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Super heated vapor: 6hen the temperatre of the *apor #e hi%her
than the sat' temperatre of this
*apor is "a$$ed sper heated *apor'
egree of super heated : is the differen"e #et!een the sat' tem'
+nd sper heated tem'
7e%ree . 8sp' / 8sat'
Enthalpy of water (hf): is the entha$p2 of heat a#sor#ed #2 nit
mass of !ater at "onstant pressre
nti$ it rea"hes to the tem' 9f *apor formin% from - ";0'
hf . < -8 / 0
8: temp' of *apor formin%'
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!eat of super heated: it is a )antit2 of heat !hi"h added to
satrated *apor in order to "han%e it to
sper heated *apor'
Fsp. hsp/ hset' 5apo
Fsp.
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#he ideal $an%ine "y"le
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Ideal Ranine C!"le on #$ %&iagram
8he idea$ Jan?ine "2"$e dose not
in*o$*es an2 interna$ irre*ersi#i$ities and
"onsists of the fo$$o!in% for pro"esses:
C/> Isentropi" e(pansion in a tr#ine
>/K L.
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Ea"h pro"ess "an &e analyzed using steady flow energy
equation'
E and *E may &e negle"ted+
i'e' hiB F . heB 6
oi$er: hCB F='N'C. hCB 6
6 . & F='N'C. hC/ h=
8r#ine: hCB CF>. h>B C6>
F . & C6>. hC/ h>
B >FK. hKB 6
sin"e 6 . & >FK. / -h>/ hK0
heat reMe"ted in "ondenser . h>/ hK
Lmp: hKB KF=. h=B K6=
F . & K6=. hK/ h= . / -h=/ hK0
6 ? i t t -h h
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6or? inpt to pmp . -h=/ hK
K6=is a sma$$ )antit2 in "omparison !ith C6>' Oen"e& it
is sa$$2 ne%$e"ted -espe"ia$$2 !hen #oi$er pr
are $o!0
Pet !or? don in the "2"$e& 6net. C6>/ K6
6 . -hC/ h>0 / -h=/ hK
or& if the feed pmp !or? -K6=0 is ne%$e"ted
6 . -hC/ h>
8he heat spp$ied in the #oi$er& F='N'C . hC / h=
If the feed pmp !or? -h=/ hK0 is ne%$e"ted
