Chapter 8



Microturbines are very small gas turbines with sizes as small as 1 kW although the main commercial machines are in the range 30 to 500 kW. These small turbines usually have a single stage compressor and a single stage turbine, with a generator mounted on the same shaft. Both compressor and turbine are normally radial rather than axial in design, as would be the case for their larger relatives. Rotational speed is extremely high, usually greater than 40,000 rev/minutes and power electronics are used to match the output frequency to the grid. Efficiency is low compared to a large gas turbine but many of the more efficient microturbines use recuperators to improve performance. Others use waste heat to produce hot water ...

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