DISTRICT WIDE STRATEGIES FOR ENERGY EFFICIENT SCHOOLS

Transcription

1 DISTRICT WIDE STRATEGIES FOR ENERGY EFFICIENT SCHOOLS 190

2 WHY DESIGN EFFICIENT SCHOOLS? Code Compliance International Building Code International Energy Conservation Code ASHRAE 90.1 Operational Savings Costs to run and maintain schools Stewards of communities tax dollars Maximize the availability of M and O Funds 191

3 Lighting strategies LIGHTING STRATEGIES 192

4 LIGHTING STRATEGIES 98% of classrooms have exterior windows Inboard/outboard switching at classrooms Occupancy sensors in all spaces Natural light in all spaces where possible 193

5 LIGHTING STRATEGIES High Bay Metal Halide replaced with T5 high output fluorescent fixtures Exterior metal halide replaced with induction lighting ½ energy use of metal halide fixture 100,000 hour bulbs = Reduced maintenance costs 194

6 Light bulb replacement LIGHT BULB REPLACEMENT 195

7 FLUORESCENT FIXTURES 20 years ago T12 lamps replaced with 32 watt T8 lamps 2 years ago 32 watt T8 replaced with 25 watt T8 lamps Over 200,000 bulbs have been changed out in district Program initial cost of $840,000 Electrical provider rebates of $340,000 Projected savings = $147,514 per year Actual savings = $450,000 in first year 196

8 Spray polyurethane foam insulation SPRAY POLYURETHANE FOAM INSULATION 197

9 EXTERIOR WALL INSULATION Exterior wall insulation, air barrier materials First used in Frisco ISD schools in 2001 Used in all Frisco ISD schools until 2013 Provides a Higher R value of exterior walls than conventional batt insulation Also provides air barrier to wall assembly 198

10 Geothermal hvac GEOTHERMAL HVAC 199

11 GEOTHERMAL HVAC Started in district in 2003 Heat and cool through utilization of natural resources of earth Over 50 district facilities currently utilize this system Over 18,162 wells in district currently Over 860 miles of vertical piping 200

12 GEOTHERMAL HVAC BENEFITS Typical Maintenance costs Compressors WSHP Compressor $850 Chiller Compressor $10,000 Water treatment Geothermal Loop $0.00 Central Plant $6,500 Water pump Geothermal $560 Central Plant $4,000 - $6,000 Equipment lasts longer not on roof 201

13 GEOTHERMAL HVAC OPERATION COSTS 202

14 GEOTHERMAL HVAC OPERATION COSTS 34% SAVINGS ELEMENTARY SCHOOLS:

15 GEOTHERMAL HVAC OPERATION COSTS 46% SAVINGS MIDDLE SCHOOLS:

16 GEOTHERMAL HVAC OPERATION COSTS 38% SAVINGS HIGH SCHOOLS:

17 Geothermal hvac ENERGY MANAGEMENT SYSTEMS 206

18 SYSTEMS OPERATIONAL CONTROL Operations control and monitoring at district wide level in central location 207

19 SYSTEMS OPERATIONAL CONTROL Operations control and monitoring at district wide level in central location 208

20 SYSTEMS OPERATIONAL CONTROL Operations control and monitoring at district wide level in central location 209

21 Geothermal hvac IRRIGATION CONTROLS MANAGEMENT 210

22 WATER SYSTEMS MANAGEMENT Central programming ability at district wide level Preset flow monitors If flow exceeded system shuts down for maintenance Weather station monitors conditions based on ET Evaporative Transpiration Technology Utilizing city of Frisco Gray water where available 211

23 Geothermal hvac IECC

24 DAYLIGHT HARVESTING Photo sensors detect daylight levels and automatically adjust the output level of electric lighting to create even illumination across the room. Required in defined daylight zones (areas expected to receive high, consistent daylight levels) 213

25 OCCUPANCY SENSORS Specifically required in a series of spaces, including classrooms, conference/meeting rooms, private offices, restrooms, storage rooms, custodial closets, etc. The sensor must turn the lights OFF within 30 minutes of vacancy and provide manual-on or auto-on-to-<50% operation. 214

26 COMMISSIONING Third party commissioning agent is required to test the system to make sure it works as it was designed. 215

27 Geothermal hvac LED LIGHTING 216

28 TREND Price is decreasing by 20% a year. Lighting output is increasing by 35% a year That means the price and performance is doubling about every months!

29 BENEFITS Energy efficient Directional Long life Infinitely dimmable No Mercury, UV or IR Rugged Instant on Works well in cold temperatures 218

30 UNIFORMITY HID Application LED Application 219

31 Geothermal hvac ROOFING SYSTEMS 220

32 ENERGY STAR ROOF First used in Frisco ISD in 2008 All schools since 2008 have this roof assembly Roof assembly provides R-30 roof insulation Roofing membrane reflects instead of absorbing heat 221

33 ENERGY STAR ROOF In combination with Geothermal HVAC Limited penetrations in roofing material Less equipment on roof Less traffic on roof Reflective material allows for less solar impact Longer material life 222

34 Geothermal hvac INSULATED CONCRETE FORMS 223

35 EXTERIOR WALL CONSTRUCTION Started in 2012 Current schools with this construction Independence High School Scott and Newman Elementary Schools Insulation provides forms Pour in place concrete walls R20+ thermal mass 224

36 EXTERIOR WALL CONSTRUCTION No additional weather barrier required Future Tornado Sheltering Technology Required by 2015 International Building Codes Efficient Building Operation 225

37 Geothermal hvac RESULTS 226

38 BENCHMARKING HIGH SCHOOLS 72 KBTU 50 KBTU 50 KBTU Climate ASHRAEZone Average School ASHRAE Compliant School Centennial High School EUI = Energy Use Intensity (kbtu per Square Foot per Year) 48 KBTU Frisco High School 35 KBTU Liberty High School 34 KBTU Wakeland High School 33 KBTU Lone Star High School 32 KBTU Heritage High School 55% Better! 227

39 BENCHMARKING ELEMENTARY SCHOOLS 72 KBTU 50 KBTU 44 KBTU Climate ASHRAEZone Average School ASHRAE Compliant School Christie Elem School 41 KBTU Borchardt Elem School EUI = Energy Use Intensity (kbtu per Square Foot per Year) 33 KBTU Bright Elem School 28 KBTU 22 KBTU Fisher Elem School Ashley Elem School 21 KBTU Riddle Elem School 20 KBTU Riddle Pink Elem Elem School 18 KBTU Riddle Purefoy Elem School 17 KBTU Elliott Riddle Elem School 16 KBTU Phillips Riddle Elem School 77% Better! 228

40 ENERGY STAR RATED SCHOOLS Elementary Schools 31 Total All Facilities 54 Total 94% CENTRAL PLANT GEOTHERMAL 87% CENTRAL PLANT GEOTHERMAL 6% 13% AVERAGE SCORE: AVERAGE SCORE: 91

41 GUIDELINES FOR EFFICIENT DESIGN LEED- Leadership in Energy Efficient Design Tx-CHPS Collaborative for High Performance Schools For last ten years Over 35 schools have been designed with LEED/ CHPS criteria 230

42 Geothermal hvac FUTURE CONSIDERATIONS 231

43 ENVIRONMENTAL CONSIDERATIONS Native Landscaping Solar Collection and Power Generation Rainwater Harvesting Water Wells Wind Power Generation Green Roofs 232