Turbocompressor and system for a supercritical-fluid cycle

A system, comprising:

• a working fluid;
• a heat source for providing heat to said working fluid;
• and
• a turbocompressor having a central rotational axis and that includes:
• a pair of main bearings spaced from one another along said central rotational axis;
• a rotational shaft rotatably supported by said pair of main bearings so as to be rotatable about said central rotational axis, said rotational shaft having a first end and a second end spaced from said first end along said central rotational axis;
• an axial expansion turbine that includes a rotor located between said pair of main bearings, said rotor including turbine blades coupled to said rotational shaft so as to be rotatable therewith about said central rotational axis, said axial expansion turbine located downstream of said heat source for expanding said process fluid after said process fluid has been heated by said heat source;
• and
• a centrifugal compressor that includes an impeller secured to said first end of said rotational shaft so as to be rotatable therewith about said central rotational axis, said centrifugal compressor located upstream from said heat source for compressing said process fluid before said process fluid is heated by said heat source, wherein a first one of said pair of main bearings is located between said impeller and said rotor such that said impeller is cantilevered from said first main bearing.