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This project outlines the mechanical redesign objectives for Greenbriar East Elementary School in Fairfax, Virginia. It covers the current mechanical system, the goals for the redesign, implementation details, improvements in daylighting, and key conclusions.
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Greenbriar East Elementary SchoolFairfax, Virginia Michelle L. SianoMechanical OptionSpring 2005 Senior Thesis
Presentation Outline • Project Background • Current Mechanical System • Redesign Objectives • Mechanical Redesign • Daylighting Redesign • Conclusions • Acknowledgements • Questions
Greenbriar East Elementary SchoolProject Background • Location: Fairfax, Virginia • Site: 10 acres surrounded by residential neighborhoods • Building Size: • 59,000 sq. ft. renovation • 14,000 sq. ft. addition • Total of 73,000 sq. ft. when complete • Dates of Construction: • December 2003 - January 2006 • Construction Cost: $6.8 million
Project Team • Owner • Fairfax County Public Schools • Architect/Engineers • Hayes, Seay, Mattern and Mattern (HSMM) • General Contractor • Caldwell and Santmyer, Inc. HSMM
Presentation Outline • Project Background • Current Mechanical System • Redesign Objectives • Mechanical Redesign • Daylighting Redesign • Conclusions • Acknowledgements • Questions
Current Mechanical System • Classrooms • Served by a Dedicated Outdoor Air System (DOAS) with a Parallel Unit Ventilator System • 5 100% OA units ranging in size from 1,480 to 2,460 cfm
Current Mechanical System • Non-classroom spaces • Constant Volume System • Served by 7 rooftop units ranging in size from 1,750 to 8,050 cfm • Rooftop units provide full ventilation, heating, and cooling RA Space OA SA RTU
Current Mechanical SystemEvaluation • ASHRAE Standard 62-2001 • Required – 26,910 cfm • Designed – 16,110 cfm
Presentation Outline • Project Background • Current Mechanical System • Redesign Objectives • Mechanical Redesign • Daylighting Redesign • Conclusions • Acknowledgements • Questions
Redesign Objectives • Meet ASHRAE Standard 62 • Removes indoor air pollutants from the space • Results in better health among the occupants • Provide humidity control • Minimizes the potential for bacterial growth • Mold can trigger asthma attacks • Asthma has risen 49% since 1982 • Use energy efficient equipment to lower operating costs
Presentation Outline • Project Background • Current Mechanical System • Redesign Objectives • Mechanical Redesign • Daylighting Redesign • Conclusions • Acknowledgements • Questions
Mechanical Redesign Dedicated Outdoor Air System • Provides ventilation air and meets some of the thermal loads • Benefits • always meet ventilation requirements due to a lack of mixing • reduces amount of ventilation air • reduces duct and equipment sizes
Mechanical RedesignDOAS Equipment • Energy Recovery Units by Semco • EPHC Model - Enthalpy Wheel plus full heating and cooling • 8 units needed of approx. 3000 cfm • $33,000 - $39,000
Mechanical RedesignDOAS Equipment • Reduction in Coil Sizes 29% Reduction in Cooling Coil 46% Reduction in Heating Coil
Mechanical RedesignParallel System • Geothermal Heat Pumps • Dependent on large amounts of water or ground • Utilizes the constant temperature of the ground • Results in highly efficient system Refrigerant Loop HP HP Ground Loop
Mechanical RedesignParallel System • Console Units for Classroom spaces • Allows for reuse of current piping for refrigerant loop • Horizontal Ceiling units for non-classroom spaces • Serve multiple spaces Heat Pump
Mechanical RedesignParallel System • Ground Loop • Sized for 55.4 tons of heating vs. 52 tons of cooling • Typical Soil – 200-300 ft/ton • Sized based on 250 ft/ton 13,573 ft of ground pipe • Cost of $750/ton $41,550 for piping and installation
Presentation Outline • Project Background • Current Mechanical System • Redesign Objectives • Mechanical Redesign • Daylighting Redesign • Conclusions • Acknowledgements • Questions
Daylighting Analysisfor Current Classroom • Average Illuminance • 2.94 fc • Maximum Illuminance • 41.8 fc • Minimum Illuminance • 0.3 fc
Classroom Redesign • Eight 2’ x 3’ windows at 5’ from finished floor
Daylighting Analysisfor Classroom Redesign • Average Illuminance • 12.86 fc • Maximum Illuminance • 33.5 fc • Minimum Illuminance • 0.7 fc
Presentation Outline • Project Background • Existing Conditions • Current Mechanical System • Redesign Objectives • Mechanical Redesign • Daylighting Redesign • Conclusions • Acknowledgements • Questions
Conclusions • DOAS • Reduced Ventilation Quantity by 33% • ERUs utilized enthalpy wheels to reduce heating and cooling loads • Geothermal Heat Pumps • Utilize the constant temperature of the ground for heating and cooling • Combination • Removes need for chiller • Saves $111,000 in energy use for chilled and hot water systems • Daylighting Redesign • Improved average illuminance to 12.86 fc
Presentation Outline • Project Background • Current Mechanical System • Redesign Objectives • Mechanical Redesign • Daylighting Redesign • Conclusions • Acknowledgements • Questions
Acknowledgements • AE Faculty and Staff • Dr. Freihaut • HSMM • Mike Kirkpatrick • Cortney Houghland • Fairfax County Public Schools • Dave Becker • My family, James, and friends
Presentation Outline • Project Background • Current Mechanical System • Redesign Objectives • Mechanical Redesign • Daylighting Redesign • Conclusions • Acknowledgements • Questions