Search results
Results From The WOW.Com Content Network
Let's find the values of work and heat depicted in the right figure in which a reversible heat engine with a less efficiency is driven as a heat pump by a heat engine with a more efficiency . The definition of the efficiency is η = W / Q h out {\displaystyle \eta =W/Q_{\text{h}}^{\text{out}}} for each engine and the following expressions can ...
This limiting value is called the Carnot cycle efficiency because it is the efficiency of an unattainable, ideal, reversible engine cycle called the Carnot cycle. No device converting heat into mechanical energy, regardless of its construction, can exceed this efficiency.
In modern terms, Carnot's principle may be stated more precisely: The efficiency of a quasi-static or reversible Carnot cycle depends only on the temperatures of the two heat reservoirs, and is the same, whatever the working substance. A Carnot engine operated in this way is the most efficient possible heat engine using those two temperatures.
A Carnot cycle is an ideal thermodynamic cycle proposed by French physicist Sadi Carnot in 1824 and expanded upon by others in the 1830s and 1840s. By Carnot's theorem, it provides an upper limit on the efficiency of any classical thermodynamic engine during the conversion of heat into work, or conversely, the efficiency of a refrigeration system in creating a temperature difference through ...
It is well known that the final temperature is the geometric mean temperature so that the efficiency is the Carnot efficiency for an engine working between and . See also An introduction to endoreversible thermodynamics is given in the thesis by Katharina Wagner. [ 8 ]
Biological thermodynamics (Thermodynamics of biological systems) is a science that explains the nature and general laws of thermodynamic processes occurring in living organisms as nonequilibrium thermodynamic systems that convert the energy of the Sun and food into other types of energy.
Note that a Carnot engine is the most efficient heat engine possible, but not the most efficient device for creating work. Fuel cells, for instance, can theoretically reach much higher efficiencies than a Carnot engine; their energy source is not thermal energy and so their exergy efficiency does not compare them to a Carnot engine. [1] [2]
An equation with two unknowns f 1 and f 2 has to be solved, which is possible with a lot of adequate tuples. As second equation, the physical transformation of product O 1 in O 2 and vice versa is used. O 1 = η 21 · O 2. η 21 is the transformation factor from O 2 into O 1, the inverse 1/η 21 =η 12 describes the backward transformation. A ...