SEM314 Topic 6 - Heat Engine Cycle

SEM314 Topic 6 - Heat Engine Cycle - Topic 6 The typical...

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Deakin University 2003 Topic 6 The typical heat engine cycles Throughout this topic you will need to refer to chapter 5 in your textbook. We are going to discuss some typical heat engine cycles for energy conversion (heat to work). We shall only be concerned with conversion of thermal energy into mechanical energy and the thermal efficiency of such conversion. The heat engine cycles The Carnot cycle The Second Law of Thermodynamics places limitations on the operation of heat engines: refrigerators and heat pumps cannot operate without an input of work and heat engines cannot operate without rejecting heat during a cycle. Carnot’s principle, which deals with a comparison of totally reversible and irreversible heat engines, consists of the following propositions which could be proven with the aid of the Second Law of Thermodynamics: The thermal efficiencies of all reversible heat engines are the same if the engines operate between the same two thermal energy reservoirs. The thermal efficiency of a reversible heat engine is greater than that of an irreversible heat engine when both heat engines operate between the same two thermal energy reservoirs. The reversible heat engine mentioned in Carnot’s principle is only theoretically possible. For the heat engine cycle to be reversible, all processes that make up the heat engine cycle must be totally reversible. This condition would require that the heat transfer to the reversible heat engine from the high temperature reservoir and the heat transfer from the reversible heat engine to the low temperature reservoir take place through infinitesimally small temperature differences. One such reversible heat engine is called a Carnot heat engine and it operates in a cycle that is called the Carnot cycle.
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This note was uploaded on 07/26/2009 for the course ENG sem314 taught by Professor Dunno during the Spring '09 term at A.T. Still University.

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SEM314 Topic 6 - Heat Engine Cycle - Topic 6 The typical...

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