MTX221 - Thermodynamics: The First Law of Thermodynamics CONTROL MASS summary
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Module
Thermodynamics (MTX221)
Institution
University Of Pretoria (UP)
This document contains information on the first law of thermodynamics and how it is applied to a control mass: liquids, solids, and ideal gases. As well as Transient and Steady-state processes.
MTX
Thermo dynomios Theme )-5
Ihe me 5
FLRST LAW OF THERMOD YNAMICS CoNTROL MASS
Congervation of energy ldw
Mass qong hraugh d cycle
change of stdte.D
Duting ghy cycle whIch o u stem uroerqoej, fne tydial integ rd
OF hegt 1S propor tiong| to the qydical iMteqvd of vwok
8W
N8
Heat gained HedtloJ
SYSFem_ CroSs
boygdry 5yStem
The amount of hod wnith we Work done oh
need to remove JyUem
Cyele onlySo need to der1ve for a PROCEJJ
- ENERGGY
dfS&-w dhdlyses a procelj
tz-E Q W
energy forms
kineti /2mV E KEr PE4
. potentia) mgt
3. internd
But EdfUPE kEOW W
Ingde AE bourdary
Sysfem
, tyos
When CM urderqo d change of S19fe-0nergy may
Is bourdary 2atEP o190
Spocitic energy e ,SpecificKE k y V
M speehic P p: 9
Tnterna energy
extensive properhy (dep. on amcun of mas prejent).
PE KE dlso Qxfensi ve pro per ty.
BUT
Specuic intenal energyinteng Ve property
U U UF 2ph9Se reqion
H:U1 PV
)
Speufic enthdlpy Poperky
Can do interpo/dtjon
hhf+ 2hfq ftun tien
inoor
specific hedty
(onstant Volume pressure
No PhaJe change
HOmogeneous phdse
kE drd PE remdin unchonded.
d 1 dPt Okf , W
E CM
JU PdV
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