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Modern Building: Green Library

Modern Building: Green Library. Eric Strafelda Tyler Mitchell Jordan Timmersman. NDSU Modern Building. 300,000 sqft (3x the size of the current library) Site location: East of Memorial Union 6 floors Two roof areas that allow for solar panel Allows for sunlight to be utilized fully.

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Modern Building: Green Library

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  1. Modern Building: Green Library Eric Strafelda Tyler Mitchell Jordan Timmersman

  2. NDSU Modern Building • 300,000 sqft (3x the size of the current library) • Site location: East of Memorial Union • 6 floors • Two roof areas that allow for solar panel • Allows for sunlight to be utilized fully

  3. Requirements • Electrical Engineering Design – Blue Prints • Electrical Engineering Specifications • Electrical Engineering Studies • Solar Roof Study

  4. Meeting with Architect • We met with the architect and got the AutoCAD drawings form him. • He wanted the building to be as green as possible • Wanted us to design for the following: • Efficiency • Cost • Light Quality

  5. Meeting with NDSU Facilities • We talked with Brent Dekrey about seeing what the current library has in it. • Library is provided heat from steam plant • Has a 1200A service • Needed to have chillers and air handling units in our calculation for new library. • Roughly 100,000 sqft • Has a 100 kW backup generator

  6. Service Sizing Calculations • Receptacle Loading: All loading is unknown for our building so we assumed a 1 VA per square foot • 1VA*1VA*300,000sqft = 300,000VA • General Lighting: All lighting is unknown for our building so we assumed a 3.5 VA per square foot • 3.5 VA was found in code book Sec. 220.12 • 3.5VA*300,000sqft = 1,050,000VA

  7. Service Sizing Calculations • Lighting Demand Factor: Most of your lighting loads are considered to be a continuous load • 25%*General Lighting Load = 262,500 VA

  8. Service Sizing Calculations • Motor/Mechanical Loads • 1 CFM per sqft and 340 sqft per ton of coolant • With 300,000 sqft over 6 floors that is 50,00 sqft per floor. With 1000 ton chiller. • 1000 ton chiller = 3500 kW • (6) 50,000 Air Handling Units (AHU) • 2 motors rated at 75 hp motors • 6 150 hp motors for AHU’s

  9. Service Sizing Calculations • Combining Motor/Mechanical Loads • According to NEC section 440.7 you use 125% of your highest rated motor and then face value for all other loads. • 150 hp X 746 W/hpX125%=140,000 W • 5 X 150 hp X 746 W/hp=560,000 W • 3500 kW for the chiller • Total Motor Load of 700 kW

  10. Service Sizing Calculations • Combing all the numbers previously found. • Total VA=2,312,500 • VA=V*I*1.73 • V=480V • A=2,786.14 • Using NEC section 240.6 We selected a service size of 3000 Amps

  11. PV Economic Study • One of our major objectives in this project was to be able to work with an outside client such as an architect. • Our client asked us to provide an economic study to see if installing a photovoltaic array would be a wise investment.

  12. PV Payback Analysis

  13. PV Fringe Benefits • Some Fringe Benefits that are not related to direct energy cost analysis include: • Educational • Thermal • Demand Savings • Power Quality • Utility Buyback • Environmental • Public Perception

  14. PV Analysis Conclusion • Given the warranty/useful life a PV array is 20 years. The 13.32 payback period is very favorable • Including the 3.61 return on investment along with all fringe benefits. • We would recommend the inclusion of a PV array atop our modern building

  15. Project Status • We have successfully completed the deliverables for the first semester. • We had to do a little rearranging of our schedule and an updated timeline is on the following slide.

  16. Timeline

  17. Budget

  18. Summary • Using the NEC code book and information gathered from campus administrators we were able to select a service size of 3000A • Using engineering economic analysis we were able to accurately predict the cost of a PV Array installation and recommend its inclusion. • We are still on track to deliver our completed project next semester.

  19. Questions?

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