inlet chilling vs. no chilling, evap cooling, & inlet fogging
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To Inlet Condition a Gas Turbine orNot, That is the Question
&Discussion on Plant Performance
Testing
By,
Gary Bush & Azim JivanBush Power Group LLC.
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Topics covered
Opions !or in"e air condiionin#
$eaher Pro!i"e
Thermodynamic %ode"
Per!ormance Ana"ysis
conomic Ana"ysis
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$hy 'n"e Air Condiion(
One o! he many opions avai"a)"e !or
increasin# oupu o! a Power P"an
Oher Opions !or Boosin# Power are*
+upp"emenary !irin# in he -G
+$aer or eam 'n/ecion !or Power
Au#menaion+Pea0 1irin#
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Opions !or 'n"e Air
Condiionin# vaporaive Coo"in#*
educin# he emperaure o! he air sream hrou#h waer
evaporaion. ner#y is drawn !rom he air sream o conver
waer !rom "i2uid o vapor. This resu"s in a more dense and
humid air. The emperaure drop is "imied )y we )u")
emperaure.
Types o! vaporaive Coo"in# are*
+vaporaive Coo"er 3weed4honeycom) medium5
+1o##in# 3sprayin# o! u"ra4!ine mis5
+Oversprayin# 3vaporaive 'nercoo"in#5
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Opions !or 'n"e Air
Condiionin# 3cond.5 'n"e Air Chi""in#*
Coo"s he air o emperaures "ower han he we
)u") emperaure. $hen co"d air reaches sauraionpoin hen waer sars o condense !rom he air
sream.
Types o! 'n"e Chi""in# are*
+6irec Chi""ers 3%echanica" and A)sorpion ypes5
+Therma" ora#e 3Creae ice in o!!4pea0 hours o chi""air durin# pea0 hours5
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ome Pros and Cons
vaporaive Coo"in#
+ Pros*
Low parasiic "oads Lower cos han chi""ers
+ Cons* Coo"in# "imied )y we
)u") emperaure ande!!eciveness o! coo"in#
!or he ype se"eced
'n"e Chi""in#
+ Pros*
Coo"in# is no "imied )y we)u") emperaure. Air can )e
coo"ed down o 78 de#1 and
98: -.
Can provide a consan hi#h
p"an capaciy
+ Cons* -i#h parasiic "oads
-i#her cos han evaporaive
coo"in# opions
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$eaher Pro!i"e
One o! he si#ni!ican iems o! in!ormaion
re2uired !or eva"uaion is he weaher pro!i"e o! he
power p"an "ocaion. The weaher pro!i"e provides )ins wih dry )u")
emperaure, coinciden re"aive humidiy or we
)u") and he correspondin# annua" num)er o!
hours a he #iven emperaure ran#e.
-e"ps o deermine he am)ien desi#n condiions
!or he p"an
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$eaher Pro!i"e !or -ouson3Coinciden e"aive -umidiy5
Houston, TX. Annual Temperature Profile with Coincident Relative Humidity
(Data from ational Climatic Data Center!
30
5
!0"
!#"
$05$3!
3!%
3535
50
%
5#3
!
5!!
3$
3"0
33
3!0
$#5$"
$5#$5#
$3!$!3$05
!"#!#0!!
!35!!#
%!
5##3"30
!$!$
$5
%5$
55%
5"
#!#
#""!"!"$
#%#%"0#"######"#"#"#"#"###"#%
"3"!
"5""3"$"$"!
0
!
$
3
5
#
%#%5%3%!"%"#"5"3"!#%###5#3#!%#53!5%5#55535!%#53!3%3#35333!$%$#$5$3
Am"ient Dry #ul" Temperature, $
0
!0
$0
30
0
50
0
#0
"0
%0
!00
CoincidentRelativeHumidity(%!
'ours()r
Coincident *'
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$eaher Pro!i"e !or -ouson3Coinciden $e Bu")5
Houston, TX. Annual Temperature Profile with Coincident &et #ul"
(Data from ational Climatic Data Center!
30
5
!0"
!#"
$05
$3!
3!%
3&535&
&50
&%&
5#3
!
5!!
&3$
3"0
33
3!0
$#5$"&
$5#$5#
$3!$!3
$05!"#
!#0!!
!35!!#
%!
5
3"30
!$!$
#"#########5##$
#!%
#5
3!
5%5#
5553
5!&%
&
&&&$
&03"
335
333!$%
$#$5
$&$$
0
!
$
3
&
5
#
%#%5%3%!"%"#"5"3"!#%###5#3#!%#53!5%5#55535!&%&5&3&!3%3#35333!$%$#$5$3
Am"ient Dry #ul" Temperature, $
0
!0
$0
30
&0
50
0
#0
"0
%0
!00
Coin
cident&et#ul",
de'$
'ours()r
Coincident +et ,ulb
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Thermodynamic %ode"
The hermodynamic mode" is creaed usin#
GTPro and GT%aser so!ware !rom
Thermo!"ow. GTPro is used o desi#n he p"an a he
se"eced desi#n condiions
GT%aser is used o simu"ae per!ormanceo! he p"an a o!!4desi#n condiions
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'n"e Condiionin# Opions
va"uaed vaporaive Coo"in#
+ 3;8: !!eciveness. Add O o GT 'n"e Losses5
1o##in#+ 398: !!eciveness. ?"ra !ine drop"es. Add @.8=->O o GT 'n"e
Losses5
'n"e Air Chi""in#+ 3"ecric Chi""er wih is own Aui"iary Coo"in# Tower. ized o
coo" in"e air o 8@ de#1. Add O o GT 'n"e Losses5
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Assumpions
A"" mode"s creaed !or #reen!ie"d insa""aion.
The -G, eam Tur)ine and he Coo"in#
ysem are sized !or he #iven in"e aircondiionin# opion
A"" per!ormances are !or new and c"ean p"an.
1ue" used is mehane on"y. o supp"emenary !irin# in he -G
P"an runnin# a )ase"oad
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P"an Con!i#uraion
Com)ined Cyc"e*
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P"an Con!i#uraion cond.
$e %echanica" dra! Coo"in# Tower
1ue" o he #as ur)ine heaed o DE8 de#1.
6esi#n Condiions are D de#136B5,E;.;de#1 3$B5, ;
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GT -./T* !01% .2im i4an
!3# 0!!"$003 !#606$$ file7C68-) D9C:-NT/8.;I-8PG8./-8T'*-9
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GT -./T* !01% .2im i4an
!3# 0!!"$003 !#60563# file7C68-H Documents8.2im8PG8./-8Thermoflo>8CC >ithout P.C8G#er $#5"# ?+='@ 'eat *ate $0 T:(?+h
ABAsia, TB /TQ:I
!E G #$!
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GT -./T* !01% .2im i4an
!3# 0!!"$003 !#606! file7C68-H Documents8.2im8PG8./-8Thermoflo>8CC >ithout P.C8G#
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GT -./T* !01% .2im i4an
!3# 0!$0$003 0%60$6!" file7C6 8-) D9C111#
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Per!ormance Ana"ysis
P"an oupu is he main economic !acor
durin# pea0 power demand period
P"an e!!iciency is he main economic !acordurin# non4pea0 periods
Thus need o eva"uae cumu"aive
per!ormance and economic reurns over awide ran#e o! emperaures raher han desi#n
and hi#h am)ien emperaures
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Per!ormance Ana"ysis cond.
imu"ae he per!ormance o! he p"an wih
di!!eren in"e air coo"in# opions a each
emperaure )in shown on he annua"weaher pro!i"e
Ca"cu"ae he %e#awa hours, 1ue" and
$aer Consumpion !or each emperaure)in o #e he annua" cumu"aive oa"s
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Compressor nlet Temperature vs. Am"ient Temperature for Different nlet Air Coolin'
)ptions
(#ase Case has o nlet Air Conditionin'!
$0
30
0
50
0
#0
"0
%0
!00
$0 30 0 50 0 #0 "0 %0 !00
Am"ient Temp
de'$
4aA1 Cooling
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et Power vs. Am"ient Temperature for Different nlet Air Coolin' )ptions
(#ase Case has o nlet Air Conditionin'!
$$0,000
$30,000
$0,000
$50,000
$0,000
$#0,000
$"0,000
$0 30 0 50 0 #0 "0 %0 !00
Am"ient Temp
*&
4aA1 Cooling
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Comparison of $uel Consumption vs. #ase Case for Different nlet Air Coolin' )ptions
(#ase Case has o nlet Air Conditionin'!
01%"
!100
!10$
!10
!10
!10"
!1!0
!1!$
!1!
$0 30 0 50 0 #0 "0 %0 !00
Am"ient Temp
4aA1 Cooling
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Heat Rate vs. Am"ient Temperature for Different nlet Air Coolin' )ptions
(#ase Case has o nlet Air Conditionin'!
,$$0
,$0
,$0
,$"0
,300
,3$0
,30
,30
,3"0
,00
,$0
$0 30 0 50 0 #0 "0 %0 !00
Am"ient Temp
#tu+*&h(,
H-!
4aA1 Cooling
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Plant Auiliary oad plus Transformer osses vs. Am"ient Temperature for Different nlet Air
Coolin' )ptions
(#ase Case has o nlet Air Conditionin'!
,000
5,000
,000
#,000
",000
%,000
!0,000
!!,000
$0 30 0 50 0 #0 "0 %0 !00
Am"ient Temp
*&
4aA1 Cooling
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Difference of Pota"le /a*eup &ater $low from the #ase Case vs. Am"ient Temperature for
Different nlet Air Conditionin' )ptions
(#ase Case has o nlet Air Conditionin'!
5
0
5
!0
!5
$0
$5
30
$0 30 0 50 0 #0 "0 %0 !00
Am"ient Temp
*pph
4aA1 Cooling
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Difference of /e'awatt Hours from the #ase Case vs. Am"ient Temperature for Different nlet
Air Conditionin' )ptions
(#ase Case has o nlet Air Conditionin'!
!000
0
!000
$000
3000
000
5000
000
#000
$0 30 0 50 0 #0 "0 %0 !00
Am"ient Temp
/e'awattH
ours
4aA1 Cooling
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conomic Ana"ysis
"ecriciy rae srucure
1ue" cos srucure
$aer cos
O&% Coss
Capaciy Paymens
6e#radaion o! he p"an
Ta 'mp"icaions
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Assumpions made !or curren
conomic Ana"ysis* "ecriciy ae rucure*
J(-+h TemAerature range
J"0 %0< and abo4e
J50 "0< %0
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