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Geothermal Heat Pump Presentation

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... 7000 heating degree days. Summer: Avg. Jul. low = 85oF , 200 cooling degree days. Chiloquin ... Thermal Conductivity = 0.62 Btu/hr/ft/oF (dry sediments) ... – PowerPoint PPT presentation

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Learn more at: http://geology.utah.gov
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Title: Geothermal Heat Pump Presentation


1

Geothermal Heat Pump Case Study I
Chiloquin Community Center 16 vertical
boreholes water-water heat pump providing
radiant floor heating and cooling

Andrew Chiasson Geo-Heat Center Oregon Institute
of Technology
2
Chiloquin Community Center
  • Location and Background
  • Southern Oregon, east of Cascades
  • Building Use Art gallery, library, meeting hall,
    Sherriff Dept.
  • Gross Floor Area 13,000 ft2, single floor
  • Construction New in 2003, insulated concrete
    form (ICF)
  • Winter Avg. Jan. low 22oF , 7000 heating
    degree days
  • Summer Avg. Jul. low 85oF , 200 cooling degree
    days

3
Chiloquin Community Center
  • Ground Source System
  • Ground Temp. 56oF
  • Thermal Conductivity
    0.62 Btu/hr/ft/oF (dry
    sediments)
  • 16 vertical boreholes (4 x 4 grid pattern), 300
    ft deep, 20 ft spacing
  • Single U-tube, thermally-enhanced grout
  • Methanol/water solution

4
Chiloquin Community Center
  • Interior System
  • Radiant floor heating cooling
  • One 15-ton water-water heat pump controls water
    temperature in a storage tank, which provides a
    thermal buffer
  • 15 zones on variable-speed pumps
  • Ventilation air (4,000 cfm) handled by an energy
    recovery unit in the attic, controlled by
    occupancy and CO2 sensors
  • Web-based building controls

5
Chiloquin Community Center
  • Project Costs and Economics
  • Total HVAC system cost 237,400 (18.26/ft2)
  • Geothermal loop portion 48,000 (3.69/ft2)
  • Economic Incentives
  • Oregon Business Energy Tax Credit 80,000
  • Annual HVAC Energy Use
  • 5.8 kWh/ft2 gt 5,350 (0.41/ft2)

6

Geothermal Heat Pump Case Study II
South Cariboo Recreation Centre, British
Columbia Integrated Geothermal Heat Pump
HVAC/R at a Hockey Arena

Acknowledgement Information and data provided by
Ed Lohrenz, Ice-Kube Systems
7
S. Cariboo Ice Arena
  • Energy use in arenas

8
S. Cariboo Ice Arena
  • Ice arenas have many simultaneous heating and
    cooling loads

9
S. Cariboo Ice Arena
  • Integrated geothermal heat pump system

10
S. Cariboo Ice Arena
  • System summary and benefits
  • 84 tons of refrigeration for ice rink
  • 20 tons for dehumidification
  • 10 tons for service hot water
  • 48 tons heating/cooling for arena, offices,
    lobby, change rooms
  • Earth loop used only when building temperatures
    are met
  • Eliminates ammonia refrigeration and
  • associated stringent safety precautions
  • oil disposal costs
  • annual compressor rebuilds
  • regular monitoring
  • Heat pumps use 10 of the refrigerant charge of
    conventional
  • Heat pumps use non-toxic R404A, and can operate
    down to 0oF on the evaporator side and 125oF on
    the condenser side

11
S. Cariboo Ice Arena
  • System economics

Maintenance Cost
  • 2-year payback with federal incentive, 3-years
    without

12

Geothermal Heat Pump Case Study TBA?
Supermarkets

Acknowledgement Ministry of Natural Resources
Canada
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