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FUTURE PLANS GTP’s Low Temperature and Coproduced subprogram intends to provide the geothermal community with the means to achieve development and widespread deployment of economically viable, innovative, and scalable technologies that will capture a significant portion of the low temperature geothermal resource base over the next two decades. In order to achieve this goal, the subprogram has identified three avenues, or activity areas, that must be pursued in order to turn this goal into a reality. These areas are advancing technologies, fostering deployment, and informing policy. The RMOTC project will continue to address challenges in both the advancing technologies and fostering deployment areas of the subprogram portfolio. The GTP subprogram will work to achieve its low temperature power production goals thru a coordinated effort with RMOTC staff. The program will provide funding for continued testing of program related geothermal activities at the site. In addition, future Financial Opportunity Announcements (FOAs) may become available to help companies implement unit testing at the facility. Finally, the subprogram will provide guidance and oversight on all projects, as well as seek to discover and employ innovative concepts and ideas at the RMOTC test site, specifically those related to system improvements. RMOTC plans to continue to operate the unit for an addition 2 years under the collaborative agreement with DOE’s Geothermal Technologies Program. Also under this program, a second power generation unit of the same nominal generation capacity but water cooled will be installed and tested for 3 years. This period of performance will provide operational data and experience to transfer to potential users for both air and water cooled systems in both an oil field and low temperature geothermal settings. During this time, RMOTC will be developing a test facility for smaller geothermal systems and developing plans for EGS applications and testing. NRELs future geothermal activities on this low temperature/coproduction project will be focused on data collection, data analysis and resolving fundamental challenges associated with geothermal technologies. The instrumentation and data systems will be installed on the Ormat and UTC ORC units in the second quarter of 2011. The sensors being procured will monitor temperatures, pressures and flows of the brine and working fluids. Sensors will also be installed to monitor the power output of the unit and the parasitic power consumed by the unit. A weather station will be installed to collect data on ambient weather conditions and the effect of ambient conditions on power output of the unit. Baseline data and long-term data will be collected and stored in NREL databases. Non proprietary data from these units will be made available to the public thru integration with the National Geothermal Data System (NGDS). Publically viewable data display screens of the Ormat and UTC ORC units are being planned to showcase the operation and power output of these coproduction systems. Key data analysis to be reported includes system efficiency calculations, base load power offset, and LCOE determination. NREL will also be involved in implementing system improvements to the Ormat and UTC ORC units to address current challenges faced in the geothermal industry. After NREL installs the instrumentation and data systems are installed, baseline data will be collected and analyzed to evaluate potential system improvements. Hybrid cooling technology evaluation is the target of NREL’s modeling and analysis of the Ormat ORC system. NREL is currently evaluating commercially available hybrid cooling systems that can be retrofitted to the Ormat unit to improve its annual power output. NREL is evaluating hybrid cooling technologies by modeling the performance of the Ormat system in Aspen. The modeling is being performed to evaluate the effectiveness of changing the cooling system from an air cooled condenser to a hybrid air/water cooled system. Modifications/improvements to the UTC PureCycle ORC system are also planned, but no specific process modification/system improvement has been down selected. Overall, NREL’s future activities will be focused on recording/analyzing data from these geothermal ORC systems to improve their performance and promote the use of these renewable low temperature geothermal energy technologies. ACKNOWLEDGMENTS Reprinted with permission from the Stanford Geothermal Workshop, 2011. 12 GHC BULLETIN, FEBRUARY 2010PDF Image | SYSTEMS FOR ELECTRICAL POWER FROM CO-PRODUCED
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