Wikipedia
In thermodynamics, the thermal efficiency (η ) is a dimensionless performance measure of a device that uses thermal energy, such as an internal combustion engine, a steam turbine or a steam engine, a boiler, a furnace, or a refrigerator for example. For a power cycle, thermal efficiency indicates the extent to which the energy added by heat is converted to net work output. In the case of a refrigeration or heat pump cycle, thermal efficiency indicates the extent to which the energy added by work is converted to net heat output.
Usage examples of "thermal efficiency".
The cartridge was consumed in use for excellent thermal efficiency, leaving no empty case.
The maximum sustainable horsepower is the product of the combustion rate (the number of pounds of coal burned per hour), the energy value of the coal (BTUs per pound), the combined thermal efficiency of the boiler and engine (typically 0.
One does not want it to freeze on one's body, but, even more dangerously, one does not wish one's furs to become wet and then freeze, thus robbing them of their thermal efficiency and, indeed, increasing the likelihood of a break or tear in the hides.
It's about airtight, and the thermal efficiency is seven, eight times the best fireplace.