. . . . . . . . . . . . . "http://dbpedia.org/resource/Thermal_efficiency"^^ . . "Thermal Efficiency"@en . . "Thermal efficiency is a dimensionless performance measure of a thermal device such as an internal combustion engine, a boiler, or a furnace. The input to the device is heat, or the heat-content of a fuel that is consumed. The desired output is mechanical work, or heat, or possibly both." . . "http://www.iso.org/iso/catalogue_detail?csnumber=31890"^^ . .