thermal efficiency

The percentage of the heat developed in the burning fuel charge that is actually used to develop power determines thermal efficiency. When fuel is combusted in an engine not all the fuel is converted into power. Some is lost in overcoming friction and some escapes down the tail pipe in the hot exhaust gases so this percentage is always less than 100%. Efficiency will vary according to engine design, use, etc. If an engine uses a great deal of the heat to produce power, its thermal efficiency would be high. Also see adiabatic engine.

Dictionary of automotive terms. 2015.

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  • Thermal efficiency — In thermodynamics, the thermal efficiency (eta {th} ,) is a dimensionless performance measure of a thermal device such as an internal combustion engine, a boiler, or a furnace, for example. The input, Q {in} ,, to the device is heat, or the heat… …   Wikipedia

  • thermal efficiency — šiluminis naudingumo koeficientas statusas T sritis fizika atitikmenys: angl. heat efficiency; thermal efficiency vok. Wärmewirkungsgrad, m rus. тепловой коэффициент полезного действия, m pranc. efficacité thermique, f; rendement thermique, m …   Fizikos terminų žodynas

  • thermal efficiency — šiluminio naudingumo koeficientas statusas T sritis Energetika apibrėžtis Nedimensinis dydis, apibūdinantis šiluminių variklių, verčiančių šilumą darbu, efektyvumą. Tai naudingo darbo, atlikto vieno ciklo metu, ir to paties ciklo metu darbinei… …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • Thermal Efficiency —   A measure of the efficiency of converting a fuel to energy and useful work; useful work and energy output divided by higher heating value of input fuel times 100 (for percent) …   Energy terms

  • Thermal efficiency —   A measure of the efficiency of converting a fuel to energy and useful work; useful work and energy output divided by higher heating value of input fuel times 100 (for percent).   U.S. Dept. of Energy, Energy Information Administration s Energy… …   Energy terms

  • thermal efficiency — noun the efficiency of a heat engine measured by the ratio of the work done by it to the heat supplied to it …   English new terms dictionary

  • thermal efficiency — Thermodynam. the ratio of the work output of a heat engine to the heat input expressed in the same units of energy. [1905 10] * * * …   Universalium

  • thermal efficiency — Смотри коэффициент полезного теплоиспользования …   Энциклопедический словарь по металлургии

  • thermal efficiency — relation between the amount of heat that is preserved to the amount of heat that is wasted …   English contemporary dictionary

  • thermal efficiency — The ratio of the energy produced in the engine to the heat energy released by the fuel in a unit of time …   Aviation dictionary

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