Optimizing Heat Recovery Systems for Power Generation in Rural AK

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Optimizing Heat Recovery Systems for Power Generation in Rural AK ( optimizing-heat-recovery-systems-power-generation-rural-ak )

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maintenance days), and diesel fuel saved 28,238 gallons (assumption: 14kW-hr/gallon for rural Alaska diesel power applications). The estimated annual reductions in CO2 is 316 tons, CO 174 lbs, HC 261 lbs, PM 148 lbs, and NOx 6,013 lbs. With an interest rate of 10% and a diesel fuel price of $5/gallon, the payback time is about 4.6 years, assuming that the diesel power plant cooling system is enough for the ORC cooling. With 0% interest rate, the estimated payback time then becomes 3.6 years. Performance test was conducted for more than 50 hours after the reliability test. The performance test measured the electrical output of the ORC system and the performance parameters (e.g., temperatures and pressures of working fluid) of its components with respect to cases of different combinations of the temperatures and flow rates of the heating and cooling sources. The results measured from the test showed performance consistency of every ORC system component for every case. The results also showed that the efficiency for gross output of the ORC system ranges from 5.6% to 8.2% (net efficiency from 5.3 to 7.6) for a wide range of heating source and cooling source conditions. The measured performance test results were used to construct the performance characteristic charts of the ORC system in terms of the heating and cooling source conditions. An example was given to demonstrate how these charts could be used to predict the performance, emissions and CO2 reductions, and economic effect of applying the ORC system on a village diesel generator. The conclusion of the testing is that the ORC system is feasible and reliable for diesel generator waste heat recovery. The technology requirement in operating the system is minimal. The technology requirement in maintenance is expected feasible for rural village diesel generators, especially if the maintenance schedule of the ORC system is combined with the diesel generator maintenance schedule. Economic impact may depend on the match between the ORC system and the load pattern and capacity of the village generator set. In general, for an appropriate match, the economic impact is positive and promising. 4

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