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Keywords:High temperature heat exchanger External firing Immersed structured tube Micro-turbine Biomass CHP Combined heat and power Hot air gas turbine Indirect fired gas turbine Small-scale power production a b s t r a c tThe prevailing demand for decentralized energy supply out of renewable energy sources, such as biomass, requires small-scale CHP technologies. Current developments at the Institute for Energy Systems, Technische Universität München, comprise the biomass fired hot air gas turbine, a fluidized bed wood combustor with integrated high temperature heat exchanger out of structured steel tubes for indirect firing of micro-turbines at 100 kWel. The fluidized bed consists of small particles (<400 mm) and is fluidized at low gas velocities (u < 0.2 m/s), which cause high heat transfer numbers and low tube wall erosion rates.