Assertion: engine's efficiency | /r/HasProperty | low
Facets:
value: at idle
type: DEGREE
Source sentences:
text: At idle, the thermal efficiency is low, since the only usable work being drawn off the engine is from the generator.
text: The least efficient, OTEC, uses the temperature difference of ocean water on the surface and ocean water from the depths, a small difference of perhaps 25 degrees Celsius, and so the efficiency must be low.