The present invention relates to a coiled pipe in pipe recuperator (1, fig. 1) incorporating a micro gas turbine engine within its central void. The gas turbine engine may further comprise a compressor stage 16, a turbine stage, a bearing platform 19, a generator 25, control electronics 26 and an inverter. The gas turbine engine may further comprise a centrifugal compressor impeller 17, a centrifugal turbine impeller 21, and a generator shaft connected by a common shaft (56, fig. 8) supported by an automotive oil cooled journal bearing platform. The gas turbine engine may further comprise a combustion chamber 24 with ignition source, a compressor shroud 16, a turbine shroud 23 and electronic circuitry. There may be two or more compressor stages. There may be two or more turbine stages. A heat shield 22 may be incorporated behind the turbine and against the bearing platform.
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