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Table 2. OEC Projected Performance at Design Temperature Figure 4. Organic Rankine Cycle (ORC) 250 kW low- temperature geothermal system at NPR-3. ture of 50 °F, the anticipated performance is given in Table 2. This unit has a nominal rating of 250 kW and has three main components: an 8-foot by 40-foot vaporizer skid which also contains the turbine, generator, and in- strumentation cabinet; and two 8-foot by 40-foot finned- tube condensers (Figure 4). The unit was wired directly Table 3. Design & Operational Data into a 480-volt leg of the field power distribution sys- tem. The power from the unit is metered and monitored for reliability and quality. For field safety purposes, the Ormat unit was installed such that the unit shuts down if the main field power is interrupted. RESULTS AND DISCUSSION The air-cooled power generation system was installed in August 2008. The design of the unit was based on a relatively low produced water temperature of 170 °F and an average ambient temperature of 50 °F, Table 2. At design conditions, the nominal 250 kW unit would produce a gross power of 180 kW (net 132 kW). How- ever, between initial design and installation, two major changes were made. With the equipment, the pump for the working fluid, isopentane, was incorporated into the turbine-generator package. By incorporating this feature, the parasitic electrical load of the unit was decreased from 48 to 25 kW. On the field side, the Tensleep pro- duction facility was upgraded and an insulated, produced water storage tank installed. This upgrade kept the pro- duced water temperature in the 195 to 198 °F range. The higher inlet water temperature permitted the sys- tem to operate nearer the optimum/maximum net pow- er output of 225 kW. The operational results are divided into two phases. The first phase is from September 2008 to February 2009, the period from initial startup of the unit until shutdown for repair and maintenance. The second phase is from September 2009 to January 2010. The period between the two phases was when the unit Rocky Mountain Oilfield Testing Center 3 This document may contain protected Cooperative Research and Development Agreement (CRADA) information and is not to be further disclosed for a period of 5 years from the date it was produced except as expressly provided for in the CRADA.PDF Image | Ormat: Low-Temperature Geothermal Power Generation
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