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skid to be operated (i.e. heat exchangers, piping, working fluid feed pump, turbine, electric generator, control and switch-gear) fit into the container. In early mid-July 2008 a 30 kW unit and an 80 kW unit were being built in Toronto. By July 29, 2008 the 30kw unit had been sold to a geothermal application in Casper, WY. It is hoped that in a month or so data will be ready for analysis. While the website does list some performance specifications this are only theoretical calculations. Hopefully this test site in WY will show that the theoretical calculations where right. A price of $60,000 was quoted over the phone for the 30 kW unit although it is not know how much it sold for to the geothermal plant in WY. Also a delivery time of 11 weeks was quoted, presumably from day of purchase. Barber-Nichols Barber-Nichols is a leader in the field of turbomachinery. Thermodynamic Cycle Systems including the Organic Rankine Cycle and the Steam Rankine Cycle are part of their core competency. They have already built waste heat applications but on an industrial scale. These units are much too large to be used with diesel engines but they demonstrate that Barber-Nichols is competent in the technology. They are currently working with some Canadian companies, however, to develop smaller units that could be used with diesel engines. Since these are custom designed units based on the size of the generators an interested buyer would need to send in specifications regarding their application. During a phone call with a company representative a price range from few hundred-thousand dollars up to $1M was put forward as an estimate of the total cost, including initial research, NRE, and unit itself. ElectraTherm Nevada based ElectraTherm has recently come out with their own ORC unit that captures waste on a smaller scale. They have plans for units ranging from 30-500 kW. It is not clear how many units they have indeed sold and that have been field tested, but one unit at SMU in Texas is known to be running and undergoing field tests, and it is most likely that this is their only one. This unit was demoed at the Geothermal Conference at SMU in June of 2008. Dr. Dennis Witmer from the Alaska Center for Energy and Power at the University of Alaska, Fairbanks traveled there to get a first hand view of the unit. Overall, the demonstration was not very impressive according to Dr. Witmer. The unit was very loud and there seemed to be some grinding sound, as well some of the parts looked like they were used parts. More importantly, though, it is unclear whether the unit is making any net power when parasitic power is taken into account. On a follow up phone call with Michael Paul from SMU in July 2008 he mentioned that an availability test had not been done since it was not a waste heat application. So it is unclear how long these units can be up and running before maintenance needs to be done. Currently, SMU is not planning on buying the unit after what they saw in the tests they did. The latest price that was available was $2400-$2700 per kW. TransPacific Energy This Nevada bases company is developing a heat recovery/energy conversion system using ORC technology. They claim on their website that their system can use heat sources at temperatures as low as 80oF and up to 900oF. This is a larger range than most 66PDF Image | Optimizing Heat Recovery Systems for Power Generation in Rural AK
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