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Power Plant TechnologyMENG 4662

1

Mohy S. MansourProfessor,

Mechanical Engineering Department

AUC

Mohy Mansour - AUC

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Power Plant

2

POWERCYCES

Mohy Mansour - AUC

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Types

Mohy Mansour - AUC3

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Heat Engines

Efficiency = Power/Heat ae

5

Heat Added

Mo

hyMansour-AUC

Heat

Engine

Heat Rejected

QoA

QoR

Power

Wo

TH

TL

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Reversed yc!e

Coefficient of Performance = Heat/Power

"

Heat Rejected

Mo

hyMansour-AUC

Re#rigerator

orHeat P$%p

Heat A&sor&ed

QoH

QoL

Power

Wo

TH

TL

7/23/2019 MENG4662 Chapter 2 Rankine Cycle

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Mo

hyMansour-AUC

E(terna! o%&$stionEngines

)nterna! o%&$stionEngines

Heat Engines

*tea% Power

P!antRotary Reciprocating

+asT$r&ine Petro!,

*)-iese!,

)

Wan.e!Engine

Ran.ine yc!e

/raytonyc!e

0ttoyc!e

-iese!yc!e

-$a!

yc!e

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Ran.ine yc!e

MohyMans

our-AUC

*tea%

+enerator/oi!er

T$r&ine

ondenserP$%p

Heat Added,Qo/

T$r&inePower

WoT

HeatRejected,QoP$%p Power, W

oP

*tea%,%o

Water, %o

%o

%o

%o

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Ran.ine yc!e

MohyMans

our-AUC

yc!e P$%p 12

Adia&atic Reversi&!e 6 )sentropic /oi!er 23

onstant Press$re Heat Added

T$r&ine 34

Adia&atic Reversi&!e 6 )sentropic ondenser 41

onstant Press$re Heat Rejected

T

*

*tea%+enerator

/oi!er

T$r&ine

ondenserP$%p

HeatAdded,Qo/

T$r&inePower

WoT

P$%p Power,WoP

*tea%,%o

Water, %o

%o

%o

%o

HeatRejected, Qo

1

2

3

4

P

P/

1

2

3

4

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Ran.ine yc!e

yc!e Ana!ysis

P$%p 12

!ater enters the pump at state " as saturate li#ui an iscompresse isentropically to the operating pressure of the

$oiler%

&he pump follows the '''( process, then

Q7 W7 6 %7 8 9:2; :1 < 9V22; V1

2< =2 g9>2 >1

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Ran.ine yc!e

yc!e Ana!ysis

P$%p 12

) = * an +inetic an potential energies are neglecte, then

* - ! = m 8h. h" 0 1 * 1 *0?

!P= m h" h. 0 +!

wP= h" h. +2/+g

&his e#uation is use to etermine h.if wP is +nown% 3therwiseh.is calculate as,

(rom 4 5 constant 6ncompressi$le0

wp= -4 P

7 P

C0 = -4 P

. P

"0 +2/+g

then h.= h"1 4"p. p"0 +2/+g11

MohyMans

our-AUC

*tea%+enerator

/oi!er

T$r&ine

ondenserP$%p

HeatAdded,Qo/

T$r&inePower

WoT

P$%p Power,WoP

*tea%,%o

Water, %o

%o

%o

%o

HeatRejected, Qo1

2

3

4

=2

1

vdpwP

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Ran.ine yc!e

yc!e Ana!ysis

/oi!er 9*tea% +enerator< 23

!ater enters the $oiler as compresse li#ui at state . anlea4es as saturate or superheate 4apor at state 8% &he $oiler

follows the '''( process, then

)7- ! = m 8h8 h. 0 1 V8. V.

.0 /. 1 g98 9.0?

:o wor+ an +inetic an potential energies are neglecte, then

)7- ! = m 8h8 h. 0 1 * 1 *0?

)7= m h8 h. 0 +!

#7= h8 h. +2/+g

12

MohyMans

our-AUC

*tea%+enerator

/oi!er

T$r&ine

ondenserP$%p

HeatAdded,Qo/

T$r&inePower

WoT

P$%p Power,WoP

*tea%,%o

Water, %o

%o

%o

%o

HeatRejected, Qo1

2

3

4

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Ran.ine yc!e

yc!e Ana!ysis

T$r&ine 34

&he superheate 4apor at state 8 enters the tur$ine, where ite;pans isentropically an prouces wor+ $y rotating the shaft

connecte to an electric generator% &he tur$ine follows the

'''( process, then

) - !&= m 8h

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Ran.ine yc!e

yc!e Ana!ysis

ondenser 41

'team is conense at constant pressure in the conenser,&he conenser follows the '''( process, then

)C- ! = m 8h" h< 0 1 V". V