Of paramount importance in proposed applications is cold-starting the MT generator at cold weather conditions, nominally -40°C. Bearing tests have been satisfactorily conducted to assess the capability of accomplishing cold-starting with both turbocharger type floating sleeve bearings and for air bearings. Air thrust bearings are normally located behind the impeller and may require increased axial spacing between the compressor and turbine. The primary advantage of air bearings is that neither an oil system nor cooling is required.

Magnetic bearings have been considered for larger aerospace turbogenerators where adequate axial space exists to position both the magnetic and catcher bearings, and low cost is not a driver. Rotor assembly balance is a critical item for small turbomachines, and parts reduction is particularly beneficial in effecting balance sensitivity. Monorotor designs are, therefore, often favored. Magnetic bearings are not considered for MT applications.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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