22-25 Vapour Absorption System

8/20/2019 22-25 Vapour Absorption System

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!"# $%&

'()*+,(*-.+/0 2 3+* 4/05+.+/0+0,Amit Arora

Assistant Professor

Department of Mechanical Engineering

NCU, Gurgaon

!"#$%& '()*+$,

-./&+0.&"*+$, )2)*.3) 4!'-56


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!"#$%& ()*$+,$- ./0&,1/&"+,$-• '(4-667 - *()*+,(*-.+/0 898.(: !"# %& '&(#)*+ +,%+-(". +(+-/0 ./ 4*(-.(

.(:;(*-.-0 .>/8( (?+8.+0, +0 .>( 8+4> 4/08+,> ,*-5(C (0(*,9

– 1&%+G H+,> ,*-5( (0(*,9 +8 -6=-98 (?;(08+I( .>-0 .>( 6/= ,*-5( (0(*,9

• That’s why a VARS is also called ‘Heat operated refrigerator’

• J>-. +8 )


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• 38 -6*(-59 8.-.(57 @3'A 5/(8 0/. 4/08-. - @-;/


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2,3#4/ !(.2• T


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• #/= ;*(88( =(-E -P8/*P(0. 8/6


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• 3P8/*;.+/0 /) UHV I-;/( =-.(* 86+,>.69 *(5( ;*(88(

-P8/*P(*7 .>(*(P9 5*-=8 :/*( UHV I-;/


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• L>( 8.*/0, 8/6( -P8/*P(* +8 ;(-.(5

– H(-.+0, +0 .>( ,(0(*-./* +0I/6I(8 4/08(-.+0,7 UHV I-;/( ,(0(*-./* ,(. 8(;-*-.(5 6(-I+0, P(>+05

=(-E 8/6+4> +8 8(0. P-4E ./ .>( -P8/*P(* .>*/ - ]'@

– Generator is also called ‘desorber’ or ‘reboiler’


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• H+,> ;*(88(0 >+,> ;*(88


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Thermalcompressor

• Can you now answer….

• J>/ ;(*)/*:8 .>( .-8E /) .>( :(4>-0+4-6 4/:;*(88/* K

• F/:P+0(5 /;(*-.+/0 /) -0 -P8/*P(*7 - ;


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• 7(#4/!%8

• T/* 8-:( ;*(88(04( :-9 P( (-8+69 0(,6(4.(5 5(

-0-698+8

L>


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5&"6+,6"4 !(.2• A+:;6( @3'A 4/:;*+8( /) .>( 4/:;/0(0.8 =>+4> -*( P-*( :+0+:-6 *(M( 898.(: )/* ;*/569


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• Limitations of Simple VARS …..

XW A+:;6( @3'A *(M+,> -:/(-. 8( ,(0(*-./*

– _( 6/= .(:;(*-.( 8.*/0, -P8/*P(0. 8/6(,(0(*-./* B.>-. +8 4/:+0, )*/: .>( -P8/*P(*C

ZW A+:;6( @3'A *(M+,> -:/(-. *(:/I-6 +0 .>( -P8/*P(*

– _+,> .(:;(*-.( =(-E -P8/*P(0. 8/6( -P8/*P(*

B.>-. +8 4/:+0, )*/: .>( ,(0(*-./*C


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VW H+,> ;*(88


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• J>-. :/5+)+4-.+/08 8>/( (4/0/:9 /) /;(*-.+/0 -05 :-E( .>(

898.(: *(6+-P6( K

• H(-. 8( ,(0(*-./* 2 >(-. *(:/I-6 +0

.>( -P8/*P(* 4-0 P( (4/0/:+S(5 P9 +08.-66+0, -

#+M(-. .>( 8.*/0, 8/6(

,(0(*-./*

– A -0 -**-0,(:(0. =+66 *(5( >(-.

8( ,(0(*-./* -05 >(-. *(:/I(5 +0

.>( -P8/*P(*

– L>( /;(*-.+/0


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• O0 )-4.7 (4/0/:9 4-0 P( +:;*/I(5

further ….

– L>+8 +:;*/I(:(0. +8 0/. *(6-.(5 ./ .>(

/;(*-.+/0 /) -P8/*P(* 2 ,(0(*-./*

• F-0 9/< ,


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• Now the only issue left is reliable operation of the system …

– L*-4(8 /) .>( :/+8.( >+,> ;*(88


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9( "(".0#+- +8 - 4/6/+4> -*( :(-0. ./

8+,0+)+4-0.69 +04*(-8( .>( 8( 6+M( 6+M( 8.*/0, -P8/*P(0. 8/6( ./; .>-. )6/=8

6-.(*-669 /I(* .>( .*-98 P()/*( )-66+0, +0 .>( ,(0(*-./*

#+M 6-*,( 8( *(8+8 +0.(*-4.+/0 K

H(-. (?4>-0,( PQ= .>( 5(84(05+0, B4/65C 6+M/.C UHV I-;/(

4/05(08-.+/0 /) :/+8.


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309 6(). /


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7(#4/!%8

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UHV I-;/(-. (?4>-0,(


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• ='!+*"%4' 34"/-"* &; 6-"'%4'". >9?= 24%! ".. ;&)- *&34;4'"%4&(#

BXC #\# H` BZC #\@ H` BVC 30-698(* B$C _(>95*-./* B*(4.+)+(*C

• Fd] /) ;*-4.+4-6 @3'A +8 (?;*(88(5 -8 pumpgen

evap practical,VAR WQ

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• A/7 )*/: (0(*,9 P-6-04( BX8. 6-=C

• 38 4>-0,( +0 (0.*/;9 /) - 898.(:


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• T*/: (0(*,9 P-6-04(7 >(-.

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– Fd] /) -0 +5(-6 @3'A

– !-?+:


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• L>( )+*8. .(*: -05 BL(0I+* e L4/05C +0 .>( 8(4/05 .(*:

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• 7(#4/!%G

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(0,+0( /;(*-.+0, PQ= BL,(0 2 L(0I+*C

• 305 =>-. 5/(8 8(4/05 .(*: /0

'HA *(;*(8(0.K

– Fd] /) - *(I(*8+P6( *()*+,(*-./*

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• >9?=

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(0(*,9 +8 (?;(08+I( -05 6/= ,*-5( (0(*,9 +8

*(-5+69 -I-+6-P6( – Examples….

– 3-


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!"# $%&

'()*+,(*-.+/0 2 3+* 4/05+.+/0+0,Amit Arora

Assistant Professor

Department of Mechanical Engineering NCU, Gurgaon

7%3#8.)) !"#$%& '()*+$,

-./&+0.&"*+$, )2)*.3)


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– L>(9 -*( (&% 6)-+.0 !+"% &6+-"%+3 *()*+,(*-.+/0 898.(:8 P4/S .>(9 -68/*(M


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• L>+*5 )695*/,(0C +8 ( 6+M


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• 30 -55+.+/0-6 P(0()+. *(8


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– A-9 $% /F

– A-.


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• D;/0 >(-. *(:/I-6 +0 .>( 4/05(08(*7

UHV I-;/


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• O0 (I-;/*-./*7 6+M(*( /)

>95*/,(0 ,-8

• If hydrogen is at 12 bar….

• J>-. =+66 P( .>( B;-*.+-6C ;*(88( (I-;/*-./* K

– O. =+66 *(5


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• '(5( B;-*.+-6C ;*(88/+4( /) 8-.(.(:;(*-.(

(I-;/*-./*

– U/*:-669 5(8+*(5 (I-;/*-./*

.(:;(*-.+4>4/**(8;/058 ./ .>( 8-.


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• D;/0 (I-;/*-.+/0 /) UHV I-;/ HZ ./ )/*: - :+?. .>( *()*+,(*-0.

• H95*/,(0 +8 4>/8(0 -8 .>( +0(*. ,-8

bcoz it is…

– U/0\4/**/8+I(

– O08/6.(8. ,-8 B-66/=8 )-8. (I-;/*-./0C

– "4/0/:+4-669 -I-+6-P6(• Other possible inert gases can be…

– 3+*7 H(6+


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• #+M*/ .>( +046+0(5 (I-;/*-./* 4/+6

• "I-;/*-.(5 UHV :+?(8 =+.> HZ ./ )/*:

4/65 :+?.+4>

5(84(058 +0 .>( (I-;/*-./* 5( =-*:(* HZ B,/+0, ./ .>(

(I-;/*-./*C +0 - 4/+8 4//6+0, +8 -+:(5 -. *(5(

+0.(*0-6 *()*+,(*-.+/0 6/-5

• F-0 9/< ,9 .>( *+8+0, HZ +8 =-*:K

– 3P8/*;.+/0 /) UHV I-;/( =(-E

8/6(-. =>+4>

6(-58 ./ .>( >(-.+0, /) +0(*. ,-8 BHZC

– J-*: HZ *+8(8 5


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• _(84(05+0, :+?.(-P8/*P(* B-. 6/4-.+/0\ZC I+- -

8;>(*+4-6 *(8(*I/+*

• 305 =(-E 3M( /.>(* 8+5( /) -P8/*P(* B-.

6/4-.+/0\VC

• J>-. =+66 P( .>( *(8+8

4/( ,-8

:+?.


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• J>-. =+66 P( .>( *(8+8

4/( ,-8

:+?. (?;(*+(04(8 >(-.+0, 5( 6+P(*-.+/0 /) >(-. /) -P8/*;.+/0

(

(I-;/*-./* )*/: .>( ./; /) -P8/*P(*

B6/4-.+/0\VC

– That’s how HZ

4/:;6(.(8 .>( 4946(


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• A.*/0, 3M(-.(5 +0 .>(

,(0(*-./* ./ 8(;-*-.( UHV I-;/

>-8 ./ P( 8(0. P-4E ./ .>( -P8/*P(*

• In conventional VARS, a ‘PRV’ is used

./ :-E( .>( =(-E 8/6( ,(0(*-./* B>+,> ;*(88( =>/6( 898.(: +8 4>-*,(5 ./

.>( 8-:( ;*(88


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• E)BB.+ 6)*6 =/*E8 /0 .>( ;*+04+;6(

of ‘thermo\syphon’

– O. +8 - 4-;+66-*9 . 8://.> =-6687

.>-. +8 +::(*8(5 P(6/= .>( 6+M( ,(0(*-./*

– D;/0 >(-.+0, +0 .>( ,(0(*-./*7 UHV8(;-*-.(8 )*/: .>( 3M*( =-.(* 86(:

– O0 .>( 8(;-*-./*7 86


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• T*/: 8(;-*-./*7 =(-E 3M( -P8/*P(* -05 ; ;-*.+-6 ;*(88( 4/05(08(* – T/* P*(I+.97 -0-698(* -05 *(4.+)+(* -*(

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6(-I( )*/: 8(;-*-./*

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@3'A – J>9 K

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,(0(*-./*7 (?.*- >(-. +8 *(M( P


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• 7(#4/!%

• L>/ .>( ./.-6 ;*(88*//( 898.(:

– D06+E( 4/0I(0.+/0-6 @3'A

• R( 898.(: 4-0 8.+66 P( P+) ;*(88


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• L>( *()*+,(*-.+/0 .-E(8 ;6-4( 5( (?;-08+/0 /) 6+M+,> B;-*.+-6C ;*(88(4/05(08(* ./ 6/= B;-*.+-6C ;*(88( (I-;/*-./*

– g/P /) "?;-08+/0 I-6I( +0 .>(

4/0I(0.+/0-6 @3'A +8 ;(*)/*:(5 P9

.>( +0(*. ,-8 BHZC )(5 ./ .>((I-;/*-./*

• T6/= /) .>( *()*+,(*-0. +8 5(

,*-I+.9 -05 P


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• _


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• @")%4&(8

• ]*(8(04( /) +0(*. ,-8 BHZC :( 6/= ;*(88-. :(-08 HZ :( 4/05(08(*

– U/ 0((5 ./ =/**9 -P/


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=$-+&"*+ )>? C4/6+&$4%8 @ =$-K/-+,$-"4 !(.2• 93F"(%"/+# &F+- '&(F+(%4&(". >9?=

• U/ *(M-0+4-6 ;(04( 0/ 6( 8-:( ;*(88( >(-. +0;

22-25 Vapour Absorption System

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