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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 Previous installations of the PureCycle® power systems have been deployed on a “stiff” grid. The induction generator is connected to the grid by either a wye-delta or soft- starter. Grid protection is provided by the non-islanding properties of the induction generator and, if required, a utility protection relay. Chena Hot Springs Resort provides its own grid via 3 large (750 kVA) UPS systems, which can be powered by multiple sources (diesel genset, geothermal power plant). The ORC induction generator may be started from the inverter output, and be used to reduce the load seen by the UPS systems. When the total facility load is less than the ORC output, the ORCs charge the UPS batteries. 4.4 Heat Exchangers Most commercial geothermal power plants use separate heat exchangers to preheat and vaporize the working fluids. Using two separate heat exchangers can increase manufacturing costs and installation complexity compared with using a single heat exchanger. The UTC Research Center designed an integrated evaporator with preheater such that the preheater section is integrated into the bottom of a shell-and-tube heat exchanger while the boiling section occupies the top portion of the heat exchanger. In this case, the hot geothermal liquid flows in the tubes while the working fluid absorbs heat on the shell side. There is a partition panel dividing the two heat exchange sections and a distributor nozzle to guide the working fluid flow into the evaporator section from the baffled preheater section. This integrated evaporator design provides the required heat transfer capacity to preheat and vaporize the working fluid within just one heat exchanger shell that can be produced on existing production lines, reducing both component cost and system complexity. A separate water analysis has been performed prior to the heat exchanger design finalization in order to assure the correct selection of materials. It should be noted that Chena water analysis shows that the both the geothermal water quality and that of the surface water is “drinkable”, meaning it is soft and has low ammonium. Based on the water analysis and Carrier’s water quality guidelines for heat exchanger, the tube materials for the heat exchangers were then finalized. The evaporator size to provide the required heat capacity is: 2-pass on geothermal resource side, including 1-pass in boiler region, 260 tubes 1 pass in preheater region, 90 tubes 3⁄4” OD, 0.035” tube thickness, Cupro-Nickel 90-10 TurboChill 32” OD shell, 10” flanges The condenser is a standard tube-and-shell heat exchanger used in Carrier’s commercial chiller line. Based on the cycle analysis, the condenser size to provide the required heat rejection capacity is: Carrier 19XR Frame 5, size 57, 2-pass, 602 tubes 15PDF Image | 400kW Geothermal Power Plant at Chena Hot Springs
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