Thermodynamic cycle - Revision history

Jmdonev at 19:28, 4 January 2019

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	'''Thermodynamic cycle''' refers to any closed [[system and surrounding\|system]] that undergoes various changes due to temperature, pressure, and volume, however, its final and initial state are equal.<ref>A. Atkins and M. Escudier, A dictionary of mechanical engineering.</ref> This cycle is important as it allows for the continuous process of a moving piston seen in [[heat engine]]s and the expansion/compression of the working fluid in [[refrigerator]]s, for example. Without the cyclical process, a car wouldn't be able to continuously move when fuel is added, or a refrigerator would not be able to stay cold.		<onlyinclude>'''Thermodynamic cycle''' refers to any closed [[system and surrounding\|system]] that undergoes various changes due to temperature, pressure, and volume, however, its final and initial state are equal.</onlyinclude><ref>A. Atkins and M. Escudier, A dictionary of mechanical engineering.</ref> This cycle is important as it allows for the continuous process of a moving piston seen in [[heat engine]]s and the expansion/compression of the working fluid in [[refrigerator]]s, for example. Without the cyclical process, a car wouldn't be able to continuously move when fuel is added, or a refrigerator would not be able to stay cold.

	Visually, any thermodynamic cycle will appear as a closed loop on a [[pressure volume diagram]]. The following are examples of thermodynamic cycles:		Visually, any thermodynamic cycle will appear as a closed loop on a [[pressure volume diagram]]. The following are examples of thermodynamic cycles:

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energy>Jmdonev at 03:07, 13 August 2018

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[[Category:Done 2018-08-03]]
'''Thermodynamic cycle''' refers to any closed [[system and surrounding|system]] that undergoes various changes due to temperature, pressure, and volume, however, its final and initial state are equal.<ref>A. Atkins and M. Escudier, A dictionary of mechanical engineering.</ref> This cycle is important as it allows for the continuous process of a moving piston seen in [[heat engine]]s and the expansion/compression of the working fluid in [[refrigerator]]s, for example. Without the cyclical process, a car wouldn't be able to continuously move when fuel is added, or a refrigerator would not be able to stay cold.

Visually, any thermodynamic cycle will appear as a closed loop on a [[pressure volume diagram]]. The following are examples of thermodynamic cycles:

===Brayton cycle===
::[[Brayton cycle| main page]]

This a thermodynamic cycle used in some heat engines. Notably, it is used for gas turbine engines and some jet engines. The cycle consists of compressing ambient air, mixing the air with fuel, then igniting the mixture, which expands, doing work. In many Brayton cycle engines, the hot air can then be recycled, heating the fresh air coming through.

[[File:Brayton comp no regen.gif|400px|thumb|center|Figure 1. A Brayton cycle with reheating and regeneration. Although it's not on a pressure volume diagram, this exemplifies the concept of the continuous loop, where the final and initial states are the same.<ref>Wiley.com, 2018. [Online]. Available: https://www.wiley.com/college/moran/CL_0471465704_S/user/tutorials/tutorial9/tut9n_content.html. [Accessed: 31- Jul- 2018].</ref>]]

===Otto Cycle===
::[[Otto cycle| main page]]
This cycle describes how [[heat engine]]s turn [[gasoline]] into [[kinetic energy|motion]]. Like other [[thermodynamic cycle]]s, this cycle turns [[chemical energy]] into [[thermal energy]] and then into motion. The Otto cycle describes how [[internal combustion engine]]s (that use gasoline) work, like [[Transportation|automobiles]] and [[lawn mower]]s. Without the cycle, the vehicle would suddenly stop, and wouldn't be able to provide continuous motion.
[[File:P-V_Otto_cycle.png|center|300px|thumb|Figure 2. The [[pressure]]-[[volume]] diagram of an ideal Otto Cycle process. As a thermodynamic cycle there is a loop which the working fluid undergoes. This allows the continuous motion of a four-stroke engine<ref>Wikimedia Commons [Online], Available: https://en.wikipedia.org/wiki/Otto_cycle#/media/File:P-V_Otto_cycle.svg</ref>]]

===Rankine cycle===
::[[Rankine cycle| main page]]
This process is widely used by [[power plant]]s such as [[coal-fired power plant]]s or [[nuclear reactor]]s. In this mechanism, a [[fuel]] is used to produce [[heat]] within a [[boiler]], converting [[water]] into [[steam]] which then expands through a [[turbine]] producing useful [[work]]. The schematic diagram shows there is no 'break' between the steps in a Rankine cycle, and exemplifies the process is a continuous loop.
[[File:Rankinecycle.png|center|420px|thumb|Figure 3. A simple schematic with components for the Rankine Cycle.<ref>Made internally be a member of the Energy Education team, adapted from Energy Systems Engineering by F. Vanek, L. Albright and L. Angenent</ref>]]

==For Further Reading==
*[[Thermodynamics]]
*[[Pressure volume diagram]]
*[[System and surrounding]]
*[[Ideal gas law]]
*Or explore a [[Special:Random|random page]]

==References==
{{reflist}}