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2019 | OriginalPaper | Chapter

9. Process Values Heat and Work

Author : Achim Schmidt

Published in: Technical Thermodynamics for Engineers

Publisher: Springer International Publishing

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Abstract

Over the previous chapters the internal state of a system has been described. A thermodynamic system can change its state and several possible changes of state have been discussed. For the further understanding it is essential to be familiar with the terms reversibility/irreversibility as well as with the idea of a quasi-static change of state. These approaches have been clarified in the previous Chaps. 7 and 8: By external impacts a system’s thermodynamic equilibrium can be disturbed and the system moves into a new balanced state.

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previous chapter Thermodynamic Processes
next chapter State Value Versus Process Value
Footnotes
1
Just imagine a gas-turbine in steady state: It does not release a single portion of heat, but it releases heat permanently.
 
2
In fact, this will be an applicable approach for the work later on as well!
 
3
Remember that the sign convention is always from the system’s perspective!
 
4
In case of steady state!
 
5
A detailed explanation will follow in Sect. 11.​3.​4!
 
6
Sir George Gabriel Stokes (\(*\)13 August 1819 in Skreen, County Sligo, \(\dagger \)1 February 1903 in Cambridge).
 
7
Isochoric change of state!
 
8
However, though the outer atmosphere might expand or might be compressed, the ambient pressure is supposed to be constant due to its large size.
 
9
For this section the knowledge of first law of thermodynamic is required!
 
10
See Sect. 13.​5.
 
11
I.e. kinetic and potential energies!
 
12
A solid is supposed to be incompressible, so that there is no distinction between \(c_{v}\) and \(c_{p}\), see Sect. 12.​4.​2.
 
13
The following equations will be introduced and explained in Chap. 11ff!
 
14
According to Example 7.​24 the requirements for an isobaric change of state are fulfilled!
 
15
The piston’s potential energy decrease!
 
Metadata
Title
Process Values HeatHeat and WorkWork
Author
Achim Schmidt
Copyright Year
2019
Book
Technical Thermodynamics for Engineers

Print ISBN: 978-3-030-20396-2

Electronic ISBN: 978-3-030-20397-9

Copyright Year: 2019

DOI
https://doi.org/10.1007/978-3-030-20397-9_9

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