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MBNA Career Services Center

The Pennsylvania State University University Park Campus. MBNA Career Services Center. Overview. MBNA Career Services Center. General Information Existing System Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural

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MBNA Career Services Center

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  1. The Pennsylvania State University University Park Campus MBNA Career Services Center

  2. Overview MBNA Career Services Center • General Information • Existing System • Mechanical • Electrical • Structural • Proposed System • Considerations • Goals • Mechanical • Electrical • Structural • Cost Analysis • Energy Analysis • Conclusion

  3. General Information MBNA Career Services Center

  4. Background • Home of Penn State’s 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion Picture taken from PSU Office of Physical Plant Website

  5. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  6. Existing Systems MBNA Career Services Center

  7. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  8. Mechanical • Water Side • Cooling • Chilled water available from Computer Building • Total Cooling Load – 133 tons • 45°F Chilled Water • Heating • Steam from Penn State’s campus distribution system • Heat exchanger – steam to hot water • 180°F Hot Water General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  9. Electrical • Main Service • 208Y/120V-3P-4W, 1200A Main Distribution Panel • Emergency Power • 208Y/120V-1P-3W, 100A Panel General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  10. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  11. Proposed System MBNA Career Services Center

  12. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion SA Shaft (Proposed System) RA Shaft (Proposed System)

  13. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  14. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion Dedicated Outdoor Air with Fan Coil Units Proposed System

  15. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  16. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  17. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  18. Mechanical • Scheduling/Controls • Nighttime • Energy Recovery Unit – off • Fan Coil Units • Maintain Setback Temperature – Winter Only General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  19. Electrical • Motor Circuit & Feeder Sizing • Wire Sizing (NEC Section 430-22) • [(FLA of largest motor*125%)+(FLA sum of all other motors)] • Typ. Wire Size = #12THW • Time Delay Circuit Breaker (NEC Section 430-152) • [(FLA of largest motor*250%)+(FLA sum of all other motors)] = minimum required breaker rating • Typ. Breaker Size = 20A General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  20. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  21. Structural • Extend Supply Duct to 3rd Floor • Create vertical shaft near elevator General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion SA Duct

  22. Structural • Extend Return Duct to 3rd Floor • Impossible to go straight up through Floor • Travel under Floor between Joists General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion Stairs Joists RA Duct Copy

  23. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  24. Cost Analysis • Ductwork Comparison General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion • New System uses 44% less Ductwork by Weight

  25. Cost Analysis • Mechanical System Area Comparison General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  26. Cost Analysis • Existing System – Items Eliminated • Mechanical Equipment cost from TRANE General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  27. Cost Analysis • Proposed System – Items Added General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion • ~$10,800 Additional Cost for Proposed System

  28. Energy Analysis • Using Carrier’s Hourly Analysis Program • Simulate Existing System & Proposed System • $0.023 per kWh (PSU’s 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  29. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  30. 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 Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  31. 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 Thank You

  32. MBNA Career Services Center Questions Comments

  33. Mechanical • Chilled Water Pump • 345 GPM • 18.4 ft H2O General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion

  34. Mechanical General Information Existing Systems Mechanical Electrical Structural Proposed System Considerations Goals Mechanical Electrical Structural Cost Analysis Energy Analysis Conclusion Energy Recovery Unit

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