A **thermodynamic cycle** consists of a collection of thermodynamic processes transferring heat and work, while varying pressure, temperature, and other state variables, eventually returning a system to its initial state. In the process of going through this cycle, the system may perform work on its surroundings, therefore acting as a heat engine.

State quantities depend only on the thermodynamic state, and cumulative variation of such properties adds up to zero during a cycle. Process quantities (or path quantities), such as heat and work are process dependent, and cumulative heat and work are non-zero. Since the change in internal energy (a state quantity) over the course of a cycle is zero, the first law of thermodynamics dictates that the net heat input is equal to the net work output over a cycle. The repeating nature of the process path allows for continuous operation, making the cycle an important concept in thermodynamics. Thermodynamic cycles are often represented mathematically as quasistatic processes to model the workings of an actual device.

Read more about Thermodynamic Cycle: Heat and Work, Modelling Real Systems, Well-known Thermodynamic Cycles, State Functions and Entropy

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**Thermodynamic Cycle**- State Functions and Entropy

... If Z is a state function then the balance of Z remains unchanged during a cyclic process ... Entropy is a state function and is defined as so that , then it is clear that for any cyclic process, meaning that the net entropy change over a cycle is 0 ...

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**Thermodynamic Cycle**

... The

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**cycle**, and can be described at a starting point whereby the chosen working substance is introduced into a magnetic field, i.e ... not lost (yet) and therefore total entropy is not reduced (according to

**thermodynamic**laws), the net result is that the item heats up (T + ΔTad) ... Once the refrigerant and refrigerated environment are in thermal equilibrium, the

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### Famous quotes containing the word cycle:

“The Buddha, the Godhead, resides quite as comfortably in the circuits of a digital computer or the gears of a *cycle* transmission as he does at the top of a mountain or in the petals of a flower.”

—Robert M. Pirsig (b. 1928)