1. Frisco ISD Geothermal Buildings
Energy Efficient Buildings Using The Earth’s Natural Heat and Cooling Storage
TEMA Meeting
January 12, 2017

2. REASONS FOR DESIGING Geothermal BUILDINGS
Code Compliance
ASHRAE 90.1
International Building Code
International Energy Conservation Code
Voluntary Certifications
TX-CHPS
LEED
Energy Star
Cost Savings
Operational Costs

3. Frisco ISD Profile
Fastest growing school district in the state and nation for the past 20 years on a percentage basis.
Enrollment increased by from 7% to 10% per year. (3,000+ Students)
Down this year to 2,243 new students.
Current enrollment is over 55,000 and is projected to be 62,000 by 2020.
Frisco ISD is committed to smaller schools to promote family involvement and high levels of academic achievement. FISD’s mission is to know every student by name and need. This results in more schools.
Frisco ISD is currently building a high school, a middle school and two elementary schools that will be added to our 81 existing buildings.
All buildings and additions built since 2003 (60) are geothermal. Two buildings have RTUs and 19 are central plant with air cooled chillers and boilers.

4. Geothermal Water Source Heat Pumps
Employs a heat exchanger in contact with the ground to extract or dissipate heat.
The heat exchanger is a series of “wells” drilled to a depth of 250 feet that circulate water through the earth.
Well fields replace boilers and chillers in a central plant system or condensers in a split system. High pressure polyethylene pipe (HPPE) replaces cast iron pipe.
WSHPs replace fan coil units or VAV boxes in ceilings of the building.
Estimated savings is 30% - 40% in energy costs over a central plant system.

5. Geothermal Water Source Heat Pumps
Geothermal vertical well being drilled. Frisco ISD has 25,896 wells!
At a depth of 250 feet, that is 6,474,000 vertical feet of pipe or 1,226 miles!! That is enough pipe to stretch from Frisco to the Canadian border!

6. Geothermal Water Source Heat Pumps

7. Geothermal Water Source Heat Pumps

8. Geothermal Water Source Heat Pumps Inside the building

9. Geothermal Water Source Heat Pumps Inside the building

10. Geothermal Well Locations

11. 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 to 6,000
Equipment Lasts Longer-
Not on the roof

12. Geothermal Systems Operational Control
Operations are controlled and monitored at a district wide level in a central location.

13. Geothermal Systems Operational Control
Scheduling overrides and monitoring can be done on individual rooms.

14. Utility Cost 2014/2015 2015/2016 School Years

15. High School Efficiency KBTU/Sq. Ft. 2015 / 2016 School Year

16. High School Efficiency KBTU/Sq. Ft. 2015 / 2016 School Year
Building
Use
Prorated Area
Use/ft2
Centennial High School
16,860, KBTU
375431
44.683
Frisco High School
14,226, KBTU
352978
40.304
Career and Technology Ed. Center
6,139, KBTU
175125
35.058
Wakeland HS
11,600, KBTU
345646
33.560
Liberty High School
11,302, KBTU
348496
32.431
Heritage High School
11,300, KBTU
356738
31.677
Lone Star High School
10,744, KBTU
350236
30.678
Independence High School
10,148, KBTU
345969
29.332
Reedy High School
9,336, KBTU
352124
26.515
38% Savings

17. Middle School Efficiency KBTU/Sq. Ft. 2015 / 2016 School Year

18. Middle School Efficiency KBTU/Sq. Ft. 2015 / 2016 School Year
Building
Use
Prorated Area
Use/ft2
Clark Middle School
7,365, KBTU
133318
55.249
Pioneer Heritage Middle School
7,509, KBTU
138306
54.295
Wester Middle School
6,594, KBTU
47.681
Staley Middle School
5,733, KBTU
128330
44.681
Fowler Middle School
4,731, KBTU
138650
34.129
Roach Middle School
4,487, KBTU
138651
32.365
Scoggins Middle School
4,561, KBTU
142108
32.098
Griffin Middle School
4,432, KBTU
138428
32.017
Stafford Middle School
4,316, KBTU
30.378
Cobb Middle School
4,320, KBTU
143160
30.179
Vandeventer Middle School
4,296, KBTU
30.010
Maus Middle School
4,258, KBTU
29.746
Hunt Middle School
4,113, KBTU
28.733
Pearson Middle School
3,376, KBTU
23.588
Trent Middle School
3,177, KBTU
22.193
46% Savings

19. Middle School Efficiency Cost/Sq. Ft. 2015 / 2016 School Year
Building
Cost
Area
Cost/Ft.2
Pioneer Heritage Middle School
$200,062.87
138306
$1.45
Staley Middle School
$179,779.57
128330
$1.40
Wester Middle School
$182,007.53
$1.32
Clark Middle School
$168,193.15
133318
$1.26
Fowler Middle School
$164,830.23
138650
$1.19
Scoggins Middle School
$167,615.03
142108
$1.18
Roach Middle School
$156,678.16
138651
$1.13
Cobb Middle School
$150,032.52
143160
$1.05
Vandeventer Middle School
$149,578.31
$1.04
Maus Middle School
$147,219.03
$1.03
Stafford Middle School
$144,775.88
$1.02
Hunt Middle School
$144,536.01
$1.01
Griffin Middle School
$138,869.72
138428
$1.00
Trent Middle School
$119,746.74
$0.84
Pearson Middle School
$118,419.72
$0.83

20. Elementary School Efficiency KBTU/Sq. Ft. 2015 / 2016 School Year

21. Elementary School Efficiency KBTU/Sq. Ft. 2015 / 2016 School Year
Building
Use
Prorated Area
Use/ft2
Christie Elementary
3,988, KBTU
74010
53.891
Anderson Elementary
3,759, KBTU
50.796
Shawnee Trail Elementary
3,787, KBTU
74977
50.521
Borchardt Elementary
3,551, KBTU
71806
49.456
Spears Elementary
3,540, KBTU
71755
49.343
Curtsinger Elementary
3,698, KBTU
76762
48.187
Gunstream Elementary
3,286, KBTU
45.802
Bright Elementary
3,386, KBTU
74591
45.395
Sparks Elementary
3,208, KBTU
72399
44.320
Smith Elementary
3,046, KBTU
73922
41.213
Fisher Elementary
2,985, KBTU
73327
40.715
Boals Elementary
2,688, KBTU
75736
35.500
Bledsoe Elementary
2,593, KBTU
75326
34.433
Riddle Elementary
2,525, KBTU
73572
34.327
Sem Elementary
2,597, KBTU
75904
34.218
Ogle Elementary
2,589, KBTU
34.113
Corbell Elementary
2,558, KBTU
33.710
Mooneyham Elementary
2,488, KBTU
75902
32.792
Taylor Elementary
2,487, KBTU
32.765
Robertson Elementary
2,437, KBTU
32.113
Ashley Elementary
2,435, KBTU
32.089
Carroll Elementary
2,401, KBTU
31.640
Tadlock Elementary
2,432, KBTU
77184
31.518
Isbell Elementary
2,336, KBTU
30.776
Pink Elementary
2,286, KBTU
30.358
Elliott Elementary
2,278, KBTU
30.021
Allen Elementary
2,476, KBTU
83960
29.501
Purefoy Elementary
2,275, KBTU
81144
28.048
Nichols Elementary
2,262, KBTU
27.888
Sonntag Elementary
2,134, KBTU
27.651
Rogers Elementary
1,734, KBTU
64586
26.863
Phillips Elementary
2,114, KBTU
26.061
Early Childhood School
2,629, KBTU
101784
25.836
Hosp Elementary
2,048, KBTU
79844
25.657
Newman Elementary
2,115, KBTU
82500
25.638
Comstock Elementary
2,056, KBTU
25.344
McSpedden Elementary
1,898, KBTU
23.776
Scott Elementary
1,950, KBTU
23.639
Norris Elementary
1,486, KBTU
18.623
Elementary School Efficiency KBTU/Sq. Ft / 2016 School Year
34% Savings

22. $26,839 Savings in four months (July, August, September and October)
Geothermal Retrofits
In the summer of 2016 three elementary schools were converted from a central plant to geothermal.
Building
Utility Type
2016
2017
Borchardt Elementary
Electric (KWH)
329,360 KWH
$33,381.22
251,760 KWH
$21,537.59
Natural Gas (CCF)
740 CCF
$720.66
420 CCF
$484.67
Borchardt Elementary Subtotal
$34,101.88
$22,022.26
Bright Elementary
312,000 KWH
$32,665.46
226,400 KWH
$23,705.60
517 CCF
$492.66
460 CCF
$508.74
Bright Elementary Subtotal
$33,158.12
$24,214.34
Fisher Elementary
272,480 KWH
$25,846.60
245,680 KWH
$19,962.79
372 CCF
$418.78
318 CCF
$386.59
Fisher Elementary Subtotal
$26,265.38
$20,349.38
$26,839 Savings in four months
(July, August, September and October)

23. Energy Star Scores Average ES score for central plant building is 80
Group Name
Number Of Properties
Average ENERGY STAR Score Baseline (1-100)
Average ENERGY STAR Score Current (1-100)
Total Baseline Square Footage (ft²)
Total Current Square Footage (ft²)
National Building Competition 57 91 93
6,748,346
6,791,256
Elementary Schools 33 90 92
2,495,751
Middle Schools 13 87 88
1,810,844
High Schools 6 97 98
2,062,400
2,064,955
All Groups
Average ES score for central plant building is 80
Average ES score for geothermal building is 95

24. Questions