[PDF] Geothermal Heating System Retrofit Modoc Joint Unified School District Alturas California eBook

Author : Kevin Rafferty
Publisher :
Page : 6 pages
File Size : 43,29 MB
Release : 1995
Category : Alturas (Calif.)
ISBN :

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This report contains the results of a review of the final design drawings for a retrofit, direct use, geothermal system serving an elementary/middle school complex in Alturas (northern), California. Geothermal fluid at 170°F is delivered to the system from an artesian production well. Heat is passed through a plate heat exchanger to a closed hydronic loop serving both schools. Cooled geothermal fluid is disposed of to the surface. Comments on the design were in the areas of balancing (suggested automatic balancing valves), temperature control valve (questioned adequate actuator force and materials), heat exchanger (suggested piping to allow maintenance and questioned materials), circulating pumps (questioned control, suggested alternate design for reducing size), ventilation (questioned whether retrofit would trigger new ventilation requirements), existing heat pump units (questioned coil retrofit design).

Author :
Publisher :
Page : 22 pages
File Size : 49,28 MB
Release : 1983
Category : Alturas (Calif.)
ISBN :

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A geothermal system for the Modoc County buildings has been considered in this study. The system would serve the Courthouse (24,000 ft2), Courthouse annex (4080 ft2), the Sheriff's Office/Jail (5850 ft2) and the Beli building (6000 ft2). Based on an assumed resource temperature of 130°F and a 1500' production well, retrofit costs for the four buildings were calculated. Only the Courthouse would require a major system replacement. Three options were considered for disposal of the geothermal fluid: injection well on the Courthouse grounds; river disposal; injection well at the Museum 1000' south of the Courthouse.

Author : Gertsch, Juncal and Associates
Publisher :
Page : pages
File Size : 18,14 MB
Release : 1984
Category : Geothermal engineering
ISBN :

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This conceptual engineering study has examined the feasibility of implementing geothermal space and water heating systems at the high school and elemetary school facilities (Surprise Valley School District) in Cedarville, California. The two geothermal wells, which would serve as the energy source for the project, have more than sufficient productive capacity of fluids at temperatures to efficiently heat both school complexes. The wells produce fluids in the temperature range l20-126°F. Peak flow requirements are 66 gpm at the high school and 43 gpm at the elementary school. Average flow requirements are about 25 and 17 gpm, respectively. The fluids are exceptionally clean, at about 178 TDS. Seven engineering design approaches were examined for their technical and economic merit for the proposed application (four for the high school building and three for the elementary school building). The optimum design for the high school is based on the direct use of geothermal fluids in cabinet heaters and unit heaters. The system would displace the schools current reliance on 8-10,000 gallons of fuel oil annually. The optimum design for the elementary school would involve the direct use of geothermal fluids in existing hot water slab systems and the addition of water coils in electrical resistance equipment in the north classroom annex. The geothermal heating system would replace the schools current reliance on about 4200 gallons of fuel oil and 42,885 KWH of electric resistance heating annually. At both installations, existing boiler systems would be retained for backup and infrequent peaking requirements. The cleanliness of the geothermal fluids will permit surface discharge at both project locations. A 25-year life cycle cost-benefit analysis was completed for each school system and the project as a whole. At the elementary school, the savings stream has a Net Present Value (10% DF) of $107,612 on capital expenditures of $73,991 and a 12-year simple payback. At the high school, the savings stream has a Net Present Value of $94,595 on capital expenditures of $118,894 and a simple payback of 22 years. The economic performance of the combined project has a discounted savings stream of $202,207 on capital expenditures of $192,885 and a simple payback of 13-16 years, depending on how closely actual current fuel oil consumption corresponds with predicted heat loads and fuel consumption.