Freetown Elementary School Presentation Outline Project Background Size: 83,000 sq ft Project Background Location: Glen Burnie, MD Existing Mechanical Summary Construction Dates: March 2008 – May 2010 Re-design Objectives Delivery Method : Design Bid Build Cos t: $17 million Re-design Alternative Systems Ground Source Heat Pump Project Team Solar Panels Ventilation Sensors Owner : Anne Arundel County Public Schools Lighting Breadth Architect : Rubeling & Associates Structural Engineer : Columbia Engineering System Comparison Matthew Buda MEP Engineer : James Posey Associates Final Recommendations Construction Manager : Jacobs Engineering Group Mechanical Option Faculty Adviser: Dr. Treado April 12, 2011
Site Layout Presentation Outline Project Background Existing Mechanical Summary Re-design Objectives Re-design Alternative Systems Ground Source Heat Pump Solar Panels Ventilation Sensors Lighting Breadth System Comparison Old School New School Final Recommendations
Building Layout Presentation Outline First Floor Second Floor Project Background Classrooms Classrooms Existing Mechanical Summary Storage Administration Re-design Objectives Media/Computer Lab Re-design Alternative Systems Extended Daycare Ground Source Heat Pump Cafeteria/Kitchen/Gym Solar Panels Mechanical Room Ventilation Sensors Storage Lighting Breadth System Comparison Final Recommendations
Existing Mechanical Systems Air Handling Units Mechanical Room Constant Volume – Rooftop Air Handling Unit 2 pipe changeover system AHU-1 : General Music Classroom AHU-2 : Instrumental Music Classroom AHU-3 : Cafeteria Two Natural Gas Boilers rotated monthly AHU-4A : Gymnasium AHU-6: Media Center Domestic Water Heater Variable Volume/ Variable Temperature - Rooftop Air Handling Unit Air Cooled Chiller AHU-5 : Administration Air Source Heat Pump HPU-1A – Extended Daycare ERU-1 Energy Recovery Units – Rooftop Air Handling Units with Fan Coil Units ERU-1 : Classrooms ERU-2 : Classrooms
Existing Mechanical Systems Air Handling Units Mechanical Room Constant Volume – Rooftop Air Handling Unit Modeled in TRACE 2 pipe changeover system AHU-1 : General Music Classroom AHU-2 : Instrumental Music Classroom Annual Energy Consumption AHU-3 : Cafeteria Two Natural Gas Boilers rotated monthly AHU-4A : Gymnasium Electric : 2,529,487 kWh AHU-6: Media Center Domestic Water Heater Variable Volume/ Variable Temperature - Rooftop Air Handling Unit Gas : 1,222 therms Air Cooled Chiller AHU-5 : Administration Building : 114,845 BTU/(ft 2 -year) Air Source Heat Pump HPU-1A – Extended Daycare Lighting 52% of Total Building Energy Energy Recovery Units – Rooftop Air Handling Units with Fan Coil Units Primary Cooling 22% of Total Building Energy ERU-1 : Classrooms ERU-2 : Classrooms
Re-design Objectives Presentation Outline Re-design Alternative Systems Project Background Selected Depth Systems Reduce energy consumption Existing Mechanical Summary Ground Source Heat Pump Re-design Objectives Reduce emissions Re-design Alternative Systems Solar Panels Maintain a comfortable environment Ground Source Heat Pump Ventilation Sensors Solar Panels Be more sustainable Ventilation Sensors Breadths Lighting Breadth System Comparison Occupancy Sensors with Daylighting Final Recommendations Rainwater collection system
Ground Source Heat Pump Presentation Outline Layout Selection Project Background Existing Mechanical Summary Vertical Closed Loop Peak Cooling Load > Peak Heating Load Re-design Objectives 231 tons Re-design Alternative Systems Ground Source Heat Pump Layout Solar Panels 2 tons per 300ft = 116 bores Ventilation Sensors 20 ft spacing between bores Lighting Breadth System Comparison Final Recommendations Bore Detail
Ground Source Heat Pump Modeled in TRACE Annual Energy Consumption Electric : 2,294,989 kWh Gas : 0 therms Building : 103,100 BTU/(ft 2 -year)
Ground Source Heat Pump Presentation Outline Project Background Payback Emissions Existing Mechanical Summary Re-design Objectives Re-design Alternative Systems Ground Source Heat Pump Solar Panels Ventilation Sensors Lighting Breadth System Comparison Final Recommendations
Solar Panels Presentation Outline Analysis Project Background 100% of Space Heating and Domestic Hot Water Existing Mechanical Summary Re-design Objectives Compare to 1,222 therms of Natural Gas Re-design Alternative Systems Peak in January : 265,250 BTU/hr Ground Source Heat Pump Solar Panels UA = qhl / (Tbp-Tout) Ventilation Sensors Lighting Breadth Tbp =65 deg F Tout = 27 deg F System Comparison Final Recommendations UA = 3267W/K Modeled in Combisys: TRNSED
Solar Panels Presentation Outline Project Background Comparison Footprint and Cost Existing Mechanical Summary Re-design Objectives Re-design Alternative Systems Ground Source Heat Pump Solar Panels Ventilation Sensors Lighting Breadth System Comparison Final Recommendations
Solar Panels Presentation Outline Analysis Project Background Existing Mechanical Summary 100% Domestic Hot Water Re-design Objectives Re-design Alternative Systems Ground Source Heat Pump Used year round Solar Panels Ventilation Sensors Lighting Breadth System Comparison Final Recommendations
Ventilation Sensors Presentation Outline Project Background Existing Mechanical Summary Volatile Organic Compounds (VOC) VOC Ranges Source: BAPI Re-design Objectives Humans – breath, cosmetics – acetone/ethanol/CO2 Re-design Alternative Systems Ground Source Heat Pump Office Equipment – printers, computers – benzene, styrene Solar Panels Ventilation Sensors Building materials – paints, carpets – formaldehyde, ketones Lighting Breadth System Comparison Final Recommendations
Ventilation Sensors Presentation Outline Source: BAPI Project Background Slightly lower because students not wearing cologne, perfume and Existing Mechanical Summary lotions Re-design Objectives Re-design Alternative Systems IEQ output direct indication of occupancy Ground Source Heat Pump Solar Panels Ventilation Sensors Lighting Breadth System Comparison Final Recommendations Study of a 6,000 cubic foot elementary classroom 1 teacher and 30 students
Lighting Breadth Presentation Outline Typical Classroom Control Occupancy Sensors with Daylighting controls Project Background Existing Mechanical Summary Automatic switching Infrared Re-design Objectives Manual switching Ultrasonic Re-design Alternative Systems Dimming ballast for daylighting Dual Technology/Hybrid Dimming of different zones Ground Source Heat Pump Solar Panels Sensor Ventilation Sensors Lighting Breadth LC-100 Power Pack DT-200 Dual Tech. Occ. Sensor System Comparison LS-201 Dimming Photosensor Final Recommendations
Lighting Breadth Presentation Outline Occupancy Sensors with Daylighting controls Project Background Source: WattStopper Lighting Against Windows Existing Mechanical Summary 2-lamp dimming ballast Infrared Re-design Objectives Tandem wiring Ultrasonic Re-design Alternative Systems Dual Technology/Hybrid DT-200 Ground Source Heat Pump 18 minute time delay Solar Panels Ventilation Sensors LS-201 Lighting Breadth Mount between 5 and 8 feet from window System Comparison Final Recommendations
Lighting Breadth Presentation Outline Modeled in TRACE as Standard Stepped Controller Project Background Simple Payback Existing Mechanical Summary Compared to the as-designed lighting controls 6 months Re-design Objectives Re-design Alternative Systems Savings Ground Source Heat Pump Effect 5% energy reduction Solar Panels $14,029 a year in utilities Energy reduction from controls Ventilation Sensors Lighting Breadth Total First Cost $7,463 Increase in energy use for heating with decrease in lighting load System Comparison 37 Sensors - $5,644 Labor - $1,819 Final Recommendations
System Comparison Solar Panels Ground Source Heat Pump Ventilation Sensors Advantages Advantages Advantages 13% total energy savings 35% Energy Savings on heating Quick payback Relatively quick payback Disadvantages Better air quality Very expensive Disadvantages Disadvantages Schedule Long Payback Extra cost Weather during construction
Final Recommendations Presentation Outline Project Background Ground Source Heat Pump Existing Mechanical Summary Reasonable Payback at 6.2 years Re-design Objectives Re-design Alternative Systems Ventilation Sensors Ground Source Heat Pump Solar Panels Better indoor air quality increase in productivity Ventilation Sensors Lighting Breadth Lighting Occupancy Sensors System Comparison Final Recommendations Daylighting
Thank you Dr. Treado, Adviser Siman Sinai, Jacobs Matt Tressler, McClure Fellow Students
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