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Geoexchange at CMU

Geoexchange at CMU. 2012. Colorado Mesa University. Regional public higher education institution 3 campuses in Grand Junction, CO. Main campus 78 acres and 1.5 million s.f. under roof. Enrollment of just over 9,000 students. Why Geoexchange at CMU?.

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Geoexchange at CMU

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  1. Geoexchange at CMU 2012

  2. Colorado Mesa University • Regional public higher education institution • 3 campuses in Grand Junction, CO. • Main campus • 78 acres and 1.5 million s.f. under roof. • Enrollment of just over 9,000 students

  3. Why Geoexchange at CMU? • The use of G.S.H.P. at CMU began in the fall of 2007. • In part, resulted from Governor Ritter’s Greening State Government initiative that called for a 20% reduction in State government energy use by June 30, 2012. • “state government should lead by example…”

  4. Geo & Energy Independence Increased to 1,800 Tons of Heating and 1,600 Tons of Cooling Thru Geo-Exchange Energy Independence Outcomes: Increase to 1.2 MW of Solar Electricity 192 Jobs Created/Saved; $37M in Economic Activity 10,040 Tons of CO2 Emissions Reduced Per Year

  5. Was Geo Accepted by All? • The administration at CMU was not only open to the concept of GX, they pushed to see how far the concept could be taken. • The decision was made during the summer of 2007 to expand geo to include additional drill fields and a system of pipes that would connect drill fields to buildings across campus.

  6. Planning for a Central Loop Initial loop would move (up to) 1,500 tons. * Source: Cary Smith, Sound Geothermal

  7. Planning for a Central Loop Quantum Group Engineering LLC The Results were very good. The earth conditions were towards the upper end for soils on the Western Slope. TC – 1.24 btu/hr-ft-oF Diffusivity: .09 ft2/day Deep Earth: 61 – 64.5 oF

  8. Constructing a Central Loop 8” dia. pipes between central loop & H.H Drill Field Drill Rig

  9. Additional Drill Fields Pipes connecting Bore holes Drill fields south of A.C.B.

  10. CMU’s Community Hybrid GX System -Hybrid System. A hybrid GX system is a heating and cooling system that couples renewable energy system(s) with conventional technology. -CMU’s hybrid GX system includes drill fields, boilers and cooling towers. -Three separate drill fields -234,000 lineal feet of geo-exchange tubing -5,000 lineal feet of 18” diameter loop field pipe (central loop)

  11. Community Hybrid GX System 3 (or more) “Least Energy Path(s)”: • The building shares energy with itself. • The building shares energy with other buildings (take energy from or give energy to the central loop). • The SYSTEM calls for assistance from renewable (central loop or solar). • The SYSTEM calls for assistance from conventional equipment. * Source: Cary Smith, Sound Geothermal

  12. Buildings Connected -Academic Classroom Building (56k sf) -North Residence Hall (110ksf) -University Center (100k sf)  -Wubben Hall (43,375 s.f.) -Wubben /Science Ctr. Exp. (26,222 sf) -Houston Hall renovation/addition (80,940 sf) -Bunting Residence Hall(72,500).

  13. Central Loop Student Center Classrooms Dormitories * Source: Cary Smith, Sound Geothermal

  14. Building Assets • Houston Hall (Existing) • Add new mechanical rooms • Add central loop tie in • Add one new borefield • Add future borefield stub-out • Heat exchanger to couple existing boilers to central loop Existing Thermal Assets: Building Three Boilers Rooftop Cooling Retrofit: Water-Water GXHP, fan coils and chilled water coils. * Source: Cary Smith, Sound Geothermal

  15. Main Central Loop mechanical room. Chiller Cooling tower #1 Central Loop Pumps Boilers Chiller Building CT #2 * Source: Cary Smith, Sound Geothermal

  16. Single button Campus Demand Limiting: Campus wide load shedding during peak events. * Source: Cary Smith, Sound Geothermal

  17. Community Hybrid GX System Current Project Size: 500k ft2 2,400 gross tons 25 miles of loop 6 boilers 3 fluid coolers Academic Classroom Building – 56k s.f. North Ave. Student Housing - 110k s.f. Science Center & Wubben – 69.5k s.f. University Center – 100k s.f. Bunting Ave. Student Housing – 72.5k s.f. Houston Hall – 80.9k s.f. * Source: Cary Smith, Sound Geothermal

  18. Invested to Date? -Drill Fields - $4.4 million -Central Loop - $1.2 million -Main System Pumps -$713k -Global Management System - $200k -Total - $6.5 million -Energy savings in excess of $300k / year  * -Conservative estimates show our Carbon footprint reducing by 8,188 metric tons through the use of GX -Estimated Load-shed Value (Per event) $5,000 - $10,000 *($.05/kWh, consumption of 22 kWh/s.f./yr for trad. hvac vs. 10 kWh/s.f./yr for GSHP).

  19. Why Geoexchange at CMU? • CMU, like many other business, continues looking for ways to be more competitive; to offer uncompromising quality at a price point lower than that of our competitors. • Reducing and/or conserving energy through the use of geo, while generating energy on-site through the use of solar, reduces our Carbon footprint, creates jobs locally and saves CMU money.

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