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Fostering development of innovative solutions to Alaska’s energy challenges. The Green Machine: A Possible Means for Increasing Diesel Engine Efficiency in Alaska Research Briefing The Green Machine: A Possible Means for Increas- ing Diesel Engine Efficiency in Alaska This report looks at whether an organic Rankine cycle device can be added to Alaska’s rural power plants to economically generate additional electricity from excess heat from diesel generators. Project Introduction The isolated rural villages in Alaska annually consume about 370,000 MWh of electrical energy, which comes from individu- al diesel-fired generator sets. Because the generators must be sized for the maximum usage a village will need, the genera- tors are running at less than full capacity during off-peak times; the ratio of electrical power produced to fuel energy consumed is generally less than 40%. The rest of the fuel en- ergy is lost as heat. While some power plants utilize a portion of this for other heating needs, such as space and water heat- ing, the majority of this energy in Alaska is wasted. The goal of adding organic Rankine cycle (ORC) products to an existing power cycle is to reclaim some of this heat to generate a bit more power, increasing the overall fuel efficiency of the power plant. While this technology is mature for larger-scale power generation, the products for smaller-capacity generator sets, appropriate for the typical size of Alaska village power plants, are still new to the market or in prototype phase. Many villages are being approached by these product developers to invest in this new technology, so ACEP, in partnership with its funding partners, the Denali Commission and the Alaska Energy Authority, set out to test its viability in Alaska. ElectraTherm’s “Green Machine” was identified as one of the devices with the highest potential for success. The Green Machine is designed to generate up to 50 kW of power using The Alaska Center for Energy and Power (ACEP) is an applied energy research group housed under the Institute of Northern Engineering at the University of Alaska Fairbanks. ✖ ACEP and Tanana Chiefs Conference In 2010, the Alaska Center for Energy and Power (ACEP) partnered with Tanana Chiefs Conference (TCC), a non- profit consortium of 42 communities in Interior Alaska, to obtain and test a 50 kW Green Machine. ACEP tested the Green Machine for 600 hours at the University of Alaska Fairbanks (UAF) power plant and collected and analyzed the data, finding promising results. In the meantime, TCC facilitated communication between ACEP and the villages to help select an Alaska community whose power com- pany would be willing to field test the Green Machine. Tok was selected by TCC, and the Green Machine will be installed in the Tok power plant in the summer of 2013. UAF photo by Todd Paris Mechanical engineer- ing doctoral student Vamshi Avadhanula mans the controls of the Green Machine. In addition to the technical aspects of the study, researchers are assessing whether operations and main- tenance of the device would impose a signifi- cant burden on rural power plant operators. the organic Rankine cycle, which is a process used to obtain energy from lower-value (lower temperature) heat sources than are commonly used for power generation. Alaska Center for Energy and Power • 907-474-5402 www.uaf.edu/acep • www.energy-alaska.com www.akenergynetwork.com This fact sheet is produced by Alaska Center for Energy and Power in cooperation with the UAF Cooperative Extension Service. UAF is an AA/EO employer and educational institution.PDF Image | Means for Increasing Diesel Engine Efficiency in Alaska
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