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THERMO-ACOUSTIC

REFRIGERATOR 

Project Title :

INDEPENDENT PROJECT

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  REFRIGERATIONRefrigeration is a process in which work isdone to move heat from one location toanother

Uses of Refrigeration :

• Ind!strial !ses

•  Air conditionin#

•Food stora#e and distri$!tion

• %edical applications

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  &'RRENT REFRIGERATION  %ET(O)*

   +APO'R &O%PRE**ION

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   +APO'R A,*ORPTION

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  )I*A)+ANTAGE*   +APO'R &O%PRE**ION

• Re-!ire &F&. (&F&. or other o/one harmin# refri#erants

• Increase #lo$al warmin# e0ect

• 1o!d2nois3

• T3pical e0icienc3 is 456778 of &arnot limit

• %ovin# parts and intricate desi#n

• Prone to $reakdown

 

 +APO'R A,*ORPTION

•Re-!ires lar#e heat so!rce

• &an9t !se electricit3 directl3

• Re-!ire &F&. (&F&. or other o/one harmin# refri#erants

• Increase #lo$al warmin# e0ect

• Ine0icient

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T(ER%OA&O'*TI&REFRIGERATOR

•  A thermo6aco!stic refri#erator TAR; is a refri#erator that!ses so!nd waves in order to provide the coolin#

•  In a TAR. the workin# <!id is a heli!m6ar#on mi=t!re. andthe compressor is replaced $3 a lo!dspeaker

>OR?ING PRIN&IP1E• Press!re variations in so!nd wave are accomplished $3

temperat!re chan#e d!e to particle oscillations in the #asFor a sin#le medi!m avera#e temperat!re at thatpartic!lar location does not chan#e >hen a secondmedi!m is present heat is e=chan#ed with it and ane=panded particle will take heat from it and compressedparticles will reject heat to the second medi!m

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*&(E%ATI& FOR TAR 

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  )I*A)+ANTAGE*

• The  downside of the TAR is that these failed to achievee0iciencies as hi#h as those of standard refri#erator !nits

•The coe0icient of performance of most advanced TAR is onl3 when compared to B64 of modern refri#erators

•   Another major pro$lem of TAR is that it is either f!ll3 on or o0

• It leaked an incredi$le amo!nt of so!nd that ca!ses ear pain$!t prod!ces onl3 a small temperat!re #radient

• These refri#erators were a$le to cool the air for a short amo!nt

of time $efore the cooled air started raisin# its temperat!re•  ver3 m!ch essen#erators have failed to achieve e0iciencies as

hi#h as those as standard refri#eration !nits

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  I%PRO+E%ENT*

• Ins!late the so!nd leaks $3 isolatin# the s3stem

• Replace the closed cap with a speaker to increase the e0icienc3

$3 co6#eneration• If $oth ends of a stack are connected to a heat e=chan#ers th!s

co!plin# the stack to a heat so!rce and sink. the transfer of heatwo!ld $e more e0icient

• 'se cond!ctive material for hot section of resonator

• >iden the resonator and !se a cone to red!ce the losses d!e torapid area chan#e

•  %ore practical and e0icient relia$le temperat!re sensors s!chas thermistors sho!ld $e !sed

• The composition of stack material ma3 also $e chan#ed to an3cond!ctin# materials like #old.silveror copper