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The Edward St. John Student Center

The Edward St. John Student Center. Zachary Haupt Faculty Advisor: Dr. William Bahnfleth 11 April 2011. Presentation Outline. Project Background Existing Mechanical Summary Design Objectives Alternative Descriptions Ground Source Heat Pumps Enthalpy Wheel Solarban 70XL Glass

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The Edward St. John Student Center

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  1. The Edward St. John Student Center Zachary Haupt Faculty Advisor: Dr. William Bahnfleth 11 April 2011

  2. Presentation Outline • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Solarban 70XL Glass • System Comparison • Final Recommendations

  3. Presentation Outline Project Information: Delivery Method - Design-Bid-Build Operational Date - September 2012 Occupancy - K-12 Boarding School Size - 68,000 SF Cost - $16,000,000 • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Solarban 70XL Glass • System Comparison • Final Recommendations Primary Project Team: Owner - McDonogh School Architect - Bowie Gridley Architects Civil Engineer - Matis Warfield MEP Engineer - James Posey Associates, Inc Structural Engineer - Linton Engineers, LLC

  4. Presentation Outline • Mechanical System: • 8 indoor AHUs • 7 VAV units • 5 single zone VAV units • 2 multizone VAV units • 1 single zone CAV unit • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Solarban 70XL Glass • System Comparison • Final Recommendations • Central Plant: • Located on campus • 3 Boilers • 2 Chillers Student Center

  5. Building Layout • Lower Level • AHU – 3 Serves Lecture Hall • AHU – 4 Serves Dance Studio • AHU – 5 Serves LS Dining • AHU – 1 Serves Lower & Quad Levels AHU – 3 AHU – 4 AHU – 1 AHU – 5

  6. Building Layout • Quad Level • AHU 6 & 7 Serve US Dining • AHU – 2 Serves Senior Dining • AHU – 1 Serves Lower & Quad Levels AHU – 1 AHU – 6 & 7 AHU – 2

  7. Building Layout • Upper Level • AHU – 8 Serves Entire Floor AHU – 8

  8. Presentation Outline • Improve System Performance • Energy Consumption • Emissions • Total System Costs • Minimize Payback Periods • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Solarban 70XL Glass • System Comparison • Final Recommendations

  9. Presentation Outline Solarban 70XL Ground Source Heat Pumps Enthalpy Wheel Solarban 70XL Ground Source Heat Pumps Enthalpy Wheel • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Solarban 70XL Glass • System Comparison • Final Recommendations The Bad The Bad The Bad The Good The Good The Good • Increased Construction Costs • Increased Construction Time • Impact of Loop on Ecosystem • Increased Construction Costs • Increased Size and Weight to AHU • Increased Capital Costs • Slight Decrease to Daylighting • Higher System Efficiencies • Lower Greenhouse Gas Emissions • Low Maintenance • Low Air Pressure Drop • Higher System Efficiencies • Decentralized System • Lower Greenhouse Gas Emissions • Provides Lower Heat Gain • No Added Maintenance • Large Array of Shading Choices

  10. Presentation Outline Implementing a GSHP • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Solarban 70XL Glass • System Comparison • Final Recommendations • Site Geology Study • Calculations • Pipe Sizing • Pump & System Layout • Results

  11. Located in Baltimore County Implementing a GSHP • Precambrian Soil Type • 15% Water and Sandstone • Soil Resistivity ≈ 0.6 BTU/hr· ft· °F • Site Geology Study • Calculations • Pipe Sizing • Pump & System Layout • Results

  12. McClure Company Spreadsheet & ASHRAE Implementing a GSHP ASHRAE Loop Sizing • Vertical Loop Analysis • Used to Determine # of Bores + Depths • Cross Checked With ASHRAE • Site Geology Study • Calculations • Pipe Sizing • Pump & System Layout • Results

  13. Bores Per Pump Implementing a GSHP Selected Pump Model • 750 Total GPM – 125 Total Bores • 6 GPM Per Bore • Site Geology Study • Calculations • Pipe Sizing • Pump & System Layout • Results Cost Of Pipe

  14. Layout of System Implementing a GSHP • 5 Pumps • Each Pump Serves 12 Bores • 5 Pumps • Each Pump Serves 13 Bores • Site Geology Study • Calculations • Pipe Sizing • Pump & System Layout • Results

  15. Energy Savings Annual Energy Consumption (Existing vs. GSHP) Implementing a GSHP • 5.7 % Annual Heating Savings • 12.4 % Annual Cooling Savings • 9.9 % Total Annual Energy Savings • Site Geology Study • Calculations • Pipe Sizing • Pump & System Layout • Results

  16. Presentation Outline Selecting a Wheel • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Solarban 70XL Glass • System Comparison • Final Recommendations • Determine supply air total flow (CFM) • Use SEMCO wheel chart • Keep face velocity ≈ 800 (FPM) • Calculate unit effectiveness • Results

  17. AHU - 8 Selecting a Wheel • Serves art classrooms • Scheduled at 15,000 CFM • Determine supply air total flow (CFM) • Use SEMCO wheel chart • Keep face velocity ≈ 800 (FPM) • Calculate unit effectiveness • Results

  18. AHU - 8 Selecting a Wheel • Find desired CFM • Read directly right until model intersection (closest to 800 FPM) • Mark model # down • Read directly down to find associated pressure loss • Determine supply air total flow (CFM) • Use SEMCO wheel chart • Keep face velocity ≈ 800 (FPM) • Calculate unit effectiveness • Results

  19. AHU - 8 Selecting a Wheel • Use calculations to determine unit effectiveness • ≈ 80% Good • Determine supply air total flow (CFM) • Use SEMCO wheel chart • Keep face velocity ≈ 800 (FPM) • Calculate unit effectiveness • Results

  20. Energy Savings Selecting a Wheel Annual Energy Consumption (Existing vs. Wheel) • 17.0 % Annual Heating Savings • 3.4 % Annual Cooling Savings • 8.4 % Total Annual Energy Savings • Determine supply air total flow (CFM) • Use SEMCO wheel chart • Keep face velocity ≈ 800 (FPM) • Calculate unit effectiveness • Results

  21. Presentation Outline Structural Check • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Structural Breadth • Solarban 70XL Glass • System Comparison • Final Recommendations • Calculate lb/ft2for each AHU • Calculate new lb/ft2 for AHU 8 • Check slab strength • Adjust accordingly • Check beam strength • Adjust accordingly

  22. Calculations Structural Check • Locate AHU Schedule • Mark Weight, Width, & Length of each AHU Located in Room • Calculate lb/ft2 of Each AHU • Calculate lb/ft2for each AHU • Calculate new lb/ft2 for AHU 8 • Check slab strength • Adjust accordingly • Check beam strength • Adjust accordingly

  23. Calculations Structural Check • AHU 6 Dropped • Wheel Adds • 2’ in Length • 1,300 lbs • Calculate lb/ft2for each AHU • Calculate new lb/ft2 for AHU 8 • Check slab strength • Adjust accordingly • Check beam strength • Adjust accordingly

  24. Calculations Structural Check • Rebar Spaced Every 14” O.C. • Slab Fails Under New Load • Space Rebar Every 12” O.C. • Recheck Slab • Calculate lb/ft2for each AHU • Calculate new lb/ft2 for AHU 8 • Check slab strength • Adjust accordingly • Check beam strength • Adjust accordingly

  25. Calculations Structural Check • Slab Does Not Fail • Adjust Rebar Spacing • Analyze Beam • Calculate lb/ft2for each AHU • Calculate new lb/ft2 for AHU 8 • Check slab strength • Adjust accordingly • Check beam strength • Adjust accordingly

  26. Calculations Structural Check • Beam Analyzed in spBeam • Sized Beam Cross Checked With Scheduled Beam • Scheduled Beam Well Oversized • Beam Holds New Load • Calculate lb/ft2for each AHU • Calculate new lb/ft2 for AHU 8 • Check slab strength • Adjust accordingly • Check beam strength • Adjust accordingly • Adjust accordingly

  27. Presentation Outline Installing Solarban 70XL Glass • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Solarban 70XL Glass • System Comparison • Final Recommendations • Calculate Total Amount of Glazing • Calculate Cost of Glazing • Analyze Glazing Properties • Results

  28. Total Glazing • Review Architectural Drawings Installing Solarban 70XL Glass • Calculate Total Amount of Glazing • Calculate Cost of Glazing • Analyze Glazing Properties • Results

  29. Cost • Multiply Glass SF By $/SF • Analyze 3 Types of Glass Installing Solarban 70XL Glass • Calculate Total Amount of Glazing • Calculate Cost of Glazing • Analyze Glazing Properties • Results

  30. Performance • Installed Values Obtained From Drawings • Upgraded Values Obtained From PPG Industries Installing Solarban 70XL Glass • Calculate Total Amount of Glazing • Calculate Cost of Glazing • Analyze Glazing Properties • Results

  31. Energy Savings Installing Solarban 70XL Glass • 6.6 % Annual Heating Savings • 16.7 % Annual Cooling Savings • 13 % Total Annual Energy Savings • Calculate Total Amount of Glazing • Calculate Cost of Glazing • Analyze Glazing Properties • Results

  32. Presentation Outline • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Solarban 70XL Glass • System Comparison • Final Recommendations 3 Year Payback Period 2.5 Year Payback Period 12 Year Payback Period 12.5 Year Payback Period 2.5 Year Payback Period

  33. Presentation Outline Final Recommendations • Project Background • Existing Mechanical Summary • Design Objectives • Alternative Descriptions • Ground Source Heat Pumps • Enthalpy Wheel • Solarban 70XL Glass • System Comparison • Final Recommendations • Maximize Distance Between Cost & Payback Period • Analyze Owner’s Intentions • Make Suggestion

  34. Special Thanks To: Questions Or Comments • Justin Bem • Dr. Bahnfleth • Penn State AE Mechanical Faculty • Family & Friends

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