8.1 Energy degradation and power generation

Objective 1

Assessment Statement
8.1.1 The concept of thermal energy maybe completely converted to work in a single process. But that continuous conversion of this energy into work requires a cyclical process and some transfer of energy from the system.

The concept above relates strongly with the second law of thermodynamics, in order for stronger understanding, it is necessary to note that there are numerous versions of the law itself, the third version of the law by law Kelvin, is the heat engine formulation, or the Kelvin statement says,

“It is impossible to convert heat completely into work in a cyclic process.”

(This version of the second law of thermodynamics is the closest and best explains the statement above)

That is, it is physically impossible to extract energy by heat from a higher temperature and completely convert all of the energy into work. In other words, at least some of the energy will flow to a lower temperature energy sink. Therefore, it can be concluded that a heat engine with 100 % efficiency is thermodynamically impossible.

For an example for a diesel cycle, click on the following link:
Diesel Cycle -- thermodynamics

Anonymous. "Second Law of Thermodynamics." Second Law of Thermodynamics. Allabout science. 18 Mar. 2009.

Anonymous. "Specific Closed-Process Cycle Daemons: Select Working Fluid Model." Specific Closed-Process Cycle Daemons: Select Working Fluid Model. Daemons. 18 Mar. 2009.