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

Chiloquin Community Center Location and Background: Location and Background:  Southern Oregon, east of Cascades  Building Use:Art gallery, library, meeting hall, Sherriff Dept.  Gross Floor Area:13,000 ft 2, single floor  Construction:New in 2003, insulated concrete form (ICF)  Winter:Avg. Jan. low = 22 o F, 7000 heating degree days  Summer:Avg. Jul. low = 85 o F, 200 cooling degree days

Chiloquin Community Center Ground Source System: Ground Source System:  Ground Temp. = 56 o F  Thermal Conductivity = 0.62 Btu/hr/ft/ o F (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

Chiloquin Community Center Interior System: 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 CO 2 sensors  Web-based building controls

Chiloquin Community Center Project Costs and Economics: Project Costs and Economics:  Total HVAC system cost:$237,400 ($18.26/ft 2 )  Geothermal loop portion:$48,000 ($3.69/ft 2 )  Economic Incentives:  Oregon Business Energy Tax Credit = $80,000  Annual HVAC Energy Use:  5.8 kWh/ft 2 => $5,350 ($0.41/ft 2 )

Geothermal Heat Pump Case Study II Acknowledgement: Information and data provided by Ed Lohrenz, Ice-Kube Systems South Cariboo Recreation Centre, British Columbia: Integrated Geothermal Heat Pump HVAC/R at a Hockey Arena

S. Cariboo Ice Arena Energy use in arenas Energy use in arenas

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

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

S. Cariboo Ice Arena System summary and benefits 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 0 o F on the evaporator side and 125 o F on the condenser side

S. Cariboo Ice Arena System economics System economics 2-year payback with federal incentive, 3-years without 2-year payback with federal incentive, 3-years without Maintenance Cost

Geothermal Heat Pump Case Study TBA? Acknowledgement: Ministry of Natural Resources Canada Ministry of Natural Resources Canada Supermarkets Vegetable Display Supermarket Entrance Supermarket Interior