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other words, the system will be capable of generating power in the case of a power outage. A large on-board battery pack is used to power connected loads and start the microturbine. Once the microturbine reaches full speed, the large battery pack is utilized as an electric buffer. In addition to start-up, the battery provides extra power in the case of a sudden load increase, and therefore allows the microturbine time to increase speed to meet the load demand. This battery will also sink power in the case of a sudden load decrease. The stand-alone mode feature of the microturbine should not be confused with an uninterruptible power supply (UPS). The system will only be capable of running small and important building loads, such as lighting. Unlike a UPS, in the case of a power outage, the system will require startup time before it is capable of providing power. Mechanical Engineering Goals It is now possible to access results of the thermodynamic analysis of the microturbine installation remotely from the Web. These data can be used in the undergraduate Thermodynamics classes to illustrate the application of 2nd Law principles to a real installation. Inefficiencies in the system can be pinpointed, and brainstorming sessions on steps to improve efficiencies can be conducted. Comparisons to other methods of electrical and thermal energy generation can be made. The installation site, located 5 miles from the Milwaukee School of Engineering campus, has become an “off-site laboratory”. With the cooperation of the City of Milwaukee, teams of students have traveled to the site to inspect the installation. These site visits, along with access to the Website, have been met with enthusiasm by the students. Progress on Government / Industry Goals Demonstration of Technology The microturbine has now been available for operation through a summer and a winter season. Some lessons already have been learned. Dispatch of the unit on electrical demand has been straightforward. However, dispatch on thermal demand during winter months presented a problem. The heat recovery heat exchanger was designed to bypass exhaust gas flow in order to match the thermal load. However, when control of the unit was attempted through the Metasys building system, it was found that the microturbine itself cycled on and off frequently in response to the Metasys signal. This problem was addressed through adjusting the hot water set points for the Metasys system. In order to achieve the parallel operation agreement with the local utility (WE Energies) it was necessary to pass startup and power quality tests. The unit was initially unable to pass these tests, but after upgrades to some of the equipment the tests were passed. This Proceedings of the 2004 American Society of Engineering Education Annual Conference & Exposition Copyright © 2004, American Society for Engineering EducationPDF Image | A 60-kW Microturbine Demonstration Facility Phase II: Instrumentation, Website Development, and Evaluation
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