www.newthermodynamics.com

Blog: Work onto the Surroundings

A New Thermodynamics

By Kent W. Mayhew

Work onto Surroundings : Another Traditional Boondoggle 

It should be stated that there are those who realize that work as defined by W=PdV is work done onto the surroundings! But they all seem to fail to realize that this is Lost work i.e. W=(PdV)atm= PatmdVsys is irrreversible work! 

Examples of those that realize W=PdV is done onto the surroundings

      1)http://www.SFU.ca/~MBahrami/ENSC%20388/notes/first%20law%20of%20thermodynamics_closed%20Systems.PDF

 

 It is particularly interesting that books (1,2) on atmospheric physics tend to discuss how an expanding system and its surroundings are in mechanical equilibrium, and how work done is due to this mechanical equilibrium hence is defined by W=PdV . The most precise example being from the book "Encyclopedia of Atmosphere.." (3) where they write:

 "The type of work of primary importance in the atmosphere is expansion work which is defined as:

      dw=-pdv      (1)

 where dv is the differential volume change associated with the work done against the external pressure."

Again they all fail to realize that this is lost work and all that this means!

Of course the total work is the found by integrating eqn and for lost work which is an exact differential (path independent work we have Wlost= (PdV)atm=PatmdVsys

  

References:

1) Editors: Julio V. Iribarne and W.L. Godson  book "Atmospheric Physics" Springer Science  & Business Media 1981

2) Slaby, Murray L. "Physics of the Atmopshere and Climate" Cambridge University Press 2012  

3) Editors. North, Gerald R., Pyle, John A., Zhang Fuqing book" Encyclopedia of atmospheric Sciences Vol 1-6" Elsever Press  2014

 

 

thermowebsite2061016.jpg thermowebsite2061013.jpg thermowebsite2061011.jpg thermowebsite2061008.jpg thermowebsite2061007.jpg thermowebsite2061006.jpg thermowebsite2061004.jpg
Help support this site
thermowebsite2061002.jpg
This website is copyright of Kent W. Mayhew who in 2018 resides in Ottawa Ontario Canada
 
   This website is full of new ideas, which are the property of Kent W. Mayhew.  
 
    Furthermore you are free to share, copy or distribute in any manner that you feel is warranted, so long as you fully respectfully reference the author (Kent W. Mayhew) in a manner that you deem fit.