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GEOTHERMAL RESOURCES GLENWOOD SPRINGS, COLORADO

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GEOTHERMAL RESOURCES GLENWOOD SPRINGS, COLORADO ( geothermal-resources-glenwood-springs-colorado )

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Simple pay back: 450,000/(105,100 – 12,000) = 4.8 years Return on investment (30 years) = 20.6% 9b. Open Loop Geothermal Heat Pump System. An open loop system would require both production and injection wells about 300 feet deep producing 2.5 gpm per ton of load or 438 gpm total during the peak period. This is anticipated to require two production and two injection wells. 4 wells at 300 feet each at $125/foot: 2 production pumps @ $25,000 each: 175 tons of HP @ $1,000/ton: Piping and retrofit for the HVAC system: Total capital cost: Annual operating cost of 2-20 hp pumps: Other O&M costs: Total annual cost: $150,000 $ 50,000 $175,000 $100,000 $475,000 $ 10,000 $ 10,000 $ 20,000 Simple payback: 475,000/(105,100 – 20,000) = 5.6 years Return on investment: = 17.9% 9c. Closed Loop Geothermal Heat Pump System. A total of 175 holes 250 feet deep would be required for the peak load. 175 holes @ 250 feet @ $14/foot : 175 tons of HP @ $1,000/ton: Circulation pumps @ $40,000 Piping and retrofit of HV AC system: Total capital cost: Annual operation costs of pumps: Other O&M cost: Total annual cost: $ 612,500 $ 175,000 $ 40,000 $ 100,000 $ 927,500 $ 5,000 $ 5,000 $ 10,000 Simple payback: 927,500/(105,100 – 10,000) = 9.8 years Return on investment: = 9.6% 9d. Using Waste Water from the Pool. This would require construction of a pipeline across the river along with booster pumps to get the water to the Center. The pipeline would be approximately 800 feet long and cost $500,000 if placed on the river bottom, and $400,000 if suspended below a bridge. Since the temperature of the waste water is only around 90oF, the temperature would have to be boosted for the activity 43

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