MBNA Career Services Center

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MBNA Career Services Center
The Pennsylvania State University University Park
Campus
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Overview
MBNA Career Services Center

• General Information
• Existing System
• Mechanical
• Electrical
• Structural
• Proposed System
• Considerations
• Goals
• Mechanical
• Electrical
• Structural
• Cost Analysis
• Energy Analysis
• Conclusion

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MBNA Career Services Center

• General Information

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Background

• Home of Penn States Career Services
• Located along Bigler Road across from Outdoor
  Pool
• Office Type Building
• 44,000 sq.ft.
• 4 floors
• Total Cost 9.5 million
• Completed July 2002

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
Picture taken from PSU Office of Physical Plant
Website
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Project Team

• Owner The Pennsylvania State University
• Architect Weber Murphy Fox
• Engineer (M,E,P,S) H.F. Lenz, Co.
• Construction Manager Alexander Constructors
• Mechanical/Plumbing Prime Silvertip
• Electrical Prime Ross Enterprises
• Structural Prime Amthor Steel

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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MBNA Career Services Center

• Existing Systems

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Mechanical

• Air Side
• Variable Air Volume system
• Three Air Handling Units
• AHU 1 Serves Program Spaces
• Location Basement
• 3500 cfm
• AHU 2 Serves 1st 2nd Floor Spaces
• Location Basement
• 28,000 cfm
• AHU 3 Serves 3rd Floor Spaces
• Location 3rd Floor
• 7900 cfm

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Mechanical

• Water Side
• Cooling
• Chilled water available from Computer Building
• Total Cooling Load 133 tons
• 45F Chilled Water
• Heating
• Steam from Penn States campus distribution
  system
• Heat exchanger steam to hot water
• 180F Hot Water

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Electrical

• Main Service
• 208Y/120V-3P-4W, 1200A Main Distribution Panel
• Emergency Power
• 208Y/120V-1P-3W, 100A Panel

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Structural

• Structural Steel Frame
• Long Span Steel Joists
• Wide Flange Beams
• Brick Façade with Metal Stud Backup
• Structural System unlike most other buildings at
  Penn State masonry bearing wall systems
• Reasons for this Type of Structural System
• First Cost
• Scheduling

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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MBNA Career Services Center

• Proposed System

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Considerations

• Air Side Issues
• 220 sq.ft. Mechanical Room on 3rd Floor
• Valuable space along north side (front)
• Multiple duct shafts

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
SA Shaft (Proposed System)
RA Shaft (Proposed System)
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Considerations

• Water Side Issues
• Relies on Computer Building for Chilled Water
• Construction of North Campus Chiller Plant
• Begins Summer 2003
• Will serve the MBNA Center

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Goals

• Eliminate 3rd Floor Mechanical Room
• Reduce Size of Ductwork
• Reduce Vertical Mechanical Space
• Improve Indoor Air Quality
• Supply ventilation air closer to spaces
• Reduce Electrical Energy Usage

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
Dedicated Outdoor Air with Fan Coil Units
Proposed System
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Mechanical

• Dedicated Outdoor Air System (DOAS)
• One Air Handling Unit with Enthalpy Wheel
  Energy Recovery Unit (ERU)
• Location Basement
• Outdoor Air Required 11,210 cfm
• Cooling Load 40 tons
• Energy Recovery with Enthalpy Wheel
• 73 Efficiency
• Removes moisture from air during Summer
• Humidifies dry winter air

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Mechanical

• Fan Coil Units (FCU)
• Why FCUs?
• Impractical to take care of Latent Load at ERU
• Circulate room air with a reduced percentage of
  OA during unoccupied times
• Approx. same locations as VAV boxes
• Most located in corridors
• Mix Outdoor Air from ERU with Plenum Air
• Either 1,2 or 3 Rooms on each FCU
• 69 tons - Total Cooling Load for all FCUs

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Mechanical

• Scheduling/Controls
• Daytime
• 44 Interview Rooms
• Occupancy Based on Schedule
• Occupied 100 OA
• Unoccupied 20 OA
• All Other Spaces
• Occupied 100 OA

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Mechanical

• Scheduling/Controls
• Nighttime
• Energy Recovery Unit off
• Fan Coil Units
• Maintain Setback Temperature Winter Only

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Electrical

• Motor Circuit Feeder Sizing
• Wire Sizing (NEC Section 430-22)
• (FLA of largest motor125)(FLA sum of all
  other motors)
• Typ. Wire Size 12THW
• Time Delay Circuit Breaker (NEC Section 430-152)
• (FLA of largest motor250)(FLA sum of all
  other motors) minimum required breaker rating
• Typ. Breaker Size 20A

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Electrical

• Circuit Layout
• 1 to 2 Fan Coil Units per Circuit
• 120V, 1 Phase, 20A breaker
• 3 Adjacent Circuits (A,B,C) Serve 4 to 6 Fan Coil
  Units Located Close Together
• Share Neutral Wire

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Structural

• Extend Supply Duct to 3rd Floor
• Create vertical shaft near elevator

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
SA Duct
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Structural

• Extend Return Duct to 3rd Floor
• Impossible to go straight up through Floor
• Travel under Floor between Joists

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
Stairs
Joists
RA Duct
Copy
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Structural

• Implications of Removing 3rd Floor Mechanical
  Room
• Remove AHU 3 Ducts 3000 lbs
• Reduce size of Long Span Open Web Steel Joist
• Assume New Use for Room - Office

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Cost Analysis

• Ductwork Comparison

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion

• New System uses 44 less Ductwork by Weight

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Cost Analysis

• Mechanical System Area Comparison

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Cost Analysis

• Existing System Items Eliminated
• Mechanical Equipment cost from TRANE

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Cost Analysis

• Proposed System Items Added

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion

• 10,800 Additional Cost for Proposed System

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Energy Analysis

• Using Carriers Hourly Analysis Program
• Simulate Existing System Proposed System
• 0.023 per kWh (PSUs Electricity Rate)
• Typical Schedule (excluding Interview Rooms)
• 7am to 6pm, Monday thru Friday
• 1 hour warm-up
• Interview Room Schedule Full Occupancy
• February March Spring Career Fair
• June, July August FTCAP
• October November Fall Career Fair

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Energy Analysis

• Existing System
• HVAC Electricity Usage 22.3 Annually
• Proposed System
• HVAC Electricity Usage 9.7 Annually
• With Interview Room Schedule
• HVAC Electricity Usage 11 Annually
• Without Interview Room Schedule
• Savings Primarily Due To
• Reduced Fan Energy
• One Central AHU
• FCU Fans Cycle

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Conclusion

• DOAS/FCU System VAV System Comparison
• Benefits
• Reduced amount of ductwork by 44 which saved
  Approximately 20,800
• Reduced Vertical Shaft Spaces
• Decreased Annual Electricity Usage by 50
• Improved Indoor Air Quality
• Outdoor Air closer to the Spaces
• Downsides
• Increased First Cost of Mechanical Equipment
• Especially Fan Coil Unit Cost compared to VAV
  boxes

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Thank You

• Professionals
• Mike Leakey, Architect
• Glenn Lelko, P.E.
• Scott Mack, P.E.
• Jack Rayman, Ph.D.
• Mark Wagner
• AE Faculty
• William Bahnfleth, Ph.D., P.E.
• Moses Ling, P.E.
• Stanley Mumma, Ph.D., P.E.
• AE Friends

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MBNA Career Services Center
Questions
Comments
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Mechanical

• Chilled Water Pump
• 345 GPM
• 18.4 ft H2O

General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
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Mechanical
General Information Existing Systems Mechanical El
ectrical Structural Proposed System Consideration
s Goals Mechanical Electrical Structural
Cost Analysis Energy Analysis Conclusion
Energy Recovery Unit