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Fostering development of innovative solutions to Alaska’s energy challenges. Next Steps Now that the Green Machine has proved promising in a controlled laboratory environment, the next step is to test it in the real-world conditions of a rural village. ElectraTherm is also interested in the performance data that ACEP will collect during the device’s field deployment. ACEP, in partnership with Tanana Chiefs Conference (TCC), which owns the Green Machine, assessed each of the 42 com- munities in the TCC region as appropriate testing grounds for the device based on several factors, including capacity and interest of the utility, ease of access, current configuration of the power plant and the existing use of waste heat in each community. Based on this assessment, Tok was selected in partnership with its utility, Alaska Power and Telephone (AP&T), which manages several power plants statewide. The Green Machine will be installed in AP&T’s Tok power plant in the summer of 2013, and AP&T has agreed to contribute its expertise and trained man- power at the test site. If the Green Machine performs as well in Tok as it has in the UAF power plant, it will be clear that the Green Machine, and possibly other small-scale ORC systems, is feasible for use in Alaska power plants in the future. Future Considerations One important consideration for future installations in Alaska is how this device could impact the current uses of waste heat in communities. For instance, AP&T’s Tok power plant Calculated payback period for Green Machine at different jacket water temperatures and flow rates, assuming: 1. 363 working days per year with two days of maintenance 2. Stationary diesel engine specific fuel consumption of 3.7kWh/lit (14kWh/gal) 3. Diesel fuel cost of $5/gal 4. Total initial investment cost (component cost + installation cost) estimated at $280,500 (includes GM cost). 5. Estimated yearly maintenance cost of $7,600 currently uses a portion of its waste heat to heat its office and shop spaces. In winter, more waste heat is used for space heating, leaving less for the Green Machine’s use. In summer, less heat is used for space heating, but the Green Machine’s cooling needs will be more difficult to meet. Active cooling will draw more parasitic power and reduce the net amount of electricity that the Green Machine produces. This balance will be considered and monitored during testing to determine the most viable configuration for future installations. Notes 1 Wiser, Wendell H. 2000. Energy resources: occurrence, Production, Conversion, Use. Birkhäuser. p. 190. ISBN 978-0-387-98744-6. 2 www.chenahotsprings.com/geothermal-power/ 3 Avadhanula, V., Lin, C., and Johnson, T., “Testing a 50kW ORC at Different Heating and Cooling Source Conditions to Map the Performance Characteristics,” SAE Technical Paper 2013-01-1649, 2013, doi:10.4271/2013-01-1649. For further information on this report, please visit www.uaf.edu/acep or contact: Daisy Huang, Research Engineer Alaska Center for Energy and Power Tel. 907-474-5663 dhuang@alaska.edu University of Alaska Fairbanks 814 Alumni Drive Fairbanks, AK 99775-5880 More information can be found on ACEP’s website, www.uaf.edu/acep/projects.PDF Image | Means for Increasing Diesel Engine Efficiency in Alaska
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