hours Needed•500 Ton Ice Chiller for 9 Hours
• Savings
Month
WithoutThermalStorage
ThermalStorage Difference
January 466 109 357
February 525 109 416
March 455 109 346
April 550 109 441
May 580 109 471
June 580 109 471
July 576 109 467
August 578 109 468
September 565 109 455
October 553 109 443
November 510 109 401
December 505 109 396
On-Peak kW Demand
Category
WithoutThermalStorage
ThermalStorage
Total kWh 2,383,225 2,737,355
kWh On-Peak 1,380,196 358,030
kWh Off-Peak 1,003,029 2,379,325
% kWh On-Peak 57.9% 13.1%
% kWh Off-Peak 42.1% 86.9%
Summary of kwh Usage
Month
Electric Bill w/out
Thermal Storage
Electric Bill w/ Thermal
Storage Savings
January $5,882 $3,291 $2,591
February $6,199 $3,126 $3,073
March $5,913 $3,460 $2,453
April $7,806 $3,845 $3,961
May $7,694 $4,252 $3,441
June $8,331 $4,132 $4,199
July $8,624 $4,422 $4,202
August $8,513 $4,254 $4,259
September $8,308 $4,162 $4,146
October $8,149 $4,194 $3,955
November $6,477 $3,598 $2,879
December $6,186 $3,311 $2,875
Total Price $88,083 $46,047 $42,035
Totals Partial Storage Savings
Average On Peak kW Shift – 428 kW
52% Reduction in Operation Cost
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Partial Storage
• First Cost – RS Means
EquipmentThermal Storage
Ice Chiller 500 tons $250,000
Base Load Chiller 180 ton $94,250
Redundant Chiller 500 Tons $169,600
Ice Storage Tanks (4560 Ton-hr) $456,000
Total $969,850
Thermal Storage First Cost
EquipmentOriginal System
650 Ton Chiller $215,000
650 Ton Chiller Redundant $215,000
Total $430,000
Original System First Cost
Cost of Thermal Storage System = 125% Increase
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Partial Storage
• Cost Analysis• First Cost Difference = $539,850• Inflation Rate of Money = 1.023%• Annual Savings = $42,035
• Payback Period = 12 Yrs
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Load Leveling
July
0.0
100.0
200.0
300.0
400.0
500.0
600.0
700.0
800.0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Hour of the Day
To
ns
July
STORE
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Load Leveling
•Calculations•July Design Day
•2650 Ton Hours Needed•310 Ton Ice Chiller
• Savings
Month
Electric Bill w/out
Thermal Storage
Electric Bill w/ Thermal
Storage Savings
January $5,821 $5,262 $559
February $6,619 $6,012 $607
March $5,707 $5,185 $522
April $7,529 $5,985 $1,544
May $8,005 $6,426 $1,578
June $8,111 $6,632 $1,479
July $8,199 $6,864 $1,335
August $8,115 $6,412 $1,703
September $7,960 $6,302 $1,658
October $7,854 $6,287 $1,567
November $6,450 $5,889 $561
December $6,317 $5,693 $624
Total Price $86,687 $72,949 $13,738
Totals Load Leveling Savings
Month
Without Thermal Storage
Thermal Storage Difference
January 466 266 200
February 525 304 221
March 455 262 193
April 550 293 257
May 580 315 265
June 580 325 255
July 576 336 240
August 578 314 264
September 565 309 256
October 553 308 244
November 510 298 212
December 505 288 217
On-Peak kW Demand Load Leveling
Category
Without Thermal Storage Thermal Storage
Total kWh 2,383,225 2,629,290
kWh On-Peak 1,380,196 978,638
kWh Off-Peak 1,003,029 1,650,653
% kWh On-Peak 57.9% 37.2%
% kWh Off-Peak 42.1% 62.8%
Summary of kwh Usage Load Leveling
16% Reduction in Operation Cost
Average On Peak kW Shift – 235 kW
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Load Leveling
• First Cost – RS Means
Thermal Storage First Cost
EquipmentOriginal System
650 Ton Chiller $215,000
651 Ton Chiller Redundant $215,000
Total $430,000
Original System First Cost
Cost of Thermal Storage System = 50% Increase
Equipment Thermal Storage
Ice Chiller 320 tons $160,000
Redundant Chiller 650 Tons $215,000
Ice Storage Tanks (2660 Ton-hr) $266,000
Total $641,000
Linda Lewis Mech Option The FSU Ringling Conservation Center
Mechanical Redesign- Load Leveling
• Cost Analysis• First Cost Difference = $211,000• Inflation Rate of Money = 1.023%
• Annual Savings = $13,738
• Payback Period = 15.5 Yrs
Linda Lewis Mech Option The FSU Ringling Conservation Center
Presentation Outline• General Information• Project Team• Existing Design• Redesign Goals• Design Considerations• Mechanical Redesign• Acoustical Analysis• Lighting Analysis• Conclusion and Recommendations• Acknowledgements• Questions
Linda Lewis Mech Option The FSU Ringling Conservation Center
Acoustical AnalysisReverberation Time
Freq T60Range 0.6 to
1.4
125 0.43 Good
250 1.22 Good
500 2.01 High
1000 2.79 High
2000 1.86 High
4000 1.86 High
•Room Dimensions- 76’x 30’x 20’
A
VT 05.060
iSiA
Linda Lewis Mech Option The FSU Ringling Conservation Center
Acoustical Analysis•Echo Eliminator
•Recycled Cotton - Green•2”- 2’x4’- (320ft2 = 40 Panels)
Freq α_PanelPanelArea T60
125 0.17 320 0.42
250 0.6 320 1.00
500 1.16 320 1.18
1000 1.21 320 1.38
2000 1.14 320 1.13
4000 1.22 320 1.10
•Cost•$1.75/ft2 = $560•Shipping = $40
Linda Lewis Mech Option The FSU Ringling Conservation Center
Presentation Outline• General Information• Project Team• Existing Design• Redesign Goals• Design Considerations• Mechanical Redesign• Acoustical Analysis• Lighting Analysis• Conclusion and Recommendations• Acknowledgements• Questions
Linda Lewis Mech Option The FSU Ringling Conservation Center
Lighting Analysis
• Classroom Current Design• 2’x 2’ two lamp, Parabolic
Louvered, lay-in Fluorescent Fixtures
• Classroom Functions
•Teaching
•Creating Artwork
• New Design• Direct/Indirect Fixtures• Incandescent Downlights
• Lamps• Daylight – 5000 K• Incandescent – Natural Light• Fluorescent – 4100 K (CRI = 85)
Linda Lewis Mech Option The FSU Ringling Conservation Center
Presentation Outline• General Information• Project Team• Existing Design• Redesign Goals• Design Considerations• Mechanical Redesign• Acoustical Analysis• Lighting Analysis• Conclusion and Recommendations• Acknowledgements• Questions
Linda Lewis Mech Option The FSU Ringling Conservation Center
Conclusions and Recommendations
• Add Enthalpy Wheels• Payback Period 4.7 Years• Decrease kW Demand
• Do Not Use Thermal Storage• Both Partial Storage and Load Leveling have
too high of Payback Periods
• Use More Smaller Chillers• Add Acoustical Panels
• For a Low Cost Fix the Echo
• Change Lighting in the Classroom Areas• Provide Better Lighting for Students to Learn
Linda Lewis Mech Option The FSU Ringling Conservation Center
Presentation Outline• General Information• Project Team• Existing Design• Redesign Goals• Design Considerations• Mechanical Redesign• Acoustical Analysis• Lighting Analysis• Conclusion and Recommendations• Acknowledgements• Questions
Linda Lewis Mech Option The FSU Ringling Conservation Center
AcknowledgementsSpecial Thanks To:
• Dr. Freihuat• Dr. Mumma• Dr. Bahnfleth• Dr. Burroughs• AE Faculty• AE Staff• Novel Aire –
David McDonald• Family• Friends• AE Class of 2005
Linda Lewis Mech Option The FSU Ringling Conservation Center
Questions? ???
?
?
?
Linda Lewis Mech Option The FSU Ringling Conservation Center
Desiccant Dehumidification
System
Leaving DB
Leaving Gr/lb
OA Sensible CC Load
Btu
OA Latent
CC Load Btu
Sensible OA Load with EW
Btu
Latent OA Load
w/EW Btu
Sensible OA Load
Savings Btu
Latent OA
Load Savings
Btu
Total Savings Btu
Enthalpy Wheel 74.2 76.3 47,153 87,863 33,402 30,732 13,751 54,461 68,212
Active Desiccant 111.1 74.9 47,153 87,863 80,449 29,631 -33,297 58,232 24,935
Overall Savings of Active Desiccant is 37% of the EW Savings
Linda Lewis Mech Option The FSU Ringling Conservation Center
Using Smaller Chillers• Current Chiller Design 2 – 650 Ton
Chillers• Proposed to use
• 2 – 350 Ton Chillers• 1 – 300 Ton Chiller
• Advantages• Lessen Redundant Capacity Needed• Increase Efficiency- Decreasing Energy• Approximate Savings - $8,000
Electricity/Yr• First Cost – 20% Reduction in Cost• Still have the Ability to Add to Plant
Linda Lewis Mech Option The FSU Ringling Conservation Center
Existing Conditions• Electrical
• 2000 amp, 480/277, 3 phase, 4 wire system • 8 step down transformers– 208Y/120• Lighting
• Lobbies- Compact Fluorescent Downlights• Classrooms- 2’x 2’—2 lamp parabolic louvered fluorescents• Storage Areas- 4’—2 lamp industrial strip fixtures • Conservation Lab-8’—2 lamp direct/indirect pendant fluorescents
• Structural• 3 Story Concrete Structure
• Poured Concrete Columns• Precast Sofit Beams• Precast Concrete Joists – Ribs 5’ OC• Floor– Pour Concrete• Lateral System- Braced Steel Frame• Roof– Standing Seam Metal
• Technology• Telephone outlets- Offices & Classrooms• Television – Classrooms• Ethernet- Classrooms, Library, Offices, Conservation Lab
Linda Lewis Mech Option The FSU Ringling Conservation Center
Design Considerations• Building Operation
• Library:• September-April
Monday-Sunday 7am – 9pm• May-August
Monday-Sunday 7am – 6pm
• All other Areas:Monday-Sunday 7am – 5pm
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