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4. The fourth is the performance and economic comparison of two ORC systems. One ORC system is a 50kW system, which uses screw expander, comes under emerging technology. The second ORC system is a Pratt & Whitney (P&W) 250 kW unit which uses radial turbine belongs to the category of well-developed technology. Performance and economic benefit of the 50kW ORC system have been evaluated in the Chapter of Data Analysis. However, due to an unexpected turbo charger break down of the Cordova diesel generator set, to which the 250kW ORC system will be installed, performance information of the 250kW ORC becomes unavailable at this moment. Therefore, the result of the fourth task, comparison in performance of the two ORC systems, is not included in this report and will be provided in a make-up report once the performance data of the 250kW ORC system becomes available. NEAR FUTURE WORK: Following the completion of the Phase 1 laboratory test, it is the intent of ACEP to transport and install the GM in a power plant in the Tanana Chiefs Conference (TCC) region in order to conduct a field test under real-world conditions. ACEP maintains a partnership with TCC, a non-profit consortium of forty-two Alaska Native tribal communities in the interior region of the state, for rural energy research and development. The project location has been tentatively determined, but discussions with Alaska Power & Telephone regarding the power plant in Tok are still ongoing. It is anticipated the Phase 2 field test will provide actual (not projected) emissions reductions results. The field test is funded with support from the AEA Renewable Energy Fund. The expected date for the ORC system relocation is tentatively determined on April 30st, 2012. Major activities for relocation and preparation of field testing include: 1. Selection of the village for relocation: Tok is the tentative candidate due to the size and load of the power plant and easiness in transportation. 2. Procurement and layouts of required heating and cooling piping systems, electrical circuit for uploading, and instrumentation and monitoring system: The emphases are on optimizing the benefit to the village and avoiding negative effect of the added system on the performance of the diesel power plant, such as emissions and combustion efficiency, stability and effectiveness of the local electrical grid, etc. 3. Preparation of the ORC system for relocation and starting: This may include discharge of refrigerant from the ORC system, packaging and shipping, recharge and starting of the ORC system, etc. COMMENTS: 1. Modify the GM to increase its power capacity from 50kW to 65kW: Reason: This may increase the output of the GM and also the maximum net efficiency of the system (projected maximum efficiency is about 8.5%). All the components of this ORC system are designed and selected for 65kW operation. The modification is only a minor operation. 60PDF Image | Optimizing Heat Recovery Systems for Power Generation in Rural AK
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