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Water is directed through an internal cooling loop at a temperature of 60 ̊C and then runs through a heat exchanger. If the heat recovery is not required, a radiator is available to cool the engine. Electrical efficiency of the power units is 30% with 80% efficiency in the total CHP system. Recovered heat in the form of hot water can be used for space heating or in commercial or industrial processes. Picture 19. STM CHP unit. Source: [38] To date, few organizations have produced trial Stirling engines using exhaust from fossil fuel combustors. Those that have been produced are designed to generate less than 200 kW of power, and none of these are commercially available. All recent research related to Stirling engines has been focused on small-sized engines, from less than 2,5 kW (Sunpower, Inc.) to about 100 kW (MTI's ASE engine, Stirling Thermal Motors now STM Power) and more technology-focused companies including Tamin Enterprises, Stirling Technology Co., Whispertech, United Stirling and Stirling Energy Systems. Mechanical Technology Incorporated (MTI) is currently developing a Stirling engine called the Mod III, which could be adapted to use LFG. Currently, no research is underway to develop a larger Stirling engine that could be used in an LFG application (greater than 300 kW). No cost estimates were developed for this report because Stirling Cycle engines are in a conceptual and experimental phase of development for small power output (e.g., 200 kW). Cost predictions at this point would be speculative. Since January 2003, the first successful demonstrations of 2 - 25 kW and 8 - 25 kW Stirling- Cycle engines using landfill gas are operational at two landfills in Michigan. Project costs are 67PDF Image | Landfill Gas Energy Technologies
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