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Kevin Angle April 17, 2003 Mechanical Option Faculty Consultant – Mr. Freihaut

ALLEGIS GROUP HEADQUARTERS. Kevin Angle April 17, 2003 Mechanical Option Faculty Consultant – Mr. Freihaut. Objectives. Existing Conditions Background Information Project Team Existing Mechanical System What does Geothermal mean to you? Surface Water Systems How do they work?

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Kevin Angle April 17, 2003 Mechanical Option Faculty Consultant – Mr. Freihaut

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  1. ALLEGIS GROUP HEADQUARTERS Kevin Angle April 17, 2003 Mechanical Option Faculty Consultant – Mr. Freihaut

  2. Objectives • Existing Conditions • Background Information • Project Team • Existing Mechanical System • What does Geothermal mean to you? • Surface Water Systems • How do they work? • Site Selection (Soil Analysis) • Pond Requirements • Design Conditions • Redesign of Allegis Group Headquarters • Cost Analysis • Recommendations / Conclusions Kevin Angle Mechanical Option - 2003

  3. Objectives • Existing Conditions • Background Information • Project Team • Existing Mechanical System • What does Geothermal mean to you? • Surface Water Systems • Redesign of Allegis Group Headquarters • Cost Analysis • Recommendations / Conclusions Kevin Angle Mechanical Option - 2003

  4. Existing Conditions • Building Location – Hanover, MD (Anne Arundel County) • Size – 3 Story Office Building • 107,000 square feet • Tenants • Allegis Group • Aerotek Kevin Angle Mechanical Option - 2003

  5. Building Features and Project Team • Features – “Vanilla” Building • 2 main wings – east and west wing Mechanical Option - 2003

  6. Objectives • Existing Conditions • Background Information • Project Team • Existing Mechanical System • What does Geothermal mean to you? • Surface Water Systems • Redesign of Allegis Group Headquarters • Cost Analysis • Recommendations / Conclusions Kevin Angle Mechanical Option - 2003

  7. Existing Mechanical System COOLING • 271 VAV Boxes • (6) Water Cooled Self-Contained AHU’s - (2) per floor - approx. 18,000 cfm each • 2 – 181 Ton Rooftop Cooling Towers HEATING • 2 Cast Iron Sectional Boilers in Penthouse • Perimeter Baseboard Heat w/ VAV Reheat Coils Kevin Angle Mechanical Option - 2003

  8. Objectives • Existing Conditions • Background Information • Project Team • Existing Mechanical System • What does Geothermal mean to you? • Surface Water Systems • Redesign of Allegis Group Headquarters • Cost Analysis • Recommendations / Conclusions Kevin Angle Mechanical Option - 2003

  9. What does Geothermal mean to you? • Mainly used in residential sector • Also referred to as ground-source heat pump (GSHP) • Utilizes the constant temperature of the earth to serve as heat sink/source • Extract heat or reject heat as needed • 3 types of systems - Ground Heat Exchanger GSHP - Groundwater GSHP - Surface-Water Closed Loop GSHP Kevin Angle Mechanical Option - 2003

  10. Objectives • Existing Conditions • Background Information • Project Team • Mechanical System • What does Geothermal mean to you? • Surface Water Systems • How do they work? • Site Selection (Soil Analysis) • Pond Requirements • Redesign of Allegis Group Headquarters • Cost Analysis • Recommendations / Conclusions Kevin Angle Mechanical Option - 2003

  11. Surface Water Systems How do they work? • Utilize coils or circuits inside ponds to act as heat exchanger • Headers connected to pumps inside building to distribute required amount of gpm to each heat pump • Heat pumps provide cooling/heating requirements for entire building loads Kevin Angle Mechanical Option - 2003

  12. Surface Water Systems Site Selection for Construction of a Pond • Soil Analysis Kevin Angle

  13. Surface Water Systems Construction of a Pond • Preparation of Site • Foundation of a Pond • Building a Core • Compaction • Planting Kevin Angle Mechanical Option - 2003

  14. Surface Water Systems Pond Requirements • Minimum of 10 feet depth requirement - eliminates chance of body of water becoming destratified - allows for drought seasons to not affect coils • Aesthetic Reasons • Storm Water Retention (Environmental Permits) Existing Pond Information from Landscape Architect • Existing Pond – 25 feet in depth → O.K • Area of Pond – impact on cooling load Approximate Dimensions (180 x 120 ) = 21600 sq. ft → O.K not ideal Kevin Angle Mechanical Option - 2003

  15. Objectives • Existing Conditions • Background Information • Project Team • Existing Mechanical System • What does Geothermal mean to you? • Surface Water Systems • How do they work? • Site Selection (Soil Analysis) • Pond Requirements • Redesign of Allegis Group Headquarters • Cost Analysis • Recommendations / Conclusions Kevin Angle Mechanical Option - 2003

  16. Redesign of Allegis Group Headquarters Building Layout • Zoning the building / Calculating the Loads = 159 Tons of Cooling Selection of Equipment Kevin Angle Mechanical Option - 2003

  17. Redesign of Allegis Group Headquarters Type of Pipe - High Density Polyethylene Pipe - resistance to corrosion - flexibility to withstand slight movement - fusion process between connections Use of Antifreeze – 20% Methanol - prevention of freezing - minimal harmful effects Calculation of antifreeze → 91 gallons Kevin Angle Mechanical Option - 2003

  18. Redesign of Allegis Group Headquarters Total of 16 runouts with 10 circuits per runout Coil Calculations / Layout Kevin Angle Mechanical Option - 2003

  19. Redesign of Allegis Group Headquarters Runout Sizing Anchoring Spools in Pond - Use of Concrete anchors - Propping 2 feet above pond floor - Submerged below surface 6-8 feet above floor Kevin Angle Mechanical Option - 2003

  20. Redesign of Allegis Group Headquarters Interior Piping / Heat Pump Layout – Reverse Return loop • Total of 32 Heat Pumps • - 6 core units • 26 perimeter units Kevin Angle Mechanical Option - 2003

  21. Redesign of Allegis Group Headquarters Pump Controls • Central pump system with variable frequency drives • Sensors placed along header piping • Constant differential pressure between exterior piping loop and interior piping loop to keep constant flow through each heat pump unit Kevin Angle Mechanical Option - 2003

  22. Redesign of Allegis Group Headquarters Ventilation Requirements • Use of existing Mechanical shaft to bring in 100% Outdoor Air • AHU’s ducted to each heat pump unit supply Outdoor Air • Mix Return Air from ceiling plenum to AHU Kevin Angle Mechanical Option - 2003

  23. Objectives • Existing Conditions • Background Information • Project Team • Existing Mechanical System • What does Geothermal mean to you? • Surface Water Systems • How do they work? • Site Selection (Soil Analysis) • Pond Requirements • Redesign of Allegis Group Headquarters • Cost Analysis • Recommendations / Conclusions Kevin Angle Mechanical Option - 2003

  24. Cost Analysis Kevin Angle Mechanical Option - 2003

  25. Cost Analysis **Typical Water Surface Heat Pump System costs $10-12 / sq. ft** **My system costs approximately $12.33 / sq. ft** Kevin Angle Mechanical Option - 2003

  26. Payback Period **Payback period came to between 4 and 5 years on operating and maintenance costs alone** Kevin Angle Mechanical Option - 2003

  27. Objectives • Existing Conditions • Background Information • Project Team • Existing Mechanical System • What does Geothermal mean to you? • Surface Water Systems • How do they work? • Site Selection (Soil Analysis) • Pond Requirements • Redesign of Allegis Group Headquarters • Cost Analysis • Recommendations / Conclusions Kevin Angle Mechanical Option - 2003

  28. Recommendations / Conclusions Advantages • Eliminate Cooling Towers / Boilers • Removal of Traditional VAV Boxes • More Mechanical Room space • Energy Efficiency – as much as 3X ordinary system • Payback Period of 4 to 5 years • Environmentally Safe and friendly – use of a natural resource • Flexibility – has been installed in various climates and applications Disadvantages • First Cost (Cost Construction of a Pond) • Downside of a “Vanilla” Building Kevin Angle Mechanical Option - 2003

  29. Recommendations / Conclusions Deciding Factor • Overall, Allegis Headquarters Pond not recommended as large enough in surface area for this amount of heating and cooling loads • However, Surface water systems due work in similar applications - needs to be developed in early design stages - coordination between designers/engineers essential - use of experienced GSHP contractor required to work Kevin Angle Mechanical Option - 2003

  30. Recommendations / Conclusions Water Furnace Headquarters Facility Kevin Angle Mechanical Option - 2003

  31. Acknowledgements • Faculty Consultant - Jim Freihaut • AE Professors and Faculty – Jonathan, Moses, Dr. Bahnfleth, Dr. Mumma • Sharon Williams – PSU AE doesn’t know how important she is • 5th year Senior Thesis Students – Tech for buying GSHP book • Roommates – Tim, Courtney, Courtney, Erin • My family – mother, sister, niece, aunts, uncles, and cousins • Burdette, Koehler, and Murphy – Mechanical Engineering Firm in Baltimore, MD • Andrew Endres, Sean MacCubbin, Dan Harlan – BKM • Eileen English – Colimore Clarke and Associates • Tom Rice – Daft, McCune, Walker, and Inc • Brian – Morabito Consultants • Kent Kuffner – Water Furnace products in Indiana In loving memory of my father, Marvin L. Angle, who passed away at the beginning of this semester on January 1, 2003. Kevin Angle Mechanical Option - 2003

  32. Questions Kevin Angle Mechanical Option - 2003

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