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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 6. COOLING SUPPLY FOR CONDENSERS (WATER AND AIR) To maximize system performance and take advantage of the excellent cold water resources available locally, the first ORC module was designed to be water cooled at 40oF. In order to maximize net power production, a water supply system was designed which would require no pumping load. This was accomplished by employing a low tech siphon to ‘pull’ water out of a shallow, large diameter well located 2700ft to the east of the power plant. The elevation difference of +33ft between the cold water well and the power plant allows 1500gpm to flow through each condenser at 5psi without a pump. To minimize pressure loss due to friction in the pipeline, the pipeline was oversized with 2400ft of 18in and 300ft of 16in steel pipe. The cold water gains 10oF in the condenser before being discharged to Monument Creek via an existing drainage ditch which runs under the runway through a 24in culvert. Chena Power has obtained a permit (2006DB0040) to discharge this water from DEC, along with a water use permit from DNR. Both permits are on file at Chena Hot Springs Resort. An automated shutdown procedure is in place to avoid the potential for refrigerant discharge into Monument Creek if a leak in the condenser is detected. Figure 11. Installation of 16in Cold Water Pipeline, July 2006 Due to time constraints, only portions of the pipeline were insulated and buried prior to freezeup in October, 2006. The remaining sections will be completed in 2007. To compensate for freezing temperatures, a supplemental 3in hot water line was installed piggyback on the cold water line along the entire length. Additionally, the second ORC unit, installed in December 2006, was designed to be cooled either with air or water. 20PDF Image | 400kW Geothermal Power Plant at Chena Hot Springs
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