As time permits, I will move the content of my posts in the Manifesto about the vapor compression components of a HP here, and just leave a reference to them in the Manifesto.
A caveat to component compatibility I just learned: Hermetic compressors can't use PAG oil, since it conducts electricity too well and hermetics have their motor inside the case.
Scroll compressors may be more resistant than reciprocating compressors to damage from extreme conditions, especially liquid/foam slugging: refrigerant is drawn through the motor, cooling it more effectively than just being surrounded by the refrigerant in a reciprocating compressor. If liquid tries to enter, the pressure drop caused by the liquid struggling to get through the motor plus the heat of the windings will evaporate it. If any liquid (or debris) makes it into the scroll, the scroll halves can separate slightly, allowing the liquid or debris to pass between to prevent hydrolocking or mechanical damage.
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"I‘d put my money on the sun and solar energy. What a source of power! I hope we don‘t have to
wait until oil and coal run out before we tackle that." Thomas Edison, 1847 — 1931
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