Talk:Thermodynamic cycle

message: Can whomever placed the reference to Manson-Guise cycle in the table create a good article on the Manson cycle? Without this, the line appears as a buried advertisement to your cute engine. The Manson-Guise article has no diagrams to explain how it works; shows evidence of advertisement based article.  — Preceding unsigned comment added by 73.34.109.242 (talk) 13:32, 11 November 2018 (UTC)
thread_title:  Manson and Manson-Guise cycle in table of processes 

message: Does anyone know the name of the gravity based cycle used in things like solar chimneys, thunderstorms and very large airconditioning systems?  The cycle heats a gas at a constant pressure, expands the gas in a tall chimney (i.e. hundreds of meters tall), cools at a constant pressure and compresses down another tall chimney.  I read a paper on it years ago and I can't find any references to it now. njh 00:37, 28 January 2006 (UTC)
thread_title:  Gravity chimney based cycle 

message: There is a severe failure in this article
The integral (integral( dQ/T))over a hole cycle is only zero if it is an ideal cycle but for any other cycle the so called Clausius inequality is true!! where the Integral is smaller or equal zero!  —Preceding unsigned comment added by 83.27.25.158 (talk) 11:05, 8 January 2008 (UTC)
thread_title:  Entropy equation untrue!! 

message: I removed the 'Demonstration' section which was a highly confusing 'demonstration' that the delta S over a cycle is zero. Looked like it was copied from a textbook or course notes.Cerireid (talk) 20:04, 14 August 2008 (UTC)
thread_title:  Removed material 

message: This page says that the Stoddard cycle has 4 stages: adiabatic, isometric, adiabatic, isometric.  But the Stoddard engine page says this cycle is adiabatic, *isobaric*, adiabatic, *isobaric*.  Can some expert fix the page that's wrong?
Stoddard's 1933 patent --- you can see it on the Stoddard engine page --- says: "It is to be noted that the increase in pressure at the end of the up stroke of the piston is due to the rise in temperature and not to mechanical work".  That sounds like an isometric stage, not an isobaric one.  John Baez (talk) 17:42, 13 February 2010 (UTC)
thread_title:  Help!  I'm confused about the Stoddard cycle! 

message: Why is it this cycle that is chosen to be ideal:  that is, what about it is 'ideal'?
(There is no 'ideal cycle' article, which suggests that it is not all that notable).
86.3.108.41 (talk) 15:30, 28 September 2011 (UTC)
thread_title:  Ideal cycle 

message: ===Ideal cycle===
thumb|left|190px|An illustration of an ideal cycle heat engine (arrows clockwise).
This cycle is great for first year physics classes, and among physics teachers is possibly second only to the Carnot cycle in importance.  The problem lies in the parallel nature of two articles Heat engine and Thermodynamic_cycle.  I found the former article but not the latter and for that reason failed to find the figure to the left.  That forced me to make the figure to the right. The proposed page would carefully explain why the area equals the work done, how to interpret the isotherms, and how heat engines establish that work and heat are not state variables. If the Ideal Cycle had its own page we could enter it in this list of heat engines: https://en.wikipedia.org/wiki/Heat_engine#Gas-only_cycles. --guyvan52 (talk) 23:33, 15 December 2013 (UTC)
thread_title:  Nomination of page for Ideal Cycle 

message: thumb|left|190px|An illustration of an ideal cycle heat engine (arrows clockwise).
This cycle is great for first year physics classes, and among physics teachers is possibly second only to the Carnot cycle in importance.  The problem lies in the parallel nature of two articles Heat engine and Thermodynamic_cycle.  I found the former article but not the latter and for that reason failed to find the figure to the left.  That forced me to make the figure to the right. The proposed page would carefully explain why the area equals the work done, how to interpret the isotherms, and how heat engines establish that work and heat are not state variables. If the Ideal Cycle had its own page we could enter it in this list of heat engines: https://en.wikipedia.org/wiki/Heat_engine#Gas-only_cycles. --guyvan52 (talk) 23:33, 15 December 2013 (UTC)
thread_title: Ideal cycle

message: I noticed the curved lines on the P-V diagram are not labeled and appear to not lie as I would expect. If the curved lines are constant temperature they should appear to run asymptotic to the P and V axis'. I'm not sure how the lines of constant entropy should lie but should probably appear nearly asymptotic to those axis' also. They are only sketches but the lines of constant this or that might be labeled as such. I need to pick up the skill to create such diagrams and other sketches.Zedshort (talk) 19:20, 18 January 2014 (UTC)
thread_title:  P-V Diagrams look odd 

message: Under item 1.3	"A list of thermodynamic processes", 
   under Isothermal, the last sentence "Energy transfer is considered as heat removed from or work done by the system." does not relate the heat transferred and the work associated with the process - the net energy (the sum) of heat and work is zero - the linked article on Isothermal says it much better.
   under Isochroic, "Energy transfer is considered as heat removed from or work done by the system." - there is no change in volume so no work involved - again, the linked Isochroic article gets it right.
    under Isentropic, "no physical work is done by/to the system."  Again, the linked isentropic article gets it right.  An isentropic process is an adiabatic process with the additional requirement that the process is isentropic (no increase in entropy thus an isentropic process is reversible)   108.51.46.68 (talk) 04:29, 17 November 2020 (UTC)
thread_title:  Problems with accurately describing heat iin the listed thermodynamic processes  (1.3 A list of thermo...._ 

message: The ideal Atkinson cycle is actually a combination of isochoric heat addition with isobaric heat rejection.  Atkinson-cycle exhaust volume is greater than intake volume, so describing heat rejection as "isochoric" is clearly inaccurate.  In actual Atkinson engines, expansion is truncated before reaching actual isobaric conditions due to engine friction.   Since the Atkinson cycle is actually the isentropic-isochoric-isentropic-isobaric thermodynamic cycle, there is no distinct "Humphrey Cycle".  So, unless Humphrey predated Atkinson (1882), that listing is out of place in this article.  — Preceding unsigned comment added by 198.208.46.93 (talk) 13:02, 6 June 2022 (UTC)
thread_title:  Atkinson Cycle